360 P0174

Need some tech advice please.

I have had an ongoing rough idle on my 03/360- CEL has come on 2 X - both times scanned with OBD2 with code P0174. `bank 2 running lean`

I`m ready to clean the MAF sensor as the probable solution. I have secured the special torx bit (t25 btw, not t20 as maybe the myth) and CRS MAF cleaner.

Q:
- which side in bank 2? (ie: which MAF sensor should be cleaned?)
- tips or tricks to un-plug the sensor without damage to the wiring harness?

thanks

 

More likely to be a vacuum leak........

You need to monitor the O2 sensor voltages, smoke test the intake. But, it can be from the MAF sensor, on a 360 I would expect a code on each bank if that were the case....

 

Clear codes - car off - wait 5 min - swap MAF's from side to side - does code come back on the OPPOSITE side?

If so, suspect MAF

If not, suspect something else.

 

Might try the swap from side to side and see if the code reappears for left bank. thanks

 

On advice from this forum, ive tried to carefully scan the engine bay for any signs of a vacuum leak and have found the rubber hose inlet that bridges between the throttle body and intake manifold to be kinked and not fully clamped against the flange...could this be the cause of the "running lean condition" and the P0174 code. I was prepared to clean the MAF's but have held off...advice please.
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Fix the obvious first. Could def. be the problem

 

Test it! propane torch not lit, run gas right in front of the hole. Listen for change in idle. No change = that's not the problem
change = there's your vacuum leak

 

That will be it.....

 

thanks - will attempt repair

 

That's where your unmetered air is coming from.

 

1+
also use a hose with the propane and get it as closer you can on the head gaskets with the manifold.

 

Update
- removed air intake hose and installed it properly with new clamps...reset CEL...drove it for 50km +/- ... CEL is back.

-Next step- MAF clean...to be continued.

 

The code is triggered as a result of a problem. That initial problem can have other effects. Consider that the air leak may contribute to a full enrichening of the mixture which could then pollute an oxygen sensor, which could.......etc., etc..

Diagnostics involve more than just reading off a number, it could be showing an effect rather than the problem. the car should be monitored to try and pinpoint the problem better. you may have fixed the original problem and now are chasing the secondary result.