89 jeep cherokee 4.0l v6 4wd!! i replaced the cps plug and still having hard starts any answers??

 

What exactly is it doing does it crank at all?

 

It's that damned 4.0L V6. Most unreliable engine. Ever.

Is there something about the app that's preventing new users from seeing the OEM Cherokee Tech forum or preventing them from seeing that Cherokee Chat is specifically a non-tech forum?

 

Let's start with more details. From you.

Describe hard starts.

What have you done so far?

 

it starts and runs but wen u try to start it it cranks for a while b4 it starts up.i changed the cps plug still the same. engine was rebuilt it has 50,000 miles!! runs great jus hard starts??

 

Hard starts. You mean long crank time before it starts? Runs good or bad once it starts?

 

Long crank time is normal for a renix. Ecu waits for signal to the cps or something like that. Im sure cruiser knows

 

I believe the ECU has to see 4 (or was it 5) complete revolutions of the flywheel/flexplate before initiating spark. That data comes from the CPS. Cruiser can correct me if I'm mistaken. That said, a more detailed description of "long crank" will be needed. From personal experience, 2-3 seconds of cranking is not unusual for an '89 XJ.

 

300 RPM. Test CPS per my tips number 7.