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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 04-20-2008, 02:10 AM   #61
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Can you sum up what you have tried?
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Old 04-20-2008, 10:45 AM   #62
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Did tightening the battery cables help? I'd pull the rubber boots from the cable ends & check for corrosion. Clean it with a wire brush or sandpaper, coat with dielectric grease & reassemble.
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Old 04-20-2008, 11:26 AM   #63
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to sum it up....i did this.

1. clean ground bus (near each door)
2. replaced o2 sensor
3. replaced MAF
4. cleaned ground (g100)
5. checked for lose wiring and/or grounds.
6. checked voltage of MAF. (got 3v)
7. replaced ECM.

i will test more this morning...i still have to drive it now since i disconnect the battery and reconnected it... i will get back to you.
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Old 04-20-2008, 12:01 PM   #64
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well i went on the test drive and still no luck....it was good for a wile and then it just died...then as i was driving it kept sputtering and almost felt like it was missing or something...but ether way it did not work...i really hope that all this money i have already spent is not just going to wast on things i didn't have to replace

please get back soon
thanks for all you help

jason
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Old 04-20-2008, 12:09 PM   #65
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I'll dig through my FSM'* and do some checks on my 93 for comparison.
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Old 04-20-2008, 12:14 PM   #66
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Where did you have the meter connected when the reading was 3 volts?
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Old 04-20-2008, 12:28 PM   #67
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Disconnect your MAF sensor and let the harness hang.

Start the car, and let it idle for one minute (or longer if your battery needs to charge).

Check voltage from the rear post on the alternator to ground. Tell us what you get.

Check voltage from MAF connector pin A to ground. Tell us what it is.
Check voltage from MAF connector pin A to Pin B. Tell us what it is.
Check voltage from MAF connector pin C to ground. Tell us what it is.
Check for resistance (ohms) from MAF connector pin B to ground. Tell us what it is.

Check voltage at the PCM Pin BD14 (yellow wire) and tell us what it is.

You tell me those numbers, I'll tell you what to rule out and check further.
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Old 04-21-2008, 11:11 AM   #68
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ok first i think you need to be more specific on some things...i must warn you..this it the first time i used a volt meter.

my first questions is...do i keep the car running the whole time i do this?

next "rear post on the alternator to ground" can you be more specific or have a pic or something you can show me?

then...is pin A,B ,and C on the MAF or the MAF harness? is pin C the ground?

if it is the harness i got this..

pin A to pin C....i got 4 volts

pin A to pin B...i got 0 volts

pin C to a grounding point or bolt i got 2-4 volts

resistance of pin B to ground i did not do cuz i am waiting on my ground question

voltage on pcm....this one i did not do cuz i wanted a pic to show me how you were to do it...i don't understand how you would get this if it is plugged in .... do i disconnect it and check the harness or the PCM/ECM? what would i use for a ground for this?

thanks for your help

jason
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Old 04-21-2008, 11:22 AM   #69
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B is ground.

C should be 12V until you pull your PCM fuse. It'* paralleled off the PCM 12v supply voltage from the fuse (now I don't have my manual to tell you....hang on, have a cheapy here.....)

BD14 is in the orange connector on your PCM, yellow wire in slot 14. Read the voltage with it connected, you're just probing inside the pin to see if it'* the same 4v as you read on PinB of the MAF connector (unplugged). It'* the other end of the same wire. I'm trying to see if the PCM is sending the correct voltage to the sensor to begin with, indicating a wiring problem. Please do not read pin A to pin C on the MAF sensor. They are fed from different sources.

Pin B is ground for the sensor. It needs to be read to a good chassis ground (sensor disconnected).

The car can be running or just the ignition on (motor off) if you know your battery is fully charged, but I'd prefer motor running. Make sure your meter is on DC volts for the voltage checks, and OHMS for the ground check.

Again:
Quote:
Check voltage from MAF connector pin A to ground. Tell us what it is.
Check voltage from MAF connector pin A to Pin B. Tell us what it is.
Check voltage from MAF connector pin C to ground. Tell us what it is.
Check for resistance (ohms) from MAF connector pin B to ground. Tell us what it is.

Check voltage at the PCM Pin BD14 (yellow wire) and tell us what it is.
Pin A to ground is the sensor reference voltage, and should be 5V.
Pin A to B is the same reading using the MAF harness ground to see if there'* a difference.
Pin C to ground is the 12V sensor power (used to heat the filament). It'* the same source as the PCM voltage source, and comes from the same fuse.
Checking resistance of Pin B to ground verifies the readings found so far.
PCM BD14 tells us if the Pin A to ground is low, whether there'* a wiring problem or if the PCM is the problem in sending a signal too low to begin with.

I need you to tell me these with NO other combinations. If I'm to help you with your problem from hundreds of miles away, I have to know what these numbers are.

The PCM is located above your RF passenger feet. Remove the hushpanel (plastic sheild under the glovebox area) and find the silver box. The orange connector on it should have a yellow wire in pin 14.
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Old 04-22-2008, 01:25 PM   #70
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ok this what i got....but i dont think i did it right or if i am even using this thing right....

pin A (harniss) to ground i got 12v
Pin A and B (harniss) i got 12v
Pin C (harniss) to ground i got 5v
resistance Pin B (harniss) it was off the chart....

PCM i did not check bcause i need to know what i am grounding it to...i know to check BD14 (yellow wire) but do i just ground it to the door frame or somthing?
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