fuel pressure drop and shuts off on cold days??

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Jan 16, 2012 | 08:29 AM

xsubarudude

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Joined: Jul 2010

Posts: 6

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Model: Cherokee

94XJ shuts off on cold days after quarter mile (RESOLVED

Lately durring this cold weather , I have been experiencing my 94XJ shutting off as i go down the road. Idle or at a stop it runs fine. Any Ideas? Faulty O2? Code reader doesnt give any codes.

*UPDATE* Turns out the CPS that i replaced a couple months ago, had somehow managed to get it's wiring harness moved so that it was contacting the exhaust manifold,

.
So needless to say the wire insulation melted and it was shorting out on the engine. I put the OEM CPS back in and problem fixed!.

Last edited by xsubarudude; Feb 2, 2012 at 05:13 AM. Reason: (RESOLVED)

Jan 17, 2012 | 09:55 AM

xsubarudude

Thread Starter

Newbie

Joined: Jul 2010

Posts: 6

Likes: 0

Model: Cherokee

Additional info added:
I dont lose gauges, seems like i loose fuel pressure. but if it happens at HWY speed and i hit the gas , it jerks badly. Only in cold weather though.
once the engine is up to temp , the problem disappears. Im thinking it may be a fuel delivery issue.

Jan 17, 2012 | 10:39 AM

chill

Member

Joined: Dec 2011

Posts: 115

Likes: 1

Model: Cherokee

first thought was throtle possitioning sensor. check fuel rail pressure. 31lbs at idle. 39lbs with vacuum disconected at regulator.

Feb 2, 2012 | 05:13 AM

xsubarudude

Thread Starter

Newbie

Joined: Jul 2010

Posts: 6

Likes: 0

Model: Cherokee

*UPDATE* Turns out the CPS that i replaced a couple months ago, had somehow managed to get it's wiring harness moved so that it was contacting the exhaust manifold,

.
So needless to say the wire insulation melted and it was shorting out on the engine. I put the OEM CPS back in and problem fixed!.