Car spits and sputters and OBD code P0837

Tiny
IROC
  • MEMBER
  • 2003 JEEP GRAND CHEROKEE
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 115,137 MILES
Ive changed every sensor on the motor. MAP, TPS, IRA, Crank PS, Cam PS, ect. Also ive changed the down stream 02 sensor at the collector. None of the above worked so I figured the ECU I bought a new one and replaced and still same old same. Car wont run right the idle rises and falls, spits and sputters with the same OBD code P0837. PLEASE if you have any ideas ive wasted SOO much money and time.
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Monday, June 29th, 2015 AT 10:14 AM

9 Replies

Tiny
MHPAUTOS
  • EXPERT
P0837 Description
Four Wheel Drive (4WD) Switch Circuit Range/Performance

So this is not your problem. Have you checked fuel rail pressure? Sounds like a fuel supply problem.
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Tuesday, June 30th, 2015 AT 5:44 AM
Tiny
IROC
  • MEMBER
Yes everything with the fule system specs out and changed the fule pump and filter.
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Tuesday, June 30th, 2015 AT 7:54 AM
Tiny
MHPAUTOS
  • EXPERT
Have you had and are you getting any codes?
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+1
Wednesday, July 1st, 2015 AT 5:29 AM
Tiny
IROC
  • MEMBER
Yes I did get another code P0353 misfire on #3. So I pulled the coil pack/ rail, and the plug everything looked good there so then on to the connector and wiring. Nothing is melted or messed up so then I figured to check my 5v at the plug and everything checks out. I even changed my coil pack/ rail and did a hard reset and still the same old same.

I'm so confused this is driving me CRAZY!
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Saturday, July 11th, 2015 AT 7:51 PM
Tiny
MHPAUTOS
  • EXPERT
Still have the misfire code, check for vacuum leak spray pattern for injector, you may have to do a cylinder /power balance test on an oscilloscope to see random coil low voltage, you will not see any visual evidence.
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Sunday, July 12th, 2015 AT 5:26 AM
Tiny
IROC
  • MEMBER
That's where Im at a loss I don't have access to those things and every shop wants to charge $ 80 to 100 an hr. Also here is the kicker, when I had replaced the computer it ran like a top for a week then all at once it stalled and gone to hell since. Im going to call the computer co. Where I bought the new one and ask if they have done a diagnostic on the old computer to see if that might get me somewhere.
I spoke with a couple of Jeep dealers and they have never heard of the problems im having nor do they want any part of trying to help.
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Sunday, July 12th, 2015 AT 2:48 PM
Tiny
MHPAUTOS
  • EXPERT
If you find out what was wrong with the original ECU post it here as this may give some insight into where to go next, shame that the dealers don't want to know.
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Monday, July 13th, 2015 AT 1:42 AM
Tiny
IROC
  • MEMBER
I was hopping by talking it out with some one I could find or figure where I over looked something or forgot something.
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Monday, July 13th, 2015 AT 5:08 PM
Tiny
MHPAUTOS
  • EXPERT
You can check for vacuum leaks your self, with the engine running spray a little starter fluid around the inlet manifold gasket, vacuum ports and throttle body, the revs will pick up if you hit a leak.
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Tuesday, July 14th, 2015 AT 12:29 AM

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