Search



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

Carburetors Carb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it 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 03-13-2005, 01:25 AM   #1
Senior Member
 
Join Date: Nov 2001
Posts: 532
Car: 88 IROC-Z
Engine: 383 Stroker
Transmission: TH350

Classifieds Rating: (0)
pinging acceleration, rough running

Recently I have had a problem with pinging on acceleration when the engine is cool. I have not changed the timing in a long time and it never used to do this.

Also, as long as I drive moderately, the car runs smooth. If I get on it, it accelerates good at first and then will ping & be really rough and choppy, even after slowing down and parking at idle.

My plans are to:

change the fuel filter, check the exhaust for holes.

the plugs are good

Anyone had this problem and what did you do to fix it? Could it have anything to do with my carb tuning? The fuel pump is original and I have a mallory 5 port regulator...both have always been good in the past.

BTW, I posted this here because I didnt get much response in tech/general and because I have a carb.


Much Thanks.
rocky383 is offline vBGarage Page   Reply With Quote
Old 03-14-2005, 12:06 PM   #2
Moderator
 
five7kid's Avatar
 
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 42,096
Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 10B-3.73/9"-3.89

Classifieds Rating: (14)

Sounds like you're running it out of fuel under load. Fuel filter is a good place to start.
five7kid is offline vBGarage Page   Reply With Quote
Old 03-26-2005, 02:08 PM   #3
Senior Member
 
Join Date: Nov 2001
Posts: 532
Car: 88 IROC-Z
Engine: 383 Stroker
Transmission: TH350

Classifieds Rating: (0)
I replaced the fuel filter and plugs for the hell of it. Still pinging and bogging down on acceleration. I hear a popping noise on the drivers side in the engine bay too. Any ideas what the popping noise could be? Could the headers or exhaust be clogged up?
rocky383 is offline vBGarage Page   Reply With Quote
Old 03-26-2005, 03:21 PM   #4
Member
 
Join Date: Jul 1999
Location: Tucson, AZ
Posts: 272
Car: '82 Camaro
Engine: 383
Transmission: TH-350

Classifieds Rating: (0)
Send a message via ICQ to Bunker82 Send a message via AIM to Bunker82
I'd start by inspecting more of the ignition, and do a fuel pump test. Just becuase it has worked in the past doesn't mean that it won't fail on you. Pop the distributor cap off and make sure the mechanical advance weights and everything works smoothly and isn't excessively worn. Check your vacuum advance (mightyvac does a good job of verifying if you have one), bypass the MSD box (in my case it went bad and my car ran a lot better after I finally stopped talking myself out of checking it), make sure one of your wires hasn't gotten fried on a header (remember it'll always happen on the side you can't see, use your finger). And again, I'd look into testing the fuel pump. Anyway, just a few things to look at next time you are under there.
Bunker82 is offline vBGarage Page   Reply With Quote
Old 03-26-2005, 07:52 PM   #5
Junior Member
 
Join Date: Mar 2005
Location: florida
Posts: 15
Car: 87 chevey camaro
Engine: 355 weiand supercharged
Transmission: 700r4

Classifieds Rating: (0)
Send a message via AIM to boosted 3rd gen Send a message via Yahoo to boosted 3rd gen
/..

Hmmm what size carb ?? is it popping or ( backfiring through carb)?? or actually backfiring through exhaust...very unlikely it has anythign to do with your exhaust..... sounds like either a low fuel prob under load......or archign in your distributer...... does it everty time ...dont knwo what ign u have mallory msd ect..... i would take your cap off...look for any cracks look at the rotor for black lines which would mean arching or a crack u cant see.... i would def swap out a new cap and rotor......their very cheap and this may fix your prob........ also i would buy a fuel pressure guage and air fuel guage........ this will tell u #1 if your running outa fuel....... #2 will tell you if your secondary jetting is to small and cuasing the motor to lean out under full throttle
boosted 3rd gen is offline vBGarage Page   Reply With Quote
Old 05-16-2005, 06:17 PM   #6
Senior Member
 
Join Date: Nov 2001
Posts: 532
Car: 88 IROC-Z
Engine: 383 Stroker
Transmission: TH350

Classifieds Rating: (0)
I am pretty sure it is popping through the carb. Would that mean it's getting enough gas, but not enough spark to burn it? I have an MSD pro billet distributor. I took off the cap and rotor, everthing looked fine. I have checked the wires, plugs all that stuff.

