No start

[Shaw520]

Recommended fuel pressure for your 4.8 is 55-62psi,...a local shop can quickly check fuel pressure,...or you can get an inexpensive gauge and diy,.... with that amount of mileage if it hasnt been replaced I would suspect pump,.... do pump and filter at same time.

 

[Rick Dupuis]

Recommended fuel pressure for your 4.8 is 55-62psi,...a local shop can quickly check fuel pressure,...or you can get an inexpensive gauge and diy,.... with that amount of mileage if it hasnt been replaced I would suspect pump,.... do pump and filter at same time.

Even if I hear the pump and it starts, you suspect the pump

 

[Shaw520]

Only way to know for sure is pressure test,... the testers are pretty affordable and theres a shrader valve right on top of the rail,...very easy to access and knowledge is important in this case. The pump motor could be working but not creating enough pressure,...or inline filter could be clogged....but most time its the pump,... rarley have I seen a fuel delivery issue solved by just replacing filter,... because theres a pre-filter on the pump.




https://www.walmart.com/ip/Auto-Fue...4406&wl11=online&wl12=949950671&wl13=&veh=sem

 

[Rick Dupuis]

Only way to know for sure is pressure test,... the testers are pretty affordable and theres a shrader valve right on top of the rail,...very easy to access and knowledge is important in this case. The pump motor could be working but not creating enough pressure,...or inline filter could be clogged....but most time its the pump,... rarley have I seen a fuel delivery issue solved by just replacing filter,... because theres a pre-filter on the pump.

Ok, thanks, I will get one.


https://www.walmart.com/ip/Auto-Fue...4406&wl11=online&wl12=949950671&wl13=&veh=sem

Ok, I will get one, thanks

 

[kurtibm]

My buddy brought over one that he borrowed and it gave a code for MAF sensor and lean on bank 1

This article will show you how to test the MAF on your GM car, pick up, or SUV using a digital multimeter and without using a scan tool. All you need (to diagnose and troubleshoot the MAF sensor) is a digital multimeter capable of reading Hertz (Hz) frequency.
http://easyautodiagnostics.com/gm/4.8L-5.3L-6.0L/testing-the-maf-sensor-1
If the issue is in the pigtail, this one may fit-the-bill- ACDelco PT1274.
Check if yours is 4 or 5 wire and if rounded ends on the connector.

http://easyautodiagnostics.com/gm/4.8L-5.3L-6.0L/p0120-tp-sensor-tests-1?highlight=WyJwMDEyMCJd

 

[Rick Dupuis]

This article will show you how to test the MAF on your GM car, pick up, or SUV using a digital multimeter and without using a scan tool. All you need (to diagnose and troubleshoot the MAF sensor) is a digital multimeter capable of reading Hertz (Hz) frequency.
http://easyautodiagnostics.com/gm/4.8L-5.3L-6.0L/testing-the-maf-sensor-1

http://easyautodiagnostics.com/gm/4.8L-5.3L-6.0L/p0120-tp-sensor-tests-1?highlight=WyJwMDEyMCJd

Thanks for this info, I will try this when I get home tonight

 

[kurtibm]

Thanks for this info, I will try this when I get home tonight

Sure. A cheapie (<$20) wired (Autel, etc.) code reader may still be a decent investment, as there are myriad codes that can cause a hard/no start and/or limp mode and the code can be (temporarily) reset to get you on your way safely. Also, Kobra (and others) makes an android OBD scanner - 'bout $13.

 

[Rick Dupuis]

Sure. A cheapie (<$20) code reader may still be a decent investment, as there are myriad codes that can cause a hard/no start and/or limp mode and the code can be (temporarily) reset to get you on your way safely. Also, Kobra makes an android OBD scanner - 'bout $13.

Cool, I’m old school, so I will stick to the multimeter till I get and learn how to operate a scanner. Thanks

 

[kurtibm]

So, was it the MAF sensor?

 

[Doubeleive]

a bad MAF can cause what your experiencing I would try cleaning it first, if the problem doesn't go away after cleaning it then swap it out, there not expensive and a used one will probably last for years as well.