trouble codes, hesitation, restricted performance
#1
trouble codes, hesitation, restricted performance
My Jag xk8 is hesitating during acceleration and returning the system lean code which if i remember right is 171 and 174. I have read through all the blogs here and checked all the breather tubes and cleaned the TB and mass air flow.
I have 110 thousand trouble free miles on the car. Seems to do fine when it is cold and it is getting worse more now everyday
I have read through Alldata and the autozone computers systems and they all say it is the down stream o2 sensors, so i naturally check my car but find I only have 2 o2 sensors and not 4. The autozone computer return no parts for a C model motor and there is a C in my vin code. Any help would be appreciated
I have 110 thousand trouble free miles on the car. Seems to do fine when it is cold and it is getting worse more now everyday
I have read through Alldata and the autozone computers systems and they all say it is the down stream o2 sensors, so i naturally check my car but find I only have 2 o2 sensors and not 4. The autozone computer return no parts for a C model motor and there is a C in my vin code. Any help would be appreciated
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#5
I purchased my 99 XK8 sight unseen out of state, with the same codes. Got a great deal because of it, and it turned out to be the snorkel tube from the air cleaner to the throttle body was brittle and cracked on the undersideof the "accordian" portion. Did a careful taping job and fine for 11 months now.
#6
finally figured it out
In case anyone is still fallowing this thread if figured my problem out.
Turns out to be the mass air flow sensor, although i cleaned it in the tube a half dozen times, this time i took it out of the tube and cleaned in all the hidden holes especially the heater wire section that could not be cleaned from it sitting in the tube. worked perfect ever since.
Turns out to be the mass air flow sensor, although i cleaned it in the tube a half dozen times, this time i took it out of the tube and cleaned in all the hidden holes especially the heater wire section that could not be cleaned from it sitting in the tube. worked perfect ever since.
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#8
I wish my ongoing problem with P171, and P174 codes was as easy to find. My Jag is at the second Shop now, since the first mechanic gave up on finding the root problem. These guys have now had it since last week, and they too are stumped so far! They have given it two Smoke Tests to date, so unfortunately for me, it is not just a Vacuum Leak.
Not fun!
Brian
Not fun!
Brian
#10
#11
Join Date: Sep 2008
Location: Damon /Houston, Texas
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brian, if the plastic air tubes are all good, then the other known issue for these codes on THIS car and the XJ is the mass air flow sensor.. you can try and clean keeping your fingers crossed, but I replece them since people here useally dont like to have to keep coming back for the same issues
#14
i would check that maf again
like i said i cleaned my mas air flow sensor about 6 times. but i didn not get into one hole that has the other two wires i think they are the heater wires. I also cleaned up the throtal body with a lintless rag and carb cleaner. again then it ran fine. so im thinking mainly it was those heater wires that were dirty. check with your mechanic and see if he took the maf out of the tube to clean it.
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171, 2000, chart, code, codes, flow, jag, jaguar, obd, perfomance, performance, restrected, restricted, trouble, xj8, xkr
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