1991 YJ 4.0L dies when hot (tough one) - Page 2 - JeepForum.com
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Unread 10-05-2013, 08:15 AM   #16
WDNewman
Registered User
1989 YJ Wrangler 
 
Join Date: Jun 2013
Location: Central Mississippi, Mississippi
Posts: 1,033
Quote:
Originally Posted by Akumakis View Post
Tried a few things, but not the CSPS yet.

Testing for resolution is tough. It takes a while to heat up to the point of quitting, and we tend to stop for beers when out 4beer4ing. Even enough downhill seems to give it sufficient time to rest.

As I have time to try things and test properly, I'll keep posting on it.

Thanks, all.
My money is on the CSPS. Your symptoms are exactly what mine were until I replaced the Crank shaft position sensor. Has not had a problem since.

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Unread 10-09-2013, 08:59 PM   #17
Akumakis
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1991 YJ Wrangler 
 
Join Date: Sep 2012
Location: Kelowna, BC
Posts: 9
Discussion was re cam pos sensor, not crank pos sensor. I replaced the latter prior to initial post; no effect. I see the cam pos sensor is in the distributor; I'll dig one out of a wrecking yard or buy one, and report back.

Quote:
Originally Posted by WDNewman
My money is on the CSPS. Your symptoms are exactly what mine were until I replaced the Crank shaft position sensor. Has not had a problem since.
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Unread 11-02-2013, 08:43 PM   #18
Akumakis
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1991 YJ Wrangler 
 
Join Date: Sep 2012
Location: Kelowna, BC
Posts: 9
Vss

Not the VSS. I disconnected it entirely, no effect at all. Doesn't run bad...I read that the VSS only affects idle when you come to a stop. In any case, no help there.

Bought a new distributor, which I've never replaced before, and contains the new cam pos sensor. I'll install and see if i can make it quit again. Cold weather making it trickier to test.
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Unread 11-02-2013, 10:03 PM   #19
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,678
Don't rule out the vss. There is one other possibility. Check the writing harness that goes down the firewall behind the battery that supplies the vss. It's a possibility that it is shorting. If the vss shorts it will take out the voltage for the vss. Mine was burned by the manifold and shorting.
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Unread 11-03-2013, 08:15 AM   #20
Cajun90YJ
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1990 YJ Wrangler 
 
Join Date: Feb 2008
Location: SW Louisiana
Posts: 209
I have seen the pcm cause this issue, on 3 diff Chryslers, 95 jeep 4.0, dodge Dakota and an 06 TJ. The pcm would get hot after driving or engine running and the pcm would lose a ground internally. They would throw cam and crank codes, and a few others. it can throw any that the pcm grounds. You can usually cause it to die (after you get it cranked following the first stall) by tapping on the pcm with a screwdriver handle or something. DON'T BEAT IT! Light taps should do it if that is the cause.
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Unread 11-04-2013, 01:57 PM   #21
Akumakis
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1991 YJ Wrangler 
 
Join Date: Sep 2012
Location: Kelowna, BC
Posts: 9
This is interesting. When the problem first occurred I suspected a sensor, or the ECU. I'll try your trick.

1991 Jeep YJ Renegade 4.0L
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