Perhaps a silly question on p0171/0174
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I have a friend that has a 2000 XKR. He is a little bit of of contrarian and tries at times to ignore the obvious and see something others do not. Not being critical but I always work upward from the broad-base and not at a smaller point.
He has the classic P0171 and 074 codes with the scanner showing a run up to +25 on both sides. The air intake is new and so the problem is not the common one in the bellows -I am thinking the egr screws and some the tubes in that area. However it has been suggested that perhaps the oil filler cap has a dry o-ring and that would cause the problem. There is no leaking oil form the oil cap.
Does a dry -o-ring on the oil filler cap have any relationship to a +25 on the fuel trims and thus the P0171 and 0174 codes.
A further question- if the MAF was bad would we not see codes like P0101-0106?
Thanks for your help.
Tom in Dallas/Plano
He has the classic P0171 and 074 codes with the scanner showing a run up to +25 on both sides. The air intake is new and so the problem is not the common one in the bellows -I am thinking the egr screws and some the tubes in that area. However it has been suggested that perhaps the oil filler cap has a dry o-ring and that would cause the problem. There is no leaking oil form the oil cap.
Does a dry -o-ring on the oil filler cap have any relationship to a +25 on the fuel trims and thus the P0171 and 0174 codes.
A further question- if the MAF was bad would we not see codes like P0101-0106?
Thanks for your help.
Tom in Dallas/Plano
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First the filler cap will have no affect here on fuel trims.
Second is he has modified the intake, did you perform a hardreset after the update so the FT can be reset and relearn? Check the plugs on the maf as well, if not connected correctly he maybe having false readings.
Second is he has modified the intake, did you perform a hardreset after the update so the FT can be reset and relearn? Check the plugs on the maf as well, if not connected correctly he maybe having false readings.
If the plugs were not properly connected on the MAF, would not the continuing monitoring of the MAF by the pcm cause a code to show.
I, however, have warned him not to be driving the car until fixed or he is putting in lots of gas to compensate and while we have not seen a flashing CEL (does that occur on this model and year) he may well do damage to the cats.
Tom in Dallas/Plano
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Tom in Dallas/Plano
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Do not think the vacuum leak is that easy to find below the throttle with spray. I am certain that this is the problem and fix and just trying to cut off other avenues that are a waste of time.
A.
Remove the air intake, remove the Throttle Body, 4-10mm bolts, 2- 8mm bolts
3 electrical connections, 2 hoses.
The bolts for the EGR have come loose allowing the lower throttle body to suck in raw air after the MAF. AKA VACUUM LEAK
they are two 8mm, simply tighten them or replace them if they are missing.Don't over tighten.
B.
The black plastic tube that runs from the passenger lower throttle body inlet has a grommet that's worn allowing air in,pull out a lil, wipe with a clean towel, apply rtv around it, push back in, let dry overnight.
C.
There is a ambient air temperature sensor that will have oiliy residue, its on the passenger side rear upper manifold, like 22mm socket to remove I think.
Wipe the tip with a clean towel. Lightly rtv its copper washer and screw back in tight so its not leaking.
Those will cure your problems and take 25 mins to complete. You will have to reset your codes with the scanner or remove the negative, an hold it it on the positive for 30 secs. If you do that, you will have to do the window re-learn, have your radio code If applicable, and reset your clock..
But back to the original question- anyone heard of dry o-ring on the oil cap causing a problem?
Tom in Dallas
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Tom
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