SMOG Nightmare P1174 P1171
#1
SMOG Nightmare P1174 P1171
!!!!!!!!!!!!!!!!!IT'S ALL FIXED!!!!!!!!!!!!!!
Alright I have read a lot of forums have taken it to two shops and have fixed quite a bit of things still cant get codes to go away. I have been dealing with this for a few months now and can't figure it out. I have a brand New MAF according to shop the shop it was last at it is getting normal signal from the O2 sensors so those don't seem to be bad have had two smoke test done and have had all leaks eradicated and still have codes. Last shop has ran two full tanks of as with a fuel injector cleaner in it to try to see if that helped and they keep coming back. I can get about 100 miles before the code comes back. I need some help to point me in the right direction to where or what i should be looking for.
It is a 2003 Disco 2
125,000 Miles roughly
Head gaskets spark plugs/wires done @100,000mi
New O2 sensors around 90,000mi
Let me know what other info would be helpful
Thank you in advance for the help.
Alright I have read a lot of forums have taken it to two shops and have fixed quite a bit of things still cant get codes to go away. I have been dealing with this for a few months now and can't figure it out. I have a brand New MAF according to shop the shop it was last at it is getting normal signal from the O2 sensors so those don't seem to be bad have had two smoke test done and have had all leaks eradicated and still have codes. Last shop has ran two full tanks of as with a fuel injector cleaner in it to try to see if that helped and they keep coming back. I can get about 100 miles before the code comes back. I need some help to point me in the right direction to where or what i should be looking for.
It is a 2003 Disco 2
125,000 Miles roughly
Head gaskets spark plugs/wires done @100,000mi
New O2 sensors around 90,000mi
Let me know what other info would be helpful
Thank you in advance for the help.
Last edited by aarcaris94; 10-04-2016 at 10:21 AM.
#3
#4
What are your long & short term fuel trim measurements for each bank? I know you replaced the MAF sensor, but was brand/part number was it?
Have you examined the tube between the MAF and throttle body? Smoke tests usually don't evaluate this section, and I have seen cracks here in the past.
Have you examined the tube between the MAF and throttle body? Smoke tests usually don't evaluate this section, and I have seen cracks here in the past.
#5
What are your long & short term fuel trim measurements for each bank? I know you replaced the MAF sensor, but was brand/part number was it?
Have you examined the tube between the MAF and throttle body? Smoke tests usually don't evaluate this section, and I have seen cracks here in the past.
Have you examined the tube between the MAF and throttle body? Smoke tests usually don't evaluate this section, and I have seen cracks here in the past.
#6
Was the smoke test done with a "professional" machine or with a cigar and your lungs? A friend of mine had the same problem and although we did our best with a cigar one Sunday afternoon we never did locate the leaks. A couple years have now passed and he long since sold the truck without solving the problem, but based on continued reading on this forum I am now convinced that his problem was the fuel injector O-rings. For one thing they are more difficult to detect with a cigar smoke test, and, like you we had eliminated everything else.
#7
Was the smoke test done with a "professional" machine or with a cigar and your lungs? A friend of mine had the same problem and although we did our best with a cigar one Sunday afternoon we never did locate the leaks. A couple years have now passed and he long since sold the truck without solving the problem, but based on continued reading on this forum I am now convinced that his problem was the fuel injector O-rings. For one thing they are more difficult to detect with a cigar smoke test, and, like you we had eliminated everything else.
#8
What are your long & short term fuel trim measurements for each bank? I know you replaced the MAF sensor, but was brand/part number was it?
Have you examined the tube between the MAF and throttle body? Smoke tests usually don't evaluate this section, and I have seen cracks here in the past.
Have you examined the tube between the MAF and throttle body? Smoke tests usually don't evaluate this section, and I have seen cracks here in the past.
#9
You have short term and long term numbers? Post it on youtube.
In general, your long term numbers shouldn't be much outside the range of -3% to +3%. Any greater discrepancy and your ECU is likely compensating for an issue(other than it being an old truck). Short term can vary much more, but dead spots or big variances from cylinder to cylinder can indicate a bad sensor. The best way to look at short term is to graph the values, using Torque app or something similar.
In general, your long term numbers shouldn't be much outside the range of -3% to +3%. Any greater discrepancy and your ECU is likely compensating for an issue(other than it being an old truck). Short term can vary much more, but dead spots or big variances from cylinder to cylinder can indicate a bad sensor. The best way to look at short term is to graph the values, using Torque app or something similar.
#10