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Old 09-01-2004, 12:30 PM   #1
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Vacuum Diagrams

Here's a typical one for computer controlled carb 3rd gens.

Perhaps others can post TBI/TPI types.
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Old 02-11-2005, 01:34 AM   #2
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If any one has a pic from an '85 TPI car I'd appreciate it as well as the Vehicle Emission Control Information label as my car doesn't have them. I tried to get them at my local Pontiac dealer but they said they couldn't get them anymore.
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Old 02-11-2005, 12:17 PM   #3
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My wife has a 84' Pontiac 6000 (amazing good shape body and all), but I had to replace valve cover gaskets and you talk about a NIGHTMARE. I had to track down a vacuum leak on it once and sometimes I felt like ripping the CCC out and putting a holley on, but eventually managed. Graphics like above definitely help out. Great Job 57!
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Old 04-20-2005, 11:31 PM   #4
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Typical of non-CCC export LG4:
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Old 06-02-2005, 06:40 PM   #5
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right now i have a vaccume leak or two. and i have removed a few vaccume using components and realy need a diagram like this for a 2.8L MPFI car. if anyone can help i would appreciate it.
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Old 06-02-2005, 09:05 PM   #6
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I'm assuming it's the 86 in your sig:
Click the image to open in full size.

Also, for anyone who is looking for vacuum diagrams for your 3rd gen, just go to link below. It's got all the vacuum diagrams for the different engines over the years. Here it is: http://www.autozone.com/servlet/UiBr...3d80163807.jsp
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Old 06-04-2005, 01:51 AM   #7
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i added the link to my sig. that way anyone who sees one of my posts will know where to go.
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Old 06-13-2005, 06:25 PM   #8
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Vacuum Tube

Do any of the diagrams tell you what size vacuum tubing needs to be used? Looking at mine it doesn't look like a standard size or would it really not matter?
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Old 06-13-2005, 07:01 PM   #9
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As long as it fits the ports.
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Old 06-15-2005, 03:10 PM   #10
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do you have any nice large shot's like that of the 91 3.1 setup?
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Old 03-26-2007, 06:48 AM   #11
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Re: Vacuum Diagrams

Click the image to open in full size.

I need to know (preferably a picture) in detail where the "TO HVAC" goes exactly. I'm thinking this might be why I can only get air to come out of the defroster vents no matter what I have it set on.
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Old 05-09-2007, 05:00 PM   #12
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Re: Vacuum Diagrams

I am in need of a vacuum diagram for a 1983 Chev Camaro V6 2.8L
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Old 06-07-2007, 04:51 PM   #13
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Re: Vacuum Diagrams

We desperatly need a good diagram of emmisions routing for a 1990 V8 TBI 5.0
I am new on this site and sure it's here somewhere, just cannot find it, if someone knows where to find it, please help! Thanx!
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Old 06-07-2007, 04:56 PM   #14
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Re: Vacuum Diagrams

Here are all of them listed
http://www.autozone.com/az/cds/en_us...rInfoPages.htm
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Old 09-21-2007, 11:42 PM   #15
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Re: Vacuum Diagrams

Friends I'm in need of a diagram of hose that go from the air tubes to the polition pump. I have a 1987 Camaro Iroc tnat has the 2 belt set up and I made it the one belt set up and I forgot how the hoses from the air tube go. So I need some help. Thanks.
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Old 07-14-2008, 12:18 PM   #16
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Re: Vacuum Diagrams

Guys I just bought a 91 Camaro Z28 Convertible, it had a 305 TBI. I did away with it and I installed a TPI system from a 1989 IROZ with a Mass Air Flow Sensor . I kept the original 1991 vent canister wich has a different diagam. My question is, should I set the vacuum lines up as the TPI 90-92 or should i find the vent canister for a 86-89 TPI?????
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Old 10-30-2008, 03:07 PM   #17
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Re: Vacuum Diagrams

ive got an 86 305, berlinetta. the vacuum diagram has lettering on the carburetor. how do i identify which of these letters represent the vacuum on my carb, i know of at least one that is above the other. the diagram just shows a left to right and such.
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Old 03-06-2009, 10:04 AM   #18
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Re: Vacuum Diagrams

I am repair my 1982 z28 that has a crossfire injection system. I can not find the EGV vacuum control solenoid anywhere. Does some body know where i can get one of these? Deal is telling me that they no longer make them and will be very hard to find.
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Old 03-09-2009, 01:24 PM   #19
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Re: Vacuum Diagrams

Do you a version of this diagram for cars without emissions equipment or more specific with the the airpump and stock air cleaner removed?

