Topic: hic up

[neale_rs]

In older jeeps a high speed miss was associated with a bad coil.  You may want to check coil and coil wires.

[lanulos89]

ok its back, only happens when its above 50 outside, if that makes sence??

im thinking about changing out my coil, but not sure.  now the jeep has also developed a BAD miss, so i assume its the timing, but jeep you cant adjust timing.  could my timing chain of stretched??  i dont know what else to do, its not like i can scan random parts like OBDII  so im about to just start changing random parts..

please help

[Jeffy]

ok its back, only happens when its above 50 outside, if that makes sence??

im thinking about changing out my coil, but not sure.  now the jeep has also developed a BAD miss, so i assume its the timing, but jeep you cant adjust timing.  could my timing chain of stretched??  i dont know what else to do, its not like i can scan random parts like OBDII  so im about to just start changing random parts..

please help

So did you even try to recover any codes? (*echo*) Not all codes will cause the CEL to turn on but all of them will be stored.

Timing is controlled by the CPS which I mentioned earlier.

[lanulos89]

ive tried codes more time than you guys would like to kno i never tested the sensors, yet.  but wtf would a sensor work right and not right during different temperatures?

[Guardian7]

Hey man, my 98 TJ is having the same issue, it only happens during acceleration and only occasionally like once a day it will pop a backfire and only when hot. I have just swapped the throttle body with a 4.0L keeping only the original AIS, new wires, new plugs, new exhaust/intake gasket. I have a new coil, cap and rotor coming from performance distributors tomorrow. Also I have checked the computer for any error codes. If the ignition parts don't fix it I will do the fuel pressure checks and then the catalytic converter to see if it's starting to clog.

[Sidscan]

Guardian,

You might also consider replacing back to the stock air filter.  The low end is much better since I changed my rockit out for the stock.  My idle also smoothed out.  I have the PD setup and love it.  Not a balls out change but definitly was worth my while. 

[neale_rs]

Coil problems are often related to temperature.  Your last observation on this makes it even more likely.  Good luck zeroing in on it.

[lanulos89]

coil replaced still no luck.  so its safe to assume its not having anything to do with ignition system since evrything is new.   fuel rail pressure is fine, fuel pressure reg. is new so my guess is injectors.  maybe ill do the mustang 19lb injectors

cps is stealership only  item???  autozone or any place like that doesnt seem to carry it???

[Guardian7]

I would go back to the stock Air Filter except the after-market AC unit is in the way making it a problem to mount the stock system. I may try to remount in a new location by building mount bracket for the filter box. Put the new coil, dist cap and rotor on today so now I need to drive it a few days to see if it cured the problem. My next mods will be the 4.0L tbs, jet chip, & electric fan which pretty much does it for the bolt on power mods without getting into any major engine work but I'm sure that will be coming later too.

[Sidscan]

You also gapped the plugs to the .065 right.  You will like it. 

[Tall Boy]

Also, try this: when you are getting drunk with your buddies out in the boonies, your gas tank filler tube is not a good urinal.   

[lanulos89]

haha thanks guy plugs are gapped and nope havent pissed in mytank i have a locking cap jeep came with it, you think ill kow how to unlock it drunk haha

[Tall Boy]

  

[jwrape]

You also gapped the plugs to the .065 right.  You will like it. 

Does gapping the plugs at .065 help with it running rich?  What is the benifit?

[lanulos89]

so how do i test a CPS???