Low power and stall issue - JeepForum.com
 
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post #1 of 7 Old 07-13-2019, 05:48 PM Thread Starter
Seanwilder99
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Low power and stall issue

So my 99 tj with a 2.5 5 speed has been acting up. It started cutting out really bad like the crankshaft position sensor was going bad. No codes tho, I replaced it. Stoped the cutting out. Problem solved right? Well not really. See, ever since I bought it if you lug the motor even slightly it’ll cut out until it gets to the right rpm. I’ve never seen one do this and I’m not sure what to check that would cause it. That problem still goes on. My jeep has also gotten a noticeable power loss since I replaced the sensor. I had to use a Standard ignition sensor since I was headed home from the beach and it was all I could get at such short notice. There’s still no check engine light. Could it be I just need the Mopar sensor? I know these keeps are super picky about what will and won’t work when it comes to sensors. Possible fuel pump? I’m really not sure. If anyone has a idea please let me know.
Thanks, Sean.

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post #2 of 7 Old 07-13-2019, 07:28 PM Thread Starter
Seanwilder99
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Or could this also be a bad throttle position sensor?? What do you all think?
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post #3 of 7 Old 07-13-2019, 09:19 PM
mukluk
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Quote:
Originally Posted by Seanwilder99 View Post
Or could this also be a bad throttle position sensor?? What do you all think?
Test it and find out.
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2000 TJ SE
2005 LJ Rubicon
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post #4 of 7 Old 07-13-2019, 09:30 PM
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Likewise, if you think your fuel pump may be going out, hook up a pressure gauge and check to see if it's within spec or not. Your pump should provide within 5psi of 49psi at the fuel rail when running.

How do your plugs look? Are they gapped correctly?
Have you tried resetting the Jeep's adaptive memory?
Connect a vacuum gauge to the intake manifold and see if anything seems amiss. Observe the vacuum reading as you slowly increase rpms to see if it drops and holds toward zero, indicating a blocked exhaust.

2000 TJ SE
2005 LJ Rubicon
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post #5 of 7 Old 07-18-2019, 08:57 PM Thread Starter
Seanwilder99
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So the fuel pressure is good if I remember it was around 40-43. I’ve reset the computer. I’ve ran my diagnostic tool on it and got nothing then I tried the on board diagnostic and got nothing. I don’t understand. Also I noticed if I’m idling and press the gas it’ll stutter when the Rpms come back down but then clear up and be fine. Bad ignition coil? Bad distributor pick up coil? I’m running out of ideas? Or just the fact I didn’t get a mopar crank sensor
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post #6 of 7 Old 07-20-2019, 09:13 PM
Mmorris88
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Have you figured out the problem? I'm running into pretty much the same thing with my 2000 grand Cherokee limited
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post #7 of 7 Old 07-22-2019, 08:18 AM Thread Starter
Seanwilder99
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Originally Posted by Mmorris88 View Post
Have you figured out the problem? I'm running into pretty much the same thing with my 2000 grand Cherokee limited
I wish. It seems to have settled down a bit, but still unsure. If you find out anything, let me know.
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