cam solenoid and P0171 Bank 1 Lean

IslandV70 · Post by **IslandV70** » 12 Mar 2019, 09:00

My car has been getting Cam Solenoid errors since I got it and also gets P0171. I took the solenoid off and cleaned it with Seafoam and an air gun with no changes

So I assume the thing is beat and will order another one today. They are easy enough to replace. Does the cam error cause the lean running error or do I have yet another thing to track down?

Post by **RickHaleParker** » 12 Mar 2019, 09:20

Most likely you have another problem to track down.

P0171 = ECM-250A Long-term fuel trim.

Diagnostic trouble code (DTC) information ECM-250A

Condition
The engine control module (ECM) receives information from the heated oxygen sensor (HO2S) about the fuel/air mixture at different loads. The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers that the fuel/air mixture deviates too much from target lambda value, leaving the long-term trim in one of its limit positions.

Substitute value
None.

Possible source
Upper limit:

Damaged/Dirty mass air flow (MAF) sensor
Low fuel pressure
Air leakage.

Lower limit:

Damaged/Dirty mass air flow (MAF) sensor
High fuel pressure
Leaking injectors
Leaking evaporative emission system (EVAP)
Contaminated engine oil
Oil level too high.

Fault symptoms

Malfunction indicator lamp (MIL) lit
Poor performance
May result in high fuel consumption.

IslandV70 · Post by **IslandV70** » 12 Mar 2019, 09:46

Looks like I might start with a MAF clean.

Post by **RickHaleParker** » 12 Mar 2019, 09:48

IslandV70 wrote: ↑12 Mar 2019, 09:46 Looks like I might start with a MAF clean.

Might as well. The MAF should be cleaned periodicity and it does not take much time.

chris11211 · Post by **chris11211** » 12 Mar 2019, 20:21

You night just have to dig in and clean the throttle body as well; as it gives off the lean fuel trim codes too.

IslandV70 · Post by **IslandV70** » 13 Mar 2019, 18:02

Funky star bits on the way.

Post by **RickHaleParker** » 13 Mar 2019, 18:27

IslandV70 wrote: ↑13 Mar 2019, 18:02 Funky star bits on the way.

Security Torx Bits.

A lot A lot of times you can turn the Security Torx bolt with the right sized flat-head screwdriver. You wedge the flat-head screwdriver along the post and the ends of the blade into two of the points of the star then twist.

EngineeringBloke · Post by **EngineeringBloke** » 14 Mar 2019, 08:58

Or grip the edge of the screw with a pair of pliers and twist! I used this myself.

IslandV70 · Post by **IslandV70** » 14 Mar 2019, 09:00

I already paid $10 for the security bits, so I'll just use them, but thanks for the ideas.

IslandV70 · Post by **IslandV70** » 05 Apr 2019, 13:35

Turns out my MAF is held in by screws, so no funky bits needed. Cleaning it was easy but it also did not change a thing