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I have a 1989 Mallard Motor home with a Ford E350 chasis (7.5 L 460 engine). I was travelling out in eastern Canada last year when the engine light began flashing on whenever I drove up a steep hill or when first starting out first thing in the morning. The light would flicker on and then go out. I eventually got used to it and decided to ignore it until I got home. Well, things got busy and the unit went into storage. I’ve got it out now and am trying to get it ready for a trip down into the states. I’m trying to track down the cause of the flashing engine light. The code I pulled from the EEC is a code 32. (This code came from the “continues memory” of the EEC.) I checked the internet and these are the descriptions I found:
– EVP circuit has intermittently failed below minumum voltage of 0.24 volts.
– PFE (Pressure Feedback EGR sensor or circuit) shows low pressure. EGR not seating or seating intermittently
– PFE circuit voltage is low
I tested the operation of the EGR and according to my test checks out. ( I attached my vacuum pump to it, applied vacuum at idle and the engine stalled. The vacuum remained constant as well indicating that there were no leaks in the diaphram.)
I also tried testing the EVP sensor by hooking up my multitester set on 200K ohms to the EVPsignal post and Voltage reference post of the sensor. The meter read 4.2 before vacuum was applied to the EGR. As I applied vacuum the meter readings jumped up and down a bit but stopped at 3.0 with about 8 in hg of vacuum. I’m not sure if I’m testing this sensor properly, though. I was hoping someone might be able to give me some advice or point me in the right direction. Any help would be appreciated.
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It sounds like your egr is working with the test you did. Its either the signal/wiring to the egr
or the evp is having an issue see if this helps.http://easyautodiagnostics.com/ford/4.6L-5.4L/how-to-test-the-egr-system-4
Thought I’d give you an update of the issue that you responded to, College Man. I followed the instructions from the site you gave me, however, I skipped the test on the DPFE sensor as I’m almost sure I don’t have on on this 1989 model. So the operation of the EGR itself is fine and it holds a vacuum eliminating the presence of leaks. The EGR solenoid is getting vacuum to it and it as well as a ref. voltage. The road test also passed for the solenoid. I pulled off the EGR valve Position sensor and checked its operation by measuring the ohms with an analogue meter while depressing its shaft. The needle decreased smoothly, however, I was surprised of the small range it had ( approx. 45 ohms down to about 30 ohms.). After all my tests, I cleared the codes and took the vehicle for another test drive. The engine light didn’t turn on during the drive but when I checked for codes, I got a code 31 this time ( EVP signal is/was out of range , EVP signal is/was low, PFE signal is/was low ). I’m wondering if the EGR sensor’s range is the issue here. I tried finding the expected range of the sensor online but had no luck. Would you happen to know where I might find this info? I’m guessing the info is in the service manual for this year and make but unfortunately, I don’t have one.
A correction on that ohms reading. I took it again just to make sure my info was correct. the EGR position sensor’s resistance went from just below 4 to just above zero using the R x 1K scale. Hope this makes more sense.
[quote=”Gearwrench” post=171171]A correction on that ohms reading. I took it again just to make sure my info was correct. the EGR position sensor’s resistance went from just below 4 to just above zero using the R x 1K scale. Hope this makes more sense.[/quote]
That resistance sounds low.
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