Search



Go Back   Third Generation F-Body Message Boards > Tech Boards > Tech / General Engine
Register Forgot Password?

Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
Sponsored by Weld Racing
Click Here

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 05-21-2003, 07:35 PM   #1
Senior Member
 
Join Date: Jun 2000
Location: Fairfax, VA
Posts: 768
Car: 1991 z-28
Engine: zz4 350
Transmission: t-56

Classifieds Rating: (0)

Send a message via AIM to 1991 Z-28
New ZZ4 and Stealth Ram , Running like #$%^ please help

We set the timing at about 8 degrees. The fuel pressure is set at 44psi. This thing is pulling 12 inchs of vaccumn at idle and even my own 388 pulls 16 inchs at idle. I change the plugs on it switched out the ignition coil. I've reset the valves incase they were not set properly even though its a crate motor and you should have to. I played around with the PROM, and when i try to give it more fuel in the VE tables, it just runs terrible. The plug readings are jet white, which means its running way too lean, but it doesn't like to run any richer than it is now. The car is extremely jerky fuel if added to it in the PROM. What other suggestions to run on the checklist to get this thing going properly before nationals?

cam is 208/221 LSA 112
Attached Images
File Type: jpg zshow1.jpg (61.1 KB, 260 views)
1991 Z-28 is offline vBGarage Page   Reply With Quote
Old 05-21-2003, 09:26 PM   #2
Senior Member
 
Join Date: Jun 2001
Location: Dale City, VA
Posts: 1,668
Car: 91 GTA and 85 IROC
Engine: 355
Transmission: gear jammer
Axle/Gears: 4.11

Classifieds Rating: (1)
Send a message via AIM to Free Bird
Try adding a $hit load of fuel to the initial shot. Some refer to it as the "pump shot". It helped my lean condition a lot and made it easier to drive around town. Try to do a search on the prom boards. They're getting pretty good at tuning these HSR motors.
__________________
No force, no drugs 355ci. gear jammer
11.69 @ 116.87
7.4X @ 91.X
Free Bird is offline vBGarage Page   Reply With Quote
Old 05-21-2003, 09:28 PM   #3
Senior Member
 
Join Date: Jun 2001
Location: Dale City, VA
Posts: 1,668
Car: 91 GTA and 85 IROC
Engine: 355
Transmission: gear jammer
Axle/Gears: 4.11

Classifieds Rating: (1)
Send a message via AIM to Free Bird
Is that Jeremy's (Poorboy8) car in the bottom right?
Free Bird is offline vBGarage Page   Reply With Quote
Old 05-21-2003, 09:47 PM   #4
Moderator
 
Join Date: Sep 2000
Location: Annapolis Maryland
Posts: 1,021
Car: To many to list

Classifieds Rating: (52)

Quote:
Originally posted by Free Bird
Is that Jeremy's (Poorboy8) car in the bottom right?
Yes it is.That was last year at a meet we had in So. MD.Did he get any paint on that thing yet?
Steve86TA is offline vBGarage Page   Reply With Quote
Old 05-21-2003, 10:03 PM   #5
Supreme Member
 
Matt87GTA's Avatar
 
Join Date: Mar 2001
Location: The State of Hockey
Posts: 2,044
Car: 1987 Trans Am GTA
Engine: Miniram'd 383, 24X LS1 PCM
Transmission: TH700R4, 3200 stall
Axle/Gears: 9", 4.33:1

Classifieds Rating: (0)

Is it going into closed loop? Got any scantool data (BLMs, knock counts, etc)?
__________________
1987 GTA / Miniram'd 383/ 24X LS1 PCM / TH700R4 3200RPM stall / 9" w/4.33s
Far from stock, far from done.... 11.49 @ 121 MPH
Link to the GTA
Matt87GTA is offline vBGarage Page   Reply With Quote
Old 05-21-2003, 10:57 PM   #6
Senior Member
 
Join Date: Jun 2001
Location: 600 yds out
Posts: 1,520
Car: Bee-Bowdy
Engine: blowd tree-fity
Transmission: sebin hunnerd
Axle/Gears: fo-tins

Classifieds Rating: (1)
Re: New ZZ4 and Stealth Ram , Running like #$%^ please help

Quote:
Originally posted by 1991 Z-28
We set the timing at about 8 degrees. The fuel pressure is set at 44psi. This thing is pulling 12 inchs of vaccumn at idle and even my own 388 pulls 16 inchs at idle.

...and when i try to give it more fuel in the VE tables, it just runs terrible...
Uhhh, it idles with 12"Hg and you want to put MORE fuel in it?!? You're going the wrong way. You need to lean out the VE table in the idle area. I'd also crank the timing up in the same area. That should get you driving so you can tune it.
__________________
'96 Bronco: 302, 5-spd, 4wd, 32" tires
'84 Impala: 350 with Dart heads 200cc IR 72cc CC, Ferrea valves, 9.3:1 compression zero clearanced, Comp 276HR cam, 1.52 Pro Mag roller rockers, ported Torker II + 1" spacer, DIY 4bbl TBI, 95#/hr injectors, single GT45 turbo, boxed control arms holding a GM 8.5" G80 with 4.10's
V8Astro Captain is offline vBGarage Page   Reply With Quote
Old 05-22-2003, 05:08 PM   #7
Senior Member
 
Join Date: Jun 2001
Location: Maryland
Posts: 897
Car: 1993 Toyota Supra
Engine: Inline 6
Transmission: 6 Speed
Axle/Gears: 3.13

Classifieds Rating: (1)

Send a message via AIM to Der91Z
The car is running super lean, the plugs are jet white. There is alot of timing in it, so much that i was afraid it might hurt it because of how lean the car was running, so i backed it down a little. I'm going to check the firing order on it when the weather breaks, but i would assume thirdgen resource got that right, I mean 1991 Z-28 did pay a fair chunk of change for this job. then again, we all know what happens with assumptions.
Der91Z is offline vBGarage Page   Reply With Quote
Old 05-22-2003, 05:31 PM   #8
Senior Member
 
Join Date: Jan 2002
Location: Kona, Hawaii / Redlands, CA
Posts: 1,341
Car: 91' RS
Engine: Built 355
Transmission: Probuilt 700r4

Classifieds Rating: (0)

Hmm....

