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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Problem Lt1 Idles and will not acclerate

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Old Apr 1, 2009 | 09:34 AM
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Default Problem Lt1 Idles and will not acclerate
I have been working on a 94 lt1 Z28. When I got the car it had been sitting for a year and would not run. The car had spark but very weak. I replaced the ICM, Coil, Plugs, wires and the Opti. The rotor inside the opti was melted. Now the car will fire right up and idle.But the car will not take the gas. When you give it gas it just does not rev-up. It doesnt die out it does nothing. It is really weird any help would be appreciated. BTW It also had dead gas in the tank and I drained the tank and and put in new gas. And fuel pressure is about 40.
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Old Apr 1, 2009 | 09:46 AM
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im no expert but injectors might be gummed up with the bad gas
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Old Apr 1, 2009 | 11:17 AM
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So you hit the gas, tb blades open...and nothing?
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Old Apr 1, 2009 | 11:35 AM
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This may seem a bit obvious, but have you checked the throttle cable?
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Old Apr 1, 2009 | 11:37 AM
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Originally Posted by Zebisko
This may seem a bit obvious, but have you checked the throttle cable?
That's kinda what I was getting at when I said TB blades open.
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Old Apr 1, 2009 | 11:54 AM
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Yes Throttle blades are opening.
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Old Apr 1, 2009 | 11:56 AM
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Originally Posted by djjab57
im no expert but injectors might be gummed up with the bad gas
I concur.

Is the engine idling normally? (no pings, clicks, etc.)
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Old Apr 1, 2009 | 11:58 AM
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Originally Posted by IH8FORD
Yes Throttle blades are opening.
If the TB blades open and NOTHING changes, something is wrong (but you knew that already). When more air is allowed to enter, not matter from where, the rpm should change. Never heard of that happening, don't know what you should check on first.
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Old Apr 1, 2009 | 12:06 PM
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Yeah I have built a few of these cars and this one is kickin my butt. when I give the car as it seems to raise the idle slightly even when you floor it.
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Old Apr 1, 2009 | 12:13 PM
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Originally Posted by IH8FORD
Yeah I have built a few of these cars and this one is kickin my butt. when I give the car as it seems to raise the idle slightly even when you floor it.
I guess you could try pulling the rail and see if the injectors are firing properly.
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Old Apr 1, 2009 | 12:34 PM
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Going to pull the injectors and sees what I have.
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Old Apr 1, 2009 | 02:44 PM
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Well I swaped out the injectors didnt make any difference.
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Old Apr 1, 2009 | 03:00 PM
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Originally Posted by IH8FORD
Well I swaped out the injectors didnt make any difference.
Check TPS maybe?
Do you have access to a data logger?
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Old Apr 1, 2009 | 03:11 PM
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clogged cat?
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Old Apr 1, 2009 | 03:44 PM
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I cut the pipe at the cat. I replaced the injectors, map, MAF I have good fuel pressure . I replaced the computer and the TPS.
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