Haynes 
. 
EVP or DPFE problem on 92 4.9
Thread Starter
|
Senior User
Joined: Sep 2002
Posts: 321
Likes: 0
From: kansas
EVP or DPFE problem on 92 4.9
Truck is a 92 F-150 4.9 M5OD.
Getting a code thrown. Happens when I wind up a little on the motor and let it coast down while still in gear. If I let it out of gear it doesn't seem to happen, except once or twice when I missed a shift and it saw a little more rpm than I normally like to run it at. Engine light always goes off after six seconds, every time.
KOEO test has system pass and when memory codes come up it shows a 327-EVP or DPFE circuit below min voltage. KOER test shows 172-HEGO shows system always lean.
Problem is the friggin chilton doesn't bother to say what a EVP or DPFE is! (chiltons suck) Does anybody know what they are so I can try to check them? Thanks!
Getting a code thrown. Happens when I wind up a little on the motor and let it coast down while still in gear. If I let it out of gear it doesn't seem to happen, except once or twice when I missed a shift and it saw a little more rpm than I normally like to run it at. Engine light always goes off after six seconds, every time.
KOEO test has system pass and when memory codes come up it shows a 327-EVP or DPFE circuit below min voltage. KOER test shows 172-HEGO shows system always lean.
Problem is the friggin chilton doesn't bother to say what a EVP or DPFE is! (chiltons suck) Does anybody know what they are so I can try to check them? Thanks!
Thread Starter
|
Senior User
Joined: Sep 2002
Posts: 321
Likes: 0
From: kansas
EVP or DPFE problem on 92 4.9
Dug around in the egr section of the chilton and found a tiny little part on the "Pressure Feedback Electronic (PFE) Transducer". Sounds like the DPFE is a mis-print to me. No testing instructions, location, description, nothing. Not that you could depend on them anyway.
Learn from my mistake, Buy a Haynes instead.
Learn from my mistake, Buy a Haynes instead.
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
EVP or DPFE problem on 92 4.9
[updated:LAST EDITED ON 24-Dec-02 AT 08:46 AM (EST)]Send me a real e-mail and I'll attach the MityVac manual to my reply. It has the test procedure for that sensor. Just be sure to put something specific in it to remind me what you want - I get a lot of e-mails.
Thread Starter
|
Senior User
Joined: Sep 2002
Posts: 321
Likes: 0
From: kansas
EVP or DPFE problem on 92 4.9
I have not been able to find a DPFE or PFE or whatever valve. I am assuming that my truck does not use one. Which sorta makes sense, if I have the EVP then I don't need the other one. Like having a MAP sensor makes a MAF redundant.
Per the Chilton I tested the EVP sensor. It has 5.0 volts ref voltage, and with the key on and engine off, there is .41 volts between the other two wires. Supposedly it's good if there's less than .67 volts there.
Any ideas?
Only thing I can think of that might matter is that both cats are removed. The two pipes were Y-ed together after the O2 sensor and join into a 3" pipe that runs to the trans. crossmember where it goes to 2.75 I.D. until it hits the stock muffler.
That would definitely affect exhaust pressure, but as I don't (I think) have a PFE it shouldn't matter.
Per the
Chilton I tested the EVP sensor. It has 5.0 volts ref voltage, and with the key on and engine off, there is .41 volts between the other two wires. Supposedly it's good if there's less than .67 volts there.Any ideas?
Only thing I can think of that might matter is that both cats are removed. The two pipes were Y-ed together after the O2 sensor and join into a 3" pipe that runs to the trans. crossmember where it goes to 2.75 I.D. until it hits the stock muffler.
That would definitely affect exhaust pressure, but as I don't (I think) have a PFE it shouldn't matter.
Thread Starter
|
Senior User
Joined: Sep 2002
Posts: 321
Likes: 0
From: kansas
EVP or DPFE problem on 92 4.9
Man, I am so POOR right now. Christmas just about killed me. Got a job interview coming, but don't know how it'll turn out yet. When the money comes in I'll definetely grab a haynes. Probably gonna BURN the chilton.
Trending Topics
Hotshot
Joined: Aug 2002
Posts: 12,679
Likes: 15
From: BC, Canada
EVP or DPFE problem on 92 4.9
The readings you are getting from the EVP might be right when you are testing it but you cant see what they are when it is actually working unless maybe you follow Steve's Mityvac instructions and actually check the output at different EGR openings. It is very common for the EVP to turn on the check engine light for a few seconds and then go off again. Just replace the sensor and see what happens. You might want to try borrowing one off a buddies truck to try it before you buy one. They only take a minute to replace.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Thread
Thread Starter
Forum
Replies
Last Post
SteelHorse4x4
1987 - 1996 F150 & Larger F-Series Trucks
7
Apr 9, 2017 12:12 AM
DBGrif91
1987 - 1996 F150 & Larger F-Series Trucks
4
Sep 9, 2013 05:21 PM
Tom92F150
Ford Inline Six, 200, 250, 4.9L / 300
24
Aug 31, 2010 08:29 PM