Dies when clutch is pressed in - Chevelle Tech
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post #1 of 7 (permalink) Old May 5th, 09, 9:43 AM Thread Starter
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Dies when clutch is pressed in

I am totally stumped here!!

I have a Jeep with a SBC 327, mild/decent cam, manual trans, and a Holley Commander 950 TBI system. I run a full exhaust with a Catalytic converter as well as an HEI.

It was running just fine for a long time, (I just got this from a friend). Suddenly it started to die when disengaging the clutch to slow down.

- I changed the fuel filter and flushed the fuel lines w/ compressed air(thought it wasn't getting gas).
- Changed the ENTIRE ignition system (it was old and wanted to upgrade, plus I wnated to esure it was in good working order).
- I had the Holley ECU reflashed (my laptop wouldn't connect to it, firmware/software issues).
- I drained the fuel tank and refilled with fresh gas (thought there may have been water in it or just been bad gas).

It first started when I was about 45 minutes from home...it seemed to be OK on the trip back home...over time it got so bad I could only go about five minutes down the road...now I can't even get to the end of the block!!

Only thing that comes to mind right now is the Cat may be plugged or something...can't imagine why though. There seems to be plenty of fuel pressure at the TBI, I don't have a way to check it though.

Anyone have any other ideas...maybe experience with the Commander 950...Any help would be greatly appreciated!!!

1968 Malibu, Medium Spiral Grey Metallic With White Ice Clear Coat. Fully Kustom Black and Grey Interior. 383cid SBC (cracked block...FML), TH-350, 4.56-10 Bolt.
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post #2 of 7 (permalink) Old May 5th, 09, 10:19 AM
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Re: Dies when clutch is pressed in

Bad ground?
Losing the electrical connection when the clutch is not engaged?

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post #3 of 7 (permalink) Old May 6th, 09, 9:55 AM Thread Starter
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Re: Dies when clutch is pressed in

Grounds are good...been checked and cleaned twice by two people.

Losing a connection when clutch disengaged makes no sense to me. It's not like there are wiers hangin down around ny cluthc linkage or something. And it fires right back up when you pop the cluthch. But runs like crap after words.

1968 Malibu, Medium Spiral Grey Metallic With White Ice Clear Coat. Fully Kustom Black and Grey Interior. 383cid SBC (cracked block...FML), TH-350, 4.56-10 Bolt.
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post #4 of 7 (permalink) Old Jun 2nd, 09, 10:52 AM Thread Starter
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Re: Dies when clutch is pressed in

I've got it narrowed down to the TBI tuning.

A coupl sensors have been replaced, may still need to change the O2 sensor.

Anyone in SOMD have experience tuning a Holley TBI system that can help me out?

1968 Malibu, Medium Spiral Grey Metallic With White Ice Clear Coat. Fully Kustom Black and Grey Interior. 383cid SBC (cracked block...FML), TH-350, 4.56-10 Bolt.
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post #5 of 7 (permalink) Old Jun 2nd, 09, 12:45 PM
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Re: Dies when clutch is pressed in

a good way to check the cat is to remove the o2 sensor in front of it, then drive it.

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post #6 of 7 (permalink) Old Jun 2nd, 09, 4:14 PM
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Re: Dies when clutch is pressed in

you can check the convertor by using a vacumn gauge you should have about 30 inches at a good port in manifold
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post #7 of 7 (permalink) Old Jun 21st, 09, 5:46 PM Thread Starter
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Re: Dies when clutch is pressed in

It is a tuning issue. i have it somewhat fixed.

when slowing down and suddenly geting off the gas, the RPM drops about 300 under idle speed, then catches back up. that was the problem, RPM drops too low and dies. BUt no I have to have the idel up around 1100, it runs fine but still needs work.

1968 Malibu, Medium Spiral Grey Metallic With White Ice Clear Coat. Fully Kustom Black and Grey Interior. 383cid SBC (cracked block...FML), TH-350, 4.56-10 Bolt.
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