2003 Silverado P0171 & P0174 OBD II Codes TSB 3232?

TSB-GENIII Cold Engine Misfire at Idle with P0171 and/or P0174-I didn't have any trouble finding it. BUT are you experiencing a cold rough idle that goes away as the engine warms up? & Randome misfires at an idle? If not, then this Bulletin will probably not help you. If you are then: 1. Check for leaking intake manifold seals around the intake ports. If they are leaking, replace them with updated part#89017589. The new ones are teal green & the old ones are orange. 2. Check the intake plenum for warpage. If it is warped, then you will need to replace it, too..

Another thing to look for if you have a P0300 DTC, too:

1. Perform a fuel injector balance test on all 8 cylinders.

2. Inspect Oxygen sensors for corrosion or water intrusion.

3. Check for excessive exhaust backpressure.

Some other things to check for:

1. Inspect the Secondary Air Injection System for proper operation.

2. If the fuel pressure is too low, then it will set these DTC's.

3. Check Vacuum hoses for defects, splits, & proper connections.

4. The system will go lean if an injector is not supplying enough fuel. The lean condition is most likely present during high fuel demand.

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RE:

2003 Silverado P0171 & P0174 OBD II Codes TSB 3232?

Tough question, I know....But, I have a 2003 Chevy silverado and the check engine light has been coming on for about 4 weeks. I ran a scan which resulted in P0171 and P0174 OBD II Codes. These indicate that fuel rails (or banks) are running lean on both sides. A internet search revealed that TSB...

Obd2 Code P0171

go to a ford dealer, walk in the back and ask a line mechanic--when was the last fuel system service interval? you need to find all this stuff out if you dont want problems--take care of the little things and the big things will take care of themselves. you could just have a clogged fuel filter--the fuel pump will buzz for 2 seconds when you turn the key and then go off. it reacts to low line pressure. if you hear that, then the filter is a prime suspect that is often forgotten.

The repair for this is to re flash or reprogram the ECU on your truck Most repair shops are not set up for this so a trip to the dealer maybe the only fix.GM tech for 20 years

Here is your answer and the web site.

# TSB #3232 -- MISFIRE AT IDLE COLD AND POSSIBLE P0171 AND OR P0174. *EH (NHTSA ID #10011692, no date provided)

http://www.carcomplaints.com/Chevrolet/Express_Van...

Replace the Pcv valve and the 02 sensor next to the catalic converter