Search



Go Back   Third Generation F-Body Message Boards > Tech Boards > TBI
Register Forgot Password?

TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

Welcome to ThirdGen.org!
Welcome to ThirdGen.org.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join the ThirdGen.org community today!


Reply
 
Thread Tools Search this Thread
Old 11-12-2011, 04:03 PM   #1
Junior Member
 
Join Date: Apr 2011
Location: Derry, Pennsylvania
Posts: 79
Car: 1990 Camaro RS
Engine: 305 TBI

Classifieds Rating: (0)
Car shakes while stopped in Drive.

After I drive my car for around 7 miles when i push the gas it seems like its misfiring and cuts out. Then when I stop while in drive the battery gauge drops while the car idle bogs and shakes the car. Don't know what to do. People on here say could be TPS but i dont know how to check it. Just wondering if anyone could help. Thanks!
ZWis212 is offline vBGarage Page   Reply With Quote
Old 11-12-2011, 07:07 PM   #2
Supreme Member
 
one92rs's Avatar
 
Join Date: Jan 2009
Location: league city
Posts: 2,920
Car: 92 camaro rs-project car
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.23

Classifieds Rating: (5)
Re: Car shakes while stopped in Drive.

the charge gauge can drop if rpm's drop too low. and the problem can be caused by a host of things. this will be a process of elimination.
__________________
one92rs is offline vBGarage Page   Reply With Quote
Old 11-12-2011, 07:40 PM   #3
Member
 
mitchberry's Avatar
 
Join Date: Jul 2010
Location: http://redacesmoto.com
Posts: 358
Car: 99 SS G2
Engine: 389 rwhp ls1 n/a
Transmission: viper spec t56

Classifieds Rating: (1)
Re: Car shakes while stopped in Drive.

are your injectors dripping???

lol....

my car was doing the same exact thing, i changed the tps, it got worse (or at minimum, not much better), then i changed this module..... dont know what it's called, i just happened to find one on a 95 z28 LT1 (their the same part if you take the grommet off of it) and swapped it out...

There's a vacuum line that runs from the rear passenger side of your tbi, to this black box about 4 inches long, by 2 inches deep, 1.5 tall, and has a green plug that goes into the bottom of it.. vacuum plugs in behind that.

it's mounted just below the weather stripping on the passenger side on your firewall.. it's not hard to get to and is fairly obvious if you're looking in that direction.

on the LT1, it actually plugs right into the top of the intake near the throttle body...
http://www.vetteworksonline.com/LT1_...version/18.jpg
(the obvious black box on top of the pretty LT-4 red intake)

obviously, the one for your car is mounted on a bracket though where i explained previously.

i really don't know what it's called, but... i changed it, and it runs a lot better except for the leaky injectors and the issues they cause.. it's obviously a sensor though.

it made the tps function properly.

i really wish i had a parts diagram for these cars.

it may be the mass airflow sensor... i really don't know. it would make sense if it were..
mitchberry is offline vBGarage Page   Reply With Quote
Old 11-12-2011, 10:39 PM   #4
Junior Member
 
Join Date: Apr 2011
Location: Derry, Pennsylvania
Posts: 79
Car: 1990 Camaro RS
Engine: 305 TBI

Classifieds Rating: (0)
Re: Car shakes while stopped in Drive.

I was definitely looking at the tps and going to replace that but ill have to check out this part.

Im guessing the part you were talking about is the box to the upper left of my air filter with the green plug sticking out of it. Do you just pull out the vacuum lines from it or what? Im kind of a noob at all this stuff.

Click the image to open in full size.

Last edited by ZWis212; 11-12-2011 at 10:43 PM.
ZWis212 is offline vBGarage Page   Reply With Quote
Old 11-13-2011, 07:16 AM   #5
Supreme Member
 
Join Date: Jan 2011
Posts: 1,559

Classifieds Rating: (0)
Re: Car shakes while stopped in Drive.

