OVERHEATING, ENGINE MISSING SOLVED! - 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 07-19-2005, 08:25 PM   #1
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Default OVERHEATING, ENGINE MISSING SOLVED!

Hello there!
It'* been a while since I posted due to internet connection problems. I have a 93 ssei that was a salvaged vehicle that was overheating and rough starting. As per your suggestion I replaced radiator, hoses, O2 sensor,180 thermostat, re-set the computer, etc. All to no avail. Now I write to tell you what solved the problem so anyone having these simptoms can look at this and see if may aliviate their problems.
Ended up being a combination of two things:
1) A slowly desintegrating harmonic balancer
2) A rear exhaust manifold with a hole in it.

Replaced the harmonic balancer and cleaned the sensor. Also took out the exhaust manifold (rear) and welded the hole.

Problem solved ....so far

Any comments would be appreciated.
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Old 07-20-2005, 03:30 AM   #2
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how big of a hole in the exhaust manifold? thats the first time ive heard of that problem on a Bonneville, but hey im glad you got it up and running, just dont go oppressing us naturally aspirated folks with your fancy shmancy supercharger...
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Old 07-20-2005, 12:07 PM   #3
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I am in no way saying you are wrong...

The harmonic balencer was what was causing the misfire, right?

But how does a hole in the exhaust manifold cause overheating? Do the exhaust gasses in the engine bay really heat things up more than the manifolds getting hot themselves?

Just looking for education
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Old 07-20-2005, 12:26 PM   #4
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Quote:
Originally Posted by Logan
I am in no way saying you are wrong...

The harmonic balencer was what was causing the misfire, right?

But how does a hole in the exhaust manifold cause overheating? Do the exhaust gasses in the engine bay really heat things up more than the manifolds getting hot themselves?

Just looking for education
The harmonic balancer being bad caused the car to run horribly. Most likely seemed like a misfire.

The exhaust leak can cause elevated temps because the motor will run w/less restriction depending on the size of the hole. On that note...my FEM was cracked when I got the car in about 3 places.
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Old 07-20-2005, 12:54 PM   #5
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Wel... As far as I understand it, it was a conbination of things:

The hole in the exhaust manifold (unknown size, sorry) was enough to throw the O2 sensor off. Also, it seems the harmonic balancer desintegration affected the sensor either by moving it out of position or by making it dirty. anyway, when the harmonic balancer was replaced, the sensor was removed, cleaned and re-installed.
It used to give me 160 miles per tank on regular driving conditions. Let'* see what it does now.
I'll keep you posted.
Ah! regarding the hole size... I didn't actually see it, but it was big enough that you could distinctly hear the pistons firing. Now it'* all quiet.
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Old 07-20-2005, 02:08 PM   #6
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wow that is bad mileage
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Old 07-21-2005, 12:24 AM   #7
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