Alright so i think my maf sensor failed? It was driving great running great i do have a vacuum leak but nothing crazy i still get great gas millage in comparison the weather has been awesome here too so no water getting places it shouldn’t or freezing it also hasnt been scolding hot so all in all its not climate related but after parking over night i went to start the car and all the sudden it didnt want to idle and eventually stalled out i decided to check my air filter incase idk a friggen rabbit decided to make it home but again nothing crazy and i moved on in the midst of trying to sort the airbox i unplugged my maf sensor and forgot well i went to start the car and it started up great ran even better until i realized the lights on my dash notifying me something wasnt right i plugged it back in thinking all was fixed and again back to not wanting to run i can hold my foot against the kick down switch and it wont rev it jerks a bit reminded me of a carnival ride being tossed back and fourth anyway unplugged she runs great all the kick down i could ask for albeit the engine isnt happy obviously it doenst know whats going on and i can imagine the O2 sensors wont be doing much at that point so before i blow my cats up trying to get this sorted out can anyone tell me does this seem like a normal occurrence with the mass air flow sensors? Does this straight up tell me i need a new one? I plugged in a new one i had bought the spectra brand as it was 50% less then the $100 the hella or denso one cost im looking not to waste money on another maf sensor i did find a leak in a hose coming off the throttle body which has been fixed and i did find the part load breather hose wasnt fully connected so i connected that as well all done after the fact trying to remedy the situation all the best folks thank you for any help you may provide and have provided in the past i wasnt expecting to find myself back so soon but so far big money isnt being spent however i do have an appointment for it at my local dealership that has helped me sort my shifter out in the past which will cost an additional $100 simply for looking it over and diagnosis shop time etc… she still runs so good very smooth im thinking i may need to do coil packs at some point but it has had new plugs as of only a couple months ago now
x308 XJR 2001
-Jon

 

You can start by removing the MAF sensor and throughly cleaning it out. Or you could put the other one in there instead. If you have a scanner to plug in and clear the codes out, I’m sure that would help also.

 

so i removed it thoroughly cleaned it with wd40 specialist contact cleaner and that did not work zero effect i installed the new part though the restricted performance is gone its still doing the same thing cannot get it to move more then 5-10mph and jerks until i let off the gas then jerks again until i put gas down once more and each time i unplug the maf it runs good not great doesnt like to stop at signs much i put the old one back in and its wayyy worse with the old one actually makes it stall out havent had it stall on the new one but the minute i put the new one in it was reving up and down my code reader doesnt let me do anything except retrieve codes
codes with new sensor are
P0112 “intake air temperature sensor curcuit 1 low input”
P0102 “mass airflow circuit low input”
P0442 “evap emissions leak detected (small)”
leak has been corrected but wont recognize it yet i just fixed it so once i get it running im sure that will clear itself out
also the Fuel pressure doesnt show on my reader and yes i do have a fairly expensive reader not the professional snapons but the innova series 2nd to best of the best they have to offer

 

Please, clean with MAF sensor cleaner only and let dry.... before to try again.

 

alright and in the event that fails too? Then how do i proceed?
WD-40 specialist is residue free no oil involved or anything that will be left behind i just checked with there customer service team

 

I must admit, I’ve not heard of the WD40 specialist contact cleaner before. It is my belief that whenever someone sees “WD40”, a lot of people would just hone in on that and instantly think of the regular WD40.

Anyways, moving on. If you have a small pocket screwdriver or pick, you could go back to the MAF electrical connector and on the backside, gently but firmly push the pins towards the MAF sensor for a more positive contact. As the plastic ages, the miniature locks within the electrical connector don’t hold the female pins as well as they have in the past and can push their way out. Once you do this, clear the codes again before starting.

 

I did this and it did not work this happened over night it was driving just fine the day before so whatever happened happened by it sitting either after driving that evening prior to the morning of and letting it have time for heat to build up before dissipating as everything is switched off no fans running no coolant pumping something i did do with the original sensor in was tapping the maf sensor with the handle of a screwdriver and yeah that worked to get it to idle out smooth idk what is inside it that could even become lodged in anyway i wouldnt think there is but i figured for hell of it why not also could have just been coincidence and thank you addicted2boost its been a while i didnt even notice it was you!

 

Yep....one of the wonderful things about plastic!

 

sadly i really doubt this to be the issue im leaning more towards a potential throttle body issue or my neighbor screwed with my car one or the other guess ill be checking out that crankshaft sensor in a few minutes as well as the other various things im now aware of like the boost valve on both of the charge coolers the opposite side connector to the part load breather connecting to the valve cover on bank 2 since i plugged that thing in it has been incredibly peppy but this this persistent issue peppy is only so much fun the part i bought was a spectra premium maf sensor part number below
For 1998-2003 Jaguar XJR Mass Air Flow Sensor Spectra 58843RNYY 1999 2000 2001

i cannot find any information on this part being used in my car yet it’s available on various sites including parts geek i know the xjr and xj8 use different maf sensors correct me if im wrong but the temp sensor is included in the S/C model no?
my old maf was labeled S/C denso this part is roughly $130 i can get the hella one locally for roughly $40 less but now i must look like rain man after the failed attempts thus far ive been prompt to return all of the parts ive ordered to hopefully start fresh being that the new maf sensor is throwing codes that were not there its showing clear signs of a part that doesnt want to function with the vehicle and is essentially “confusing” things i also took note in a JTIS that the charge coolers are supplied via the throttle body through a hose connecting the two what is the likelihood this may have separated to a point of which its no longer even a “part” anymore and now more of an open candy wrapper? Lol

 

I would definitely get this used oem one
LNE1620BB S/C MAF sensor. Ignore the X100 reference. Picture #8 shows the part number and the S/C on it. I’d return the Spectra and get this one. I’ve not had real good luck with the aftermarket MAF sensors. I also don’t think you need to worry about the crankshaft sensor being messed with as it wouldn’t show those codes if it went bad.

https://www.ebay.com/itm/23554424178...mis&media=COPY

 

Man you are a savior and that price yessir paying now lol i suppose i will update on arrival thank you addicted2boost