1999 Jeep Grand Cherokee Laredo

WILLIAM VICTOR NIEDZWIECKI

MEMBER
1999 JEEP GRAND CHEROKEE
6 CYL
353,000 MILES

1999 Jeep Grand Cherokee Laredo. Overnight, my Jeep began to "miss" badly; so I replaced the wires and plugs, but it continues to miss badly. What's wrong? I checked the Generator Field (OK); the Fuel Pump Relay (OK); and the Trans Voltage Relay (OK). What do you recommend?

Friday, January 14th, 2011 AT 5:09 PM

3 Replies

DOCFIXIT

MECHANIC
18,828 POSTS

Check engine light on? If yes have codes read then post. AutoZone will do

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Friday, January 14th, 2011 AT 5:20 PM

WILLIAM VICTOR NIEDZWIECKI

MEMBER
3 POSTS

Unable to read the codes -- the computer(s) were bypassed three years ago by a mechanic in Andrew TX trying to solve a similar (but not quite) problem (that was eventually determined to be the use of synthetic oil). Any other suggestions?

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Friday, January 14th, 2011 AT 7:31 PM

RIVERMIKERAT

MECHANIC
6,110 POSTS

The computers were bypassed? I'd recommend putting them back into the control loop and going from there. Missing can be caused by a bad coil, ignition pickup, control module or problematic valves. If the control modules are bypassed, the problem is probably in the pickup inside the distributor.

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Tuesday, March 22nd, 2011 AT 5:02 AM