Issue With Stalling/Hesitating -
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post #1 of 2 Old 12-12-2018, 08:34 AM Thread Starter
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2000 TJ Wrangler 
Join Date: Oct 2018
Location: Las Vegas
Posts: 1
Issue With Stalling/Hesitating

Hi, I'm a first-timer on here - I've got an ongoing problem with my Wrangler TJ Sahara. It's a 2000 model year, 4.0 auto-trans with 202k miles on it. I've owned it since 2002 when it had 18k miles. It has always ran great until the past year - now it randomly stalls/loses power and I can't find any reason for it. I can drive all the way on the freeway without problem, exit the freeway, stop at a stoplight and then it suddenly stalls while stopped. Other times it stalls while it's in motion. Sometimes it stalls completely and I need to pull over and restart it, other times it just hesitates for a second or two like it's not getting fuel, the RPMS will drop to zero and then it suddenly gets power again and keeps going. Sometimes the check engine light or check gauges light comes on and sometimes they don't. I can drive it all day and never have a single problem, other days it will have issues three or four times in one trip across town. I've had a friend who is a professional mechanic look at it, but have not taken it to the Jeep dealership yet, since I know from having worked at a dealership that intermittent problems like this can cost hours of diagnostic time and a lot of money. I figured I would check on here first.

I've already replaced the fuel pump, fuel pressure regulator and fuel filter (Delphi kit from Autozone), IAC (Idle Air Control) valve, battery terminals, ignition coil pack (late 2000 year distributor pack) and new plugs and battery terminals. I've always changed the oil religiously and also always put in good-quality 89 octane gas. I've also been using a variety of fuel system cleaning chemicals at each refill, hoping that will clear out any blockages or issues but they don't seem to help. I'm not even completely sure it is a fuel issue - maybe something in the engine or transmission?

Any advice would be appreciated!

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post #2 of 2 Old 12-12-2018, 09:32 AM
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jtec's Avatar
2014 JK Wrangler 
Join Date: Oct 2017
Posts: 7,571
knee jerk reaction is CKP - crank sensor.

Might want to SCAN for codes -with a scanner free at part stores. Don;t know till you look.

Let us knnow any added aftermarket BS regarding powertrain..

Common thinking is Sensors such as crank should be jeep only.

If the CEL was on there will be codes.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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engine , hesitating , rpms , stalling , transmission

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