Ranger EGR Problem?

CATTIAS

MEMBER
FORD F-150

I have a 2001 Ranger with a 2.3L, M/T, and 65,000 miles. Lately it jerks or bucks between 1500 and 2500 rpm at light throttle openings, particularly when warmed up or at ambient temps above 65 deg F. Feels like it's running lean. It runs well with the EGR unplugged (except for the MIL being lit). There is no MIL when the EGR is plugged in to indicate what's wrong. The repair shop has replaced the MAF, the fuel pump, the O2 sensor, the EGR, and the crank position sensor, without fixing the problem. What's the next thing to check? I'm guessing the problem is either with a sensor that sends info to the PCM or EGR, or the PCM itself.

Friday, June 22nd, 2007 AT 10:57 PM

3 Replies

MERLIN2021

MECHANIC
17,250 POSTS

Check the egr solinoid.

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Saturday, June 23rd, 2007 AT 8:00 AM

CATTIAS

MEMBER
2 POSTS

I don't think it has a solenoid. It's an electric EGR--a water cooled stepper motor. The EEGR is controled by the PCM, which gets its information from the TMAP sensor, the MAF, the Throttle Position Sensor, the Cylinder Head Temp sensor, the crank position sensor, and maybe a coolant sensor.

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Saturday, June 23rd, 2007 AT 11:01 PM

INDYUKE

MECHANIC
416 POSTS

The coolant sensor does tell the PCM when the truck has warmed up enough to start using the EGR system. But I don't think the coolant sensor is at fault seeing as it does not do this while cold.

How is your EGR controlled? Does it have a vacuum line going to it along with a two-wire harness? Or is there only wires going to it and no vacuum line? I believe merlin was say that the WAY the PCM controls the EGR is normally through a duty solenoid that regulates vacuum to the EGR valve.

(ps. Don't tell anyone I said this, because i'm a big advocate of repairing things correctly using the correct parts. But ford has had a problem with their EGR systems, especially on their full-sized pickups.

As the engine wears out, things start to fall out of range, like sensors, intake flow charactaristics because of carbon buildup from the EGR system and the PCV system etc. So they came out with an EGR restrictor plate that goes between the EGR valve and the intake manifold that takes the 1/2" hole down to a 1/4" hole.

My truck had the same problem you describe, and I tried everything because I really didn't want to do a cheezy repair. But in the end I tried it. Runs as smooth as when it was new, no pinging and still passes emissions. Crazy!)

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Monday, June 25th, 2007 AT 2:29 AM