You need to start w/ a good tune up, plugs, wires, cap, rotor, & filters. If you can find a cap & rotor w/ brass terminals, use that instead of the ones w/ alluiminum terminals.
ex-x-fire is offline vBGarage Page   Reply With Quote
Old 11-13-2011, 02:47 PM   #6
Member
 
mitchberry's Avatar
 
Join Date: Jul 2010
Location: http://redacesmoto.com
Posts: 358
Car: 99 SS G2
Engine: 389 rwhp ls1 n/a
Transmission: viper spec t56

Classifieds Rating: (1)
Re: Car shakes while stopped in Drive.

yeaaaaaaaahhhh that's the one!!! (though mine looked a little different on my 91) sorry for the late reply... and i think i have a correction. apparently there's not a mass airflow sensor on these, there's a MAP sensor though, and that may or may not be what that part is.. lol.. i haven't put any effort into researching what the part is.. sorry

and yeah, basically, unplug the hose, unplug the wires, remove the two bolts, and replace it the same way it came off. it worked wonders on my car though it still doesn't run perfect because of the injectors, which one92rs was kind enough to send me an awesome link for...

i had been researching them for a while, and this link is the cheapest for damn sure..

http://www.injectorwhse.com/servlet/...RO-5.0L/Detail

and of course ex-x is also right. but i have a feeling that the little box is a good start and something that most people overlook. i only found it by chance because i noticed the lt1 parts car we acquired also had one, so decided to replace it as a fail safe.
mitchberry is offline vBGarage Page   Reply With Quote
Old 11-13-2011, 02:48 PM   #7
Member
 
mitchberry's Avatar
 
Join Date: Jul 2010
Location: http://redacesmoto.com
Posts: 358
Car: 99 SS G2
Engine: 389 rwhp ls1 n/a
Transmission: viper spec t56

Classifieds Rating: (1)
Re: Car shakes while stopped in Drive.

AH! YEAH! MAP sensor...

http://www.partstrain.com/store/deta...ps10075191mase
mitchberry is offline vBGarage Page   Reply With Quote
Old 11-13-2011, 04:29 PM   #8
Junior Member
 
Join Date: Apr 2011
Location: Derry, Pennsylvania
Posts: 79
Car: 1990 Camaro RS
Engine: 305 TBI

Classifieds Rating: (0)
Re: Car shakes while stopped in Drive.

When ever i get some money I am going to get a full tune up and buy the MAP sensor and possible the TPS sensor. I looked and the MAP sensor doesnt look hard to replace. If i cant figure anything out ill end up going with the fuel injectors. I drive to school everyday which is only 5 miles away so i can make it there and back no problem.
ZWis212 is offline vBGarage Page   Reply With Quote
Old 11-13-2011, 04:37 PM   #9
Member
 
mitchberry's Avatar
 
Join Date: Jul 2010
Location: http://redacesmoto.com
Posts: 358
Car: 99 SS G2
Engine: 389 rwhp ls1 n/a
Transmission: viper spec t56

Classifieds Rating: (1)
Re: Car shakes while stopped in Drive.

yeah, the map sensor is about a 5 second install and only needs a phillips head screwdriver.

as for the injectors, if you take the air cleaner off of it, while the car is running at idle, there should be a slight spray coming out of them, no dripping. if it drips their bad. if you give it throttle they should spray an even stream of atomized gas.. if not, their bad. pretty much the gist of it.
mitchberry is offline vBGarage Page   Reply With Quote
Old 11-13-2011, 08:32 PM   #10
Member
 
Join Date: Jun 2002
Location: Hockessin, Delaware
Posts: 491
Car: Red 91 RS Camaro
Engine: LO3 with Comp Cam
Transmission: 700R4
Axle/Gears: 4th gen rear

Classifieds Rating: (0)

Send a message via AIM to iggy1991
Re: Car shakes while stopped in Drive.

you need to diagnose the problem not just throw parts at it hoping to find what it may be and get lucky. Could be fouled or worn our spark plugs and ur talking about sensors that can be tested with a volt/ohm meter to see if they are good or not. Is it only acting up after it warms up? Does it misfire right after you start it up and drive?
iggy1991 is offline vBGarage Page   Reply With Quote
Old 11-13-2011, 09:48 PM   #11
Junior Member
 
Join Date: Apr 2011
Location: Derry, Pennsylvania
Posts: 79
Car: 1990 Camaro RS
Engine: 305 TBI

Classifieds Rating: (0)
Re: Car shakes while stopped in Drive.

