4.0 TURNS OVER NO SPARK

2000 Jeep Wrangler

Tiny

Reagan78757

August, 8, 2010 AT 5:09 PM

Engine Performance problem
2000 Jeep Wrangler 6 cyl Four Wheel Drive Automatic 97000 miles

My son and I replaced the 4.0 engine in his 2000 Wrangler Sport . It was running when we parked it to swap the engine with a rebuilt. With the new engine it turns over but does not start. There is fuel. There is no fire from the No. 1 plug wire. It was showing No bus on the odometer, fuel gauge, and volt gauge were inoperable. I switched a couple of the relays (ASD and something else) and the no bus went away, gauges started working. I switched the relays back and the "no bus did not return, gauges continued to function. However the engine still turns over, but will not start. It has a new coil pack. There is small relay that is grounded to the block just above the oil filter. The wire kept coming out of the relay plug so I put a new terminal on it and cleaned the ground connection.


http://www.2carpros.com/forum/automotive_pictures/559432_Right_side_of_engine_off_of_internet_site_1.jpg

I feel like we have not put a wire or connection, something, back like it belongs. Any ideas? Thank you.

FOUND 6783 RELATED QUESTIONS

2 Answers

Tiny

rasmataz

August, 8, 2010 AT 5:31 PM

Hi Reagan78757, Welcome to 2carpros and TY for the donation

Lets start by inspecting and testing the crankshaft position positioning sensor-this is the one that tells the computer what plug to fire-let me know

Tiny

Reagan78757

August, 11, 2010 AT 8:37 PM

It turned out to be the Crank Position Sensor. Upon re-installation of engine, we apparently bumped the CPS wire, partially severing the wire next to the sensor. New sensor and it fired right up. Thank you!

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