The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Project 67 DRGNWGN

**kev2809** · 01-22-2023, 05:00 PM

well had a little time to play with the truck while I wait for the booster setup. I took my multi meter and checked the MAF for 12 volt and ground with key and both checked out. my multimeter don't have hertz, so I couldn't check that. but if it's getting power and ground, I figured the MAF may be failing. I replaced with a new one and have the same problem. cranks the second time and idles fine, but bogs under acceleration, and even a little backfire it seems when I rev it in park.

so I rented a fuel pressure tester from. O'Reilly's. I found some off readings. I'll post the picture below, but with key on, and with the engine running... the psi didn't change and showed really low. I tried this gauge on my 2002 avalanche 5.3, and it showed 55, so I know the gauge is working

opinions? I have some time to kill until I get the booster in so I figured I would try and narrow down this stumbling issue.

01-22-2023, 05:00 PM	#945
kev2809 low n' slo Join Date: Mar 2009 Location: rosenberg, texas Posts: 5,141	Re: Project 67 DRGNWGN - 67 Burban!! well had a little time to play with the truck while I wait for the booster setup. I took my multi meter and checked the MAF for 12 volt and ground with key and both checked out. my multimeter don't have hertz, so I couldn't check that. but if it's getting power and ground, I figured the MAF may be failing. I replaced with a new one and have the same problem. cranks the second time and idles fine, but bogs under acceleration, and even a little backfire it seems when I rev it in park. so I rented a fuel pressure tester from. O'Reilly's. I found some off readings. I'll post the picture below, but with key on, and with the engine running... the psi didn't change and showed really low. I tried this gauge on my 2002 avalanche 5.3, and it showed 55, so I know the gauge is working opinions? I have some time to kill until I get the booster in so I figured I would try and narrow down this stumbling issue. Attached Images __________________ 67 1/2 ton Suburban - Project DRGNWGN. Build thread -_--_--_ _________ _--_-_ -/____\|__\|__\__ ,.,,,.,.,,.,\|_O _______ O_] Last edited by kev2809; 01-22-2023 at 05:18 PM.