Surge /miss between 1700-2000 is gone
- Thread starter JD's04
- Start date
I disconnected the DPFE sensor
What the hell is that?
Marc
What the hell is that?
Marc
where is the DPFE sensor located?
I was just going to say the same thing. That and I don't think it is wise to unplug ANY sensor. They all have a purpose. I would have taken it to a shop or the dealer to get the issue fixed the right way. It isn't an issue on all Cobras because mine was fine. Never once had any sign of surge/miss.
Does replacing the DPFE work?
Again, see earlier threads for more information.
I have replaced my DPFE ($80) and EGR solenoid ($25) and I still have the driveability issue though its not quite as bad as before.
Researching this there's some thought that the root cause of the issue is a sticky EGR valve (presumably clogged with exhaust particles or otherwise gone bad).
I intend to replace my EGR valve ($80) soon to test that theory.
I have replaced my DPFE ($80) and EGR solenoid ($25) and I still have the driveability issue though its not quite as bad as before.
Researching this there's some thought that the root cause of the issue is a sticky EGR valve (presumably clogged with exhaust particles or otherwise gone bad).
I intend to replace my EGR valve ($80) soon to test that theory.
Finally found time to replace the EGR valve that's been sitting on my garage shelf for ages. The old valve still appears to work properly but I fitted the new one just to see.
BTW, you can fit a new EGR and gasket without taking the cables and driver side sensors off the blower as instructed in the shop manual but man, it's a real PITA to do the job that way.
The gasket coming apart also didn't help as half stuck to the blower facing. A pain to clean it all off way back there.
Same as before the stumbling/misfire driveability problem remains at 1500 rpm but nowhere else when using very light throttle. Damn, that is depressing.
A buddy of mine who races says he used to have similar problems with narrow band O2's in the injected cars he used to run on the street and sometimes at the track. He said the sensors age and become slower in their response time and that might be the cause of the ECU mismanaging the EGR. He thinks there's a good chance the stumble might be fixed by replacing the O2's.
My rears are already programmed off in my tune.
How much would a new set of front O2's run?
If not too bad I might test this theory out soon and pick up a couple.
BTW, you can fit a new EGR and gasket without taking the cables and driver side sensors off the blower as instructed in the shop manual but man, it's a real PITA to do the job that way.
The gasket coming apart also didn't help as half stuck to the blower facing. A pain to clean it all off way back there.
Same as before the stumbling/misfire driveability problem remains at 1500 rpm but nowhere else when using very light throttle. Damn, that is depressing.
A buddy of mine who races says he used to have similar problems with narrow band O2's in the injected cars he used to run on the street and sometimes at the track. He said the sensors age and become slower in their response time and that might be the cause of the ECU mismanaging the EGR. He thinks there's a good chance the stumble might be fixed by replacing the O2's.
My rears are already programmed off in my tune.
How much would a new set of front O2's run?
If not too bad I might test this theory out soon and pick up a couple.
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