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.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.