LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

another won't start problem

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Old Jun 29, 2006 | 10:29 PM
  #1  
seawolf06's Avatar
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From: Raleigh, NC
another won't start problem

Ok, after getting the cam in and everything else, I adjusted the rockers. With the valve covers and belt off, no coolant, and a huge hole in the #8 header primary where the EGR used to be, the car started right up. Didn't run more than 10-20 seconds cause I didn't want to warp the piston with the header open like that. Tonight I finished installing everything including MSD and wired up the Meziere. Now it won't start. I can hear the fuel pump coming on, there's spark from the coil and from the spark plugs. All the electrical connections are plugged in. I pushed the schrader valve and some fuel did come out, but it didn't spray like my brother said it should with the key on. I unhooked the MSD and reconnected the stock ignition, still won't turn over. The motor cranks, but won't fire up. All the fuses are good. There's still no coolant in the system, but it should still start up since it did before. Any ideas would be very helpful and very much appreciated. Thanks.

P.S. Had a buddy that went to UTI and my brother who's going to UTI look at it and they're stumped.

EDIT: Removed the fuel filter, pressure was good. Removed the fuel lines to the intake, pressure was good. Depressed the schrader valve, pressure was good. Spark from the coil was good, but spark to the plug wires seemed a little weak, but that was only when the car was backfiring a little. I'd say this sounds like a timing issue, but that's not possible, unless the MSD opti skipped around a bit in the past couple days that it hasn't been touched. Tried MSD and stock coils. Tried MSD 6A and stock ignition. Need help soon!

Last edited by seawolf06; Jun 30, 2006 at 12:56 AM.
Old Jun 30, 2006 | 01:14 PM
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Re: another won't start problem

I know I shouldn't double post, but I have somewhat of a different question regarding this problem. Shouldn't the ignition fuse (10A red) on the fuse block under the hood get power whenever the key is in the run position? I was going to use this to power the relay for my wp, but it isn't getting power, but I know the wp works when I wire it into the pcm fuse (10A red) which is always hot. I used this as a reference:

Could a bad ICM cause this and be the reason it won't start?
Old Jun 30, 2006 | 03:24 PM
  #3  
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From: Shawnee Oklahoma
Re: another won't start problem

That particular fuse where the red wire is ran is the EXACT same fuse i had hell with (loose connection) and it didnt let my car fire up....it would just crank
Old Jun 30, 2006 | 03:54 PM
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Re: another won't start problem

How did you fix it?

EDIT: Pulled the box off the mount and wiggle the wire. Now it has 12 volts running to it. Double checked by wiring in the ewp to it, and it runs. Tried a different ICM, same problem, although now it stumbles a little more than before, like it wants to run, but something's "choking" it.

Last edited by seawolf06; Jun 30, 2006 at 04:23 PM.
Old Jun 30, 2006 | 09:56 PM
  #5  
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Re: another won't start problem

Brand new MSD coil seems to be the culprit. Continuously trying to start it flooded the engine and ruined all the plugs. Can I clean them or just buy new ones? What is recommended on here? The ones now are NGK TR55's gapped at the stock .50. With the MSD 6A, should I gap more, less or the same? I hope I can find that reciept for the bad coil...
Old Jul 12, 2006 | 02:38 AM
  #6  
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Re: another won't start problem

Originally Posted by seawolf06
How did you fix it?

EDIT: Pulled the box off the mount and wiggle the wire. Now it has 12 volts running to it. Double checked by wiring in the ewp to it, and it runs. Tried a different ICM, same problem, although now it stumbles a little more than before, like it wants to run, but something's "choking" it.
Mine is just plain popping the fuse. This just happened today, got towed twice today. Sucks. I have no clue what the problem is, everything looks fine. I also ran my reference power wire off the 10 amp ignition circuit but now I want to route that wire somewhere else to eliminate any possibility of that being the problem. Any ideas?
Old Jul 12, 2006 | 07:18 AM
  #7  
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Re: another won't start problem

Gap the NGK's to .035. Did you actually hook up a fuel pressure gauge? You need to see if the pressure is bleeding off and what your fuel pressure is when the key is on. It sounds fuel related, but it's hard to say since I'm not there to see the car in person.
Old Jul 12, 2006 | 07:26 AM
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Re: another won't start problem

Mine is just plain popping the fuse. This just happened today, got towed twice today. Sucks. I have no clue what the problem is, everything looks fine. I also ran my reference power wire off the 10 amp ignition circuit but now I want to route that wire somewhere else to eliminate any possibility of that being the problem. Any ideas?
I assume you are using a relay? I would look for shorts somwhere. How many things are you running off this 10A fuse? What was the last modification before this problem?
Old Jul 12, 2006 | 11:38 AM
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Re: another won't start problem

Originally Posted by White Knight
I assume you are using a relay? I would look for shorts somwhere. How many things are you running off this 10A fuse? What was the last modification before this problem?
Yes, I'm using a relay harness with the water pump. It was explained to me that using the reference power wire into the ignition circuit only takes a few milliamps because it only needs a signal and that by using the pink ignition wire I would be fine. The car has been wired this way for 2 years.

I can take a couple pics and illustrate my wiring for you if that would help.

This is the ONLY thing extra I've run off the ignition circuit. I tried bypassing the MSD box also and that's not the problem either. I also checked all 4 pins in the plug on the passenger side by the fuel rail (pcm to distributor) and according to the book everything's getting the proper power, ohms, etc. over there.
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