P0175 p0172 p0650 long fuel trim -25.0 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cagodinez · 10-29-2016, 07:53 PM

Just checking to see if any1 has had this same issue, this is my second time driving her and it feels like she is missing some power. It's a 2008 5.3 gen IV with e38 ecm. I have not checked for any vacuum leaks or exhaust leaks.

TooTall · 10-31-2016, 12:29 PM

injector is not fully closing or it's a dirty MAF. Has the engine been sitting for a while?

I'm willing to be that it's a dirty MAF. Try cleaning it first and then rescann again

If the code reappears again, run the engine with no MAF.

cagodinez · 10-31-2016, 01:52 PM

Thank you Tootall I will definitely try that, and yes the engine has been sitting 4 at least 2 years.

TooTall · 10-31-2016, 01:54 PM

Quote:

Originally Posted by cagodinez

Thank you Tootall I will definitely try that, and yes the engine has been sitting 4 at least 2 years.

I would pull all of the injectors off, clean the fuel rail out, soak the injectors in SeaFoam, clean the screens and test

cagodinez · 10-31-2016, 02:35 PM

OK I will try that also.

cagodinez · 11-05-2016, 02:33 AM

I put in a new corvette fuel pressure regulater and the long fuel trim dropped down to -14, there is no change in fuel trim when I disconnect the MAF but, it runs a hell of alot better without it. So I'm still in the hunt for either a bad MAF, vacuum leak or stuck injectors.

10-29-2016, 07:53 PM	#1
cagodinez Registered User Join Date: Aug 2005 Location: Southern California Posts: 241	P0175 p0172 p0650 long fuel trim -25.0 Just checking to see if any1 has had this same issue, this is my second time driving her and it feels like she is missing some power. It's a 2008 5.3 gen IV with e38 ecm. I have not checked for any vacuum leaks or exhaust leaks. Attached Images

10-31-2016, 12:29 PM	#2
TooTall Registered User Join Date: Mar 2009 Location: League City,TX Posts: 66	Re: P0175 p0172 p0650 long fuel trim -25.0 injector is not fully closing or it's a dirty MAF. Has the engine been sitting for a while? I'm willing to be that it's a dirty MAF. Try cleaning it first and then rescann again If the code reappears again, run the engine with no MAF. __________________ 1973 K5, full vert, 6" BDS lift, 35 Mickey T MTs 1984 K10, 8" lift on 35s 2004 3/4 4wd, 33s Toyo Mts, Long Tube headers, 3K multidisk 80e, tons of miles 2011 Yukon XL \| Bone stock 2013 Audi Q5

10-31-2016, 01:52 PM	#3
cagodinez Registered User Join Date: Aug 2005 Location: Southern California Posts: 241	Re: P0175 p0172 p0650 long fuel trim -25.0 Thank you Tootall I will definitely try that, and yes the engine has been sitting 4 at least 2 years.

10-31-2016, 02:35 PM	#5
cagodinez Registered User Join Date: Aug 2005 Location: Southern California Posts: 241	Re: P0175 p0172 p0650 long fuel trim -25.0 OK I will try that also.

11-05-2016, 02:33 AM	#6
cagodinez Registered User Join Date: Aug 2005 Location: Southern California Posts: 241	Re: P0175 p0172 p0650 long fuel trim -25.0 I put in a new corvette fuel pressure regulater and the long fuel trim dropped down to -14, there is no change in fuel trim when I disconnect the MAF but, it runs a hell of alot better without it. So I'm still in the hunt for either a bad MAF, vacuum leak or stuck injectors.



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