Loses power for a couple seconds

[SJRTX]

Sometimes, but only when the jeep is cold after sitting for a while, it loses power shortly after taking off. No hard starts, and it runs smooth. Ill crank it up, and drive about 100ft each time, and suddenly power takes a dive. Giving it more gas while this is happening doesnt really do anything. Letting my foot off the gas, and getting back in it seems to wake it up fine. After it does it, thats it-it wont do it anymore. I could drive it for hours and it wouldnt do it. And it doesnt do this on every cold start, just about 30-40% of them, but it only happens when cold. And when I say cold, I mean the motor hasnt run in a couple hours or more.

Any Suggestions?

[XJING]

What year XJ? Check all your grounds, motor to chasis, battery to motor, I have one I put in battery to chassis, The next thing is a long shot but its obviously a short that once it gets warm it doesn't do it any more, Clean the connection on your CPS( the one in the engine compartment) and check to see that the CPS wire has no burns in it from the motor. I had a burn in my CPS wire that would fix itself as it got warm. Good Luck,

[ttocsnekia]

had a similiar problem, ran some injector cleaner through adn fixed it.

[SJRTX]

Sorry about that, its a 1996 4.0L with 165k miles. I have run fuel system cleaner through it recently, it made no difference.

BTW-CPS? my mind is drawing a blank, help me out here.

[orangegilly]

I just had a similar issue, and it was the crank position sensor (CPS). $50-60 bucks, and about a half-hour job start to finish. Less, if the bolts were easier to reach.

[SJRTX]

Oh ok, yeah, I just replaced the crank position sensor a couple months ago with a Bosche unit. The problem was there before and after the new crank position sensor.

Could a bad MAP be causing this?

[jsk2052]

mine does it too but only if i dont give it enough time to warm up after a cold start

[XJING]

Clean the connector for the CPS. And check to make sure the wirng isn't burnt anywhere. Good Luck.