Smog pump delete with OBDII (dpfe)
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6th Gear
Joined: Jan 2004
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From: Lebanon, Tn
Smog pump delete with OBDII (dpfe)
I know this has been extensively covered, but there is some conflicting info out there regarding smog pump delete and OBD II system. I have a 1996 F150, 4.9 L. Just rebuilt head and I want to delete a locked up smog pump. I will keep EGR and DPFE systems in tact, block off AIR ports in head, remove smog pump and associated tubing, leave TAD and TAB solenoids plugged in and plug their corresponding vacuum lines. I have read a couple of post that says you cannot do a smog pump delete on a OBD II system. Does anyone know if that is correct?
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
The DPFE egr system cannot be deleted or disabled without setting a check engine light but that does not apply to the air injection system, some codes may still be set but they are not significant.
Cargo Master
Joined: Mar 2010
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From: Laramie, WY
It's interesting the 4.9L retained the air pump in 1996. The 5.8L's had an idler pulley in place of the air pump. Not sure on the 5.0L. Different catalysts I suppose.
As far as I know the only way around the dpfe is a custom tune. Mine EGR system has given me very little trouble over the years and continues to function correctly. If I recall, I've replaced the EGR tube once (preventatively during intake gasket job), dpfe sensor once, and the EVR once (it stuck open) in 20+ years.
As far as I know the only way around the dpfe is a custom tune. Mine EGR system has given me very little trouble over the years and continues to function correctly. If I recall, I've replaced the EGR tube once (preventatively during intake gasket job), dpfe sensor once, and the EVR once (it stuck open) in 20+ years.
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6th Gear
Joined: Jan 2004
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From: Lebanon, Tn
Wanted to update this thread. First thanks to all for comments and help provided. Put everything back together (deleted pump, retained tab1 and 2 solenoids with electrical connections, plugged associated vac line, used factory belt with a pump delete pully). Truck running very good with no check engine lights or codes thrown. Have about 150 miles on it. Thanks to all.
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6th Gear
Joined: Jan 2004
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From: Lebanon, Tn
Update on last post. My truck made a liar out of me. Drove about 20 more miles and code appeared with check engine light. P0411 code, problem with secondary air injection system. Obviously needs functioning air pump. Since my old pump locked up and started this whole fiasco, tired to purchase one and all places I checked were out of stock. Finally found a functioning pump at salvage yard. Replaced pump and reinstalled all parts of the AIR system. Truck running fine with no problems. The OBD II system will detect a malfunctioning A.I.R. system by monitoring air flow indirectly with O2 sensors. The only way to "fool" system is reprogram and I an not sure that is even possible. So if you are trying to remove air (smog) pump on a 1996 with OBD II system, you will get a code and you cannot easily bypass it, or at least I can't figure a a way.
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Fleet Mechanic
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That said, I suspect a "Mini cat O2 spacer" would solve your problem.
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Curious how you were able to determine this? I realize the post-cat O2 sensors will determine if the cat' is missing, but I didn't think there was code in there to detect a malfunctioning/missing AIR pump.
That said, I suspect a "Mini cat O2 spacer" would solve your problem.
That said, I suspect a "Mini cat O2 spacer" would solve your problem.
if it doesnt do either of those things, it knows theres a mechanical issue in the AIR system somewhere. Check valves, pump, pipes, etc.
It needs to run these tests more than once to eventually throw a code confidently
heres some info on the 96 4.9
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