1989 Ford F-150

Tiny
MELVIN KNIGHT
  • MEMBER
  • 1989 FORD F-150
  • 6 CYL
  • 2WD
  • MANUAL
  • 75,000 MILES
I bought this truck new. Great vehicle. 75,000 orig miles. A new front gas tank was installed 6 months ago. Immediately there were problems. The mechanic insisted on replacing the computer module. Nevertheless when it warms up, it sputters, makes air noises, knocks and dies. After it cools down it will run again. It recently died in a major intersection and was towed to a Ford dealer. I don't think they know what they are doing. $900 for a new battery, starter, spark plugs, wires, roter and distributor cap and it had nothing to do with the problem. Now they are trying to tell me it needs 2 new fuel pumps at $1275. I think there is dirt in the gas tank. They disagree. Also, an elctronic problem is possible. The only thing not replaced is the coil. I m not a mechanic but I was mistaken when I assumed the dealer would best be equipped to get to the problem. Any suggestions would be much appreciated.
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Thursday, September 10th, 2009 AT 4:33 PM

3 Replies

Tiny
SERVICE WRITER
  • EXPERT
A dealer is only as good as it's techs and how they compensate them. Sounds like a whole lotta guesswork on that one. Battery and starter are certainly not related to the symptoms. 2 fuel pumps. No way. Highly unlikley anyway.

Do you know if any codes are present? If so what are they.
When the symptoms start, is there a glow to the converter at all?

Explain the air noises. Hissing? Can you locate the noise source by ear?
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Friday, September 11th, 2009 AT 7:24 AM
Tiny
MELVIN KNIGHT
  • MEMBER
Thanks for your prompt response. The service attendant tells me "the mechanic checked it out." He says "a pressure test probably revealed poor pressure." Since the truck got a new front gas tank six months ago, I early on asked if there was the possiblity of dirt in the tank. The answer was "highly unlikely." I aksed about the gas line filter. Answer "we are going to change that too while we are at it." They want to change the miidship fulel pump and the high pressure fuel pump at the same time. The truck has a rear gas tank which I have not used for a while since I ignored a recall notice for a faulty switch. The switch is now replaced so when the truck died this past time, I switched the tank from front to rear and there was no difference. The noise is a hissing noise. It sounds a lot like air pressure. The noise is sporadic as the engine chokes, coughs and usually just dies. If you pump the gas pedal, sometimes the truck seems like it wants to run and sometimes it just cuts right off. You can't make it start unless it sits for about 15 minutes. Then it will start but only run a few minutes until it gets warmed up again. When its cold it runs fine. I just find it hard to believe that a fuel pump (or in this case 2 ) reacts to temperature. My brother-in-law has been a mechanic for about 25 years. He thinks it's a coil. I asked the dealer, the response was not likely. I bougt a coil for $20.00. Even I can replace it. Since everything but the coil was just replaced, why not replace it in any case. My brother-in-law thinks it's an electronic problem of some sort in any case. A major computor module was also replaced, so it's not that, but there is another computerized component attached to the distributor that he thinks could also be the problem. Thanks again, what do you think?
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Friday, September 11th, 2009 AT 11:19 AM
Tiny
SERVICE WRITER
  • EXPERT
You can use a hair dryer on the coil to heat it up when the truck is cold. This can help confirm if heat and the coil are correct.

A fuel pressure gauge can be run up to the windsheild and then driven. When the symptoms appear, the gauge can be monitored for a pressure loss.
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Friday, September 11th, 2009 AT 12:08 PM

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