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  Topic Review (Newest First)
12-30-2008 11:35 PM
1991MUSTANGGT I HAVE A 1991 MUSTANG 5.0 I HAVE GT 40 HEADS GT40 UPPER LOWER INTAKE E-303 CAM 70MM THORTLE BODY 24 LB INJECTORS AND MORE I GONE TRY TO DRAIN GAS TOMORROW
12-29-2008 07:17 PM
Beechkid
Re: NEED HELP

Quote:
Originally Posted by 1991MUSTANGGT
PUT SOME 110 RACING GAS IN YESTERDAY CAR WAS RUNNING FINE TO GET IT PUT LIKE 40% IN THE CAR CAME HOME CAR WAS STILL OKAY WOKE UP THIS MORNING TO WARM IT UP CAR BACK FIRED ON ME WOULDNT STAY CRUNK LIKE IT HAD A LATE REACTION WHEN I PUSH THE GAS TO GET IT TO CATCH IDLE BUT IT KEPT BACK FIRING ANY IDEA'S
IIRR, the 91 4.6 was a pretty low compression (9-1) engine and what can happen with racing fuel in a stock engine is there is not enough compression/cylinder pressure to make the fuel burn- the higher the octane shifts the ignition temperature higher than 91 octane fuel. With hte mix of 91/110 you were probably at around 100 but after the refill you were probably raised just above the limits. I would drain what I could, add a pint of acetone to the tank and fill with 87.
12-28-2008 11:31 PM
quick5pnt0 First thing i'd do is fill it up with regular gas to see if that improves things.



12-28-2008 10:59 PM
1991MUSTANGGT
NEED HELP

PUT SOME 110 RACING GAS IN YESTERDAY CAR WAS RUNNING FINE TO GET IT PUT LIKE 40% IN THE CAR CAME HOME CAR WAS STILL OKAY WOKE UP THIS MORNING TO WARM IT UP CAR BACK FIRED ON ME WOULDNT STAY CRUNK LIKE IT HAD A LATE REACTION WHEN I PUSH THE GAS TO GET IT TO CATCH IDLE BUT IT KEPT BACK FIRING ANY IDEA'S

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