Help interpreting scan tool data - Page 4 - 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 09-15-2005, 05:22 PM   #31
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I agree. Very obvious leaks at those cylinders. Hard to say what'* worse, that or the cracks.
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Old 09-15-2005, 06:17 PM   #32
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Quote:
Originally Posted by bill buttermore
Even Ben was on the right track with exhaust, though we will have to see if the EGR values change with the new part. Seems everyone had a clue but me!
It was just an uneducated guess, Bill.... I certainly didn't have much of a clue!


Glad to see you found that crack..... let us know when you're up and running. I remember what a dog that car was, so I hope this fixes the problem.
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Old 09-15-2005, 08:45 PM   #33
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Quote:
Originally Posted by jr's3800
Bill it looks like the exahust gaskets for cylinder 3 and 5 were also leaking.... I can see the carbon tracking on the front manifold face...
Quote:
Originally Posted by willwren
I agree. Very obvious leaks at those cylinders. Hard to say what'* worse, that or the cracks.

Gaskets? GASKETS????? GASKETS!!!!!!!! What gaskets? Since I have owned it, and who knows how long before that, this car never had 'em. This is my first L36, so who knew? Think that might be part of the problem? Parts house says $11for a set. Ummm.....you can start removing those stars by my name any time you are ready..it won't matter anyway 'cuz I will have shot myself by then!

You might have guessed that when I installed the new manifold the tickticktick was still there along with the KR. Might be Saturday now 'til I can do this again. Oh Jeez!
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Old 09-15-2005, 08:58 PM   #34
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Maybe there are no gaskets... I know on my 91 there were none... But I installed a set to avoid leaks...

I will have to find the time and yank my front manifold as I have a ported one sitting here...

When you get to it keep us updated... I'm interested in this..

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Old 09-16-2005, 12:52 AM   #35
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Mine had no gaskets from the factory. I installed them because I stitch-welded the outside of my flanges so I could port out the OEM weld on the inside of each port. There was a slight chance the flange warped, and I didn't feel like having it machined. Gaskets are a VERY good idea, so get some. They're made just the same as the EGR gasket.

I'll have to re-tourqe mine on the Zilla in a couple weeks, but my exhaust will have NO leaks.
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Old 09-17-2005, 02:47 PM   #36
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OK, installed the exhaust manifold gaskets this morning and I am 99.999999% sure that I have no exhaust leaks. But what I do have is a tick..tick..tick...same sound as before, and a bucketload of false KR. I am pretty sure this is the noise the sensors are hearing as I am hearing it too.

I made a short 30 second avi video with my camera and with the sound all the way up on the computer, you can hear the tick pretty clearly. But I don't know where I can upload it so you guys can hear it.

[edit:The sound seems to be loudest around cylinder #4. As you increase engine speed from idle it quiets down until about 2000 rpm then you start to hear it and the KS counts go crazy and the KR starts to rise.]

My, what a tedious problem this is!
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Old 09-17-2005, 04:16 PM   #37
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Bill, I don't know what to suggest for you, but if you need any help working on this thing just let me know. Monday and Tuesday are both pretty free for me, so send me a PM if you want a hand.
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Old 09-17-2005, 04:34 PM   #38
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Thanks, Ben. I still have to check out the overtorque possibility that Foghorn suggested, but I have a feeling it won't be long before that engine is gonna' be in the garage, on my stand, and in a zillion pieces.
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Old 09-17-2005, 05:02 PM   #39
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I'd still be curious to see what would happen if you swapped the sensors, or perhaps even just disconnected the rear. True knock or detonation can be detected by a single sensor. Series 1 only has one in the front bank.
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Old 09-17-2005, 06:20 PM   #40
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Quote:
Originally Posted by bill buttermore
what I do have is a tick..tick..tick...same sound as before
Tell me about the rocker instal proceedure you used after the lifter replacement. I'm also assuming you left the lifters to soak in engine oil for many hours before the instal.

I know it'* not easy to get the rear valve cover off, but it may be worthwhile doing so to check for loose rockers. It would best to step the motor through the firing order to check the rockers. To check #4, set #1 so that the exhaust valve is just closing and the intake beginning to open (TDC exhaust). That way you know both lifters are on the cam base circle for #4.

Cheers,
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