Go Back   LS1TECH > WELCOME TO LS1TECH > New LS1 Owners - Newbie Tech
Sign in using an external account
Register Forgot Password?
Register iTraderTimeslips Photos Members Search Today's Posts Mark Forums Read Used CarsVendor Directory
Search

New LS1 Owners - Newbie Tech
Basic Technical Questions & Advice
Sponsored by
Improved Racing

Welcome to LS1Tech.com!
Welcome to LS1Tech.com.

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 LS1Tech.com today!


Reply
 
Thread Tools Search this Thread
Old 05-07-2010, 01:09 PM   #1
Launching!
2000 Pontiac Trans Am
 
Trader Rating: 1
Join Date: Jul 2009
Location: neversink, ny
Posts: 296
Default what causes backfires?

LS1 trans am (a4).. first day driving it since september.
Seems to only happen sometimes if i get on it real hard.. and sometimes when im cruisin in 1st or 2nd and stomp it.. it'll backfire sometimes.. even stalled once. What could be the problem?
ripgtp97 is offline   Reply With Quote
Old 05-07-2010, 01:15 PM   #2
Launching!
2000 Pontiac Trans Am
 
Trader Rating: 1
Join Date: Jul 2009
Location: neversink, ny
Posts: 296
Default

well i just read the thread about 10 posts beneath mine haha.. and its definately when i got hard on throttle then let off all the way that it backfires.. is it normal for it to completely stall sometimes though?
ripgtp97 is offline   Reply With Quote
Old 05-07-2010, 03:36 PM   #3
TECH Senior Member
Garage is empty, add now
 
01ssreda4's Avatar
 
Trader Rating: 86
Join Date: Aug 2007
Location: Turnin' Wrenches Infractions: 005
Posts: 18,369
Default

No, stalling is not part of a car's running condition. If the car is basically stock then I would look for obvious things like plugs, wires, fuel/air filters, and 02 sensors. All are good items to put on your spring tune up list. Also consider cleaning your MAF.
__________________

01 SS Rally Red A4 #4987, 04 Yukon XL Denali, 99 Cadillac STS-SOLD
01ssreda4 is offline   Reply With Quote
Old 05-20-2010, 08:09 PM   #4
Launching!
2000 Pontiac Trans Am
 
Trader Rating: 1
Join Date: Jul 2009
Location: neversink, ny
Posts: 296
Default

well i cleaned the maf, and have plugs and wires on the way.. I did a top engine clean with mopar combustion chamber cleaner, and it'll only stall now sometimes if i go WOT.. i'm really hoping its just plugs, and maybe some filters.. but what else could be problems? Running too rich, not really sure what to think (my rear O2's are tuned out as well)
ripgtp97 is offline   Reply With Quote
Old 05-20-2010, 08:12 PM   #5
TECH Apprentice
Garage is empty, add now
 
ZigZagZ's Avatar
 
Trader Rating: 0
Join Date: Jan 2003
Location: Jefferson, LA
Posts: 335
Default

Is it backfiring thru the exhaust, or thru the intake manifold?

Exhaust = Rich

Intake = Lean
__________________
2001 Z-28
Artic White 6-Speed
No Options

ZigZagZ is offline   Reply With Quote
Old 05-20-2010, 08:33 PM   #6
Launching!
2000 Pontiac Trans Am
 
Trader Rating: 1
Join Date: Jul 2009
Location: neversink, ny
Posts: 296
Default

not sure how you can tell the difference? but i hear it popping out the exhaust, and when it stalls i don't really hear a backfire, just dies out
ripgtp97 is offline   Reply With Quote
Old 05-21-2010, 10:49 AM   #7
TECH Fanatic
2000 Chevrolet Camaro
 
TooLateVTEC's Avatar
 
Trader Rating: 2
Join Date: Apr 2009
Location: FredVegas, Va
Posts: 1,446
Default

The plugs are probably killed from the CC cleaner you used.

A fouled plug will cause a backfire through the exhaust.
__________________
Allyn
2000 Camaro SS A4 #3535 Heads/Cam/Intake/Stall

91 Camaro - 6.0, rods/pistons,cam, GT47-88, stock suspension on 275's,tilt wheel and pwr windows
5.52@126
In car-http://www.youtube.com/watch?v=Clg-9Taax8o
TooLateVTEC is offline   Reply With Quote
Old 05-22-2010, 02:58 PM   #8
Launching!
2000 Pontiac Trans Am
 
