New motor same old problem. - Page 3 - 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 03-28-2007, 01:30 PM   #21
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yeah i was thinking that going stock on the pullie might be a good idea for now.

i will be doing fuel tests and ill get a new Fuel filter just to be safe.

As for the HB i realy think its the right one, the motor idles just fine if you ask me, ill get a vid tomorrow (no cam today )
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Old 03-28-2007, 01:32 PM   #22
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Read this thread, even though it'* long:

http://www.bonnevilleclub.com/forum/...289&highlight=

The end result ended up being the harmonic balancer. Don't discount the idea of it NOT being the HB.
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Old 03-28-2007, 11:55 PM   #23
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I read that whole thing, what you describe isnt quite like what im having, yours idles liks ****, mine idles fine, it just has no balls when it gets warm/hot.

heres a list of whats been done since the issue first happend last april.
  • new cat (magnaflow hiflow cat)
    new muffler (magnaflow F body)
    new coils (S2)
    new plugs/wires
    new motor
    New HB (with original rings)
    new manifolds (PEM'*)
    P/P LIM
    P/P */C
    K&N RX4750 (got rid of the ricer filter)
    Cleaned and polished TB
    new Fuel pump/sender/tank

things i havent changed
  • Crank sensor
    Cam sensor
    fuel filter (new when this problem started)
    Injectors
    PCM
    Maf sensor
    BCA/BCS
    ...Hell IDK what else...im running out of ideas
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Old 03-29-2007, 12:31 PM   #24
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Do you have any pictures of the new/old balancers? I'm primarily interested in the positioning of the holes that hold the rings onto the balancer in relation to the keyway. If they are identical then this shouldn't be a balancer issue, the only problem balancer related may be a vibration (and you say there isn't one). That should solve our questions of balancers and move us onto the next stage of diagnosing.

When the engine harness was swapped over, you would have repaired any bare wires or rubbed spots. Therefore we "should" be able to rule that out.

The crank sensor.. while it appears to be performing..my own experience with one leads me to have a feeling it could be a good suspect. Especially since your issue only occurs when warmed up. Something is expanding/shorting/rubbing/doing something..to cause an issue.

PCM... heck, it sure could be a possibility. Although I believe Don would have been all over it already if it was exhibiting normal failure symptoms.

Maf...you cleaned it when you had everything apart and it'* known, try unplugging it and run the engine that way. It'll set a code, but how does the car run under the same conditions that exist when the issue is noticed.
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Old 03-29-2007, 01:33 PM   #25
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I dont have any pics for comparison of the HB'* (new one was perchased/installed while i was at work)

when i did the swap, I didnt go over the harness with a fine tooth comb, but i did look i over and fix thing like tape drying/coming off and what not.


the Crank sensor I will have to take into serious thought on replacing...would a used one be good (being sure it was from a 92) I really cant see why not, considering every one is runnign on a used one if you think about it.


As for the MAF, are you saying drive it till the problem starts, then cover the sensor with something (like tape?) then see what happens?
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Old 03-29-2007, 01:51 PM   #26
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just unplug the MAF, you can drive around with out it and see if you still have the problem, thats what i did once to try to find one of my problems.
The PCM will run on a Default setting while it not plugged in.
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Old 03-29-2007, 01:54 PM   #27
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now why didnt i think about that?
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Old 03-29-2007, 01:55 PM   #28
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i didn't know either until someone told me
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Old 03-29-2007, 02:10 PM   #29
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To clarify (I know what he meant.) you can not drive around with your maf "out". You can drive and the engine will run with the maf unplugged.
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Old 03-29-2007, 09:53 PM   #30
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heres a cell-cam vid of the motor at idle (suund seans a little off from that it acctually is)
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