98xj running horrible between 2-3k rpm - JeepForum.com
 
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post #1 of 13 Old 03-24-2020, 02:42 PM Thread Starter
98xjcocoafl
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98xj running horrible between 2-3k rpm

98xj running horrible between 2k-3k rpm
Ok give as much info as I can so I can get the best help... first what it's doing is it starts fine untill I hit 2000rpm then it pops soudders won't rev backfire intake and exhaust sometimes itl catch and hit 3000 rpm and it's fine after that untill I stop hitting the gas and go back under 2000 and starts over...Got the jeep last week had a high idle and ran rough I changed the plugs and wires and the TPS idled right and ran pretty good until I got to the woods it started again took it home cleaned the throttle body replaced the map sensor cleaned the IAC valve still doing it there no cat in it changed the oil still nothing cap and rotor look good only other thing is the plug on the harness side for the pickup in the distributor right at the connector the 3 wires are bare I separate them and taped em up but didn't fix the issue they were touching for who knows how long but didn't change anything I'm at a loss and could use some feedback I'm leaning toward a new distributor and CPS and possibly the coil pack but it's alot of all those things and trying to narrow down the cause. Any input would be helpful thanks in advance

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post #2 of 13 Old 03-24-2020, 02:54 PM
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OK I found the post -

I agree diagnose befor spending.
A 1998 I would start by checkinig codes.
When you go to order the new cat ask if they have a fuel pressure gauge you could rent or borrow. Also they might help with a free scan - we don't know till we look.

That bare harness is likely the CMP cam sensor, A new CMP* and a pigtail should get that squared away.



* It is suggested you use only jeep sensors esp CMP and CKP.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #3 of 13 Old 03-24-2020, 06:47 PM Thread Starter
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I knew I forgot to mention something I did a fuel pressure test and it holds at 49-50 idle and rev no issue there as for the cat this is strictly a trail/mud truck and won't be getting a cat put back in the wires are squared away
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post #4 of 13 Old 03-24-2020, 06:52 PM Thread Starter
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As for codes I got only one for the TPS surprising since it's only been in the woods so I'm stumped I don't come to the forum unless I physically can't figure it out
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post #5 of 13 Old 03-24-2020, 08:42 PM
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being an off road only gives some room for dealing with things.
Explain "the wires are squared away" ?

What are the codes you are getting?
Do you have a scanner?

The problem with power and that RPM range has me thinking CMP and 'sync', the sensor not timed correctly.

How do the plugs look? Wet, black, tan damaged?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #6 of 13 Old 03-25-2020, 04:49 AM Thread Starter
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Plugs and wires are new and I'm not getting any codes anymore no check engine light after replacing the TPS
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post #7 of 13 Old 03-25-2020, 04:50 AM Thread Starter
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Wires are taped off I couldn't cut them and repair them they are right at the clip and are too short to remove the clip and splice together
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post #8 of 13 Old 03-25-2020, 08:21 AM
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Something is confusing -
There is NO o2 sensor after cat - and you are getting no codes?

How did you check ? really hoping yu have a scanner.

FYI you can have codes and the CEL will remain off.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #9 of 13 Old 03-25-2020, 03:04 PM Thread Starter
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Yes I used a scanner the O2 comes and goes now it's hard to start today took awhile to get it to start
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post #10 of 13 Old 03-25-2020, 04:15 PM Thread Starter
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Ok check engine lights on again I don't have a scanner with me and I tried the key dance and trip reset methods to read codes didn't work but.new cranks sensor still hard to get started and still doing the same thing
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post #11 of 13 Old 03-25-2020, 04:18 PM Thread Starter
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Sitting here in it right now after putting in the crank sensor and been trying to start it and noticed it's not reading the rpm when it's turning over but has a brand new crank sensor could it be the pickup in the distributor?
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post #12 of 13 Old 03-26-2020, 01:47 PM Thread Starter
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Idk I'm at a lose ready to completely rip it apart
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post #13 of 13 Old 03-26-2020, 04:02 PM Thread Starter
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Solved... So broke down and bought a new coil and whole distributor coil made it start better but the distributor fixed the issue the teeth are very very thin on it and I beleive were slipping so every sensor is brand new lol but of course it was the last thing I install so for those having some kind of similar issue change out ur distributor before I change everything like I did but I have peace of mind that everything is new time to hit the mud
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