Question about 1994 Jeep Grand Cherokee

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A rough ride.

I have a 1994 Jeep Grand Cherokee. I replaced the spark plugs, wires, distributor cap, and rotor. I don't think the Cap and Rotor have ever been changed before now, by the look. Anyway, I've checked and double checked the firing order, and all of the wires are on their connections firmly. It idles and accelerates smoothly, but backfires and runs rough once it's up to speed. Any suggestions?

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Check your engine codes. Even though the light may not be on, there still may be a code that has popped up in the OBD. One way you can check yourself is go to your car and with out starting the vehilce, turn the key on and off five times in a row continusly. After the fifth time, the check engine light should flash. Watch and count as it flashes. Its like morse code. It will flash a certain number of times then pause for a split sec and flash again. Then the light will stay off for a few more seconds and if there is another code, it will repeat the flashing sequence mentioned above with the next code. If you have a digital odometer display, sometimes it will digitally display the code along with flashing the engine light.

Two codes most commonly seen everytime you test is 12 which means in the last 50 times the car has started the battery has been disconnected. The other code is 55 which means that all the codes that are active have been displayed and its done.

If any other codes besides these two come up, take your car to Autozone and have them scan the car with their scan tool. Then they will help pinpoint you in the right direction.

Out of curiosity, has the transmission been changed lately?

Jason

Posted on May 10, 2010

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