stumbles after warm up

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Oct 20, 2003 | 11:31 PM

djmac

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stumbles after warm up

my 88 460 starts good and runs good for about 20 min to 1\2 hour then it starts to miss and idle rough. the only thing i know that acts up after warm up is the ignition coil. can you guys think of anything else?

Oct 21, 2003 | 01:00 PM

LxMan1

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From: Louisville,Ky.

I May have asked you this before, are you running a closed loop system with an O2 sensor and a map sensor?
Are we talking about your jeep that you have in your siniture or something else?
How does it act above idle?
Jimmy

Oct 21, 2003 | 03:53 PM

djmac

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yes, it is the jeep in the sig. and yes it has both the map and oxy sensor. it has a miss above idle as well. really noticable at light throttle say at 25 mpg and slowly climbing.

Oct 21, 2003 | 11:24 PM

LxMan1

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From: Louisville,Ky.

It almost sounds like an ignition miss. I am thinking possibly the pick-up coil in the dizzy?
No cats to be clogging?
It could be a weak coil breaking down or even an ignition module doing the same.
Usually, the module will just quit though.
I would try the coil first, it's the cheapest.
Jimmy

Oct 22, 2003 | 10:19 AM

djmac

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i think it sound like an ignition miss too. it is similar to when the plug wire leaks. the rotor cap module and wires have been replaced recently but i think the coil is a good guess but i have noticed that the muffler is discolored some believe that this discoloration is caused by a blockage. maybe one of the cats puked into the muffler and obstructed it. i will keep tinkering with it and thanks again for you help.