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Haven't have time. Hopefully we will be able to get to it this weekend.

didn't think about that. I have done it a few times. Thanks!

Will do.

It's over my head.

How would I know if the IP gear is off?

Different trucks. This is the 1998 Suburban.

The truck runs good other than timing. I would think that if it was off by a tooth it would run rough. How would I know that the Dot on the gear is off? I'm thinking that if something is off is could be either the IP gear or the Timing gear. How can I tell which one is off if one of them is off?

I bought the gears about 5 years ago. Just a time consuming build. Not sure how recent the issues with the gears were.

Good question. I will check it the next time we work on it.

This is the 98 DS4. Never noticed it in 7 years. I have always heard it bog down slightly when the a/c is on but the RPM's never fluctuated back and forth continuously while on at idle.

So buttoned everything up and reconnected the downpipe and soot trap (Didn't gut it yet) to see if that fixed everything. Unfortunately it didn't. It stalled out again, so I'm thinking it may be the soot trap still even though the LP and strainer were bad. Disconnected the DP and Soot trap and...

Back at trying to get things timed. Started from the beginning. The actual pump timing is at 30.xx, Desired @ 8.7, metered timing @ 8.7. Shifted pump toward passenger side and the metered went to 5.0. So shifted the pump again as far as it would go and it went up to 7.5. Not sure if this makes a...

Thanks Will. I'll let him know. Where is the hummer run?

Well it looks like the issue ended up being a dirty fuel stock/strainer. Took it off and put a fuel/water separator between the FSU and LP. It appears to be working fine. Don't think it is a clogged soot trap. We'll see in the morning after testing everything out.

What should the fuel pressure be? I has full power or lack thereof since it's turboless for 10 minutes before stalls.

It has a new IP. Issue happened with the old one as well.

Posting this for a friend. He is working a 95 non-military, non-turbo Hummer with a mechanical IP. The issue is the truck will start and drive for about 10 minutes then it dies. Once it cools off it starts right back up and can drive for about 10 minutes again. It has new fuel filter, IP, fuel...

That's a good Thought but why wouldn't my regular one work? It could be bad obviously. I do remember when I bought it there was a red wire ging to a black box the previous owner said was a high altitude something or other. It may have plugged into that.

Started looking at grounds and noticed that the fuel metering solenoid wiring on the IP is different than on my 98 suburban. I have attached a pic of it. There is a red wire spliced to it. There is a spare the previous owner had on the truck as well that is the same. Can anyone tell me why? I...

GMTD. I have done it many times with my OBD2 trucks. This is my first with OBD1. I wasn't even thinking of doing the adjustments to get it to 3 - 3.5 before doing the TDCO. I was seeing 8.0 degrees of timing. Thanks!