Cranks no start?

Tiny
BASS903
  • MEMBER
  • 1988 OLDSMOBILE DELTA 88
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 122,000 MILES
Now I have a different issue. My son drove and parked the car at a store. It ran fine. He came out and it wouldn't start. It cranks, backfires, tries to start but won't. I replaced the fuel filter because it had a clogged filter right before I bought the car, so I thought it may be the issue. It took a few minutes of cranking, but it started to run then quite after about two minutes.
When cranking it backfires some. I put the old ignition mod back on, still no start. In the process of switching the ignition mods, I forgot to plug it in. The engine cranked over fine, no backfire.

I have fuel pressure, but no gauge to check it.
I have spark on all six coil outputs.

I have not checked the wiring to the cam or crank sensors yet, or any relays or fuses.

It sounds to me it's out of time but ran fine the two minutes it started. Some other posts mentioned that the crank sensors is a known cause.

No engine codes other than 12.
I'm going out to see if I can rig a gauge up and check some wiring on stuff on the heat index drops a little outside.
Tuesday, July 9th, 2024 AT 1:41 PM

4 Replies

Tiny
BASS903
  • MEMBER
  • 5 POSTS
Update. I went to try and rig a gauge up to check fuel pressure and it started right up. Idled great, ran great. I let it sit for 15 minutes and it started right up.

I'm thinking possible fuel pump. I did here it run when the car wouldn't start, but I do know GM and fuel pumps.
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Tuesday, July 9th, 2024 AT 3:39 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,837 POSTS
Hi,

It could be a fuel or ignition related issue. What to do is this. If it happens again, see if the engine will start if you use starting fluid. If it starts and then stalls, we know it is a fuel related issue. I there is no change, then check to see if there is spark at the spark plugs. Here is a link that explains how to check:

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

Try this and let me know the results.

Take care,

joe
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Tuesday, July 9th, 2024 AT 6:59 PM
Tiny
BASS903
  • MEMBER
  • 5 POSTS
When it wasn't running, I had spark at all 6 terminals at the coil pack. The ignition control module is two weeks old.
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Tuesday, July 9th, 2024 AT 7:07 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,837 POSTS
Hi,

It does sound like the fuel pump may be the issue. When you first connected to the tester, was any pressure present?

Also, here is a link that explains how to retrieve diagnostic trouble codes on this vehicle. All you need is a short jumper wire or even a paper clip. This may help us eliminate possible causes.

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Let me know.

Joe
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Tuesday, July 9th, 2024 AT 7:14 PM

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