No power when gas pedal pressed

Tiny
KIM&ANDYMARTIN
  • MEMBER
  • 1990 JEEP WRANGLER
  • 2.5L
  • 4 CYL
  • 4WD
  • MANUAL
  • 130,000 MILES
Okay, this vehicle will not go up a hill of any kind unless it is in first gear and even then it wants to shut off and I have to pump the gas pedal. We have changed so many parts on it. Did a tune up and atleast four kinds of sensors, ignition switch, fuel pump and fuel filter. We just cannot figure out why it is doing this. It acts as if it is starving for gas. We put fuel injector cleaner in the gas tank and also the sea foam stuff just to clean it all out just in case. I do not know what to do. Please help. Thanks
Tuesday, February 28th, 2017 AT 3:56 PM

3 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 34,331 POSTS
There are a number of things to consider. First of all, has anyone read and recorded the diagnostic fault codes? What about watching what happens to fuel pressure when the problem occurs?

By now you should have figured out replacing random parts is the most expensive and least effective way to diagnose a problem. "Four kinds of sensors" doesn't say what was replaced, or why. When the fuel pump was replaced, was that just the pump and motor, or the complete assembly with the housing? What about the pick-up screen attached to the housing? Has anyone check camshaft timing to see if the timing chain jumped or is loose?
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Tuesday, February 28th, 2017 AT 4:24 PM
Tiny
KIM&ANDYMARTIN
  • MEMBER
  • 2 POSTS
We tried to have the Jeep diagnosed fault codes but it was too old to have that done. How would we go about watching what happens to fuel pressure when the problem occurs? The four sensors that were changed are as follows: MAP sensor, Throttle position sensor, coolant temperature sensor had two of them to change. Those were done because of a friend of my husband had said try the sensors first witch did not help. It seems to do it the worst once it is warmed up too. Everything was changed out when the fuel pump was changed. Hopefully some of this helps you. Thank you
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Wednesday, March 1st, 2017 AT 6:40 AM
Tiny
CARADIODOC
  • MECHANIC
  • 34,331 POSTS
Chrysler makes reading the fault codes yourself much easier than any other manufacturer. If you tried to have them read at an auto parts store, they can usually only read them on the '96 and newer models.

Cycle your ignition switch from "off" to "run" three times within five seconds without cranking the engine, leave it in "run", then count the flashes of the Check Engine light.

https://www.2carpros.com/articles/jeep-diagnostic-trouble-codes-for-car-built-on-or-before-1995-odb1
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Wednesday, March 1st, 2017 AT 6:16 PM

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