misfire/backfire 92 bonneville se 3800 - 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.

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Old 10-21-2002, 03:47 AM   #1
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Default misfire/backfire 92 bonneville se 3800

Im having a misfire backfire prob with my bonneville. Its been doing this since I bought it and I havent been able to figure out what it is. I think it may be my fuel lines but im not sure i was also thinking about having the crank sensor replaced but if that was bad I dont think it would run. Its not the ignition modle or coil packs, I already replaced those. I found a NOS kit, Performance computer upgrade (programmable by laptop) and a new ignition system that will do nicely but I dont want to put any of that on till I find out what the problem is. The computer isnt throwing out and service codes either so I was hoping to get some suggestions. PLEASE HELP ME!!! I love this car to death and I want to deck it out but I wont do it till I figure out why its running like this. [b]As soon as you stomp on the gas it sputters and backfires. If its cold it runs a little smoother and if you take off like a sunday driver it does ok to. Any suggestions?
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Old 10-21-2002, 08:36 AM   #2
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I would take a guess at either the fuel injectors being clogged/worn out or the throttle body being excessively dirty. I assume you have already checked the wires and plugs..............
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Old 10-22-2002, 12:39 AM   #3
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Default Re: misfire/backfire 92 bonneville se 3800

Quote:
Originally Posted by blue_bonn_evil
Im having a misfire backfire prob with my bonneville. Its been doing this since I bought it and I havent been able to figure out what it is. I think it may be my fuel lines but im not sure i was also thinking about having the crank sensor replaced but if that was bad I dont think it would run. Its not the ignition modle or coil packs, I already replaced those. I found a NOS kit, Performance computer upgrade (programmable by laptop) and a new ignition system that will do nicely but I dont want to put any of that on till I find out what the problem is. The computer isnt throwing out and service codes either so I was hoping to get some suggestions. PLEASE HELP ME!!! I love this car to death and I want to deck it out but I wont do it till I figure out why its running like this. [b]As soon as you stomp on the gas it sputters and backfires. If its cold it runs a little smoother and if you take off like a sunday driver it does ok to. Any suggestions?
Well all you guys are missing the problem here! Remember MY 92 SE! Remember Im running on 5.5 cylinders & why! Remember the 92 3800 NA is EGRless! Okay, here'* what you do to confirm my suspicions: Do a dry compression check on ALL the Cylinders. What I think you will find is that one cylinder will be considerably lower than the rest. What this means is that you've got the EXACT SAME problem as me & all other EGRless 3800 owners do: A BURNT VALVE! It took me two months to figure out my miss BTW!
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Old 10-22-2002, 07:23 PM   #4
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i hooked up my code reader again because now it is also idleing funny it keeps jumping up and down if you know what I mean and it read code 44 which is lean exaust something i dont have my book on me but i know it was lean exaust. How hard is it to do the valves on the 3800? I prefer to do all the engine work on my car. Also if I am to put major performance parts on the bonne what types of upgrades do I need to do to make sure the engine will handle it. Remember this car now has 210,000 miles now but shes still running strong. One thing I was thinking of doing was purchasing a new engine and building that one up until I have everything I want on it. I found a new one for $1500 and a used one with 80,000 miles on it for $300 what do you suggest?
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Old 10-24-2002, 02:48 PM   #5
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I know this sounds bad since I like doing all the work on my car but how do you check the compression? thanx for all your help to. I cant tell you how long I've been looking for a website like this. Thanx everyone.
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Old 11-09-2002, 11:44 AM   #6
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With that many miles you don't want to do just the heads. If you do the bottom end might not like it. I suggest a total rebuild rather than just the top end.
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Old 11-09-2002, 12:04 PM   #7
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Quote:
Originally Posted by jr's3800
Quote:
Originally Posted by 2001SSEi
With that many miles you don't want to do just the heads. If you do the bottom end might not like it. I suggest a total rebuild rather than just the top end.
I did the heads on my 91 bonnie about 10,000 - 15,000 miles ago and do nothing but run the hell out of it... it runs 10 times better than it ever did.. I have only seen one 3800 throw a rod... It threw a rod because the owner ran it low on oil and kept driving.. Threw the rod through the block... The older 3800'* were not performance engines but had the dimple rods, roller lifter, low friction piston rings..... it had a lot of race derived technology in it.... I've seen some 3800'* go as long as 300,000 miles with no engine work... just welll taken care of.. You will find a knocking 3.0 or 3.8 V6 engines in the junk yard... But the majority of the time the Buick 3300'* and 3800'* outlasted the cars they were in... I have A 3800 series 1 and a series 2... both have served me quite well..As will your 2001SSEi... They are built to last......
Thanks for the words of encouragement. My point is 210,000 miles is closer to 300,000 than 100,000. If it were my Bonnie and I wanted to keep it I would go through the engine once and be done with it.
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Old 11-09-2002, 12:26 PM   #8
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I agree. The possibilities are endless and the 3800 has a long history that proves it.
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Old 05-29-2011, 04:24 PM   #9
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Default Missfire/backfire.

I dont know if this will help but i was having the same problem with my 97 pontiac firebird. I put a motor in it from a 96 buick and this is the problem i was having. I tried changing the plate underneath the coilpacks and it solved all my problems. No misfire or backfire and the trouble code went away.
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Old 05-29-2011, 04:36 PM   #10
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I would hope that after nearly 9 years this problem has been resolved. Plese check the thread dates.
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