Antichrist
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- Joined
- Jul 27, 2011
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I've spent the last week or so searching anything I can find, and am still unable to find the cause of my problem so I figured I'd post for some input.
1995 Tahoe Non-Vortec 5.7
Ever since I bought the truck it seemed to take longer than "normal" to start. About 3-5 seconds of starting before it fires.
Recently, on 2 occasions I ran into an issue where the truck would not start at all. Once, I gave up... the other time I was able to get it to start after repeatedly attempting to start the truck. This took about 10 minutes.
I checked all underhood fuses and relays for corrosion. I pulled them all, sanded the terminals of the fuses to expose clean metal, and reinserted them. Relay terminals looked brand new. After that, the truck started better than ever 1-2 seconds crank time TOPS.
At this time I also pulled fuses, one at a time and tried to start the truck, to try to reproduce the no start symptoms I experienced, and one way to replicate it was by pulling one of the ECM fuses (i forgot which fuse it was exactly, off the top of my head..)
Now 3 days later, I'm back to 3-5 second start times, and I'm pretty sure, there's a no-start condition in my near future.
With winter coming I'd like to get this problem diagnosed, and fixed to avoid being stranded in 0 degree weather.
Battery and starter are perfect. It cranks strong every time. And I've never had a weak start.
So I'd think ignition/fuel.. But the truck starts 99% of the time... So I obviously have spark and fuel. At least I do 99% of the time..
And pulling the ECM fuse isn't that big of a deal since no spark/no fuel would cause the exact same thing, crank and no start...
What can I check to locate the intermittent issue before I start randomly throwing parts at it?
EDIT: I forgot to add, that once the truck has been started and runs, it starts fine with no issues afterwards, only about a 2-3 second crank time to start. It's just the initial cold start that's giving me a problem.
I have also had some issues recently with the truck at red lights, stalling, but easily starting back up. I replaced the MAP sens about a week ago, and the problem hasn't come back, but I thought I should mention this just in case there's some relation.
1995 Tahoe Non-Vortec 5.7
Ever since I bought the truck it seemed to take longer than "normal" to start. About 3-5 seconds of starting before it fires.
Recently, on 2 occasions I ran into an issue where the truck would not start at all. Once, I gave up... the other time I was able to get it to start after repeatedly attempting to start the truck. This took about 10 minutes.
I checked all underhood fuses and relays for corrosion. I pulled them all, sanded the terminals of the fuses to expose clean metal, and reinserted them. Relay terminals looked brand new. After that, the truck started better than ever 1-2 seconds crank time TOPS.
At this time I also pulled fuses, one at a time and tried to start the truck, to try to reproduce the no start symptoms I experienced, and one way to replicate it was by pulling one of the ECM fuses (i forgot which fuse it was exactly, off the top of my head..)
Now 3 days later, I'm back to 3-5 second start times, and I'm pretty sure, there's a no-start condition in my near future.
With winter coming I'd like to get this problem diagnosed, and fixed to avoid being stranded in 0 degree weather.
Battery and starter are perfect. It cranks strong every time. And I've never had a weak start.
So I'd think ignition/fuel.. But the truck starts 99% of the time... So I obviously have spark and fuel. At least I do 99% of the time..
And pulling the ECM fuse isn't that big of a deal since no spark/no fuel would cause the exact same thing, crank and no start...
What can I check to locate the intermittent issue before I start randomly throwing parts at it?
EDIT: I forgot to add, that once the truck has been started and runs, it starts fine with no issues afterwards, only about a 2-3 second crank time to start. It's just the initial cold start that's giving me a problem.
I have also had some issues recently with the truck at red lights, stalling, but easily starting back up. I replaced the MAP sens about a week ago, and the problem hasn't come back, but I thought I should mention this just in case there's some relation.
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