Engine popping and lack of power?

Tiny
PIRATEJEEP
  • MEMBER
  • 1989 JEEP CHEROKEE
Engine Performance problem
1989 Jeep Cherokee 6 cyl Four Wheel Drive Automatic

Compact size cherokee 4.0L. Seems that anything between idle and WOT is hesitating and popping through the intake only in gear. In park or nuetral seems fine. Already adjusted TPS and have checked plugs, IAC, CTS, MAT, MAP and fuel pressure. Only thing out of spec if fuel pressure. That does not increase with vacuum disconnected from regulator. It is supposed to go up 8-10 psi and does not. So, will that cause a popping and lack of power or do I have some kind of valve problem?
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Wednesday, December 9th, 2009 AT 6:07 PM

16 Replies

Tiny
RASMATAZ
  • EXPERT
Only thing out of spec if fuel pressure. That does not increase with vacuum disconnected from regulator. It is supposed to go up 8-10 psi and does not

This guide will help us fix it

https://www.2carpros.com/articles/engine-has-low-power-output

It suppose to increase w/o vacuum to the pressure regulator-FP regulator is not maintaining the pressure-Hence: When load is increase the fuel pressure should also increase and its not happening
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Friday, January 18th, 2019 AT 6:51 PM
Tiny
DIVER007
  • MEMBER
  • 1989 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 267,000 MILES
The issue is that the wipers front and rear, horn, ac, heat and turn signals all have quite. All else seems to be fine. I have tested the fussible links at the battery and all the fuses. There is no power at the fuse for these circuits. I beleive this would be a fussible link butt were are more or is it possible the ignition switch went bad?

Any input would be greatly appreciated
thanks andy
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Saturday, August 1st, 2020 AT 1:57 PM (Merged)
Tiny
BUDDYCRAIGG
  • EXPERT
All of the things you mentioned get power from the brown wire coming out of the ignition switch.

I see that there is a orange wire that comes out of the switch that powers the windows.

And those two circuits get there power from the same place in the switch,

so if your windows work, then it's got to be the ignition switch.W
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Saturday, August 1st, 2020 AT 1:57 PM (Merged)
Tiny
DIVER007
  • MEMBER
Thank you very much thats what it was. This site rocks . I will definatly share this site with others. And ill be back in the future.

Thanks andy
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Saturday, August 1st, 2020 AT 1:57 PM (Merged)
Tiny
BUDDYCRAIGG
  • EXPERT
Glad to help.
Come back anytime.
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Saturday, August 1st, 2020 AT 1:57 PM (Merged)
Tiny
DACASANOVA
  • MEMBER
  • 1988 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 100,000 MILES
Hello and thank u for ur time I have a 88 jeep cherokee inline 6 that has no power in any of the car I have checked the fuses and the battery is chared and the wires good/terminals clean the car does turn over if I use a screw driver to touch stater to a ground hower there is no lights in any of vehicle ur help will b apreciated
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Saturday, August 1st, 2020 AT 1:57 PM (Merged)
Tiny
BMRFIXIT
  • EXPERT
Did you check the ground wire
make sure you have a good ground at the motor and the truck too
get your self a test light and trace the power
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Saturday, August 1st, 2020 AT 1:57 PM (Merged)
Tiny
TROOPERII4X4
  • MEMBER
  • 1988 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 123,000 MILES
I have just replaced the crankshaft position sensor in my jeep cherokee and it worked fine for a couple of days, then I noticed a sound in the tranny, then lost power after 1100 rpms. Do you think that maybe something could have fell into the flywheel when replacing the sensor and got caught up in it to cause the problem. Right now I have a mechenic who THINKS its the computer and I dont want to spend the money if its not. Any help would be great.
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Saturday, August 1st, 2020 AT 1:57 PM (Merged)
Tiny
AIRSOFTSOLDRECN9
  • MEMBER
What would make you think something fell into the sensor port? It dosen't matter anyway because there is nothing you could put through that hole that could even put a scratch on a flywheel. More than likely the computer is not advancing the timing correctly when you step on the accelerator. The CPS or crankshaft position sensor indicates the electrical signal to break the contacts of the ignition coil to the distributor, thus breakerless ignition system. Basically it is a stator that functions for the computer to measure timing and engine load variables. Power loss would indicate that the timing is not being correctly advanced; the source being a problem with that sensor or the computer.
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Saturday, August 1st, 2020 AT 1:57 PM (Merged)
Tiny
TROOPERII4X4
  • MEMBER
Thanks for the input. I will have that looked at further. I just didnt want to put so much into it if it may have been something else. Again thanks for the help
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Saturday, August 1st, 2020 AT 1:57 PM (Merged)
Tiny
BOLEYCS
  • MEMBER
  • 1985 JEEP CHEROKEE
Engine Performance problem
1985 Jeep Cherokee Four Wheel Drive Automatic 240000 miles

I recently put a rebuilt motor in my Cherokee it is a 2.5 liter Canadian model. The vehicle idles fine but when accelerating it misses and bogs down. The fuel pump (which is OEM standard), and fuel filter are brand new. The carburetor is new I replaced the cat and muffler recently as well. Trying to pin point the problem I replaced the distributer, cap and rotor and plugs and wires. This did not fix the problem. Next I replaced the o2 sensor. The problem still remains. I am stumped. What is causing my jeep to have no power. Acceleration is quicker at 1/4 petal than 1/2 or more.
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Saturday, August 1st, 2020 AT 1:57 PM (Merged)
Tiny
AIRSOFTSOLDRECN9
  • MEMBER
Check the vacuum and centrifugal advance on your distributor for proper operation.
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Saturday, August 1st, 2020 AT 1:57 PM (Merged)
Tiny
BOLEYCS
  • MEMBER
The vacum advance is hooked up and working, the distributor is brand new and the problem existed before I replaced it. =/
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Saturday, August 1st, 2020 AT 1:57 PM (Merged)
Tiny
AIRSOFTSOLDRECN9
  • MEMBER
CPS sensor should do the trick then. It should be mounted on the front pulley or near the bellhousing. What did you set the timing to? You might want to note whether your vacuum advance works under full vacuum or variable vacuum at the carburator.
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Saturday, August 1st, 2020 AT 1:57 PM (Merged)
Tiny
XJBASKETCASE13
  • MEMBER
  • 1993 JEEP CHEROKEE
  • 4.0L
  • 6 CYL
  • 4WD
  • MANUAL
  • 170,405 MILES
I have the vehicle listed above Sport 5sd. It bucks when I’m in gear or off the clutch. Filter is new. Will buck randomly. Check engine light is on throwing code 24. Which is the throttle position sensor code. I replaced with Mopar sensor but it still acts up and does same thing. Have put two different throttle position sensors on it. Have also replace crankshaft position sensor and MAP sensor. Still no change in symptoms.
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Monday, December 7th, 2020 AT 12:11 PM (Merged)
Tiny
SCGRANTURISMO
  • EXPERT
Hello,

OBD1 Direct Trouble Code[DTC] 24 for your vehicle is not a code for the Throttle Position Sensor[TPS], which probably explains why switching two of them out hasn't remedied the situation. In the diagrams down below I have included the DTC list for your vehicle as well as the diagnostic troubleshooting guide for DTC 24 for your vehicle. I have also included guides on how to find opens and shorts to grounds in an automotive electrical circuit. You will need to use a Digital Multi-meter [DMM] to go through this guide, so here is a link below explaining how to use one, if needed:

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Please go through this guide and report back with what you find out.

Thanks,
Alex
2CarPros
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Monday, December 7th, 2020 AT 12:11 PM (Merged)

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