Changed MAF, runs poor

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Dec 30, 2011 | 02:50 PM

Hogdady

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Changed MAF, runs poor

01' Trans Am LS1. Just replaced MAF and now the engine has severe hesitation under moderate to hard acceleration. Did notice that MAF removed had no screen and new (Cardone) replacement does. Put original MAF back in and acceleration issue goes away. Any ideas?

Dec 30, 2011 | 02:52 PM

bene

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Why did you replace a perfectly good running stock MAF?

Dec 30, 2011 | 03:12 PM

Hogdady

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Quote:

Originally Posted by bene

Why did you replace a perfectly good running stock MAF?

Been having some intermittent poor running/stalling and hestitation issues coupled with lean fuel codes (PO 171, 174).

Dec 30, 2011 | 03:20 PM

bene

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I'm guessing you cleaned the stock MAF sensors already? Checked/replaced your fuel filter, did all the maintenance tune up?

Dec 30, 2011 | 03:39 PM

Hogdady

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Quote:

Originally Posted by bene

I'm guessing you cleaned the stock MAF sensors already? Checked/replaced your fuel filter, did all the maintenance tune up?

Cleaned OE MAF but it didn't clean up as well as I wanted. Was running a K&N but changed to paper today. Fuel filter, iridium plugs and wires yesterday. Below is the thread I posted which led me to change the MAF.

https://ls1tech.com/forums/pcm-diagn...ower-loss.html

Dec 31, 2011 | 05:54 AM

bene

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That's the thing... the only way to know your stock MAF sensor is bad is when you unplug the harness and drive it. It'll go to SD tune and if it drives better sans the MAF operating, you have a bad MAF. Or switch it with another one.

That code says it is leaning... Possibilities are: unmetered air going inside your engine, bad MAF, bad fuel filter/pump- not enough fuel or clogged injectors and O2 sensors aren't switching.