1997 Ford Mustang Cobra Logo

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Posted on Jul 03, 2017
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1997 Ford Mustang GT. Spits and sputters. Replaced fuel filter and ran fine for a day(350miles). Spits and sputters again. Fuel pressure 32 at idle, 36 with ignition on no idle. 42 with vacumm line off regulator. Pinched return hose and pressure rose sharply with vacumm. Pinched again w/o vacumm no rise in pressure. Dies off at 4000k spits and sputters to 3500, clears then dies off at 4000K+. What could it be?

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Paul Bade

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  • Master 1,818 Answers
  • Posted on Jul 03, 2017
Paul Bade
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Check for a vacuum leak or poor vacuum regulation.

Also, check the fuel filter again. You may have somehow picked up a load of sediment in the fuel and the new filter is already clogged. If you have a way to siphon a sample of fuel from the bottom of the tank you may see this in the sample (perhaps you can get useful information by looking at the fuel from the inlet line to the filter).

A leaky fuel return valve in the regulator could be dropping the pressure more than it should.

Worst case would probably be a bad fuel pump that is too worn to maintain adequate fuel pressure.

Bogdan Odwazny

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  • Ford Master 6,171 Answers
  • Posted on Jul 03, 2017
Bogdan Odwazny
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Did you do any tune-up?wires? coils?

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SOURCE: my ford ranger idles low and spits gas out the exhaust

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First confirm it is either gas or eastter. Wayer/condedste collects at the tail oip as a byproduct of the caralyctic converter on cold rngine It normally occurs on firts start of a cokd enginw. the ebgine idles low because it is col, but should reyutn to normsl after warm uo.. If for sure iys gasolinem and the engine runs eiygh, then angihector is bad, good luck. I hope this helped yyou

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  • Posted on Jan 27, 2010

SOURCE: My 1998 ford mustang v6 3.8l .. is hard to start

So what you saying is it's hard to start cold right? Something in computer system not allowing excess fuel to injectors when cold. Probably sensor Get auto electrician to sort it out otherwise you end up replacing things that there is nothing wrong with They got the right gear

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