Check Engine Light?
Thread Starter
Burning Brakes
Joined: Nov 2007
Posts: 1,002
Likes: 0
From: Virginia Beach VA
Check Engine Light?
First a little background:
Purchased new in NOV 07, it's an 07 Type 2LT, A6 9100 Miles, SLP CAI and Superflo Cat Back exhaust - no flash/tune. The CAI and exhaust have been on since about 2000 Miles. 93 Octane in the tank. 88 PCT oil life remaining.
The check engine light came on yesterday (this is the third time since I took delivery). Every time this has happened it's been in the 40's F for ambient temp and @ highway speeds (55-70). All the analog dash gauges are well within their respective nominal values indicating no significant or dire problems. The previous two times I simply pulled the negative battery terminal once I returned home and the check engine disappeared not to return (anytime soon). It's been about 4-5 months between events and this car is a daily driver (3 days a week to work and back). This last time, I've decided not to pull the battery terminal and let the check engine light "ride." I eventually intend bring the car in to the dealer for a sniff of the OBD II to see what the code/fault is.
Question: Has anyone else experienced a similar issue when the temp is in the 40s, and does anyone have a guess at what the fault might be? just curious.
Purchased new in NOV 07, it's an 07 Type 2LT, A6 9100 Miles, SLP CAI and Superflo Cat Back exhaust - no flash/tune. The CAI and exhaust have been on since about 2000 Miles. 93 Octane in the tank. 88 PCT oil life remaining.
The check engine light came on yesterday (this is the third time since I took delivery). Every time this has happened it's been in the 40's F for ambient temp and @ highway speeds (55-70). All the analog dash gauges are well within their respective nominal values indicating no significant or dire problems. The previous two times I simply pulled the negative battery terminal once I returned home and the check engine disappeared not to return (anytime soon). It's been about 4-5 months between events and this car is a daily driver (3 days a week to work and back). This last time, I've decided not to pull the battery terminal and let the check engine light "ride." I eventually intend bring the car in to the dealer for a sniff of the OBD II to see what the code/fault is.
Question: Has anyone else experienced a similar issue when the temp is in the 40s, and does anyone have a guess at what the fault might be? just curious.
Thread Starter
Burning Brakes
Joined: Nov 2007
Posts: 1,002
Likes: 0
From: Virginia Beach VA
Update:
Went to my local friendly Chevrolet Dealer (R.K.) here in Virginia Beach and told them CEL (Check Engine Light) was on. I asked the service writer to read the code. He was more than happy to; we plugged his OBDII scanner in and we were rewarded with "P0174" "Bank 2 System Too Lean."
This appears to be a good thing and is likely caused by a random hiccup due to my CAI and Cat-Back exhaust. We decided to clear the fault via the scanner and see if it returns. I somehow doubt it will (soon anyway). So in light of this I just went out and purchased a basic OBDII scanner with read and erase capability (cheap - actron PocketScan Plus $59.00). This way I can just clear it without driving all over town next time.
Went to my local friendly Chevrolet Dealer (R.K.) here in Virginia Beach and told them CEL (Check Engine Light) was on. I asked the service writer to read the code. He was more than happy to; we plugged his OBDII scanner in and we were rewarded with "P0174" "Bank 2 System Too Lean."
This appears to be a good thing and is likely caused by a random hiccup due to my CAI and Cat-Back exhaust. We decided to clear the fault via the scanner and see if it returns. I somehow doubt it will (soon anyway). So in light of this I just went out and purchased a basic OBDII scanner with read and erase capability (cheap - actron PocketScan Plus $59.00). This way I can just clear it without driving all over town next time.
Racer
Joined: Oct 2008
Posts: 265
Likes: 1
I had this exact same problem on my new stock '08. C/E light 3 times.
Temp in the 40s and I would get a lean condition on one or both banks.