I really don't know anything about tuning cars with proms and all but... with these Stealth Rams and such can't you tune the car with a lap top in the car? If so then couldn't you set the base timing to 10 or 12 degrees, then alter the fuel mixture to get the most vacuum?

I would also get an air/fuel gauge....it always helps me out. If the plugs are white, then yes it's lean....but are the plugs looking like this when you let it idle for like 5 mins then pull them out? The a/f gauge would really help you out cause all you would have to do is set the a/f mix to 14 or so on the gauge and you are set, comp. controlled cars ecm's will usually make up the rest of the driving range...well stock ones anyway....shoot I better get off this post before I say something retarded.
330hp_91RS is offline vBGarage Page   Reply With Quote
Old 05-22-2003, 05:32 PM   #9
Senior Member
 
Join Date: Jan 2002
Location: Kona, Hawaii / Redlands, CA
Posts: 1,341
Car: 91' RS
Engine: Built 355
Transmission: Probuilt 700r4

Classifieds Rating: (0)

Oh yeah...

What do you mean..." The car doesn't LIKE the fuel mixture to be any richer than it is now"

Clarify....
330hp_91RS is offline vBGarage Page   Reply With Quote
Old 05-22-2003, 09:33 PM   #10
Senior Member
 
Join Date: Jun 2001
Location: Maryland
Posts: 897
Car: 1993 Toyota Supra
Engine: Inline 6
Transmission: 6 Speed
Axle/Gears: 3.13

Classifieds Rating: (1)

Send a message via AIM to Der91Z
When more fuel is added in the VE tables, the car runs really bad and is extremely jerky. It almost stalls at part throttle and when you crack the throttle it just flat out dies out.
Der91Z is offline vBGarage Page   Reply With Quote
Old 05-22-2003, 10:00 PM   #11
Senior Member
 
Join Date: Jan 2002
Location: Kona, Hawaii / Redlands, CA
Posts: 1,341
Car: 91' RS
Engine: Built 355
Transmission: Probuilt 700r4

Classifieds Rating: (0)

Geeezz.

Quote:
Originally posted by derfrank
When more fuel is added in the VE tables, the car runs really bad and is extremely jerky. It almost stalls at part throttle and when you crack the throttle it just flat out dies out.
That's really strange. What kind of air intake/filter assembly is on it?
330hp_91RS is offline vBGarage Page   Reply With Quote
Old 05-22-2003, 10:28 PM   #12
Senior Member
 
Join Date: Jun 2001
Location: Maryland
Posts: 897
Car: 1993 Toyota Supra
Engine: Inline 6
Transmission: 6 Speed
Axle/Gears: 3.13

Classifieds Rating: (1)

Send a message via AIM to Der91Z
Same as factory, tpi boot with y snorkel with two paper filters.
Der91Z is offline vBGarage Page   Reply With Quote
Old 05-23-2003, 12:00 AM   #13
Senior Member
 
Join Date: Jan 2002
Location: Kona, Hawaii / Redlands, CA
Posts: 1,341
Car: 91' RS
Engine: Built 355
Transmission: Probuilt 700r4

Classifieds Rating: (0)

hmmm....

Quote:
Originally posted by derfrank
Same as factory, tpi boot with y snorkel with two paper filters.
i know it's a long shot, but sounds to me like you r are choking the motor, then when you richen the mixture, it richens even more rapidly because you are already at a standpoint with the amount of air entering the engine. Just a thought, but why in the heck do you have a Stealth Ram with factory intake? I don't get it. At least some K&n's and maybe a ram air setup later.
330hp_91RS is offline vBGarage Page   Reply With Quote
Old 05-23-2003, 03:05 AM   #14
Supreme Member
 
Join Date: Mar 2001
Location: Miami & Coral Springs
Posts: 2,564
Car: Sometimes. Usually.
Engine: 2.0 Liter @ 250 hp
Transmission: Synchro soup
Axle/Gears: 3.91278172

Classifieds Rating: (0)

Send a message via AIM to Kingtal0n
vacuum leaks.

that cam should pull more than that at idle. whats the idle speed? my 218/224 Pulls 15" at 800 Rpms. My 234/244 pulls 10" at 800 Rpms. if your only pulling 12" at 800 rpms somthing is wrong. it would explain the super lean looking plugs, and the jerkiness.

are you using a MAF? vacuum leaks play hell with mafs because the computer doesnt see the extra air and wants to pull fuel out.
Kingtal0n is offline vBGarage Page   Reply With Quote
Old 05-23-2003, 09:47 AM   #15
Senior Member
 
Join Date: Jun 2001
Location: Maryland
Posts: 897
Car: 1993 Toyota Supra
Engine: Inline 6
Transmission: 6 Speed
Axle/Gears: 3.13

Classifieds Rating: (1)

Send a message via AIM to Der91Z
Not a single vaccumn leak, and it is Speed Density so no MAF sensor. I'm leaning towards the firing order being off since thats the one thing i haven't checked yet.
Der91Z is offline vBGarage Page   Reply With Quote
Old 05-23-2003, 09:47 AM
ThirdGen
1992 Camaro




Paid Advertisement


Reply

Go Back   Third Generation F-Body Message Boards > Tech Boards > Tech / General Engine
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 02:14 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