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Registered
Join Date: May 2001
Posts: 143
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Fuel cutoffs on highway accelerations?
Hi!
I recently changed the fuel filter and the DME relay on my 951. Since then, fuel cutoffs often occur when accelerating hard (full throttle) in 3rd, 4th or 5th gear. It never happens in 1st and 2nd gears. When the first one occurs, the other ones occur even faster and with a bit less throttle. By fuel cut offs, I mean that the fuel pressure drops enough to give a really hard blow, but not enough to stall. If I keep the throttle floored when they occur, the fuel cut off will give repetitive blows staying at about the same speed. Can it be related to a faulty fuel filter or a faulty DME relay? If so, how can I establish the real problem beetween both? Even if it looks like a bad fuel pump, I really don't think that it could have gone wrong EXACTLY when I changed both parts. Thanks alot, Yan 
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08-25-2002, 07:38 PM
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Join Date: Feb 2001
Location: Viera FL
Posts: 5,642
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I would start with anothr DME relay - It just sounds too coincidental.
Failing that, your next step youd be fuel pressure regulator and fuel pressure damper (those canister looking things on your fuel rail.) We know your fuel pump works, the car is running, usually when a pump goes, it just dies. AFJuvat
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08-26-2002, 01:29 AM
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Join Date: May 2001
Posts: 143
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Thanks alot AFJuvat, I'll go in that way!
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08-26-2002, 06:53 AM
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Join Date: Jun 2000
Location: Northern VA
Posts: 639
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Actually, that sounds like you're overboosting and the computer is cutting the fuel off to keep from blowing a head gasket. The first thing to check would be the cycling valve and associated vacuum/boost lines, then the wastegate.
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08-26-2002, 03:53 PM
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Join Date: May 2001
Posts: 143
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Even if the boost gauge often goes right on the 2 BAR line, the cutoff problems often occur at 1.8 BAR or less. Also, the overboost cutoff would always occur when the boost hit ~2 BAR. In this case, it doesn't look like an automatic boost verification (it happens about once every 3 or 4 full throttle accelerations). Can it still be an overboost problem?
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08-26-2002, 04:14 PM
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