bad fuel pump....bad supercharger?... - Page 2 - 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 11-12-2009, 10:42 PM   #11
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this is the second engine ive put in this car, the first motor also melted number cylinder, only things i can think are the same (common to both engines) are the coil packs and im, i used all the sensors from this engine, and the plugs were good when i got the engine. tomorrow i will take coil packs from my 94se and see if that changes anything im still amazed it ran with these melted plugs and didnt throw the po300 code that it was throwing before
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Old 11-12-2009, 10:43 PM   #12
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Sounds like you have a bad case of preignition. What gas are you using? 93 octane is what you should be using. Can you hear any sounds from the engine? Did you ever give the engine a good going over? Check the valve train.
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Old 11-12-2009, 11:05 PM   #13
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the engine had tr55 ngk plugs in it when i got it, they looked good, i switched them to ac delco 41-601
the gas im using is 87 octane since this is a small town and all i have access to, i can get 91 octane if i drive 20 miles away and i will stay on this thread
the only noise i can hear besides the exaust leak i described earlier in this post is a loud pinging noise at wot with boost gauge on the plus zero side, as long as boost stays on minus side i cant hear the ping
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Old 11-12-2009, 11:07 PM   #14
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Quote:
Originally Posted by chevelle_6969 View Post
the engine had tr55 ngk plugs in it when i got it, they looked good, i switched them to ac delco 41-601
the gas im using is 87 octane since this is a small town and all i have access to, i can get 91 octane if i drive 20 miles away and i will stay on this thread
the only noise i can hear besides the exaust leak i described earlier in this post is a loud pinging noise at wot with boost gauge on the plus zero side, as long as boost stays on minus side i cant hear the ping
AHHH, its the gas
anything less than 91 octane will predetonate easily which will cause you to blow the engine apart
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Old 11-12-2009, 11:11 PM   #15
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Quote:
Originally Posted by chevelle_6969 View Post
the engine had tr55 ngk plugs in it when i got it, they looked good, i switched them to ac delco 41-601
the gas im using is 87 octane since this is a small town and all i have access to, i can get 91 octane if i drive 20 miles away and i will stay on this thread
the only noise i can hear besides the exaust leak i described earlier in this post is a loud pinging noise at wot with boost gauge on the plus zero side, as long as boost stays on minus side i cant hear the ping
That ping is pre-ignition, and it can destroy your engine. You are lucky all it did was melt your plugs. You need to run 91 octane.
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Old 11-12-2009, 11:16 PM   #16
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If you want to find that exhaust leak, you can get a product called Seafoam and suck it into the throttle body using a vacuum source like the one for the brake booster. This will cause massive amounts of white smoke to come out your exhaust, and you should be able to see where the leak is. It will also give the top end of you engine a good cleaning.
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Old 11-12-2009, 11:18 PM   #17
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don't you want to do an oil change fairly quick after beacuse it will get all the junk out of the top end?
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Old 11-12-2009, 11:20 PM   #18
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Yes, a oil change shortly after a seafoam
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Old 11-12-2009, 11:22 PM   #19
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ok now ive got to figure out how to get 15 gallons of gas removed and the exaust leak is like i posted earlier from the cut off cat converter which was removed before i got the car, ive got a flex pipe stuffed in it, if i can get the car to run good enuff to drive the 50 miles to the muffler shop ill have it repaired, thanks to all who helped...ill drain gas put in new plugs when i get home in the morning .
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Old 11-12-2009, 11:23 PM   #20
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glad we could help you out, hopefully yours is different but the muffler shop that did my set up required that cars had a cat on them before they would do any work, not sure if its a local law or what
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