2006 5.3 2WD Tahoe missing going up hill sometimes

[2006Tahoe2WD]

Document it over time. For example, 60 lbs initially, 45 lbs at 1 min, etc. Or use seconds if it's faster than that!

okay, thanks I'll do that.

 

[2006Tahoe2WD]

@Fless, I retested. I could see the top pressure when I turned the key but when I viewed the gauge it held very steady at 40psi and dropped very slowly almost not dropping at all. Was minutes and maybe down 2 psi.

 

[rockola1971]

@Fless, I retested. I could see the top pressure when I turned the key but when I viewed the gauge it held very steady at 40psi and dropped very slowly almost not dropping at all. Was minutes and maybe down 2 psi.

40 Psi aint gonna cut it. You have a bad fuel pump or an internal leak (IE: leaky injector).

 

[2006Tahoe2WD]

40 Psi aint gonna cut it. You have a bad fuel pump or an internal leak (IE: leaky injector).

That's with not started. When started goes right to 59-60psi. I guess what you are saying is if I do the key on test it should go to e.g. 60 and hold. Right?

 

[2006Tahoe2WD]

today I poured in Lucas fuel system cleaner and spray cleaned the MAF. Probably a fuel pump replacement is in my future sooner or later so I'm getting my mind around that. I plan to get a quote next week. I don't really want to DIY the fuel pump - too much splashing gas around and having the car in the air in the driveway for maybe a few days.

 

[rockola1971]

That's with not started. When started goes right to 59-60psi. I guess what you are saying is if I do the key on test it should go to e.g. 60 and hold. Right?

There is a spec and I believe its around 58-60+ psi. You are going to have to troubleshoot if its the pump or a fuel injector(s) leaking. Unmetered fuel getting let into a cylinder by a leaky injector(s) should cause a rich condition which a scanner should see in fuel trims and O2 sensors for that bank.

 

[2006Tahoe2WD]

I cleaned the MAF. Hard to tell if those small resister wires were dirty. The mesh looks cleaner now. I dumped in a bottle of the Lucas Fuel System Cleaner. I figured it can't hurt.
Considering replacing the injectors - found out they are somewhat spendy ($80-90) so holding off on that for now. What brand/model of injector is recommended? AcDelco ?
Ordered a Foxwell NT510 - I'll see if O2 sensors are acting nicely and watch fuel trim and mis-fires. I might be able to report some graphs here.

 

[Tonyrodz]

I cleaned the MAF. Hard to tell if those small resister wires were dirty. The mesh looks cleaner now. I dumped in a bottle of the Lucas Fuel System Cleaner. I figured it can't hurt.
Considering replacing the injectors - found out they are somewhat spendy ($80-90) so holding off on that for now. What brand/model of injector is recommended? AcDelco ?
Ordered a Foxwell NT510 - I'll see if O2 sensors are acting nicely and watch fuel trim and mis-fires. I might be able to report some graphs here.

@Doubeleive just posted a link for some oem injectors at a good price. Hopefully he'll post it here for you.

 

[2006Tahoe2WD]

@Doubeleive just posted a link for some oem injectors at a good price. Hopefully he'll post it here for you.

Thanks very much. Maybe at 171k miles they are ready to replace. I could send them to WitchHunter to get them checked and cleaned but then I'm down a car for a week or so.

 

[Doubeleive]

you can have injectors cleaned on the vehicle at many shops they just connect directly to the fuel rail and run the cleaner thru them instead of fuel usually cost about $80-90
but you can find decently priced injectors on herko automotive they have a regular website and they also sell on ebay

Herko Fuel Injector INJ560 For Chevrolet GMC Avalanche 1500 Express 1500 02-07 | eBay

Herko Automotive INJ560 OEM 25326903. New in Herko Automotive Box. Chevrolet Avalanche 1500 2005 5.3L 323Cu. V8 FLEX OHV Naturally Aspirated. V8 GAS OHV Naturally Aspirated. Replace Faulty Fuel Injector.

www.ebay.com