94 Explorer PLEASE HELP!!!
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New User
Joined: Sep 2002
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94 Explorer PLEASE HELP!!!
4.0 liter engine has a rough idle and the check engine light comes on within a few minutes of starting the engine. In an attempt to stop the orange glow from illuminating the interior of the cab at night I have replaced the plugs(looked normal, greyish), wires, IAC, EGR, O2 sensors (2), fuel filter(what a bitch to change), MAF (this stopped the horrible idle problem and made it a smaller idle problem)and still the erie glow. I stopped and checked and had the computer cleared each time at least autozone says they did. I put on a K&N filter and plugged the two vaccum lines that went to the bi-metal sensor should I have done this?? The engine has 130K.
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New User
Joined: Sep 2002
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94 Explorer PLEASE HELP!!!
Three different codes... tonight it is down to one "335" which turned out to be the vacuum sensor thingy that connects to the EGR. I just replaced the EGR which was one of the first three error codes. The very little part cost $60. I purchased it of course being in this deep it is to late to turn back. Do you think this could be the problem??
Senior User
Joined: Mar 2002
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From: Fayetteville, NC
94 Explorer PLEASE HELP!!!
i have a similar problem the idle stumbles once in a while, although i bneed a tune up i believe it may well be the fuel pressure regulator
70$ at autozone. the regulators tend to get stuck in open position after about 50,000miles the rough idle and stumbling is caused my a lower than normal fuel pressure (normaL IS 35psi ) the check engine light comes on if you drop below 25-30 psi. is your gas mileage affected? if so thats the problem replace the regulator.
70$ at autozone. the regulators tend to get stuck in open position after about 50,000miles the rough idle and stumbling is caused my a lower than normal fuel pressure (normaL IS 35psi ) the check engine light comes on if you drop below 25-30 psi. is your gas mileage affected? if so thats the problem replace the regulator.
Senior User
Joined: Jan 2002
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Clean the entire intake with Gumout or similar, while running. If dirty, it can cause all kinds of rough running/idling problems. Take care not to get Gumout on the temp sensor directly below the intake.
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Postmaster
Joined: Oct 2003
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From: SoCal
See your Haynes manual for the very simple directions on how to check fuel pressure, but before you hook up the fuel pressure gauge pull the vacuum hose off of the fuel pressure regulator & if it's wet with gas, replace it. If it's dry, screw on the pressure gauge & check pressure.
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Postmaster
Joined: Dec 2001
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From: UT
EGR faults can cause rough idle. Did you get all the EGR codes cleared? From what others have said, EGR codes are rarely the fault of the EGR valve itself. They are, instead, usually and electrical fault in the EGR sensor and/or circuit.