2.9 has a rough idle HELP!!
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Joined: Aug 2004
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From: Minnesota
2.9 has a rough idle HELP!!
I have a 1990 ranger with 2.9 V6 and I recently did a tune up on it but it still idles rough! Here is a list of what I replaced ( Plugs,wires,cap,rotor,coil,air filter,and flushed & changed all fluids!). What else should I look at replacing it has 120,000 miles on it! It idles at 700rpms but it has a miss and if you try to rev it when its cold it stumbles and almost dies! Once your driving down the road it runs smooth! Any ideas what might be wrong with it!! Thanks for the help!!
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Senior User
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From: Minnesota
No codes or vacum leaks I just replaced the spark plugs and the ones I pulled out all looked good and warn evenly no signs of fouling or oil nothing! Any other ideas???? What should the fuel pressure be and how do you check it?
Last edited by jdhudall; Apr 12, 2006 at 04:41 PM. Reason: forgot a question
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From: UT
Ken00 posted a little write-up on checking fuel pressure in his tech info post in the BII forum. You could try reading that. Basically, you get a fuel pressure gauge, attach it to the Schrader valve on the fuel rail, and see what the fuel pressure is under different circumstances. Should be 30-45, depending on exact test state.
When you say, "no codes" do you mean all pass codes or no codes at all?
When you say, "no codes" do you mean all pass codes or no codes at all?
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Joined: Dec 2001
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From: UT
No codes at all is a fault condition that should probably be investigated (perhaps it's even related to your stumble/miss). I don't know what kind of output device you are using (scanner, code reader, paper clip/test light), but the first thing to do is make sure you are hooking up the test equipment properly. There are instructions posted here at FTE, in several other places on the internet ("Ford EEC-IV self-test" into your favorite search engine), or in any self-respecting repair manual.
Once you've determined that you are setting up correctly, and you still can't get the computer to respond, then check out the wiring from the self-test connector to the computer, computer's main power supply, and computer's main grounds.
Once you've determined that you are setting up correctly, and you still can't get the computer to respond, then check out the wiring from the self-test connector to the computer, computer's main power supply, and computer's main grounds.
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