Could it be the timing chain?
rocky383 is offline vBGarage Page   Reply With Quote
Old 05-17-2005, 04:40 AM   #7
Member
 
BRobinson's Avatar
 
Join Date: Aug 2004
Location: Topeka, Kansas
Posts: 203
Car: 82 Camaro
Engine: 305
Transmission: TH-350
Axle/Gears: 3.08

Classifieds Rating: (0)
Send a message via Yahoo to BRobinson
I agree with Bunker. Sounds like the springs on the weights have gone bad in the dizzy. Or your distributor clamp has loosened enough to throw the timing off. The backfire through the carb is from the charge igniting before the intake valve is closed.
BRobinson is offline vBGarage Page   Reply With Quote
Old 05-17-2005, 09:17 AM   #8
Moderator
 
five7kid's Avatar
 
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 42,096
Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 10B-3.73/9"-3.89

Classifieds Rating: (14)

Backfiring is usually from a lean condition. Lean can also lead to pinging.

However, as usual make sure the ignition is up to snuff. It isn't unheard of for a spark to get weak or weird for one reason or another.

Re-looking over your original post & my original reply, I doubt it's a fuel delivery problem. Perhaps your power enrichment circuit isn't doing its job. The "accelerates good at first" part is really strange, though.
five7kid is offline vBGarage Page   Reply With Quote
Old 05-17-2005, 08:39 PM   #9
Senior Member
 
Join Date: Nov 2001
Posts: 532
Car: 88 IROC-Z
Engine: 383 Stroker
Transmission: TH350

Classifieds Rating: (0)
I have done a lot to it today...

Since it is mostly a pinging problem, I:

checked springs - they are the heavy silver for slowest advance
the weights - moving freely
the bushing - the biggest one for the least amount of advance
jets in carb - 410's in front and 416's in back (did have 401's in back) I thought with more fuel, pinging would be less likely.
Ignition parts seem in very good shape.

It seems that if anything, the spark would be too strong (if there is such a thing). If it was weak, it seems like the fuel would barely burn - hence no detonation.

When I run with no vacuum advance, the pinging goes away with initial timing at 6*. Any lower, it barely starts and stumbles on take off. It doesnt idle very good and does not accelerate well.

With vacuum advance, the ping is back. I stuck a 3/32 allen wrench in the canister but couldnt find an adjustment screw. It idles good, takes off decent but due to pinging, the power loss is unbearable.

I am at a loss. I appreciate the replys.

Oh yea, my mechanic suggested getting a plain jane HEI distributor.

Can too small a spark plug gap cause pinging? Mine are at 35*.

Last edited by rocky383; 05-17-2005 at 08:59 PM.
rocky383 is offline vBGarage Page   Reply With Quote
Old 05-17-2005, 09:03 PM   #10
Moderator
 
Air_Adam's Avatar
 
Join Date: Oct 2002
Location: Saskatoon, SK, Canada
Posts: 9,067
Car: '83 Z28, '07 Charger SRT8
Engine: 454ci, 6.1 Hemi
Transmission: TH350, A5
Axle/Gears: 2.73 posi, 3.06 posi

Classifieds Rating: (0)

Send a message via MSN to Air_Adam
Did you check your float level? Fuel pressure?
Air_Adam is offline vBGarage Page   Reply With Quote
Old 05-17-2005, 10:42 PM   #11
Senior Member
 
Join Date: Nov 2001
Posts: 532
Car: 88 IROC-Z
Engine: 383 Stroker
Transmission: TH350