Also can anyone tell me the name of the sensor that is near the thermostat and has two vaccum lines attached to it?
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Old 03-30-2009, 08:48 PM   #20
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Re: Vacuum Diagrams

hi i need a emissions diagram for a 2.8 tbi cant find one any where. can only find a carb diagram. the auto zone link dosent work.
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Old 05-21-2009, 01:12 PM   #21
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Re: Vacuum Diagrams



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Old 05-23-2009, 07:38 AM   #22
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Re: Vacuum Diagrams

did you ever get this problem fixed? b/c I'm having the same problem. I know it was awhile back but if you could help me out I;d appreciate it.
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Old 07-11-2009, 08:54 AM   #23
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Re: Vacuum Diagrams

I need help. Can somebody please show me a vacumm diagram for a 1982 camaro with a V8 305 CROSSFIRE. Cross fire is the key.
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Old 07-12-2009, 01:47 PM   #24
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Re: Vacuum Diagrams

A vaccuum diagram for an '89 Formula (5.7) with TPI would be outstanding.
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Old 08-06-2009, 08:31 PM   #25
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Re: Vacuum Diagrams

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Old 09-03-2009, 06:49 PM   #26
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Re: Vacuum Diagrams

I recently bought my son a 1983 berlinetta with the 2.8. It ran like crap, so I started with the fuel filter, cap and rotor, plugs etc..... you know the typical stuff, and it didn't get any better. It's carberated and if I hold my hand over the carb it runs better..... any suggestions???
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Old 09-03-2009, 09:40 PM   #27
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Re: Vacuum Diagrams

hi im trying to figure out the vacuum diagram for a 91 z28 5.7 camaro im not sure if one of the 2 that are on here are it or nit. im trying to work on a friends car. when cold it dont wanna idel for crap but once warmd up my friend says it idles fine. i found a few vacum lines brok and missing. was looking for some help. if possible thnx. jason
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Old 10-22-2009, 09:02 PM   #28
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Re: Vacuum Diagrams

does nay one have a crossfire vacuum diagrahm
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Old 10-24-2009, 06:40 PM   #29
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Re: Vacuum Diagrams

Quote:
Originally Posted by five7kid View Post
Here's a typical one for computer controlled carb 3rd gens.

Perhaps others can post TBI/TPI types.
would a v6 carb look the same?
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Old 11-02-2009, 07:16 PM   #30
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Re: Vacuum Diagrams

none of the above posted links work today . autozone has blocked them for some reason , or maybe just too old . does anyone have current ones ???
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Old 11-02-2009, 08:43 PM   #31
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Re: Vacuum Diagrams

Quote:
Originally Posted by UNCLE TOM View Post
none of the above posted links work today . autozone has blocked them for some reason , or maybe just too old . does anyone have current ones ???
It appears you must have a (free) registered account with AutoZone in order to access that information.

Going here:
http://www.autozone.com/autozone/rep...nfoLanding.jsp

Then here:
http://www.autozone.com/autozone/myz...ipBenefits.jsp

Once you have an account, you can then access the vacuum diagrams under Emission Controls and then Vacuum Diagrams
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Old 12-20-2009, 09:56 PM   #32
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Re: TPI Vacuum Diagrams

Here are 2 different vacuum diagrams for the TPI system. Just follow the link. http://www.thirdgen.org/techboard/po...48-post12.html
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Old 01-04-2010, 10:35 AM   #33
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ThirdGen VACUUM DIAGRAMS INSIDE!!!

Not sure where to post this MODERATORS.. but i figured since it look me like 2-3 days to find these diagrams it should be made a sticky.. as it seams like its important yet extreamly useful info to alot of people..

