Jeep will not accelerate past 1500 RPMs
- Thread starter Bobby Ridgeway
- Start date
Am I wrong but I thought the distributor tip dropped into its slot which would allow it to be in proper position or 180 degrees from proper position. No way for it to be one tooth off one way or the other.
Either way when the number one piston is at the top of the head, the rotor in the distributor is at the #1 contact on the distributor cap leading me to believe its in proper position.
I am willing to try anything so I can pull it and attempt to adjust it if you think it will help
I had issues with my boat, and it ended up being the distributor was off a few teeth. Its possible to be off a tooth or more.
Puppypaws55
New Member
honestly you can pull the ECM computer and take it in to be tested just to see if it's failing would know my computer started to fail in my 02tj but it still ran just really rough I had issues with it back firing when starting but my starter also decided to take a dump at the same time
I should also add that if you replaced any of the censors (i.e. MAP, CPS, etc.) with an aftermarket brand other than the OE Mopar sensor, there's a very good chance that they're now faulty (if they weren't already before).
Our TJs are notorious for rejecting electronic components from any brand other than Mopar (OE). Many people go to their local auto part store and buy a replacement sensor and report that it doesn't fix their problem. They swap it out for an OE Mopar sensor, and sure enough, that fixes the sensor issue.
Just a thought.
Our TJs are notorious for rejecting electronic components from any brand other than Mopar (OE). Many people go to their local auto part store and buy a replacement sensor and report that it doesn't fix their problem. They swap it out for an OE Mopar sensor, and sure enough, that fixes the sensor issue.
Just a thought.
I adjusted the distributor one tooth in each direction and it only worsened the problem to the point it would not crank. Once it was placed back to #1 at TDC it would crank (after several attempts). Once running it was same as before. Idles ok but backfires and Boggs down 1,500rpms and higher. You can baby it around and get in 5th gear and up to highway speed but it will not accelerate past 1,500-2,000 RPMs just as before.
Still waiting on the new ECU to arrive in the mail.
Still waiting on the new ECU to arrive in the mail.
Do you think it's worth another $600 to start replacing the duralast sensors with Mopar OE sensors?
I replaced every sensor I could find with a Duralast Gold lifetime warranty sensor from Auto Zone.
Honestly, yes. Those sensors are known to cause issues. So I don't suppose you'll never actually know if it's the sensor or not unless you try the OE ones. It's ultimately up to you, but it helps to rule out a potentially big issue.
Our Jeeps are known to have issues with aftermarket sensor brands. No idea why, but many can speak to this.
Jeepaholic
TJ Enthusiast
Just for the heck of it, do you mind posting a pic of the front section of your exhaust? Your problem really sounds like plugged up cat or exhaust and since you said you have no cat, we have been ignoring plugged exhaust as a possible cause...
Jeepaholic
TJ Enthusiast
Also maybe check out the fuel pressure, possibly it's not getting enough fuel. Personally, I think you are wasting money throwing parts at it. Also, a lot of times not getting enough fuel will not set a check engine light. The only car I ever got a CEL for running out of gas was a bmw, along with a multitude of misfire codes-9 new for every cylinder. Older systems don't monitor fuel pressure.
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I'm not home and will not be back until next week to get that picture and post it.
derekmac
TJ Addict
I second checking the fuel pressure. I had an old truck that acted similar to what yours is doing, and it was the fuel pump.
New ECU came in and didn’t not change the problem for better or worse. I carried my Jeep to a mechanic. The original distributor was cracked and I replaced it with a new one. The mechanic said the new one was also cracked and so he replaced it. He set the timing and found a wire in the wiring harness that was frayed and ground out. New distributor and fixed wire got it running good as new. $90 later I’ve put 100 miles on my ol Jeep and it hasn’t missed a beat.
Thanks for the updating! Sometimes it is something as simple as a frayed wire, it's just not something that happens all that often. I'm glad he was able to figure it out for you, because something like this can be a pain in the butt to chase down.
Thank you for this thread. I just bought a new to me 98 TJ Sport, after a no issue test drive, then purchase drive it 2 mi to title place where it exhibited exactly same issue (idle dropping to 200 rpm, wouldn't go over 1500 rpm in neutral). Mines different however as after I drove it further it's improved to an occasional drop in rpm at stop light, to when I got home 30 mi later it was running like new, no issues. Hmm . Since I don't want it leaving me on side of the trail, I'm starting with the basics. I'll clean the IAC, etc. I suspect a vacuum leak as it got better the further I drove it. (As it warmed up something sealed better?) It is a 4.0 L 5 speed manual with 142000 mi. Mostly stock but owner did advise in addition to replacing exhaust manifold (common prob), said replaced head gasket (why ?). Thanks for a great forum.
Widawg
Widawg
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