misssin maybe cylinder head . - 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 06-21-2009, 11:27 PM   #1
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Angry misssin maybe cylinder head .

95 pontiac bonnie, car started missin as i was driving, came hame inspected plugs, wires, coils all one at a time. no cracks leaks or anything, no fouled plugs eitha. when and had a DTC scan and it came back with a code for the knock sensor, and a misfire. changed knock sensor and had it rescanned, same problem. rechecked ignition components again and no problems found. gonna do a compression test 1st thing in the mournin. my question is if it comes down to the cylinder head, should i replace both if i get them fron a bone yard ?
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Old 06-22-2009, 12:32 AM   #2
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when you checked your coils did you pull wires off as it was running or just do a ohms test
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Old 06-22-2009, 11:44 AM   #3
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Cylinder heads are unlikely.

Is this a naturally aspriated car ?
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Old 06-23-2009, 11:17 PM   #4
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yea i checked while it running, replacd coils plugs and wires, all are firing at coils, even used a spark plug tester. checked injectors with car running all fine, compression test cam back great.
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Old 06-24-2009, 09:18 PM   #5
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How is the coolant level?

If it'* low at all, please read up on the upper intake manifold failure or UIM failure. NA cars are prone to the issue of coolant entering the cylinders. At first it starts with missing etc and can move on to hydrolocking.
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Old 06-25-2009, 09:05 PM   #6
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Angry

yea checked coolant, level is fine, heres the new scan results, ive changed every component dealing with the ignition. jus rescanned and it comes back with, knock sensor- no signal, and trans range switch. ive changed both knock sensors, so what could cause it to say (no signal). im getting frustrated with my car any suggestions ?
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Old 07-02-2009, 01:49 AM   #7
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maybe a injector have had that happen on the 99 se i just put a motor in
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Old 07-02-2009, 08:03 AM   #8
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The wiring to the rear knock sensor comes from the sensor and is an extension harness that runs over the transmission and into the wiring harness. I'd pull the passenger wheel and check that wire as it heads over the trans, through the next connector and into the harness with a multimeter to ensure good continuity. Then test the front as well.

No signal is an issue.

The trans range sensor..well..we can adjust that to get it correct or replace it. It'* located right on top of the trans toward the back.
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Old 07-06-2009, 11:30 PM   #9
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wanna thank everyone for their input, but finally came to the solution to solve my problem. after checkeing and changing every ignition component that would cause a misfire, i took my car to a shop to have them look at it and give it a shot. they checkd everything that i checkd and said it was all good, did another compressin test and the cylinders were strong as ever, so the next thing they were gonna do was tear down the intakes and charge me $600. by me having the knowledge i have i decided to do it myself. and sure enough as i took off the pllenum, one of the coolant chambers near the throttle body was chipped badly and the gaskest around one the exhaust ports was busted. replaced everything, put it back together and WWWWAAAAAlllaa. fired right up test drove stronger than it felt at 1st. Talk about a needle in a hay stack !!!! thanks !!
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