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2002 Jeep Cherokee RPM at Start up

Tiny
BILLCAPERS
  • MEMBER
  • 2002 JEEP CHEROKEE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 105,000 MILES
When it is first started, the RPM immediatly jumps to about 2300 RPM. Much like a stuck choke on a carborator. After a few seconds, the RPM returns to a normal idle speed 800 RPM or so. Since this is fuel injected, What would cause this? Would the fuel pressure regulator have andthing to do with it?
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Thursday, November 13th, 2008 AT 5:41 PM

1 Reply

Tiny
JNOVACK
  • MECHANIC
  • 723 POSTS
You need to check fuel pressure it should be 44.2-54.2psi during running then turn engine off and release pressure when turn key on do not start it should be the same it will drop after 5-7 sec. If your pressure is within these limits then the pcm needs a software update
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Thursday, November 13th, 2008 AT 6:45 PM

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