Classifieds Rating: (0)
I guess I will do that this weekend. Ill have to run an extra hose or 2 from the fuel line into the car. I'll do a search to find out how to do it. I do have a pressure guage already attached in line. Maybe someone could ride in the engine bay and look at it while I drive...
rocky383 is offline vBGarage Page   Reply With Quote
Old 06-08-2005, 05:25 PM   #12
Member
 
Join Date: Feb 2005
Location: Fort Wayne, Indiana
Posts: 156
Car: 87 camaro sc
Engine: 357 w/ cc qjet
Transmission: 700 r4

Classifieds Rating: (0)
Send a message via AIM to theboilermaker
I have heard of a bad EGR causing pinging problem. Normally it occurs only during cruise though.
theboilermaker is offline vBGarage Page   Reply With Quote
Old 06-21-2005, 07:36 PM   #13
TGO Supporter
 
eXesiv|83ta's Avatar
 
Join Date: Oct 2004
Location: Rockford, MI
Posts: 300
Car: 1983 Pontiac Trans AM
Engine: 355 chevy
Transmission: 700R4 Built
Axle/Gears: Built 10 bolt 3.73 gears

Classifieds Rating: (4)
Anybody heard of spark knock? What is your timing set at? If its up high and its pinging under load it might be spark knock. This basically is the pre ignition of the charge of air and fuel. If it continues you can burn holes in the top of your pistons and you will be F*#@ed. Just a thought. If you think this might be the problem retard the timing until it stops knocking. Oh and check your overall timing. It should be set to 34* or so. Do this by revving the engine up to about 3500 rpm or so and make sure you have around the 34* total timing. Be sure to have the vacuum advance unhooked and the vacuum plugged at the carburator.

Last edited by eXesiv|83ta; 06-21-2005 at 07:39 PM.
eXesiv|83ta is offline vBGarage Page   Reply With Quote
Old 06-21-2005, 08:35 PM   #14
Senior Member
 
Join Date: Nov 2001
Posts: 532
Car: 88 IROC-Z
Engine: 383 Stroker
Transmission: TH350

Classifieds Rating: (0)
I tried everything short of digging into the motor (which I don't want to get into) and I can't afford to get it fixed. I bought a 94 Mustang GT and am selling my IROC. The next time I get a Chevy it'll be a Corvette.

I appreciate all the suggestions and help over the past few years from thirgen.org and wish the best for your wishes for your hot rodding pleasures.

My new car (forgive me):
Attached Images
File Type: jpg p1010002.jpg (35.9 KB, 118 views)

Last edited by rocky383; 06-21-2005 at 08:38 PM.
rocky383 is offline vBGarage Page   Reply With Quote
Old 06-21-2005, 09:03 PM   #15
TGO Supporter
 
eXesiv|83ta's Avatar
 
Join Date: Oct 2004
Location: Rockford, MI
Posts: 300
Car: 1983 Pontiac Trans AM
Engine: 355 chevy
Transmission: 700R4 Built
Axle/Gears: Built 10 bolt 3.73 gears

Classifieds Rating: (4)
Quote:
Originally posted by rocky383
I tried everything short of digging into the motor (which I don't want to get into) and I can't afford to get it fixed. I bought a 94 Mustang GT and am selling my IROC. The next time I get a Chevy it'll be a Corvette.

I appreciate all the suggestions and help over the past few years from thirgen.org and wish the best for your wishes for your hot rodding pleasures.

My new car (forgive me):
OMG...

disowned
eXesiv|83ta is offline vBGarage Page   Reply With Quote
Old 06-21-2005, 09:03 PM
ThirdGen
1992 Camaro




Paid Advertisement


Reply

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

Tags
82, accelerating, acceleration, backfires, camaro, carburetor, chevy, choppy, exhaust, gas, pinging, popping, repair, sounds, thirdgen, thirgenorg, tpi
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 02:46 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