engine running lean and throwing codes?
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engine running lean and throwing codes?
hey all, having some problems with my mom's 2002 x-type 2.5 auto
the car is throwing 2 codes:
P0171
P0174
i looked them up and they're for lean conditions on both banks.
i originally thought it might be a defective MAF, but in my experience when those are going the pcm compensates by dumping extra fuel, not taking it away.
it gets a bit wierder too, the codes are always there, if you clear them they're back in minutes even at idle, BUT the actual check engine light only comes on when it's REALLY cold, likecolder than -10 degrees celcius (about 14F) and will clear itself (the light not the code) when it warms up.
any ideas?
thanks
the car is throwing 2 codes:
P0171
P0174
i looked them up and they're for lean conditions on both banks.
i originally thought it might be a defective MAF, but in my experience when those are going the pcm compensates by dumping extra fuel, not taking it away.
it gets a bit wierder too, the codes are always there, if you clear them they're back in minutes even at idle, BUT the actual check engine light only comes on when it's REALLY cold, likecolder than -10 degrees celcius (about 14F) and will clear itself (the light not the code) when it warms up.
any ideas?
thanks
RE: engine running lean and throwing codes?
Hey f0rge n welcome to the forums......no intro huh? Just straight in there with a problem.....lol
Sorry I can't help you mate, but maybe Buck, Nineball, Bo or one of the more Tech minded guys might.
Someone will be along soon to try n help out I'm sure
Jim
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RE: engine running lean and throwing codes?
ORIGINAL: Dennis
The fix for both them codes P0171 and P0174,is to Replace the Upper and Lower Intake Air Control Valve, O-rings and gaskets...
The fix for both them codes P0171 and P0174,is to Replace the Upper and Lower Intake Air Control Valve, O-rings and gaskets...
Senior Member
Joined: Jun 2007
Posts: 421
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From:
RE: engine running lean and throwing codes?
any odd idling issues i.e. rough? What's it holding at at idle?
From my experiences w/the 2.5L, the IAC gets a bunch of soot very often. There's also a high pich sound emitted from the IAC in colder climates that leads to a rough idle. If postponed, it will throw a check engine light.
From my experiences w/the 2.5L, the IAC gets a bunch of soot very often. There's also a high pich sound emitted from the IAC in colder climates that leads to a rough idle. If postponed, it will throw a check engine light.
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ud
Joined: Jan 2008
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RE: engine running lean and throwing codes?
ORIGINAL: f0rge
ouch that sounds expensive...a lot of labour? possible to do myself or better left to a jag tech?
ORIGINAL: Dennis
The fix for both them codes P0171 and P0174,is to Replace the Upper and Lower Intake Air Control Valve, O-rings and gaskets...
The fix for both them codes P0171 and P0174,is to Replace the Upper and Lower Intake Air Control Valve, O-rings and gaskets...
The job is fairly easy..Here are the Control Valves..
Senior Member
Joined: Nov 2007
Posts: 142
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From: NYC
RE: engine running lean and throwing codes?
if nothing else works, try looking in this thread. https://www.jaguarforums.com/m_29194...3/tm.htm#31994
Those codes sound familiar . . .
Those codes sound familiar . . .
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Joined: Nov 2006
Posts: 29
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RE: engine running lean and throwing codes?
Just had the exact same problem a couple weeks ago, i replaced the Intake Air Tuning Valve O-rings, two of them and the problem went away. No more check engine light and the car runs great. Real cheap and easy to do. Parts are like $20 and labor takes like 5 minutes.
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RE: engine running lean and throwing codes?
ORIGINAL: smokinjag
Just had the exact same problem a couple weeks ago, i replaced the Intake Air Tuning Valve O-rings, two of them and the problem went away. No more check engine light and the car runs great. Real cheap and easy to do. Parts are like $20 and labor takes like 5 minutes.
Just had the exact same problem a couple weeks ago, i replaced the Intake Air Tuning Valve O-rings, two of them and the problem went away. No more check engine light and the car runs great. Real cheap and easy to do. Parts are like $20 and labor takes like 5 minutes.
i finally looked under the hood and the labour looks super easy so i think i'm gunna try to tackle this in the next couple of days
Veteran Member
Joined: Sep 2006
Posts: 5,671
Likes: 4
RE: engine running lean and throwing codes?
Hey forge look also at the tube that runs front to back and is under the plastic cover. If the tube there is cracked try replacing that tube and see what happens. Fortunately for me that fixed my problem when my car threw those codes. If fixed some other peoples codes and didn't fix others...its worth a $3 dollar tube though! Look at the pic...if nothing were saying here fixes it search all the links anyone gives on here...shaguar had the same problem but my fix didn't fix it! LINKY
Senior Member
Joined: Nov 2007
Posts: 142
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From: NYC
RE: engine running lean and throwing codes?
ORIGINAL: aquill1
Hey forge look also at the tube that runs front to back and is under the plastic cover. If the tube there is cracked try replacing that tube and see what happens. Fortunately for me that fixed my problem when my car threw those codes. If fixed some other peoples codes and didn't fix others...its worth a $3 dollar tube though! Look at the pic...if nothing were saying here fixes it search all the links anyone gives on here...shaguar had the same problem but my fix didn't fix it! LINKY
Hey forge look also at the tube that runs front to back and is under the plastic cover. If the tube there is cracked try replacing that tube and see what happens. Fortunately for me that fixed my problem when my car threw those codes. If fixed some other peoples codes and didn't fix others...its worth a $3 dollar tube though! Look at the pic...if nothing were saying here fixes it search all the links anyone gives on here...shaguar had the same problem but my fix didn't fix it! LINKY
Veteran Member
Joined: Sep 2006
Posts: 5,671
Likes: 4
RE: engine running lean and throwing codes?
Thats funny because my hose is just goodyear radiator hose...they gave me the hose for free! It was the connector/coupler that cost the money in the fix! Although it was cheap!
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Joined: Feb 2008
Posts: 85
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From: Chicago Burbs
RE: engine running lean and throwing codes?
I am resurrecting this old thread to see if anyone knows where to get the O-Rings for the Air Control Valves? Did you just take the o-rings off and get something in the same size from a hardware store? I have not been able to find them online or at a parts store. I guess if I have to I can go to the dealer. Thanks