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I have the 3

Tiny
RON TRICKER
  • MEMBER
  • 2004 FORD MUSTANG
  • 92,000 MILES
I have the 3.9 6-cyl, it runs fine but when you are cruising 55-60 and hit a small hill or incline and start to put a load on the engine it will start to cough occassionally and miss, But, if you kick it down and run it hard it has no miss at all. I put a can of Seafoam gas treatment in it with 6-gallon of 92-octane and it helped it quite a bit. ?
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Saturday, December 15th, 2012 AT 2:29 PM

2 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Gas tank additive rarely work. Direct injection of fuel cleaners are the only method that works.

It does sound like an injector issue.

Check fuel pressure.

Roy
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Saturday, December 15th, 2012 AT 4:06 PM
Tiny
RON TRICKER
  • MEMBER
  • 2 POSTS
Can you tell me what the pressure should be, and how to check it, with the engine running, or just with the key on, or what, And I also want to thank you for you answer.
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Sunday, December 16th, 2012 AT 5:53 PM

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