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2002 Pontiac Montana Repair Question


Topics covered: Spark, Fuel pressure, Battery.
Mileage: 140,000 miles.

Asked on March 28, 2012

My 2002 Pontiac Montana sometimes won't start?

I have spark and fuel in the fuel rail. Have changed plugs and wires, fuel filter and starter. weather does not seem to be a factor. Once the engine is running it runs great. My mechanic says he does not know what it is, he said we would have to start changing sensor.Do you have any ideas?
Avatar Asked by jemfranks

Answer

Replied on March 29, 2012

Are there aney pcm codes. If yes what are thay. We need to know if we are having a spark or fuel. Problem. Check fuel pressure check spark @ the plug on 2 wires. Let me know how you make out.

Tiny Answered by djcl (expert)
788 answers provided
Replied on March 29, 2012

There are no codes, fuel pressure is 50 psi, checked spark on the front three plugs and I have spark on all three.

Tiny Response from jemfranks
1 question asked
Replied on March 29, 2012

Is this what you have when its not starting ?

Tiny Answered by djcl (expert)
788 answers provided

Replied on March 29, 2012

When it is not running I still have spark and 50 psi fuel pressure.

Tiny Response from jemfranks
1 question asked
Replied on March 30, 2012

are injectors working when no start happens?

Tiny Answered by fixitmr
24 questions asked
Replied on March 30, 2012

don't know how do I test.

Tiny Response from jemfranks
1 question asked

Replied on March 30, 2012

You mentioned there is inject or pulse but not if there is spark on the front 3 when not starting. Check this and get back to me

Tiny Answered by djcl (expert)
788 answers provided
Replied on March 30, 2012

noid light is usual test. you can buy or make your own. someone mentioned harbor freight has set for $10

Tiny Answered by fixitmr
24 questions asked
Replied on March 30, 2012

Don't understand what you mean djcl. fixitmr could a bad signal or short for the pcm be intermitant. I'm thinking it might be the injectors because the last time I had a no start I tried to get it started until the battery died and when I took the front plugs out they were dry as mummy dust. You would think after trying for so long they would be wet. Do you agree?

Tiny Response from jemfranks
1 question asked
Replied on March 30, 2012

yes, i would expect them to show wet condition. intermittant no signal/short sounds right.

Tiny Answered by fixitmr
24 questions asked