Question about 1994 Jeep Wrangler

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My 94 jeep wrangler has a 99 engine in it as I take off in all gears it hesitates and back fires. We checked the injecters and changed the plugs and wires and distributer on it. It is still doing the same thing.

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  • Jeep Master
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99 Engine is OBD-II.

It must match with the same production line ECU.


You may luck out by getting the chip set for the ECU.


Did you purchase the 99 engine,ECU and the wiring set OFF THE SAME Jeep.

The key is to have a matching ECU firmware to drive the injectors and read ALL sensor.

Go to pick and pull and check out few ECU stock numbers and compare to your

==
There is a "S" for stating it's an auto or stick.

The CPS crank position is differnrt between the two.

This can be your major miss-match.

Posted on Jul 15, 2009

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