An intermittent no crank problem from over the pond - JeepForum.com
 
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post #1 of 6 Old 07-08-2020, 06:50 AM Thread Starter
FC1
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1994 XJ Cherokee 
 
Join Date: Apr 2007
Location: Brentwood, Essex, UK
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An intermittent no crank problem from over the pond

Hi Guys a question from over the pond. I have an 118,000 miles, 1994 Jeep Cherokee XJ 4.0 automatic with an annoying intermittent no crank no start issue which I hope someone might be able to point me in the right direction in solving. I have read the many posts and threads on here but not found one yet with similar symptoms to mine.

When I turn the ignition to ON everything lights up on the dash as it should and the fuel pump is on but often turning the key to the start position results in nothing happening. No clicking sounds and no crank. But if I hold the key constantly in the start position for about 10-30 seconds the engine will then suddenly start as if nothing was wrong. Sometimes it will kick into life immediately and sometimes there is a fraction of a second delay before starting.

Initially I followed the threads that pointed to a faulty NSS and I tried the wriggling of the gear shift through the gate and yes it would start after a while but whether this was the problem I donít know because I have now fitted two new NSS switches as well as a new starter motor and a new battery. I have also thoroughly cleaned all the ground points in the engine bay (that I know of) and cleaned the electrical contacts on the ignition switch at the lower end of the steering column but I still have the problem. Can anyone advise please? Cheers Jim

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post #2 of 6 Old 07-08-2020, 07:22 AM
jtec
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BEcause your in Great Britain and it is family ties saying give this post a thought or two.

I am thinking ignition switch, as you have already replaced the NSS, not the key lock the elec portion. Holding key steady has me focused on that switch....

I will TRY to get a wiring dia to help us find a test....but 1994 oy Vey.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #3 of 6 Old 07-08-2020, 08:02 AM
jtec
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attachment for discussion and testing
Attached Files
File Type: pdf 94XJ_ign sw.pdf (86.1 KB, 2 views)
File Type: pdf 94XJ_starter and relay.pdf (87.7 KB, 3 views)

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #4 of 6 Old 07-08-2020, 11:17 AM Thread Starter
FC1
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Join Date: Apr 2007
Location: Brentwood, Essex, UK
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Hi Jtec

Many thanks for the wiring diagram PDFs. I'll get reading and have a look at the Jeep over the weekend. Stay safe and well in these strange times.
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post #5 of 6 Old 07-09-2020, 08:22 AM
BagusJeep
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I suggest you start at the starter relay in the PDC. On the four connectors you should have one permanent power and one which is live only when you turn the key to Start.

The grounding of the control side of the relay is through the neutral safety switch. You should therefore have one good ground in Park that is open in Neutral.

You can learn a lot just by studying that relay and eliminate areas.

BagusJeep lives in Bali.

1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE
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post #6 of 6 Old 07-09-2020, 10:57 AM Thread Starter
FC1
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Location: Brentwood, Essex, UK
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Thanks BJ, I'll get the meter out and have a play at the weekend
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