Here are 2 zip files that have EVERY vacuum diagram i could find for third gens..

if there are anymore please post as i cant find anymore..
Attached Files
File Type: zip 82-84 diagrams.zip (831.1 KB, 419 views)
File Type: zip 85-92 diagrams.zip (1,009.7 KB, 941 views)
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Old 02-15-2010, 07:56 PM   #34
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Re: ThirdGen VACUUM DIAGRAMS INSIDE!!!

you are my hero
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Old 02-15-2010, 10:50 PM   #35
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Re: ThirdGen VACUUM DIAGRAMS INSIDE!!!

Quote:
Originally Posted by lopezisgod View Post
Not sure where to post this MODERATORS.. but i figured since it look me like 2-3 days to find these diagrams it should be made a sticky.. as it seams like its important yet extreamly useful info to alot of people..

Here are 2 zip files that have EVERY vacuum diagram i could find for third gens..

if there are anymore please post as i cant find anymore..
lopezisgod, where did you get these diagrams at? I ask because there is one diagram which is label "85-86 5.0L TPI", well it is completely wrong, false to the max. My 86 TPI vapor canistor is on the driverside, not the passenger side. On the passengerside is the battery.
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Old 02-15-2010, 10:51 PM   #36
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Re: Vacuum Diagrams

I must admitt though, good lookin.
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Old 03-02-2010, 09:36 PM   #37
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Re: Vacuum Diagrams

Quote:
Originally Posted by JT View Post
It appears you must have a (free) registered account with AutoZone in order to access that information.

Going here:
http://www.autozone.com/autozone/rep...nfoLanding.jsp

Then here:
http://www.autozone.com/autozone/myz...ipBenefits.jsp

Once you have an account, you can then access the vacuum diagrams under Emission Controls and then Vacuum Diagrams
This Infomation was very helpful Thank You.
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Old 03-27-2010, 10:40 PM   #38
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Re: Vacuum Diagrams

Ill be figuring out sizes for the following diagram. Since I busted my EGR vacuum hoses, might as well do the rest too.

Fig. 21: 1988-1992 5.0L Throttle Body Injection; auto trans.

EDIT:

Lengths will vary depending on how you route. Also I would go to figure that sizes are the same for each part, just not the lengths.

Map Sensor- 1/4"
EGR Solenoid- 3/16"
EGR Valve- 3/16"
PCV- 3/8"
Canister Top- 1/4"
Canister Bottom- 5/16"
-Y Connector- 5/16" Main, Split to 3/16" Secondary
-Canister Bottom Y (Small Hose)- 3/16"
-Canister Bottom Y (Large Hose)- 5/16"
Brake Booster- 3/8"

3/16" = 3ft = 4mm
1/4" = 5ft = 6mm
5/16" = 1ft = 8mm
3/8" = 3ft = 10mm

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Last edited by I H8 WWD; 03-28-2010 at 07:20 PM. Reason: Added sizes and lengths
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Old 04-19-2011, 11:12 AM   #39
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Re: ThirdGen VACUUM DIAGRAMS INSIDE!!!

Thanks for the diagrams, but do you have access to a picture of the EGR solenoid? I have never had to replace this thing and I most likely need to. 271, 000 miles, no replace. Have replaced the EGR valve every 4 years. Anyway, anything you can do will be appreciated. I am the original owner of an 89 Formula with 5.7 tpi. I work on myself when I can.

Thanks,

Barbara
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Old 08-07-2011, 07:58 AM   #40
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Re: Vacuum Diagrams

Looking for a vacuum hose routing diagram for 89 IROC 5.7 TPI.
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Old 08-07-2011, 08:58 AM   #41
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Re: Vacuum Diagrams

Quote:
Originally Posted by joeleugers View Post
Looking for a vacuum hose routing diagram for 89 IROC 5.7 TPI.
follow this link to find your vac. Line diagram. http://www.chevythunder.com/fuel%20i...um%20lines.htm
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Old 08-07-2011, 11:28 AM   #42
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Re: Vacuum Diagrams

any one know where i can get a vacuum manometer to balance my crossfire tbis
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Old 08-07-2011, 09:05 PM   #43
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Re: Vacuum Diagrams

Quote:
Originally Posted by five7kid View Post
Here's a typical one for computer controlled carb 3rd gens.

