P0174 & this part? Related?
#1
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So I got the P0174 yesterday and checked for obvious air leaks today, using the tissue paper method. No luck.
Pulled the MAF and cleaned it. While I was waiting for it to dry, I poked around some more and saw this.
It's towards the back of the bay. No idea what it does. Plugged it back in and cleared the codes. Nothing so far.
Any idea what this thing is/does?
Pulled the MAF and cleaned it. While I was waiting for it to dry, I poked around some more and saw this.
It's towards the back of the bay. No idea what it does. Plugged it back in and cleared the codes. Nothing so far.
Any idea what this thing is/does?
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Bigvettefreak (12-17-2015)
#3
#4
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#5
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#6
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I had po171 and po174. lean on both banks. Usually a intake leak. Replaced all intake O rings. replaced the crankcase vent valve. Not the problem. Check for leaks. (Smoke the car) none! Add a o ring to the end of oil dipstick. A lot of times the seal is bad. Also check Oil cap
After all that I still pulled the codes. Replaced MAF. Reset the ECU battery off 30 mins. Been about 6 months since no more codes. I guess the faulty MAF was giving incorrect readings because there was no un metered air entering the intake.
During the time it had these codes, I got 22-25 mpg in the city. So not a fuel problem, ruled that out.
After all that I still pulled the codes. Replaced MAF. Reset the ECU battery off 30 mins. Been about 6 months since no more codes. I guess the faulty MAF was giving incorrect readings because there was no un metered air entering the intake.
During the time it had these codes, I got 22-25 mpg in the city. So not a fuel problem, ruled that out.
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Don B (12-06-2015)
#9
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Yes anindyams car is supercharged.
That hose connects the outlet of the supercharger to the reference port of the fuel pressure sensor.
On my XJR that hose was in 3 pieces with barb fittings, I also had a leak from that line. All the joins are now held on tight with cable ties, and i've got no leaks
That hose connects the outlet of the supercharger to the reference port of the fuel pressure sensor.
On my XJR that hose was in 3 pieces with barb fittings, I also had a leak from that line. All the joins are now held on tight with cable ties, and i've got no leaks
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#10
#11
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Good luck buddy
#12
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#13
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#14
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#15
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#16
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what side of the engine was this vacuum plug on?? on and did you remove the engine cover? i will assume you did. i have the same code and it keeps coming back even after changing both O2 sensors .. i will also have to do the hard reset thing, that may also help. ( even i can do that! hahahahaha ) my Mechanic did not do that. He used his meter thing.
My car is a 2006 XJ8L with 156K on it and i love it.. just need to stop this pesky code. Mechanic said he found no exhaust leaks so that is not causing it. i have printed out the pictures so he can check for that plug as well. thank you.
#17
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If you're facing the car, it's on the right side back towards the windshield. You have to take the cover off to see it. I ziptied it and cleared the code with my obdii reader. Hasn't come back since.
Had the car in at the Indy mechanic for some other stuff and had him smoke test it. Found no other leaks.
When I plugged it back on, it stayed, but leak was still there. After ziptying it, it seemed to have fixed the issue.
Had the car in at the Indy mechanic for some other stuff and had him smoke test it. Found no other leaks.
When I plugged it back on, it stayed, but leak was still there. After ziptying it, it seemed to have fixed the issue.
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Bigvettefreak (12-19-2015)
#18
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P0174 causes (according to the book):
Engine misfire
Air intake leak between MAF Sensor and cylinder head
Fuel filter / system restriction
Fuel injector restriction
IP Sensor fault (lowfuel pressure)
Low fuel pump output
HO2 Sensor(s) (2/1, 2/2) harness wiring condition fault
EFT Sensor fault (lowfuel temperature)
MAF Sensor fault (lowintakeair flow)
Exhaust leak (before catalyst)
ECM receiving incorrect signal from one or more of the following components:
ECT Sensor, MAF Sensor, IAT Sensor, IP Sensor, EFT Sensor, TP Sensor
Engine misfire
Air intake leak between MAF Sensor and cylinder head
Fuel filter / system restriction
Fuel injector restriction
IP Sensor fault (lowfuel pressure)
Low fuel pump output
HO2 Sensor(s) (2/1, 2/2) harness wiring condition fault
EFT Sensor fault (lowfuel temperature)
MAF Sensor fault (lowintakeair flow)
Exhaust leak (before catalyst)
ECM receiving incorrect signal from one or more of the following components:
ECT Sensor, MAF Sensor, IAT Sensor, IP Sensor, EFT Sensor, TP Sensor
#19
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I think what Patrick the Cat is saying is the code could come from a lot of sources, but it's probably a leak somewhere.
I got lucky, but I confirmed the fix after having the smoke test done that there were no other leaks. I never did the rest, btw.
If you leave it too long, I'm told you'll burn out your catalytic converter, and that will be very expensive.
I got lucky, but I confirmed the fix after having the smoke test done that there were no other leaks. I never did the rest, btw.
If you leave it too long, I'm told you'll burn out your catalytic converter, and that will be very expensive.
#20
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His is a SC engine so your regular XJ8L won't be setup the same way.
As was posted above that is the fuel pressure reference point for intake pressure/vacuum for the fuel injectors. So the fuel pressure will increase with the boost.
I am surprised you did not get more codes or some kind of drivability problems with it unhooked? Under boost your fuel pressure will be too low.
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As was posted above that is the fuel pressure reference point for intake pressure/vacuum for the fuel injectors. So the fuel pressure will increase with the boost.
I am surprised you did not get more codes or some kind of drivability problems with it unhooked? Under boost your fuel pressure will be too low.
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