93 SE - KNOCK! - 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 10-25-2007, 02:15 AM   #1
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Default 93 SE - KNOCK!

Scanned the car and saw up to 4 degrees of knock under heavy accel. From a dead stop to full punch, it peaks at 4 and then very quickly drops off.

So far its been noted that there is...

Possible Vacuum Leak
Probable Exhaust Leak at downpipe
Original Arcing Spark Wires

Maybe Jesse can remember something I forgot that was noted.
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Old 10-25-2007, 08:21 AM   #2
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How about lower octane fuel and fairly normal reading?
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Old 10-25-2007, 11:57 AM   #3
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Actually that was running Shell 93 VPower.

And this is not normal. It very noticeably BOGS when it gets hot. Its a whole different car once its cooled back down.
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Old 10-25-2007, 11:59 AM   #4
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Try diffrent OCtane... see what happens.
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Old 10-25-2007, 12:02 PM   #5
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I have. I've tried Regular/Plus and Premium from Kwik Trip, Exxon, Shell, and Philips. Still bogs.
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Old 10-25-2007, 12:08 PM   #6
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I am still learning about knock so bear with me. The interesting thing with Johns car is that the knock seems to be on the bottom end. When he stepped it down it would jump to 4 then 3, 2, 1. That seems a little different than mine where knock dosen't start until the mid to upper ranges. I think I have also heard that running a higher octane will not help the car unless it needs it. His car also was running at the usual 200 mark on the temp. Not sure if it helps to run at 180 for a decrease in KR. Keep in mind that John does believe that the wires are original and need to be replaced. This could be most of the problem.
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Old 10-25-2007, 12:10 PM   #7
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What have you done for Tune up?

EI: Plugs, Wires, O2, PCV, things like that...

Also have you checked for exhaust leaks...

and... if you have done the plugs... pull then to make sure that gaped right and check them to see how thee looking...
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Old 10-25-2007, 12:54 PM   #8
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Original Wires
New TR55s
New PCV
Original o2
New Air Filter
Original Cat
New Fuel Filter

and like i said...suspected exhaust leak at the downpipe/manifold. audible ticking.
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Old 10-25-2007, 01:05 PM   #9
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Quote:
Originally Posted by wjcollier07
and like i said...suspected exhaust leak at the downpipe/manifold. audible ticking.
Well take a look at the exhaust Donut. if it looks like its leaking around that, Replace it, its only $3-8
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Old 10-25-2007, 02:37 PM   #10
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Quote:
Originally Posted by wjcollier07
Original Wires
14 year old wires?
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