Trader Rating: 1
Join Date: Jul 2009
Location: neversink, ny
Posts: 296
Default

well im changing the plugs.. but it was stalling even before i did the chamber clean
ripgtp97 is offline   Reply With Quote
Old 05-22-2010, 05:08 PM   #9
11 Second Club
Garage is empty, add now
 
stngtamr29's Avatar
 
Trader Rating: 1
Join Date: Mar 2010
Location: Mooresville NC
Posts: 293
Default

Exhaust leak everytime
__________________

Carbonfiber Wrapped 00 Trans Am Daily Driver
Heintz Racing 370 10.7-1C/R Hand Ported AFR 215's, F1A Procharger, 16.5psi, BIG CAM, 3600 Vigi, Moser 9inch, RPM lvl 7 4l65, Kooks 1 7/8 with Kooks 3in.True Duals, AMS1000/66mm W/G Custom Launch Control, 927rwhp 834rwtq on 93 oct
99 Z28 Lid and Catback (Wife's car)
Heintz Racing Built Heintz Racing Tuned (704-658-2302)
stngtamr29 is offline   Reply With Quote
Old 05-22-2010, 05:10 PM   #10
11 Second Club
Garage is empty, add now
 
stngtamr29's Avatar
 
Trader Rating: 1
Join Date: Mar 2010
Location: Mooresville NC
Posts: 293
Default

Sounds like two problems one being the exhaust leak.
__________________

Carbonfiber Wrapped 00 Trans Am Daily Driver
Heintz Racing 370 10.7-1C/R Hand Ported AFR 215's, F1A Procharger, 16.5psi, BIG CAM, 3600 Vigi, Moser 9inch, RPM lvl 7 4l65, Kooks 1 7/8 with Kooks 3in.True Duals, AMS1000/66mm W/G Custom Launch Control, 927rwhp 834rwtq on 93 oct
99 Z28 Lid and Catback (Wife's car)
Heintz Racing Built Heintz Racing Tuned (704-658-2302)
stngtamr29 is offline   Reply With Quote
Old 05-22-2010, 05:30 PM   #11
Launching!
2000 Pontiac Trans Am
 
Trader Rating: 1
Join Date: Jul 2009
Location: neversink, ny
Posts: 296
Default

exhaust leak and what else? im not worried about the exhaust leak sinc eim getting headers in about a month
ripgtp97 is offline   Reply With Quote
Old 05-22-2010, 05:59 PM   #12
11 Second Club
Garage is empty, add now
 
stngtamr29's Avatar
 
Trader Rating: 1
Join Date: Mar 2010
Location: Mooresville NC
Posts: 293
Default

Quote:
Originally Posted by ripgtp97 View Post
exhaust leak and what else? im not worried about the exhaust leak sinc eim getting headers in about a month
Does your check engine light come on? Mine did this awile back and it was the Mass air but alot of times when mass airs act up it will turn your line pressure up in your tranny and it will shift hard. Mine jurked so hard going into gear that it broke 4 teeth off the pinion gear in my old 10 bolt.
__________________

Carbonfiber Wrapped 00 Trans Am Daily Driver
Heintz Racing 370 10.7-1C/R Hand Ported AFR 215's, F1A Procharger, 16.5psi, BIG CAM, 3600 Vigi, Moser 9inch, RPM lvl 7 4l65, Kooks 1 7/8 with Kooks 3in.True Duals, AMS1000/66mm W/G Custom Launch Control, 927rwhp 834rwtq on 93 oct
99 Z28 Lid and Catback (Wife's car)
Heintz Racing Built Heintz Racing Tuned (704-658-2302)
stngtamr29 is offline   Reply With Quote
Old 05-22-2010, 06:19 PM   #13
Launching!
2000 Pontiac Trans Am
 
Trader Rating: 1
Join Date: Jul 2009
Location: neversink, ny
Posts: 296
Default

my tranny does shift kinda hard actually compared to other cars i've driven, but there's no SES light on.. i had the rear O2's tuned out..anyway to check this mass air?
ripgtp97 is offline   Reply With Quote
Old 05-23-2010, 04:50 AM   #14
TECH Regular
Garage is empty, add now
 
lovescamaros28's Avatar
 
Trader Rating: 0
Join Date: Mar 2007
Posts: 439
Default

bad plugs or wires,running too rich,or exhaust leak. a backfire is caused when unburned fuel(hydrocarbons)combust in the exhaust.
lovescamaros28 is offline   Reply With Quote
Old 05-24-2010, 11:28 PM   #15
Staging Lane
Garage is empty, add now
 
Trader Rating: 0
Join Date: Mar 2010
Posts: 65
Default

Quote:
Originally Posted by ripgtp97 View Post
my tranny does shift kinda hard actually compared to other cars i've driven, but there's no SES light on.. i had the rear O2's tuned out..anyway to check this mass air?
id like to know this aswell how to check mass air cuz when i shift it jerks the car everytime pretty noticeable
torqls1 is offline   Reply With Quote
Old 05-25-2010, 06:46 PM   #16
Launching!
2000 Pontiac Trans Am
 
Trader Rating: 1
Join Date: Jul 2009
Location: neversink, ny
Posts: 296
Default

Today i went 3/4 throttle everything was fine.. as soon as i gave it that little more and at about 5k RPm.. either when it shifted or just hit 5k, it stalled.. definately a differnet smell from the exhuast when it does this as well
ripgtp97 is offline   Reply With Quote
Old 05-25-2010, 06:46 PM
LS1Tech
Pontiac Firebird




Paid Advertisement
Reply

Tags
2001, 370, 4v, bacjfires, backfire, backfiring, camaro, exhaust, injector, leak, ls1, ls1tech, motor, popping, racing, trans


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 On
Refbacks are Off



All times are GMT -5. The time now is 02:25 PM.


Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.5.2
Advertising - Terms of Service - Privacy Statement - JOBS
Emails & Contact Details