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Why does my 1991 f 150 with 5.0 not stay running

There is a new fuel filter and new tps and new fuel pressure reg. also tried different ecm with the same results it will start easy but only stay running for a few min. checked the egr with a hand vac pump opened up with less then 10 pounds of vac

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  • steve hintz Nov 06, 2012

    I also don't think there is a mass air flow senor on the 1991 f150 but not sure there also is no check engine light that is on

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  • Contributor
  • 7 Answers

Crank or cam sensor may be going out have them checked with a magnet should fight against each other

Posted on Nov 06, 2012

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Posted on Jan 02, 2017

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SOURCE: CAR WILL START AND RUN FOR A FEW SECONDS THEN DIES

Mass air flow sensor.

Posted on May 13, 2009

MNfisherman
  • 11896 Answers

SOURCE: my son's gmc 4.3l hesitates upon acceleration. I

do you have any check engine lights on? If you do, that is the first thing I would have checked. It does sound like plugged EGR, vacuum leak, or bad TPS

Posted on May 15, 2009

  • 1 Answer

SOURCE: 2000 kia sportage trouble code po171 once in

I have 2005 Kia Sportage with a check engine light. No other symptoms. I was told by Kia and Local mechanic that it is the fuel injectors. Error Code states that Fuel injectors are running lean. Put Master airflow- no change. Ran engine test with propane to run rich and trim never changed from 15. Car runs great. Kia dealer said that this is because we use Ethel in gas that it effects the alumium fuel rail delivery to the injectors and that it is necessary to change all of them .Kia Dealer wants $1,000.00 deposit to place order 6 fuel injectors from Kia. (Has anyone heard of that?)Also put fuel injector cleaner in tank.Does anyone have any suggestions before I spend over $1,000.00 to replace all 6 injectors or possible idea of what could be wrong?

Posted on Jan 07, 2010

  • 79 Answers

SOURCE: 93 mazda mx6 wont run. will start but runs very

If yours is the v6 2.5 the tps is adjustable and you can turn it up and down. On my mazda it acted like it was in the fuel system and i ended up replacing the distributor.

Posted on Feb 06, 2010

  • 632 Answers

SOURCE: 1997 Jetta GT 2.0 Stopped running,cranks,will not start

Checking for spark is really simple while fuel delivery is more complicated because of the the way it is metered for delivery. On VW's a fuel pump relay is used and a jumper cable connected to relay box. This controls the fuel pump to deliver fuel manually. With a fuel pressure gauge connected to the line from the pump continued withing the system, you assess whether you have correct fuel pressure, maintain it within a specif duration. Electronic fuel injectors do stick or stay open causing very poor or no start condition. Make sure you have fuel delivery since you are positive that spark is present.

Posted on May 30, 2010

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2 Answers

1994. Why won't it start?


If the fuel pump/s continue to run with key on, suspect a relay issue. The relay is grounded by the vehicles computer. If the computer supplies a constant ground, the relay will continue to stay closed and power the fuel pumps constantly. If the the ground wire that comes from the computer to the relay is shorted/grounded, the relay will stay energized as well. As for the no start, are the injectors getting a power and ground supply? The ground side of the injector is controlled by the computer as well. Is the vehicle getting spark at the coil/plug? Have you scanned the computer for any trouble codes?

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Clean the throttle plate(back side) and throttle body(inside), brake clean and a tooth brush. Replace the fuel filter. This will take care of your problem. Beware though, since the filter was clogged it could have weakened the fuel pump. This would be the next thing to die.

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hi, I use to have the same problem I had to change engine electrical wires, then I had to change the crank sensor and the module ( destributer ) first let him check the complete wires installation then if they are good let him change the crank sensor

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You don't give the year built, but back when ECM where first introduced it was known that the vehicle would run rough for await till the ECM had time to learn so of speak, by driving on the road. We had to drive down the road a few miles first to get running right on it's own.

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What is the tps and where is the fuel pressure regulator


TPS throttle positioning sensor......Located on the throttle body and looks like this pic attached Top pic is TPS and Other is the regulator



Fuel pressure reg 4.3L Engines
  1. Properly relieve the fuel system pressure.
  2. Disconnect the negative battery cable.
  3. Remove the upper intake manifold.
  4. Remove the fuel pressure regulator retainer clip.
  5. Twist and pull the fuel pressure regulator in order to remove the regulator from the housing using a shop towel to catch any spilled fuel.
  6. Remove and discard the regulator seal O-ring.
  7. Remove and discard the regulator filter.
  8. Remove and discard the regulator seal O-ring.
  9. Remove and discard the backup ring.
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