Nothing happens until I drive it around 5-10 miles and it starts to warm up. Then it seems like its misfiring and cutting out.
ZWis212 is offline vBGarage Page   Reply With Quote
Old 11-14-2011, 06:04 PM   #12
Supreme Member
 
one92rs's Avatar
 
Join Date: Jan 2009
Location: league city
Posts: 2,920
Car: 92 camaro rs-project car
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.23

Classifieds Rating: (5)
Re: Car shakes while stopped in Drive.

you need to test the egr valve. also look at vacuum lines to see if they are cracked.
__________________
one92rs is offline vBGarage Page   Reply With Quote
Old 11-14-2011, 06:46 PM   #13
Member
 
mitchberry's Avatar
 
Join Date: Jul 2010
Location: http://redacesmoto.com
Posts: 358
Car: 99 SS G2
Engine: 389 rwhp ls1 n/a
Transmission: viper spec t56

Classifieds Rating: (1)
Re: Car shakes while stopped in Drive.

yaaaaay vacuum lines.. im glad we've largely moved beyond that technology these days. i had a porsche 928 that i bought and kept for about 2 weeks and sold specifically because EVERYTHING on that stupid car was run by vacuum.

EVERYTHING... vacuum blinkers, vacuum disk brakes, vacuum seat motors, vacuum door locks, vacuum engine crap, vacuum transmission, vacuum sunroof, vacuum windshield wipers, vacuum flippy lights, vacuum washer fluid,

ok well maybe not ............... but... honestly, about HALF of that -is true-

the thing ran like hell and sounded like a hoover with all those vacuum leaks and nothing worked on the damn thing, so i sold it instead of trying to track all that crap down...

so, then i end up with another vacuum happy car...

<---

did they ever make a tool to test for vacuum leaks? the "stick your head real close to scalding hot motor and hold your jaw just right like you're looking for a lost contact and listen for a loud sucking sound that sounds different from your intake, lifters, exhaust, belts, worn bearings, creeks rattles and EVERYTHING else happening under the hood"

OR THE

"spray some crap on it and see if it bubbles or runs differently" methods REALLY suck in a practical environment.

i'd hope that technology has gotten us past that
mitchberry is offline vBGarage Page   Reply With Quote
Old 11-14-2011, 06:50 PM   #14
Supreme Member
 
Join Date: Jan 2011
Posts: 1,559

Classifieds Rating: (0)
Re: Car shakes while stopped in Drive.

a smoke machine will help out in finding vacuum, evap, exhaust, & even oil leaks.
ex-x-fire is offline vBGarage Page   Reply With Quote
Old 11-15-2011, 06:54 PM   #15
Senior Member
 
RS-Chevy-SS's Avatar
 
Join Date: Oct 2006
Location: California
Posts: 731
Car: 1989 Chevy Camaro RS
Engine: L30 TBI 5.0L Vortec
Transmission: 700R4
Axle/Gears: Stock

Classifieds Rating: (0)
Re: Car shakes while stopped in Drive.

As stated previously do a tune of, Take th TB off as well and check gasket, they tend to get sucked up.
RS-Chevy-SS is offline vBGarage Page   Reply With Quote
Old 11-16-2011, 07:17 PM   #16
Supreme Member
 
zenish's Avatar
 
Join Date: Dec 2000
Location: stallings,n.c.
Posts: 1,191
Car: 1989 camaro rs convertable
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 7.5"3.42 gears forth gen 2000 camar

Classifieds Rating: (0)

Re: Car shakes while stopped in Drive.

another thing to check is to put a scan tool on it and make sure that the coolant temp sender is working right.if the computer thinks the engine is still cold the mixture will be off.there are two.one for the computer and one for the guage.
zenish is offline vBGarage Page   Reply With Quote
Old 11-16-2011, 09:02 PM   #17
Junior Member
 
Join Date: Apr 2011
Location: Derry, Pennsylvania
Posts: 79
Car: 1990 Camaro RS
Engine: 305 TBI

Classifieds Rating: (0)
Re: Car shakes while stopped in Drive.

Thanks for all the help but i ended up getting mad and taking it to the shop. Got it back today and everthing runs perfect (knock on wood). He said the Distributor cap and rotor was all corroded and a mess so he replaced those. I drove around a lot tonight because i was so happy i could drive it problem free. There is nothing in this world like a cruise in the 3rd Gen Camaro. Thanks again for all the comments its really appreciated!
ZWis212 is offline vBGarage Page   Reply With Quote
Old 11-16-2011, 09:02 PM
ThirdGen
1992 Camaro




Paid Advertisement


Reply

Go Back   Third Generation F-Body Message Boards > Tech Boards > TBI

Tags
305, car, cars, cut, drive, drop, rattles, rpms, shakes, shakingwhilestopped, stopped, stopping, stops, stumbles, tbi
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92


All times are GMT -5. The time now is 06:25 AM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
All content copyright 1997 - 2014 ThirdGen.org. All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of ThirdGen.org's Administrators.

Emails & Contact Details