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89 Cherokee crank no start.

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Old Jan 27, 2015 | 11:47 PM
  #16  
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Originally Posted by Dolphin

Instead of just infinitely cranking it is now kind of bogging down. If the cps is unplugged, it doesn't happen. Plugged in, it's bogging out.

I can't check ecu codes because her check engine light doesn't work.

Any ideas?
Renix has no light, stores no codes. The "bogging" and no acv signal from multiple cps's reenforces the thought of the post 90 torque plate. (flywheel)
I surely hope I am wrong there!

Last edited by DFlintstone; Jan 28, 2015 at 12:52 PM.
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Old Jan 28, 2015 | 12:21 AM
  #17  
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I read that you can check the ecu codes by turning the key on, off, on, off, on and counting the blinks of the check engine light? It was running previously. She says the parts engine has been installed for around 4 years now.
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Old Jan 28, 2015 | 05:38 AM
  #18  
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. 91 and up ^^^
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Old Jan 28, 2015 | 05:42 AM
  #19  
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Originally Posted by DFlintstone
OK, saw the vid. #1 is at the 5:00 position as viewed from the passenger side. 143624 clockwise. (the book is wrong).

The MAP sensor up there left of center on the firewall should have a tube going to the rubber plug on the inside of the tb. OR any intake manifold vacuum. VERY important that, the vacuum to the map. (and the firing order)
Dont see vacuum line either ....yellow one to throttle body ?
Attached Thumbnails 89 Cherokee crank no start.-efhek.jpg  

Last edited by freegdr; Jan 28, 2015 at 05:47 AM.
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Old Jan 28, 2015 | 08:33 AM
  #20  
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Check the coil too, it can fail suddenly
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Old Jan 28, 2015 | 09:09 AM
  #21  
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Have you checked the motor ground on the back of the block to the fire wall
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Old Jan 28, 2015 | 10:51 AM
  #22  
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Will check:
Engine ground
Vacuum lines
MAP sensor
Coil
Different battery

I don't have an fsm, can anyone provide the multimeter test for the coil? Any good way to test the FPM without special tools?
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Old Jan 28, 2015 | 04:06 PM
  #23  
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Ground is good, I took it off and cleaned it just in case.
Vacuum line is connected from MAP to throttle body.
I took off the coil and all the connections are clean.
I tried a different battery with no change in how it cranks.
Fuel pump is definitely working. I can hear it engage when the key goes on and there is fuel on the plugs.
I'm at a loss.
Gremlins?
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Old Jan 28, 2015 | 05:34 PM
  #24  
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Originally Posted by Dolphin
Ground is good, I took it off and cleaned it just in case.
Vacuum line is connected from MAP to throttle body.
I took off the coil and all the connections are clean.
I tried a different battery with no change in how it cranks.
Fuel pump is definitely working. I can hear it engage when the key goes on and there is fuel on the plugs.
I'm at a loss.
Gremlins?
I'm at a loss bro sorry, I bet it's something we're all gonna kick ourselves in the teeth over.
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Old Jan 28, 2015 | 05:56 PM
  #25  
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Did you check the coil resistance?
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Old Jan 28, 2015 | 06:07 PM
  #26  
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I can't remember exactly how I did it. But I remember getting a 0.9 reading with it removed. Sorry, its been a long day. My brain is kind of fried.
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Old Jan 28, 2015 | 09:36 PM
  #27  
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Are you checking the crank position sensor properly?

Sounds like you have your meter set to DC instead of AC.
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Old Jan 28, 2015 | 11:08 PM
  #28  
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For CPS sensor I first check using ohms for a range of 175-225. It's pulling 202. Next I check AC volts (my multimeters lowest setting is 200) and check for a value of .5-.9 while cranking. It shows 0. I quoted that from memory. I've been eating, breathing, and dreaming this stuff since I started diagnosing.

For the coil, since I don't have an fsm, I don't know how to properly test it. I've not used dcv at any point. Does anyone has the fsm and can copy the coil test and values to this thread?
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Old Jan 28, 2015 | 11:18 PM
  #29  
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some good advice here https://www.cherokeeforum.com/f2/ign...esting-148594/
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Old Jan 28, 2015 | 11:40 PM
  #30  
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Originally Posted by Dolphin
For CPS sensor I check AC It shows 0.
There was a reason I'd asked if she has had it running since the engine swap. And, without a signal from the cps, it won't do anything right. It might be a great vid to show what an HO pattern does for the CPS/ECU in a Renix. I don't know! (of course) Just something to rule out.

Last edited by DFlintstone; Jan 28, 2015 at 11:48 PM.
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