Ok, I have a 96 F250 5.8 w/o mass air. I scanned for codes the other day and from the memory I got code 172 and 334. I'm just wondering what all I can do to try and fix this codes. And, like i'v seen alot now, it starts hard when its hot. I never used to have this problem. It cranks forever and then I get a cloud of black smoke when it starts. If I floor it it doesn't crank as long but doesn't start immediately still, just no smoke. Any ideas?

 

go to www.fordfuelinjection.com will tell you the codes. also i would say you have a starting problem. bad cables or wek starter maybe. the extra cranking time may be allowing it to flood itslef and when it finally starts it burns all the raw gas off. or theres a slight chance that your getting oil in a cylinder or two that could be black smoke(unlikely but i suppose it could happen)

 

172- HEGO sensor circuit indicates system lean (right side)

334- DPFE or EVP circuit above the closed limit of 0.67 volts.

Source- www.fordfuelinjection.com

 

Just a heads up, if you don't have Mass Air, then you have what is known as, "Speed Density."

Code 172 is "HEGO sensor circuit indicates system lean (right side)"
This is most likely your O2 sensor on the right (Passenger) side.
Try replacing it first.

Code 334 is "DPFE or EVP circuit above the closed limit of 0.67 volts."
This means that either your DPFE (Delta Pressure Feedback of EGR) or EVP (EGR Valve Position Sensor) is not functioning correctly.

DPFE's routinely fill with condensation and/or go bad. I would pull off your EGR, clean the entire assembly including the EVP and then clear the codes and see if that helps first!

After that, just replace the EVP and then the DPFE.

Feel free to PM me for my phone number for further help my friend.
Good luck!

 

I agree with the recommendations stated.

Whats the DPFE, is it the sensor on top of the EGR?

I agree about the EVP (I have replaced mine about 3 times), its not sealed and does go bad from moisture. Sometimes it corrodes inside. You can pop off the cap on top if it and see inside it. Its located next to the coil with an connector and 2 vacuum lines going to it.

 

Where are these sensors located? and what all should I know as far as removing and cleaning my EGR?

 

The EGR sensor is located on top of the EGR valve, the O2 sensor is on your exhaust tubing just underneath the passenger side wheel well. You can't miss them. The EGR sensor if I remember correctly, you'll need a socket size 1/4 to get it off and to 02 sensor is a 23mm wrench. Put some penetrating lube on the big nut for your EGR and the 2 bolts holding the EGR on and try not to twist the pipe with nut on it. What I did is hit it the lube several times before I tried to take it off and it came off without any problems. Hope this helps

 

Is there any way to test these things to know which one may be my problem? The EVP isn't too expensive, like 40 bucks from napa, but the DPFE is 100. I don't want to just throw parts at it if I don't have to. Thanks

 

If you could take to napa or autozone they could read the codes for you. You should have the ODB-2 computer, so they should be able to help. If you have the ODB-1 which I doubt you'd have to take it to ford or try to read them yourself. Good luck

 

My truck is still OBD I and I have a scanner for it. I had code 172 and 334 stored, and code 334 in the KOER test.

 

I thought they quit putting the ODB-1's in them after 95, maybe it was just the F-150's they quit putting them in.

 

What is the DPFE?

 

Also, is there any way of checking if I have an injector going bad? From what I'v read it has the symptoms, hard to start after sitting hot, and starts easier when I floor it. Just trying to get her running right again

 

Alright man, since 172 is a memory code that means that you need to clear the computer. Your O2 sensor could have acted up one day and be fine now so clear the code either via the scanner or by disconnecting your battery overnight.

As for the EGR, do you even know where it is?
This is your EGR,

And located directly on top of the EGR, is your EVP.

In the first photo your can see the exposed threads on the bottom of the EGR, you will need to disconnect the pipe from there.
Then unbolt it from the manifold, disconnect the vacuum line, and disconnect the sensor wiring.
Pull it off, take a photo of inside it, and the intake port, and post it.
Then you need to go work with some degreaser and brake cleaner.
In the bottom where those exposed threads are, there will be a little pin looking peice. See if you can push it up into the EGR with a screwdriver or something. If it moves freely, good!
If it doesn't move freely, even after cleaning, then consider removing the entire assembly instead of buying a new EGR.
If that's the case, refer to this thread.
https://www.ford-trucks.com/forums/8...egr-valve.html

If that is all moving freely, just replace the EVP and see if that clears your code!

There is no way whatsoever to test your injectors yourself. I HIGHLY suggest pulling them all out and sending them in to WitchHunterPerformance.com
I sent mine to Gordon on a Monday and had them back on the next Monday!
It's $19/injector and $10 shipping.
When I sent mine in they were almost all jammed wide open, which is extremely bad! When he sent them back they were all operating like new!
I am extremely pleased with his service! For the money this is what he does,



DPFE (Delta Pressure Feedback of EGR)

 

IS the DPFE the thing over by the coil with the 2 vaccuum lines going to id. I thought it was the EVP.