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

Car dies in reverse and sometimes in drive

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Old 11-06-2006, 11:57 PM
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Car dies in reverse and sometimes in drive

Car idles fine when in park or nuetral. When I go into reverse sometimes it's ok but then sometimes itll just shut down. IAC is new, TPS is good fuel pump is new fuel filter is new. What am I missing?
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Old 11-07-2006, 08:57 AM
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What are the IAC counts at idle? Is the IAC passageway clean?
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Old 11-07-2006, 09:30 AM
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Sounds like a tuning issue.
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Old 11-07-2006, 09:40 AM
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Originally Posted by Honda Hunter
Car idles fine when in park or nuetral. When I go into reverse sometimes it's ok but then sometimes itll just shut down. IAC is new, TPS is good fuel pump is new fuel filter is new. What am I missing?
Idle it UP.
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Old 11-07-2006, 10:51 AM
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Originally Posted by 1racerdude
Idle it UP.
Check the IAC counts before you just idle it up (these need to stay within spec). This could fix the problem, but it would just be a bandaid.
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Old 11-07-2006, 01:52 PM
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i had a similar problem.. mine was a bad vacuum line off the intake
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Old 11-07-2006, 09:28 PM
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The counts are hard to manage. Nothing I do help to change it. Sometimes it's at 70. The sometimes it's in the single digits.

Ive had everyone look at my tune and theyve said it's ok so far.

Ive tried idling it up with the screw. Doesnt change a thing.

I have looked all over for a vacuum leak but I cant find one. It idles fine in park and sometimes in drive. It's just once you tap the gas itll just die. Car also bucks and studders when taking off (if it doesnt die)
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Old 11-07-2006, 11:20 PM
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The counts shouldn't be hard to manage. Have you checked the passageway? Any sensors not within spec?
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Old 11-08-2006, 07:09 AM
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Originally Posted by Sweetred95ta
The counts shouldn't be hard to manage. Have you checked the passageway? Any sensors not within spec?
I cleaned the passages and most the sensors are new.
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Old 11-08-2006, 09:22 AM
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Originally Posted by Honda Hunter
The counts are hard to manage. Nothing I do help to change it. Sometimes it's at 70. The sometimes it's in the single digits.

Ive had everyone look at my tune and theyve said it's ok so far.

Ive tried idling it up with the screw. Doesnt change a thing.

I have looked all over for a vacuum leak but I cant find one. It idles fine in park and sometimes in drive. It's just once you tap the gas itll just die. Car also bucks and studders when taking off (if it doesnt die)
Did you turn the screw enough to open the blades?
The IAC may compensate at some point.
Is the IAC working?
Have ya checked the fuel pressure?
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Old 11-09-2006, 04:50 AM
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Originally Posted by 1racerdude
Did you turn the screw enough to open the blades?
The IAC may compensate at some point.
Is the IAC working?
Have ya checked the fuel pressure?
Ive turned it alot to the point were it idles way higher than it should. It would still just shut off in reverse. It's wierd because it's not like it slowlly dies or drops in rpms, it just shuts off.
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Old 11-09-2006, 04:56 AM
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How can I test the IAC without a voltmeter? Ive read somewhere you can connect 2 pinouts or something?
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Old 11-09-2006, 07:15 AM
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If the park neutral saftey switch is going bad is bad or faulty wiring to it is it possible the car will shut off when trying to go in reverse?
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Old 11-09-2006, 07:19 AM
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Originally Posted by Honda Hunter
If the park neutral saftey switch is going bad is bad or faulty wiring to it is it possible the car will shut off when trying to go in reverse?
Doubt highly that is the problem since you let the pedal out to idle and it runs fine AND it's intermittent.

My question is has this engine combination ever run correctly?
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Old 11-09-2006, 07:23 AM
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Originally Posted by speedygonzales
Doubt highly that is the problem since you let the pedal out to idle and it runs fine AND it's intermittent.

My question is has this engine combination ever run correctly?
The same combo ran great in my Camaro. All we did was swap motors into my 93. Nothing has been right since then. Right now this is the biggest issue besides the stumbling/hesitation sometimes when driving at low rpm's.
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