2001 rough idle, tired everything I could find
03-05-2022, 09:39 AM
#16
Newbie
Thread Starter
Well I sprayed propane all round the intake and it made no difference. Pulling the injectors just causes a dead miss and I couldn't really tell any difference from pulling one to the next. I don't think the engine is missing that much, just something is making it shake a lot. When ever my foot is off the throttle, it shakes. Cold, hot, coasting down the road, if I'm not pressing the throttle, its not running right.
03-05-2022, 09:44 AM
#17
CF Veteran
You cant tell what the base timing is without the crysler scan tool because the computer controls all of that but moving the cam sensor definitely changes the timing. I had it come loose on the highway and it rotated about 20 degrees and killed the engine.
I would agree that they probably should be synced but as far as I can tell, the only people around here that can do that is the dealer. I'd rather not pay them to do that and not have it fix this issue.
I would agree that they probably should be synced but as far as I can tell, the only people around here that can do that is the dealer. I'd rather not pay them to do that and not have it fix this issue.
03-05-2022, 09:50 AM
#18
CF Veteran
03-05-2022, 10:01 AM
#19
CF Veteran
Time to think out of the box...
MIL light burned out?
03-05-2022, 10:15 AM
#22
CF Veteran
2000+ uses all 4 oxygen sensors to determine fuel mixture so maybe wait till you get ELM327, read the O2 sensor voltages and see what shakes (LOL!) out.
03-05-2022, 10:23 AM
#23
CF Veteran
But it sure sounds like vacuum to me (too). Did you check everywhere? Brake booster? Some of those tubings that disappear into oblivion?
03-19-2022, 10:54 AM
#25
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Model: Cherokee (XJ)
I have a rough idle too when warm and it gets worse when in gear. What are you thinking that means.
Don't mess with the timing advance. Leave it at the factory spot.
Aside from the injectors and spark plugs, what all is new?
O2, plug boots, motor mounts? (the sorts of things you should have put in new when you swapped the engine)
Does it get worse when you put it in drive and are stopped?
Did you clean up the ground points?
Are there any codes?
Do you have access to a code scanner that reads live data?
Aside from the injectors and spark plugs, what all is new?
O2, plug boots, motor mounts? (the sorts of things you should have put in new when you swapped the engine)
Does it get worse when you put it in drive and are stopped?
Did you clean up the ground points?
Are there any codes?
Do you have access to a code scanner that reads live data?
03-19-2022, 11:26 AM
#26
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Join Date: Dec 2017
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Year: 1989
Model: Comanche (MJ)
Engine: 4.0
I looked at some review sites and bought a Tonwon brand (same as V-Link) BLE 4.0 Bluetooth reader last week and it works perfectly with all my vehicles with "car scanner" and "torque light".
Meanwhile, the cheap $20 Centech reader from Harbor Freight still works fine to pull codes, and gets loaned out quite frequently.
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