Back firing - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 02-11-2007, 03:09 PM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Oct 2006
Location: Ellenville,NY
Posts: 73
Thanks: 0
Thanked 0 Times in 0 Posts
BLAZZ is on a distinguished road
Default Back firing

my car hasnt ran in 4 months, its fixed now but it runs ruff and it was back firing today
and has lack off power, Its a 93, and it ran good b4 it stoped runing, it had a wiring problem, its got a new cam and crank sensors, now,
and the throttle position senser is only 1 year old, i tryed to clean the MAF out but it did not help, and the spark plug wire is not on the O2 senser,
Any ideas

BLAZZ is offline   Reply With Quote
Old 02-11-2007, 03:25 PM   #2
Junior Member
 
Join Date: Apr 2006
Location: Purgatory
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Bonneville92V688 is on a distinguished road
Default

Have you changed the spark plugs yet? How about wires?

And did you check the resistance of the coils?
Bonneville92V688 is offline   Reply With Quote
Old 02-11-2007, 03:42 PM   #3
BANNED
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
banned3800 is on a distinguished road
Default

Sounds almost like you have a bad coil .... Check them..

__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
banned3800 is offline   Reply With Quote
Old 02-11-2007, 10:14 PM   #4
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Oct 2006
Location: Ellenville,NY
Posts: 73
Thanks: 0
Thanked 0 Times in 0 Posts
BLAZZ is on a distinguished road
Default

Spark plugs and wires are about a year old, plugs looked good when i pulled them,

Coils are all old, but tested good when i was trying to fix the last problem,
same with my back up coils, but i will retest,

it only doe'* it when the car is cold, but when i first start it up it runs varry good for like 1 min then it starts runing bad, till it warms up, and after it warms up its ok with a big lack of power,

i was thinking its going into limp mode or something, but the cam and crank sensors or new
BLAZZ is offline   Reply With Quote
Old 02-11-2007, 10:30 PM   #5
Senior Member
True Car Nut
 
Join Date: Nov 2002
Location: Texarkana, Texas
Posts: 6,041
Thanks: 0
Thanked 0 Times in 0 Posts
Damemorder is on a distinguished road
Default

Sounds like a vacuum leak.
Damemorder is offline   Reply With Quote
Old 02-11-2007, 11:50 PM   #6
Senior Member
Posts like a Turbo
 
Join Date: Oct 2006
Location: Whitewater, Wisconsin
Posts: 319
Thanks: 0
Thanked 0 Times in 0 Posts
nicklikesmilk is on a distinguished road
Default

if it hasn't run in 4 months, then the fuel has probably been sitting there in the tank not being used, and now the car is being run on really old gas. gasoline only has a shelf-life of about 28 days, so it could just be bad gas
nicklikesmilk is offline   Reply With Quote
Old 02-12-2007, 03:03 AM   #7
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Oct 2006
Location: Ellenville,NY
Posts: 73
Thanks: 0
Thanked 0 Times in 0 Posts
BLAZZ is on a distinguished road
Default

'''Sounds like a vacuum leak, '''.... I hope not, i hate vacuum leaks!!!

'''the car is being run on really old gas'''... I ran about a new full tank by now, and it was on E when i got it back.

this car has 85,600 but its stuck on that, The car sat for 8 years B4 i got it from the 1st owner,its a 93,... 85,600 is what it had when i got it, i put maybe 40,000, on it but idk its stuck on that.

So far...
I had to put new brake lines on, thay were all bad from seting in the grass for so long....
I had to swiched out the ICM,
new master cylinder
Put in a used Rack-and-Pinion Steering, {not fun}
2 tune up'* {no O2}
new TPS,cam, crank, and MAF sensors
new EGR
new Cat and muffler
then a bad cam sensor wire
new barring
The tran had no fluid in it when i got it, and has had a small wine at low speeds, but shifts good, still does
TCS and ABS never worked.....

Im gona get some new plugs and wires. and do my best to look for a vacuum leak.

Today when i was swiching the Coils out i snaped one on the nuts on the plate that the ICM sets on..but it still runs,,what is that plate called, its not in my book
BLAZZ is offline   Reply With Quote
Old 02-12-2007, 03:10 AM   #8
Senior Member
True Car Nut
 
Join Date: Nov 2002
Location: Texarkana, Texas
Posts: 6,041
Thanks: 0
Thanked 0 Times in 0 Posts
Damemorder is on a distinguished road
Default

You should really fix the odometer. They're very simple.


"Today when i was swiching the Coils out i snaped one on the nuts on the plate that the ICM sets on..but it still runs,,what is that plate called, its not in my book"

Let me think about this.... I have no idea what it'* called, But it'* going to be a junkyard part anyway.
Damemorder is offline   Reply With Quote
Old 02-13-2007, 09:37 PM   #9
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Oct 2006
Location: Ellenville,NY
Posts: 73
Thanks: 0
Thanked 0 Times in 0 Posts
BLAZZ is on a distinguished road
Default

Quote:
Originally Posted by Damemorder
You should really fix the odometer. They're very simple.
plz, do tell
BLAZZ is offline   Reply With Quote
Old 02-13-2007, 10:56 PM   #10
Senior Member
True Car Nut
 
Jack's Avatar
 
Join Date: Sep 2005
Posts: 3,105
Thanks: 0
Thanked 0 Times in 0 Posts
Jack is on a distinguished road
Default

sounds like mine did when the plugs and wires were crappy, and then again when a coil went, and then AGAIN when my MAF sensor crapped out. Although if it was your MAF you should be getting a Check Engine light, at least mine was.

I agree that it sounds like a vacum leak
Jack is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1992 bonneville back firing through intake..........help me helpme_22 1992-1999 7 02-24-2009 10:06 PM
rear firing or firing up bonnevillemac Audio (and aftermarket electronics) 4 01-25-2008 05:04 PM
Who has info on in firing subs? givemebreak Audio (and aftermarket electronics) 10 08-26-2004 08:32 PM
Help PLease with Chevy Beretta problem..1 coil not firing! 95neongirl Lounge 3 04-29-2004 01:50 PM
Harmonic Balancer Question - Firing Diagram needed Highlight 1992-1999 6 03-25-2004 12:21 AM


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



All times are GMT -4. The time now is 12:19 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.