silly question
Freshman User
Joined: Dec 2008
Posts: 35
Likes: 0
From: Sequim, WA
You need to check the DPFE (basically the EGR Pressure sensor). They are known to go out. Check the wiring and the tubes/hoses (make sure the tubes/hoses are not cracked or clogged)and check the voltage range with a DVOM. You mentioned you got a code for the DPFE saying that it is above .6 volts (or whatever). This may cause the symptoms you mentioned.
The reason you don't have any codes showing right now is probably (just my guess here and could be wrong) because when the code reader was hooked up and you didn't know how to use it, you/him could have erased the codes/reset.
The reason you don't have any codes showing right now is probably (just my guess here and could be wrong) because when the code reader was hooked up and you didn't know how to use it, you/him could have erased the codes/reset.
Freshman User
Joined: Dec 2008
Posts: 35
Likes: 0
From: Sequim, WA
Not completely but it will contribute to it. Also she mentioned one of the codes set were for the DPFE THAT is why I said to check it.
It could also be a few other issues: Fuel system, Cat restricted or the catalyist not performing, etc...
It could also be a few other issues: Fuel system, Cat restricted or the catalyist not performing, etc...
Fleet Mechanic
Joined: Mar 2005
Posts: 1,603
Likes: 1
From: St Louis
She stated the cats were hollowed out, unless the egr is stuck open, then a better look at a fuel system problem would be required. Especially after finding some cloudy fuel in the filter, and a rusted lock ring on the gas tank pickup/fuel pump.
Freshman User
Joined: Dec 2008
Posts: 35
Likes: 0
From: Sequim, WA
I missed that post about the cats being hollowed out So forget what I said about the cats. I guess my eyes are failing me. After putting in 18 to 20 hour days and getting old..... (in the process of buying out another shop makes for long days especially when you are trying to run another at the same time).I concur with checking the fuel system out, taking samples and inspecting them etc.. plus doing the usual pressure checks etc...
Thanks for pointing out about the cats alxsnmr. Time to get back to work now....
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New User
Joined: May 2009
Posts: 23
Likes: 0
alright...so , it's time for me to see how much you fellas know about fuel pumps..(no haven't tested the pressure yet--here's why) so drained the gas from the tank...tank is fine on the inside...rusted up real bad on the top..enough to where the lock ring is gone...so, we started playing with the fuel pump...to see if it was working properly...the truck was off and we turned the key on...heard the fuel pump engage, but no gas...then we try it again and it would spit gas...now i know there's a safety mechanism on them..it is not supposed to keep spitting gas if there is a break in the vacuum line (i think), but with the pump sounding like it's engaging with the key on shouldn't it spit gas out every time--whether there is a break in the line or not? we drained the gas out of the tank (into a clean bucket and hooked the pump back up with it sitting in the bucket)..now i know this isn't the best way to do it...ideally with a fuel pressure gauge...i know, but try convincing him of that 
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Freshman User
Joined: Dec 2008
Posts: 35
Likes: 0
From: Sequim, WA
The only good way to check the pressure is with the pump hooked up to the vehicle properly. Sure, you can test to see if its energizing and kicking on/off with it off the vehicle but you can't get a good reading this way. Hook it back up to the vehicle properly and take the reading. The pump may have a good reading off the vehicle but once hooked up you can see if the pressure is correct at the carb or injectors (depending on vehicle) this will also tell you if you have any restrictions in the fuel lines and filter. Also while you are doing a pressure test also do the volume test, because you can have the best pressure there is but if the volume isn't correct.......
