tried the paper clip trick, worked good, and had a helper write down the numbers. i had to do it twice, cuz i forgot to mention the long pauses. anywho, i discovered that all of the codes are egr related according to the tech articles, there are eight egr codes that go 3 _ _, and i have 5 or 6 of those codes written down. i dont recall exactly which ones they are, but they are all egr. what do i need to replace to get rid of these codes? bad valve? bad transducer?
Well if it's EGR related then it'll be one of several things. The EGR valve might be stuck open or closed, the EGR passage in the intake might be clogged, the pressure feedback sensor might have taken a dump (pretty common), the vacuum regulator might be malfunctioning, or the vacuum lines are screwed up somehow.
chris, if it helps any, there is no rough idle, and the cel comes on a few minutes upon firing up the car, and also at high speeds, ~75-80, then goes away after slowing down to about 70. my gas mileage seems low as well.
If the idle isn't rough I think we can rule out the EGR valve being stuck open. With the reduced mileage and CEL at highway speeds it seems like the EGR isn't opening or isn't flowing. Highway cruising speeds are when it's commanded most often and it helps to increase MPG. Gotta get those codes to see if it's identified a single component.
35 - EGR signal voltage too high or RPM below spec during engine run test or EVP voltage high
326 - EGR sensor circuit voltage lower than expected
335 - EGR sensor circuit voltage higher or lower than expected during KOEO
336 - EGR sensor circuit voltage higher than expected / exhaust pressure high
337 - EGR sensor circuit above maximum voltage
Oh yeah, I think it's very safe to say that the pressure feedback sensor is fubar.
hey big mike ...look at the hard plastic lines on egr ..they are very brittle and crack easily ...i just got mine to pass emission test ...both lines > red and green were broken ...made cel light and code was > p0174 system too leann bank 2 < passenger side engine had 2 broken vac lines all good now ...sad for me to have to worry to fix it but car is sold on fri. nite ...something i had to do and the buyer paid for the repairs...sux now he is getting a mint car for a 94 tbird
i do know that they hooked a vacum line to my egr valve and said it would cause the car to fail running ,,,mine stumbled but ran...he said the vacum lines being broke caused it to run ..if it was tight vacum would stall the motor...emission passed today after 276.00 dollars later
yesterday, i was recharging the a/c and heard a hissing sound. i discovered that a rubber vaccuum hose had deteriorated and broken free and was laying on the pass. side shock tower, sucking in the open air. this hose runs from a "tee" fitting on the pcv hardline to a another barbed hardline that follows the contours of the shock tower and continues towards the front of the engine bay. where does this hardline run to?
also, what are symptoms of said broken vaccuum hose sucking up air? im still getting a cel, but its not as frequent. its temporarily fixed, as i need to cut and install a new section of hose.
That lines runs to the EVAP canister. With that hose broken, the CEL will usually be along the lines of "EVAP flow problem", but since you have OBDI I don't know how closely the PCM monitors that system or if there is a flow sensor like OBDII.