Question about 1985 Jeep Cherokee
Just installed a crate GM 2.8 Liter engine in a 1985 Jeep Cherokee. Engine fired up, I set the dwell, timing, and adjusted the transmission linkage. Drove the vehicle around to validate the working condition. Was happy.
The next day I went to turn over the vehicle, and it would not start. Found out I was getting not spark. I have gone through a new distributer, replaced the ECM four times (had them checked), replaced the coil, replaced the wiring harness leads to the coil, distributer, placed more grounding straps on the engine to body, and still not fire.
I have 12 volts to the correct side of the coil. Not sure where the TPS is, checked the troubleshoot tips of both Chilton, and Hayes, and wonder what I am missing. Do not think the computer is down. Something is not sending voltage to the computer to telll the ECM to work.
Have any ideas. I have been thinking of placing a points, vacuum advanced old school system in it. But wonder if there is something I am missing.
Does a 85 have a ECU unit ??? sounds like it could be the switching transistor thats either under the coil or inside the distributor should look like a black plastic casing with 3/4 wires running to it then to the coil look at this first as often motor runs ,stop for a quickie somewhere and jump back in and engine will not fire up ,classic symptons
Posted on Dec 20, 2008
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Locate the spark plug wires in the Cherokee cylinder head. In the 4.0 liter engine, the spark plugs are below the coil rail assembly. On the 4.7 liter engine, the spark plugs are located under each corresponding engine coil.
Read more: How to Replace Spark Plugs in a Jeep Grand Cherokee ' eHow.com http://www.ehow.com/how_4484626_replace-spark-plugs-jeep-grand.html#ixzz27zi6736d
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