car is bone stock, spitting a cel code of p1174, "manufacturer controlled air/fuel mixture, any ideas?

 

Heres what it says about the p1174

The Fuel Trim Cylinder Balance diagnostic detects a rich or a lean cylinder-to-cylinder air/fuel ratio imbalance. The diagnostic monitors the pre-catalyst heated oxygen sensor (HO2S) signal's frequency and amplitude characteristics by calculating an accumulated voltage over a predetermined sample period. An imbalance is indicated when multiple samples of the accumulated voltage are consistently higher than the desired value.

Heres some things you can check.

•Inspect the air induction system for modified, damaged, leaking, or restricted components.
•Inspect the crankcase ventilation system for improper operation.
•Inspect the vacuum hoses for splits, kinks, and improper connections.
•Inspect for vacuum leaks at the intake manifold, the throttle body, and the injector O-rings.
•Test for a restricted, damaged, leaking, or modified exhaust system from the catalytic converter forward. Refer to Symptoms - Engine Exhaust .
•Test the fuel injectors for improper operation. Refer to Fuel Injector Diagnosis .
•Test for fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
•Test for excessive fuel in the crankcase due to leaking injectors.
•Test the ignition system for improper operation. Refer to Electronic Ignition (EI) System Diagnosis .
•Test the engine for any mechanical conditions such as sticking valves, lifters, etc., which could alter the flow into the combustion chamber


Also the Map sensor could be reading incorrectly or the O2 sensor.

Found this as well

SES Light With No Engine Performance Concerns And A P1174 DTC - Reprogram ECM - keywords calibration CEL ECM light MIL PCM repeat SES #PIP3968

On rare occasions, a SES light may be experienced with no engine performance concerns and a P1174 DTC. This PI does not apply if there are any engine performance concerns or other engine performance DTCs, such as a P0300.

Recommendation/Instructions:
If the SI diagnostics do not isolate a cause for this concern, reprogram the ECM with the latest engine calibration. At this time, the latest engine calibration are titled "new calibration with diagnostic enhancements for DTCs P1682 and P1516 and fix for stall immediately after remote start", This calibration, or any that follow, is designed to address this concern.

THis to

SES Light Due To A P1174 DTC - Perform Injector Test With AFIT - CH47976 - keywords active balance cylinder engine fuel injector lamp light misfire miss P0300 test tester #PIP4017A - (01/18/2007)

Condition/Concern:
On rare occasions, a SES light may be encountered due to a P1174 DTC. In some instances, a P0300 may also be stored. This may be due to a fuel injector concern on one of the cylinders that a Tech 2 fuel injector balance test may not isolate.

Recommendation/Instructions:
If the SI diagnostics do not isolate a cause for this concern, use the Active Fuel Injector Tester (AFIT - CH47976) to perform an "Injector Test" as outlined in the AFIT User Guide. The AFIT "Injector Test" measures the flow characteristics of all fuel injectors, which is more precise when compared with the standard Tech 2 fuel injector balance test. As a result, the AFIT is more likely to isolate the cause of a P1174 DTC if it is being caused by a fuel injector concern.. The CH-47976 (Active Fuel Injector Tester - AFIT) can also be used to measure fuel pressure and fuel system leak down.

Also, as mentioned in the P1174 SI diagnosis, if the misfire current counters or misfire graph indicate any misfires, it may be an indicator of the cylinder that is causing the concern.

 

How much would a dealer charge to recalibrate the ECM? All I got left is powetrain warranty.

 

check ur ground wires next to the stater i had a loose ground when i got that problem...fixed the wires n i was good to go...juss a thought

 

Yeah I have the same issue I think anyone get this fixed under emissions warranty, I'm in Canada?

 

bump

 

I have had this code twice now and had it cleared at advance auto. Anyone having this too? I have a CAI but no other performance modifications. Do I need to get my ECM recalibrated? Any help would be much appreciated.

 

Anytime you install an aftermarket CAI your chances of throwing a code greatly increase. I have an Injen and it will throw a CEL every now and then. Only way to truly get rid of it is to have your car tuned.

 

Thank you sir! I installed the CAI 60k ago and only recently started throwing codes. I guess I can keep clearing it until I get a tune.

 

If your mainly stock I wouldn't worry too much about it. Mines been doing that for about 4 or 5 months and can't tell that anything is wrong, besides I get the CEL, which usually goes away on its own in a couple days.

Got to get a tune here anyway because I just put on a catted DP and am about to put my Stage 2 parts on. Hopefully can get that taken car of while I'm there.

 

Thanks for the help. I have gone straight to get the code cleared the day after it shows up so maybe it will clear itself if given a chance like yours does.

 

bump-- just threw that code today. No performance upgrades- 2.4 SS/NA. My concern- threw it on our way down to Myrtle Beach- Have to drive home to Buffalo in a few days. Engine is not acting abnormal at all. We brought a code reader with us and cleared the code- Haven't drove it too much since. Anyone think I would have a problem driving back???

 

bump^^^^

 

Having the light on does not mean it will hurt the car to drive with it. An emissions code usually has very little to do with the way the engine actually runs, and if it's driving normal still then you should be fine.

 

The light wasn't flashing when it did come on. I just dont want to get stuck half way home and would rather fix whatever we need to when we have family a few hours away from here if need be.