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post #3 of Old 12-29-2008, 07:17 PM
Beechkid
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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.

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