a lilitle rough every 40-50 mile and only when hot

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10-18-2013, 01:55 PM

pwb

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Year: 1993

Model: Grand Cherokee

Engine: 4.0L I6

a lilitle rough every 40-50 mile and only when hot

Hi, every 40-50 mile and when hot the engine goes a litle rough a second or two. Its like one or more plug cables ar off. Its not a big problem, but it has happend 4-5 times. I have new rotor, plugs and cables. Could it be the coil? Its all mechanical so if something is wrong it must be the rotor, rotorcap, coil or cables?

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10-19-2013, 01:08 PM

dave1123

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Year: 2000 XJ Sport & WJ Laredo

Model: Grand Cherokee (WJ)

Engine: 4.0L

Another cause of a misfire is an injector. You could have one hanging open sporadically, or not opening.

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10-25-2013, 09:28 AM

pwb

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Year: 1993

Model: Grand Cherokee

Engine: 4.0L I6

today i got error code 27 Fault in injector driver interface circuit. Stopping the engine and start fix the problem. Yesterday it was much rain and cold today (ice), could there be some moist problem? what about code 27, is it injector or the ecu?

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10-25-2013, 09:30 AM

pwb

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Year: 1993

Model: Grand Cherokee

Engine: 4.0L I6

hm, since igot 784 injectors and have some adapters to the connectors, could it be that simple that there is something with that? How is code 27 checked from the ECU side?

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