Question about 1999 Chevrolet Silverado 2500

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1999 Silverado 6 liter has quit, code reader says too lean

Service light came on, and then soon the truck was stalling at idle.
My code reader said too lean at both upstream oxygen sensors, I replaced sensors, but truck soon quit completely.
I have replaced fuel filter, checked/cleaned air filter,EGR, fuel pressure regulator.
I am new to the code reader, not sure if I should expect it to be telling me if the fuel pump is toast, computer is shot, etc. Not sure where to go with this right now.
Fuel sending unit was replaced 3 years ago.
Truck has 135k miles.
Thanks, Bob Miller

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  • evenkeel95 Jan 05, 2009

    Thanks, but getting the truck towed to a shop to be tested ($120 for the tow, 3 days and $1000 for the service, minimum), negates any benifit from subscribing to your promising service. Bob Miller.

  • evenkeel95 Jan 05, 2009

    The engine is turning over just fine. So again, my question of the moment is: if the code reader is not indicating problems with, for example, the fuel pump, does that mean the problem is not the fuel pump? Thanks for your help! Bob Miller

  • evenkeel95 Jan 05, 2009

    It would help me to know if the code reader is expected to tell me if the fuel pump is defective before I drop the gas tank on a pretty narly fishing expedition. Thanks! Bob

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Let's get right to the root of the problem, and dismiss most of the other alleged solutions, by starting with the basics:
Exactly what was the code that your code reader provided you? Without that vital piece of info, it is truly hard to give you an ACCURATE solution.

Posted on Jan 05, 2009

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First test fuel presure and flow. If okay, I'd be looking at either a restricted exhaust (cat. converter) or an vacuum or air inlet concern. Hope this gets you in the right direction. Good Luck and please leave rating foer me. Thanks.

Posted on Jan 05, 2009

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If this vehicle is having an intermittent problem that will not show up on a code reader. The reason why the truck quit is not because of the oxygen sensors I can guarantee that, it something else. Here is what you do: Your vehicle needs a few things to run AIR, FUEL AND SPARK. Check to see which is missing and get back to me asap. Most likely gas or maybe spark.

Posted on Jan 05, 2009

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Hi,
it's a fuel pressure problem. may be because of fule pump.

Thanks for using FixYa.

Posted on Jan 05, 2009

  • rockfixya
    rockfixya Jan 07, 2009

    did u check the fule pressure?


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Hi and welcome to FixYa,

Initially, remove the air filter. Try spraying with injector cleaner and start. If it starts but falters or wouold seem like to start, then it would be a fuel issue.

Remove at least one of the sparkplug wire. Start. Remove the sparkplug where the wire was removed and visually inspect if wet with fuel. If yes fuel is being delivered, injector is working. Connect the sparkplug wire back to the plug but the plug not back into the hole. Lay it onany exposed metal portion. Crank the engine. Visually check if there is spark at the end/electrode of the plug. If none, possibly fouled plug or ECM/ECU/PCM computer issue.

Pls post back results of tests.

Good luck and Thank you for using FixYa.

Posted on Jan 04, 2009

  • Louie  Role
    Louie Role Jan 05, 2009

    Of course test/checks would have to be revised if it were the turbo diesel version.

  • Louie  Role
    Louie Role Jan 05, 2009

    Another possibility is the lift pump. It is a fuel filter looking secondary inline fuel pump. If one is installed in your truck, it would somewhere directly below the driver seat on the underchassis.

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Welcome to Fixya! Ok-When you say Dead-It wont Crank or anything or are you getting some things to work like Turning over at all?

Posted on Jan 04, 2009

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I think it needs to be checked at a diagnosis center to get the proper code which will tell the exact fault from where we can continue further and locate the exact fault.

Posted on Jan 04, 2009

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