vacumm fitting on rear of 4.8 intake - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tbrown5079 · 11-22-2017, 11:30 PM

is the vacuum fitting for the brake booster on the rear of the intake on a 4.8 removable? I'm having P0171 and P0174 issues and the brakes don't seem to be consistent. It is loose where the booster hose goes on, and turns but doesn't get any tighter or looser. What's the deal?

homemade87 · 11-23-2017, 07:45 AM

That connection is normally a loose fit . It will turn and push in and out some but will still seal . If you want to take it off push in on the fitting and then depress the red tab and then pull it off .

I would think your issues are else where .

tbrown5079 · 11-23-2017, 01:42 PM

OK. Thanks for the response.

**truckdude239** · 11-25-2017, 10:13 AM

More then like the intake gaskets are leaking thats what normally causes those code come up together

tbrown5079 · 11-27-2017, 09:04 PM

That' s a thought, but I just replaced them with the gaskets they recommend, so I hope that is not it. I just get the faults sporadically so I was thinking it had something to do with the check valve on the booster or something like that.

11-22-2017, 11:30 PM	#1
tbrown5079 Registered User Join Date: Feb 2007 Location: Blairsville, PA Posts: 301	vacumm fitting on rear of 4.8 intake is the vacuum fitting for the brake booster on the rear of the intake on a 4.8 removable? I'm having P0171 and P0174 issues and the brakes don't seem to be consistent. It is loose where the booster hose goes on, and turns but doesn't get any tighter or looser. What's the deal? __________________ tbrown's 56 Cameo Build

11-23-2017, 07:45 AM	#2
homemade87 Registered User Join Date: Apr 2010 Location: Guntersville Alabama Posts: 1,073	Re: vacumm fitting on rear of 4.8 intake That connection is normally a loose fit . It will turn and push in and out some but will still seal . If you want to take it off push in on the fitting and then depress the red tab and then pull it off . I would think your issues are else where .

11-23-2017, 01:42 PM	#3
tbrown5079 Registered User Join Date: Feb 2007 Location: Blairsville, PA Posts: 301	Re: vacumm fitting on rear of 4.8 intake OK. Thanks for the response. __________________ tbrown's 56 Cameo Build

11-25-2017, 10:13 AM	#4
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,217	Re: vacumm fitting on rear of 4.8 intake More then like the intake gaskets are leaking thats what normally causes those code come up together __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

11-27-2017, 09:04 PM	#5
tbrown5079 Registered User Join Date: Feb 2007 Location: Blairsville, PA Posts: 301	Re: vacumm fitting on rear of 4.8 intake That' s a thought, but I just replaced them with the gaskets they recommend, so I hope that is not it. I just get the faults sporadically so I was thinking it had something to do with the check valve on the booster or something like that. __________________ tbrown's 56 Cameo Build



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