Someone please give me some advice! - 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 10-04-2004, 06:33 PM   #1
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Default Someone please give me some advice!

I picked up a chiltons bonneville book today and was looking at the codes I pulled.

17- Spark Reference Circuit
18- Cam/Crank Error
34- MAF Sensor low voltage
42- Ignition Control Circuit
53- EGR Problem

With these codes could someone tell me what would be the problem with my car not starting. Like I said before the car cranks but won't fire. I'd say it'* either the crank sensor, the cam sensor, or the ignition control module. I had the ICM tested and it came out fine so it may be one the sensors. Should I replace both sensors while I'm working in the same area? Give me some advice before I go part shopping.
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Old 10-04-2004, 06:40 PM   #2
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I don't know which one is the problem, but the cam sensor is easier to replace. When you have it off, turn the engine over with a wrench on the crank pulley bolt and look through the hole for the sensor. Keep turning until you see a black round magnet on the cam gear or a hole. If you have a hole, you need to get a new magnet on there.

The crank sensor is covered by the crank pulley, and therefore more of a pain to get to. Either of these could stop the car from starting, I believe.

I would say the 34 is unrelated, as well as the 53.

Dare I say you have a bad computer?
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Old 10-04-2004, 06:53 PM   #3
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I would imagine it'* one of the sensors. The cam looks more easier like you said. The crank looks like a pain. I guess I'm going to get both sensors and try the cam first since it'* the easier one and if that doesn't work then I'll go ahead and install the crank while I got the wheel off. Having this book helps me out telling me exactly where they are located.
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Old 10-04-2004, 07:39 PM   #4
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You can clean the EGR valve to fix that problem. Do a search here for the procedure. I'll get a Techinfo up on it this week. Make sure your MAF sensor is actually plugged in.

And on the computer (PCM) idea.....you might want to make sure all the connectors on the PCM are seated properly. Maybe disconnect and reconnect each one.
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Old 10-04-2004, 08:27 PM   #5
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Dare I suggest it be out of time?

I am not sure of the tolerences of the valves, and pistons. But if that jumps 1 tooth you can forget getting it started, no matter what codes are thrown.

My 91 sse ran for years with out a cam position sensor.
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Old 10-04-2004, 08:38 PM   #6
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I seriously doubt it'* out of time, but it obviously thinks it is. That'* the purpose of the sensors. If you're doing the cam sensor, you might as well do the timing chain and sprockets as well.
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Old 10-04-2004, 10:00 PM   #7
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The car, as string said, can run without a cam sensor. It goes off the 'last known good' position. The crank sensor is another story.
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Old 10-04-2004, 10:14 PM   #8
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code 42....ignition timing circuit...located under the coils.....
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Old 10-04-2004, 11:40 PM   #9
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Does the Chilton'* have a wiring diagram? Could all of those parts receive their voltage from a common source? I had a vehicle a few years back that wouldn't start that caused some real diagnostic headaches for a while, and it threw several codes that seemed to be unrelated. I found that one sensor had shorted, removing the voltage from the others. In that case, it was the fuel tank pressure sensor, which you don't have, but you may want to check the supply voltages. If low, when you unplug the bad sensor, the voltage to the others should come back up to normal.
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Old 10-04-2004, 11:43 PM   #10
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Quote:
Originally Posted by int_53185
code 42....ignition timing circuit...located under the coils.....
No. The part you're describing is the Ignition Control Module. And a single component cannot be a circuit.
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