Engine knocking and then I scanned - 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 10-21-2007, 07:49 PM   #1
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Default Engine knocking and then I scanned

I drove my daughters car today and I loved it. Had lots of power and transmission shifted great. It was a nice day here with temps in the mid 70'* so I had the windows down. Well I heard some engine knocking during acceleration I didn't like. It didn't seem to effect the performance though. I hook up scanner and notice some strange numbers. I have always got KS but no KR. I took it back on the road after I cleared codes and as usual no KR. Keep in mind CEL wasn't on. The knocking got worse when I got gas.

The two codes were:

P0406: Linear EGR Pintle position Error- I found through search and I'll take off and see if I can clean EGR first.

P0171: Fuel Trim sensor signal lean.- Couldn't find what it means

Other odd info: (I believe these had 0 values before)

RPM Failed 98

RPM Passes 255

MAP Failed 2


Like I said I cleared codes and drove for about 15 minutes driving up to 45 mph. Scanned again and got no codes. Any thoughts on where I should look?
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Old 10-22-2007, 09:23 AM   #2
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P0171 is well documented by me.

Check for vacuum leaks and corrosion on/in the battery cables. The biggest cause is typically battery cables or a failing Evap system.
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Old 10-22-2007, 11:17 AM   #3
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Thanks Bill. I did a search and found all kinds of info on P0171. I don't know why I couldn't find it yesterday. i found this info http://www.bonnevilleclub.com/forum/...ighlight=p0171

I'll give that a shot.
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