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1998 Jeep Cherokee Won't start

Tiny
MILLIONTOM
  • MEMBER
  • 1998 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 175,000 MILES
Hello. About a month ago I noticed my jeep was having a rough time driving at speeds lower than 40 mph. I would get complete engine power loss and if I pressed the gas pedal slightly more the rpm's would bounce up and down from say 1300-1800 repeatedly until I pushed the pedal down further and got it to downshift. Yesterday while driving the engine completely shut off and would not start back up. I recently replaced the TPS. I'm thinking it's probably the crankshaft sensor but I'm looking for some confirmation on my theory. Any help is greatly appreciated.
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Thursday, September 2nd, 2010 AT 10:35 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Have you checked fuel pump pressure? Also, have you checked the IAC?
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Tuesday, December 17th, 2019 AT 7:06 PM
Tiny
MILLIONTOM
  • MEMBER
  • 3 POSTS
I cleaned out the air intake. Have not checked the IAC or fuel pressure. How would I go about doing that?
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Tuesday, December 17th, 2019 AT 7:06 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Here is a how to for checking fuel pressure. You will need a gauge, but most parts stores will lend or rent one.

https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm

As far as the IAC, if you disconnect it while the engine is running, it should stall. If there is no change, it isn't working.
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Tuesday, December 17th, 2019 AT 7:07 PM
Tiny
MILLIONTOM
  • MEMBER
  • 3 POSTS
Thanks for the helpful tips I'll check that out tonight. Do you don't think it has anything to do with the crankshaft sensor?
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Tuesday, December 17th, 2019 AT 7:07 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
It could be; however, it should set a code.
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Tuesday, December 17th, 2019 AT 7:07 PM

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