Perhaps others can post TBI/TPI types.

this is awesome, hopefully itll help me understand how mine goes back together LOL ive deleted air and egr
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Old 08-08-2011, 11:57 AM   #44
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Re: Vacuum Diagrams

These diagrams are awesome for reference data.

Does it matter which end of the lines hook up to the EGR solenoid? I have a code 32 EGR code.

Thanks!
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Old 08-08-2011, 01:47 PM   #45
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Re: Vacuum Diagrams

When I get home, ill send u a troubleshooting guide for your TC. 32.
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Old 08-13-2011, 04:12 PM   #46
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Re: Vacuum Diagrams

Hey Chevy86...

I figured out what the problem was. I guess for some reason there is NO vacuum suction from the hose under my throttle body. I used a different vacuum source and hooked up my EGR solenoid from the 95 Caddy 4.9L engine and now there is NO SES light!!!

I wanted to ask you a different Q though....

Have you ever noticed your volt gauge drop below the 13 when you have the AC on and are sitting at a traffic light?

I replaced the belt with a brand new Dayco and have all the stock items installed.

Any issue with the battery going to be Dis-chaged when the needle goes below 13 at idle? It doesnt do it when I am cruising down the road.

I appreciate any help or advice.
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Old 08-13-2011, 05:57 PM   #47
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Re: Vacuum Diagrams

Quote:
Originally Posted by DJK90IrocZ View Post
Hey Chevy86...

I figured out what the problem was. I guess for some reason there is NO vacuum suction from the hose under my throttle body. I used a different vacuum source and hooked up my EGR solenoid from the 95 Caddy 4.9L engine and now there is NO SES light!!!

I wanted to ask you a different Q though....

Have you ever noticed your volt gauge drop below the 13 when you have the AC on and are sitting at a traffic light?

I replaced the belt with a brand new Dayco and have all the stock items installed.

Any issue with the battery going to be Dis-chaged when the needle goes below 13 at idle? It doesnt do it when I am cruising down the road.

I appreciate any help or advice.
Ohh Dang!!! I would use explicit words but the thread must stay PG-13. I completely forgot to help you out man. My apologies. Good for you on locating the problem. As for the voltage gauge, yes. I dont have a/c but I do have a 800 watt bass sound system. I have a 3 month old reman alternator. Either at a dead stop or while driving, my voltage drops down to about 8 volts (according to the volt gauge). But when I have the system off, my gauge reads 12-13 volts. Your below 13 volts issue will and should not be an issue. The only time this will affect is during a extremely cold winter because the "cold cranking amps" drops. But dont worry too much. If it bothers you that much, park it, turn on a/c to full blast. Once the voltage drops below 13 on the gauge, test the batteries voltage with a voltmeter. Note the voltage reading on the multi/voltmeter. Then go back inside and note the voltage on the gauge. The difference that you will see is pretty much common with our aging cars. This is because of the wiring. As time goes by, the current has a tougher time traveling down the wire do to contamination and corrosion. the down fall is the drop in voltage because the current has less and less area to travel on/in. So the there you have it. If the Camaro ever dies on you because the voltage drops too much, then you should be concerned. The best battery and highly recommended for our 3rd gens is the Optima Battery. Its expensive but it is the most reliable IMO.
Click the image to open in full size.

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Old 08-15-2011, 02:22 PM   #48
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Re: Vacuum Diagrams

Quote:
Originally Posted by Chevy86 IROC-Z View Post
follow this link to find your vac. Line diagram. http://www.chevythunder.com/fuel%20i...um%20lines.htm
Thanks for the help!
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Old 08-26-2011, 12:21 AM   #49
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Re: Vacuum Diagrams

Just FYI, the EGR solenoid valves I have seen must be connected correctly. The vacuum connector centered on the solenoid body must be connected to the vacuum source and the other line must go to the EGR valve. This is because when the solenoid is not energized, the EGR side is vented to air through a small orifice and filter so that the valve will close quickly. If you get these lines wrong, you will have a vacuum leak when not energized, and the EGR valve will stay open long after it is supposed to close!

KTF
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Old 08-26-2011, 08:47 AM   #50
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Re: Vacuum Diagrams

hey do you know where i can get an egr solenoid for a 1983 crossfire firebird
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