Nick's Rolling TGP Thread

cobracmdr · May 30, 2008, 05:26:35 AM

second checking the pressure in the rail with the key on at least 40psi and it should stay at 40 for a few minutes even when you turn off the key.......also.......did you replace the coils and module? If not you might want to try that.........that module can really fuck things up and has burned me on more than a few occasions.

Ken

meltboy11 · May 30, 2008, 05:59:34 AM

hey nick, I got a few extra coils and other shit I could bring with me tonight if you want to check other things leme know.

TGP Nick · May 30, 2008, 12:11:04 PM

I need to find someone that has a fuel pressure tester first.

The only things I did NOT replace were the ICM and coils.

cobracmdr · May 30, 2008, 01:34:31 PM

Where are you guys located? Are you both in upstate NY? I'm in binghamton if you ever need help.

Ken

R Dubya · May 30, 2008, 01:37:36 PM

I found that having a fuel pressure tester is a good thing to have lying around, especially when working on these older Gm vehicles. I got a tester from Advance I think for around $30-$40, used it at least 6 times so it's paid for itself.

The best thing to do would be just to pull a plug and attach the wire, hold it with something insulated near metal and see if the spark jumps. If not, then you know its electrical. Or just go ahead and get a FP tester.

Does is sputter or try to run at all? If it doesn't then first check for spark. Good luck.

R Dubya · May 30, 2008, 01:39:59 PM

I should mention that its a good idea to pull that fuel pump fuse when you do that. If you have spark then its time to test fuel. It's a good idea to check more than one plug though, in fact pull all three of the fronts individually and see what it does.

TGP Nick · May 30, 2008, 01:54:01 PM

It does not sputter or anything.

I am in MN.

bake82 · May 30, 2008, 02:16:15 PM

Nick...just a thought..you did check to make sure both ICM plugs are plugged in? I know it sounds stupid, but my CS quit on me last year out of the blue and it would not start...after searching around, realized the bottom plug on the ICM had worked itself loose....

sounds stupid, I know, but just an idea!

TGP Nick · May 30, 2008, 02:48:27 PM

Alright got home and checked it for spark.. no spark at the plugs.

Then I pulled of each brand new spark plug wire and there is no spark at the coils either. None of the coils have spark.

What am I looking at now?

R Dubya · May 30, 2008, 03:09:20 PM

either the ECM or CS is bad, or the ICM has failed. The easiest way to rule out the other two is to remove the ICM, take it to advance or autozone or a similar shop and have them test it for you. The price is around $125 I think for a new module. If you have a known good spare then swap it in and see if it fixes it.

EDIT:

IIRC there are three electrical connections for the ICM, two on the left side, 1 on the right, this POV would be looking at the engine bay. So 2 plugs on the passenger side, 1 on the drivers side of the coil asm. The easiest way to remove that asm is to remove the 3 13mm bolts and take the coils/ICM out as a complete unit. Easier to install than messing around with 7/32" bolts that hold the coils onto that bracket. There are 3 bolts that hold that asm to the block, one each on the sides and one underneath. Make sure to disconnect the negative terminal as a precaution.

TGP Nick · May 30, 2008, 03:29:30 PM

Alright thanks. I'll attempt to remove the ICM now and bring it to O'reilly's.

cobracmdr · May 30, 2008, 04:05:24 PM

Also do yourself a favor, after you get that icm out the bottom bolt is a bitch to get back in. Take the icm bracket and at the lower bolt slot it, that is cut it all the way through with a hack saw so you can slide it onto the bottom bolt that you can prethread into the block. This makes installing and removing the icm much easier as you can thread the bottom bolt on before you put the icm on then slide the icm bracket onto the bolt, install the top two bolts and then tighten the bottom. Once you take it off you will know what I mean

Ken

meltboy11 · May 30, 2008, 04:10:12 PM

Well I am leavin in a couple hours, I think I have an ICM in the garage, gotta check to make sure, if I can find it I will bring it with me.

the ICM is the piece the coils connect to right?

R Dubya · May 30, 2008, 04:11:09 PM

That's a damn good idea Ken. However if you survey the board, of the people that have removed that assembly 90% of them never even reinstalled that bottom bolt. :laugh:

meltboy11 · May 30, 2008, 04:22:47 PM

ok is this what you need?? I don't know if it works, it came with a bunch of stuff I bought off a member a few months back.