Mis-fire, Shutter, Shake, No-Rev, etc... - Page 2 - 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 12-08-2008, 12:10 AM   #11
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Default <--- confused by instructions... feeling kinda ditsy right now

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Try checking the joints between the head and the LIM
Ok, sorry im kinda out of it.. please elaborate on what you mean by "checking the joints"... and whats the definition of LIM??? Lower Intake Manifold? thats my only thought of what it could be but like i said im out of it... sorry :P
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Old 12-08-2008, 08:05 AM   #12
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Yes, Lower Intake Manifold. Check where it contacts the head.
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Old 12-08-2008, 08:02 PM   #13
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Lightbulb Code Check Complete

Haven't gotten a chance to check on the L.I.M. :P but I did get the codeS... now I just gotta get in contact with a friend of a friend to get a fuel pressure tester to make sure its not the fuel pump going out cuz that'* what I'm thinking its problem might be

Codes list as follows:
P0325 - Knock Sensor Circuit (History Code)
P0131 - Heated O2 Sensor - low Voltage (History Code)
P0171 - Fuel Trim Lean (Active Code)
Now as I said... the fuel pump was changed about a week before the problem at hand started so I'm thinking its a lack of fuel causing the problem... will test soon and let you guys know.

again thanks for the support
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Old 12-08-2008, 08:20 PM   #14
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P0131 - Heated O2 Sensor - low Voltage (History Code)
P0171 - Fuel Trim Lean (Active Code)
I'm thinking these 2 codes go hand in hand and are major contributors to your problem. O2 sensor stuck in a rich condition will tell the PCM to lean out the mixture.
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Old 12-08-2008, 08:41 PM   #15
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I'm thinking these 2 codes go hand in hand and are major contributors to your problem. O2 sensor stuck in a rich condition will tell the PCM to lean out the mixture.
A Friend (GM Parts Guy, Beloved Camaro SS owner lol) had the code tester and we agreed in that we think all 3 are related together...
Possibility - Fuel pressure low (160,000 miles on original pump) and its the pump not putting enough fuel to it causing the knock sensor to react and the o2 sensor to go on the fritz and thats why they are history codes, not active

I talked to him about the thought... was thinking it made sense but he said that it couldnt be the sensor showing rich because then it would show on the code that the fuel trim was rich because the sensor was reading rich, so its a good idea but the codes would have been different. Plus its low voltage on the 02 sensor not lean or rich readouts

thanks for the thought tho, great idea

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Old 12-08-2008, 10:01 PM   #16
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Originally Posted by tlsheff View Post
A Friend (GM Parts Guy, Beloved Camaro SS owner lol) had the code tester and we agreed in that we think all 3 are related together...
Possibility - Fuel pressure low (160,000 miles on original pump) and its the pump not putting enough fuel to it causing the knock sensor to react and the o2 sensor to go on the fritz and thats why they are history codes, not active

I talked to him about the thought... was thinking it made sense but he said that it couldnt be the sensor showing rich because then it would show on the code that the fuel trim was rich because the sensor was reading rich, so its a good idea but the codes would have been different. Plus its low voltage on the 02 sensor not lean or rich readouts

thanks for the thought tho, great idea
good to know.
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Old 12-17-2008, 04:40 PM   #17
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Exclamation Playing At Work, Fuel Pressure Test

LOL testing the car while working... love working at a shop

tested the fuel pressure finally... testing came to the following:
ignition on - 30psi
engine started idle - 30-32psi
driving steady, crusing - 30-35 psi
W.O.T. - 45 psi max, think it was actually a little less, mostly 40 psi

co-worker tested similar car with same motor, minus supercharger, l27 motor not l67, never dropped below 45 psi and that was idle... 55+ psi at WOT, thinks the fuel pump is lacking... any other thoughts??? pump is $145 my cost but i dont want to buy one if it wont fix it
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Old 12-20-2008, 11:39 PM   #18
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Default Pump Installed... Problem Still There

Installed the new AC Delco fuel pump... still the same problem... lack of power, engine shutters, runs like a 4 banger with 6 cylinders.
Monday gonna check the fuel pressure and recheck the codes to make sure the new pump is running the right pressure specs... gonna clear the computer tomorrow see if the same codes come back or if it changes to give me a new direction to look at...
thinking towards cam/crankshaft sensors and or ecm problems.... any ideas to go towards???
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Old 12-21-2008, 12:07 AM   #19
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I would lean towards the crank sensor.
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Old 12-21-2008, 12:30 AM   #20
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K K was kinda thinking of replacing it and the camshaft sensor... together it would only be like 50 bux so to kick them out i thought about replacing both
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