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Old 09-23-2003, 10:38 AM
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non hotrod question for you guys who work for a living...

my wifes 94 taurus 3.8l /w 162k on it, threw on its check engine lite last nite, blinked on for a few seconds, then went off. car never stumbled, hesitated, or in any other fashion acted like it was having problems. when i got home, i hooked up my little scan tool, and found 2 codes, both related to the egr valve(which was replaced at 130k) code 326 and 327. what to do???
i found this thread but its not finished yet.....

can you guys enlighten me as to where i need to look next?...
the vac. hose coming off the egr is in good shape..was replaced as well.....
can an egr fail with 30k miles of use?
going to read up on how to measure the output voltage on the egr now.....


btw
code 326; pressure feedback shows low pressure EGR not seating or not seating intermittently/exhaust pressure transducer circuit voltage lower than expected.
code 327; EGR feedback signal is/was low. circuit voltage below minimum voltage.

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Old 09-23-2003, 10:44 AM
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I wouldn't worry about it as long as the light is out. It could have been a piece of carbon blocked the pintle of the egr valve and then it blew out. Just clear the codes.
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Old 09-23-2003, 11:10 AM
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Also check the hose going to the transducer, sometimes the egr works, but the hose to the transducer gets clogged with carbon and the transducer thinks the egr isn't working!
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Old 09-23-2003, 12:44 PM
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I would recommend putting in some Marvel Mystery Oil in the gas.
4oz. to 10 gal.s gas, the inside of your motor needs to be cleaned out. Sounds like its building up carbon deposits. Time to clean it before all the the other sensors start going.
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Old 09-23-2003, 10:40 PM
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Thumbs up thanks guys, i appreciate it.....

codes cleared.

tube from egr to where ever it goes is clear, you can hear the ballvalve at the other end actuating with vacuum.

MMO added. i went a tad heavy, not on purpose mind you, but a tad more than called for none the less.....

since the MMO, the lite has blipped on and off three more times, but like before, no deficit in performance...... guess i'll run this tank and see what happens......
i was going to r&r the egr to do a visual on it, but i have to pull a double tomorrow, so my sorry hide is off to bed. thanks again gentlemen.
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Old 09-23-2003, 10:53 PM
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Put electrical tape over the light,works for me.
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Old 09-23-2003, 11:09 PM
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Put your cars computer into the "wiggle test" mode and check the harness going to the EGR sensor, Ford wiring seems to have taken a dive since the early 80's and insulation cracks just seem to appear out of nowhere. Sounds like the computer sensed a zero voltage condition for a brief moment and set the code, normal engine vibration could be causing an intermittent wiring problem. Might be wise to check the connector also for corrosion, pack it with silicone grease while your in there. I would check the egr sensor for cracks too, a little moisture in there will cause all kinds of havoc.
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Old 10-01-2003, 09:09 PM
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update.

I did the wiggle test with no results, i had the scanner hooked up in capture mode to see what was going on with the lite... egr sensor voltage was normal around a hair higher than 3 volts... the lite went off, and the egr voltage dropped to zero. so i park it in the shop, waiting for whatever to happen, and i noticed antifreeze flying off the belt...... only place i could see coolant was the lower h2o pump tube....and then the h2o pump starts making this grinding noise. i put a new h2o pump on last summer., sooo i go to set about changing the h2o pump out, and i come in to check the board,and guess what,well, DMorris sent me a pm with the stuff i was needing.....he told me to apply vacuum to the egr with the engine idling, if it stumbles, it's most likely the egr sensor..... so i put on the new pump(freakin' lifetime parts) and a new egr sensor, $55. no more engine lite, runs smooth, just a slight miss every now and then.... most likely another sensor.....

thanks ever one. i do appreciate it.

hey Don, i changed the h2o pump in a tad over 2 hours, (including beer break, and taking the old one back)..... not bad for a bubba
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Old 10-02-2003, 05:55 PM
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Re: update.

Quote:
Originally posted by crazy larry
hey Don, i changed the h2o pump in a tad over 2 hours, (including beer break, and taking the old one back)..... not bad for a bubba
Your hired! Glad to see she's running.


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Old 10-02-2003, 08:05 PM
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i forgot to tell you,

that was without any impact tools, with the exception of the motor mount nuts.
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Old 10-08-2003, 07:55 PM
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If it has the PFE sensor (metal box, with two hoses to measure exhaust backpressure diffeential), they are most often the culprit in that scenario.
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