Turns out there was a TSB that covered this (at least on a stock motor). There are holes in the header panel that the snorkle mounts to. These holes pull in air and apparently can cause swirling in the intake track. The TSB calls for the holes to be covered with a Dynamat type material. My dealer did this and the problem has never come back.
Not being stock, your situation is probably due to tha CAI causing the same type symptom.
Safety Car
Joined: Dec 2007
Posts: 4,974
Likes: 148
From: Magnolia Texas
most likely a MAF input due to the CAI. like other poster, I had several CEL's on my '08 when it was new and in working with the engineers at BG, came up with the sealing of holes and spaces near the air intake. problem solved for over 9000 miles to date. one other thing to try - believe it or not, switching to Chevron (top-tier fuel) also worked the problem prior to the tape solution. not sure why but it worked. if you aren't running top tier fuel, try some Chevron supreme and see if that helps. good luck!
Racer
Joined: Jul 2007
Posts: 368
Likes: 0
From: Big Spring Texas
Check engine light came on my 08 back in june, and come to find out there was some type of paper hanging down blocking the air flow in the air duct. Ordered a new air duct and never has happened again.
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Thread Starter
Burning Brakes
Joined: Nov 2007
Posts: 1,002
Likes: 0
From: Virginia Beach VA
I had this exact same problem on my new stock '08. C/E light 3 times.
Temp in the 40s and I would get a lean condition on one or both banks.
Turns out there was a TSB that covered this (at least on a stock motor). There are holes in the header panel that the snorkle mounts to. These holes pull in air and apparently can cause swirling in the intake track. The TSB calls for the holes to be covered with a Dynamat type material. My dealer did this and the problem has never come back.
Not being stock, your situation is probably due to tha CAI causing the same type symptom.
Temp in the 40s and I would get a lean condition on one or both banks.
Turns out there was a TSB that covered this (at least on a stock motor). There are holes in the header panel that the snorkle mounts to. These holes pull in air and apparently can cause swirling in the intake track. The TSB calls for the holes to be covered with a Dynamat type material. My dealer did this and the problem has never come back.
Not being stock, your situation is probably due to tha CAI causing the same type symptom.
Racer
Joined: Apr 2008
Posts: 373
Likes: 2
From: White Plains NY
there has been so much talk about intake and the maf throwing codes. could you replace the maf w/ a different one that is not so sensitive or is it in the programing? everyone says that as soon as you get a tune all the problems seem to stop as far as the intake code go.
Mike
Mike
Safety Car
Joined: Dec 2007
Posts: 4,974
Likes: 148
From: Magnolia Texas
Thread Starter
Burning Brakes
Joined: Nov 2007
Posts: 1,002
Likes: 0
From: Virginia Beach VA
there has been so much talk about intake and the maf throwing codes. could you replace the maf w/ a different one that is not so sensitive or is it in the programing? everyone says that as soon as you get a tune all the problems seem to stop as far as the intake code go.
Mike
Mike
Ahhh, but here's the rub, I don't want to void my warrenty with a tune. I think I'm in that "happy place" right now with regards to the fact I know what's causing it and now have a simple tool to clear the fault when it happens - occasionally. If it were a persistently reoccurring fault I'd be tempted to return the CAI to OEM (I retained all the original parts).
I'd still like to know where to plug these "holes" that markr01000 is speaking of; again - pics anyone?
Racer
Joined: Apr 2008
Posts: 373
Likes: 2
From: White Plains NY
Ahhh, but here's the rub, I don't want to void my warrenty with a tune. I think I'm in that "happy place" right now with regards to the fact I know what's causing it and now have a simple tool to clear the fault when it happens - occasionally. If it were a persistently reoccurring fault I'd be tempted to return the CAI to OEM (I retained all the original parts).
I'd still like to know where to plug these "holes" that markr01000 is speaking of; again - pics anyone?
I'd still like to know where to plug these "holes" that markr01000 is speaking of; again - pics anyone?