I have a 1999 ford explorer with returnless fuel system this vehicle runs so rich with in 3 min. of running will foul plugs tech line told me that 65 psi of fuel pressure is with in spec but my all data say 40-65psi wondering if I should see 65 at idle. Vehicle also has very rough idle like high lift camshaft was installed. Please Help Me.

6ya staff

• 2 Answers

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Posted on Jan 02, 2017

SOURCE: Ford Escape 3L 2002 Rough idle

generally, when the engine is washed, water gets trapped behind the spark unit and stays there, creating a shorting path for spark plug current. best to dis-mount the spark unit (follow plug wires back to source) and dry and clean it thoroughly.

Posted on Jul 07, 2008

SOURCE: My 1999 Ford Explorer will

did u let all thae air out of the fuel rail

Posted on Jan 25, 2009

SOURCE: 1993 Ford Explorer idles rough when engine is warm

you might want to check your fuel injectors or your O2 sensors there are 2 of them 1 on each side of the block located on the pipes coming from the exhaust manifold

Posted on Apr 21, 2009

ronald jimenez

• 308 Answers

SOURCE: I have replaced the fuel pump on this 92 Ford

The mechanic should check on the idle .Because the Idle of the truck is adjusting by it self . That causes the truck to stop .check the Idle then lock it up to so that it will not adjust until it will make the truck stop .the main reason why the truck stop and pressure guage going down steadily is that no fuel enters the fuel pump when it adjust Idle by it self . It adjust by closing way or blocking the fuel to pass and go to the engine.then the engine dies .

Posted on Aug 22, 2009

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SOURCE: 94 toyota land cruiser runs rich, rough idle, no power

You have a fuel injected car. Things that can cause too rich would be a bad altitude sensor like the map or mass air flow depending on which one you have.
Anything that would cause excess air to go into the exhaust system like a cracked exhaust pipe before the 02 sensor, or low compression, or a stuck open pcv valve, intake gaskets, throttle body base gasket.
Or a Throttle position sensor which is telling the computer you foot is on the gas when it is not.
Its possible you have a bad PCM,, or coolant temp sensor saying the motor is still cold as its warming up.
Its possible you have a vacuum hose somewhere on the engine with a big crack in it or its just inplugged and you dont see it.

But my first guess would be possibly a bad computer.
Try creating a big vacuum leak when its loading up. It should run better.

Also if you have an egr valve it could be stuck open a little causing excess air or an idle air control valve stuck open.

Does it clean up if you rev it up or does it blow black smoke reved and at idle. This could point towards the altitude sensor.

Posted on Dec 22, 2009