Truck died on the road about a week ago and had fuel problems whether air or gas. So got it home and every so often throughout the week I would start it up idle for about five minutes drop rpms and die and then every time you start it up like within 30 minutes that time would just keep dropping and …

[image] P0171 OBD-II Trouble Code: System Too Lean (Bank 1) P0171 code definition System Too Lean (Bank 1) What the P0171 code means The P0171 OBD-II code means that, on the first bank of the engine, the fuel system is running weak or a vacuum leak exists near this side of the engine. A.…

Likely a bad fuel injector since it only affects bank 1

I’m also thinking it could be the Ecm because I had a misfire caused by the maf so that could be fried also

Is there a particular reason you think it might be an ECM problem? Like perhaps the engine & passenger compartments both got wet etc? Or the ECM has been removed and inspected several times already? B/c removing it , if not done properly could shock-damage parts. ECM’s if left alone are usually…

Your ecm can get problematic if you have a misfire like It could destroy it

I suppose it could happen, but I’d put that on the lower priorities of possibilities to consider. I mean if that’s the only reason you think you might have a bad ECM.

[image] Sawyerernst: thinking it could be the Ecm Doubtful because the truck is still running. A bad ECU is a guess, not a diagnosis.

you never said what year or engine you have. How To Fix – Chevy Silverado P0171 Trouble Code - My Pro Street (prostreetonline.com)

Having a little trouble believing the article since the 2005 Silverado did not come with a 5.7 engine and I’ve never seen a multimeter with a Hz function. I’ve seen a lot of freq meters but never a multimeter with that function.

How to measure frequency using Multimeter - Inst Tools (instrumentationtools.com) agree about the year. I think it was a 5.3 that year

P0171 code

Maintenance/Repairs

Tester November 13, 2021, 8:31pm 2

Tester

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P0171 code

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