New engine, crank no start

kybray44 · Apr 25, 2010

Got the rebuilt installed, but now when attempting to start, it cranks, but I dont recieve any spark. Ive checked the CPS and it reads the same resistance as the brand new one I havent installed yet. I have no spark from the distrubutor nor the ign coil. However, when I turn the key on and check voltage at the ign coil, I have 12v. Any ideas?

1990 Cherokee with 4.0 inline 6

winterbeater · Apr 25, 2010

I guess an easy check would be to pop the distributor cap and make sure the rotor is turning when you crank.

joe_peters · Apr 25, 2010

winterbeater said:
I guess an easy check would be to pop the distributor cap and make sure the rotor is turning when you crank.

Yes, I agree.

Next step is determine why the primary windings of the coil aren't collapsing so the secondary windings can fire.

Start with your grounds--head to firewall, ICM/ECU/o2 sensor to dipstick tube.

Next test the ohms of the CPS/CKP crank sensor--125 to 275 (200 + - 75) ohms.

If nothing, test the harness to see that the ECU can receive the input from the crank sensor.

Post back what you find.

kybray44 · Apr 25, 2010

the tricky thing was I was test the ohms and they were within specs, I decided to pull the CPS and low and behold it was broken. Now I have spark, still no start. Also, my fuel gauge is not reading..any ideas? If its not one thing its another.

joe_peters · Apr 25, 2010

Ok, try this:

1. Depress and hold the accelerator pedal to the floor.

2. While firmly holding the accelerator pedal to the floor, crank the engine--don't let the pedal up until it starts.

winterbeater · Apr 25, 2010

Or pull the plugs and clean them. Spray them good with spray start if they are wet with gasoline. They will dry out quickly.

kybray44 · Apr 25, 2010

still nothing, when I attempt to start it makes a sound as if it is retarding it self from starting

winterbeater · Apr 25, 2010

Did you pull the plugs to see if they are fouled out from the cranking before? At least one plug?

joe_peters · Apr 25, 2010

Getting the distributor correctly indexed is a real B*hatch. Try indexing one or two teeth either direction.

kybray44 · Apr 25, 2010

GOT IT. YES thanks for all your guys help. I had the wrong TDC and firing order was one off.

joe_peters · Apr 25, 2010

kybray44 said:
GOT IT. YES thanks for all your guys help. I had the wrong TDC and firing order was one off.

Its Miller Time!

arty:

New engine, crank no start

kybray44

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