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Old 08-07-2012, 05:39 AM
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LT1 problem starting.

I really hope some one out there has seen this problem before. Here is whats going on or not on. 1993 model LT1 put in 55 chevy, car ran great for awhile. was parked and sat for almost 3 yrs. I was going to start finishing it up but when I tried to start it I had problem. put new gas in tank got car started and it ran but it was rough. started to drive it up to shop and it ran for about 100 yards then it shut off just like you turned off Ign. could not get it to restart. It acts like it is flooded, if you unhook the vacume line to fuel rail and hold throttle wide open it will try to start but acts like it is flooded. I have been able to get it to run for a min or two but its blowing black smoke and acting like a carb car with choke on. when engine swap was done for some reason they eliminated the computer hook up except for fuel pump wiring. so needless to say there is no way to get a reading on it. fuel pump is working it has good pressure at bleeder valve. If you hook vac lines back up car won't even act like it want's to start. So short of replacing all the sensors, I hope not cause money is tight. anybody ever seen this problem before or heard of this happening?

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Old 08-07-2012, 06:59 AM
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Is your car sparking at all at the plugs? 3 years of sitting could have let moisture into the opti. Do you have datalogging capabilities?
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Old 08-07-2012, 08:24 AM
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Have you checked the fuel pressure with a guage or just checked that it squirts out fuel? Pressure should be around 40 psi. Also, pull the vacumn line off the regulator and check to see if there's any fuel leaking thru the regulator into the vacum line. '93's are pretty simple compared to '96's, but you still need to scan it before just throwing parts at it. And, yeah, it's probably the opti, but those are expensive now, so you need to check other things first. Also, if it is the opti, stay with AC/Delco...the others are junk.
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Old 08-07-2012, 09:01 PM
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No It doesn't have the capability to get any info out of the Control box. someone cut out the wires to the hookup. why they did that I have no idea. the only wires left on the plugin are for the fuel pump. As far as the plugs go i didn't ck them because it ran when I first tried it but was a little rough. but since you said that about opti I am going to change them out tomorrow. I have been busy on some other stuff and haven't had a chance to do anything to it.
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Old 08-07-2012, 09:10 PM
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No i didn't put a gauge on it just cked to see if i had pressure, I don't think it had anywhere near 40psi cause it only sprayed up about 7 or 8 inches high and it was just a squirt and that was all of it. there was no fuel leaking thru the vac line cause taking it off was the only way it would even try to start. I am going to get back on it tomorrow, starting with dropping fuel tank and ck screen on pump and go forward from there. I would love to find the person who cut the wiring out so you can't hook up to it. I really think I would have to knock his or her stupid butt out.
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Old 08-07-2012, 09:56 PM
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I'd check the fuel pressure with a gauge, if its sitting at 39.5psi or about there it should be fine.

Spark plugs never hurt and at least yours isn't in a camaro (thats a whole nightmare doing plugs), at least read them and see what they are saying.

While your changing, i'd check for spark at the plugs (before and after it dies) and let that be your true check there. If there's nothing take the ICM and Coil and get them tested, if they pass. Check the wiring harness going into the opti and make sure its in good shape (they're only 30 dollars for a new one). Changing the opti on the LT1 sucks, hope that it isn't your issue. Hope its something simple and not the opti for you.

On a side note, if it is the opti, you might be able to swap to the vented unit (helps a lot of the opti issues) while putting one in. I would at least highly recommend this to anyone thats replacing theirs.
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