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?
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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