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06-30-2012, 10:58 AM #1
- Join Date
- Mar 2009
- Location
- Georgia
- Posts
- 6
Burgundy- 86 Monte
Service Engine Soon Light On ???"s
I have a 2001 Camaro Z28 with 91K miles on it,the only mods on it are K&N filter,SLP air lid,SLP MAF sensor and SLP cat back exhaust,I was driving the car the other day and the Service Engine Soon light came on and I went to Advance Auto and checked the light and the codes P0171 bank 1 too lean and P0174 bank 2 too lean was given,what do these codes means and which bank is which?THANKS
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06-30-2012, 11:20 AM #2
- Join Date
- Apr 2010
- Location
- Alabama
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- 3,625
Black/ Silver- 98 TA WS6/ 01 C5 Corvette
Have you had a tune for the SLP MAF? If not that could be the cause since it is much larger than the stock MAF plus aftermarket units usually need a good tune to work properly and even then they sometimes don't. I actually would ditch the slp MAF and either go back to the factory one or get a SD tune to get rid of the MAF all together. You could also clean your MAF and see if that helps. I would also check you O2 sensors.
The codes mean that you car has detected a lean condition on each side of the car. I believe bank one is the drivers and bank two is the passengers iirc. This means there is too much air and not enough fuel coming in, that us why I mentioned the tune. A lean condition can cause engine detonation. Damaged O2s can cause a false code though.Last edited by 98TransAmWs-6; 06-30-2012 at 11:24 AM.
1998 Trans Am WS6 - Phantom
421 CI LQ9, Tick Performance Custom Cam, TFS 255cc LS3 heads, Kooks 2" LT headers, Kooks 3" True Duals w/ high flow cats, FTP 104 lid, Speed Density Tune, 4" silicon tube, LS6 VCT, FAST 102 Intake, NW 102 TB, Oil Catch Can, SLP Bilstein Shocks w/ Vogtland Springs, CTS-V 4-piston Calipers w/C6 Z06 rotors, Stainless Steel Brake Lines, R1 concepts premium rotors, Hawk HP+ brake pads, VFN WSQ Hood, C5-R timing chain, SLP oil pump, E85 tune, Walbro 450 fuel pump, Deatschwerkz 95# injectors, Breathless performance headlights, Frost Tune, !HVAC.
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06-30-2012, 04:02 PM #3
Will is correct. Generally speaking, the O2 sensor is responsible for "reporting" the lean condition to the PCM. The PCM will try to correct for this, but only within certain parameters. If the O2 sensors are reporting a false lean condition, then the problem could be with the O2 sensors themselves, or with the MAF, if it is reporting less air than it is actually taking in to the PCM.
As it happens, the MAF's inputs are given top priority by the PCM, so if it is "lying," everything else will be skewed.
I don't necessarily agree with getting it tuned out, but a tune to account for the "upgrade" could definitely fix the problem, if the PCM is misinterpreting the SLP's MAF readings.
Given that both banks are showing lean, rather than individual cylinders, I would check the MAF first (clean it with some MAF cleaner), then clear the codes and see if they come back. If they do, you may need a tune. If a tune doesn't fix it, both your front O2 sensors may be bad.
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06-30-2012, 07:13 PM #4
- Join Date
- Jan 2010
- Location
- East of Cleveland, Ohio
- Posts
- 3,827
Black- 99 WS.6 - Modified
Agree with Naaman. A GM MAF is highly recommended, as aftermarket ones tend to cause problems. Also, swap out the K&N filter for a paper one. The oil on the filter will get on the MAF's sensors, causing problems as well.
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07-01-2012, 05:21 AM #5
Everytime I remember that I've got a K&N type filter, I consider changing it back to a paper one.... They are a PITA to maintain.
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07-01-2012, 05:48 AM #6
- Join Date
- Mar 2009
- Location
- Georgia
- Posts
- 6
Burgundy- 86 Monte
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07-01-2012, 08:21 AM #7
- Join Date
- Jun 2011
- Location
- Branchville, NJ
- Posts
- 3,111
Silver & Blue- 02 Camaro SS, 04 GTO
I think it's the O2 sensors. I have a SLP MAF and when the engine is cold and I give it more then 1/2 throttle the SES light will come on. The code id for MAF not lean banks. After a drive cycle the SES light will go out by itself. It happens so often I do not even reset it anymore.
My ride is a 2002 Camaro SS SLP #3296 with 30k, LTH, 3" Y, CME, Frost tune, K&N, ported TB, Blackwing lid, Bellows, MSD, Denso Iridium, and 85mm MAF, Bilsteins, Eibach springs, SLP strut brace, Adj. Panhard, TA Girdle, UMI, Pro 5.0, Nitto NT555
My wife has a 2004 GTO with the rare SAP, 18" wheels, K&N Cold Air System, MSD, Ported TB, Frost tune, Denso Iridium, Flowmaster cat-back, 3200 Yank, 75k
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07-02-2012, 01:19 AM #8
- Join Date
- Mar 2009
- Location
- Georgia
- Posts
- 6
Burgundy- 86 Monte
How do I reset the SES light?THANKS
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07-02-2012, 05:36 AM #9
Yep, I agree. Sooner or later the MAF will get a slight build up on it's surface that you might not be even able to see with a casual look. There's just no way you can avoid a build up with an oil charged filter. CRC the MAF and the Throttle Body but more importantly send it to Frost whether the light goes out or not.
Magnaflow Quad Tip, Lid, SBellow
UMI: FTC, FSB, RSB, LCA's, PBAR, SFC's, T-Arm w/relo, D/S Loop
Kooks LTH, 3" YP, H/F Cats
Custom Grind Cam, Stall, 3:73 rear
Bilsteins w/Strano Springs Conti Super Contacts
TuneByFrost MSD Wires
Cross Drilled/Slotted Rotors w/Ceramic
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07-02-2012, 07:32 AM #10
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