Soo moonshot came to soon, need advice (200k)

Fuel injectors prop never been treated or replaced.
Best to replace instead of wasting money on treatment.
I'm having hisatation problems,
What else should I be looking at......
I do have blue smoke on cold start up, not to thick..... Any advice there too.
Any other


2007 denali

Just guessing, But injectors imo wont cause hesitation but rather a miss/rough idle and throw a code for a particular cylinder. I wouldent rule out throttle body or gas pedal if your "drive by wire". i would seriously be looking at fuel pump pressure or somthing as simple as bad fuel? A little blue smoke on start up at 200k is probably your new normal at that mileage unless it is also somthing as simple as blowby feeding oil through the rocker/plenum vac circuit. do you use a catch can? worst case is a stem seal/seal's on the valves. pull the plugs and if the threads on the plugs are wet but the plugs arent fouled than imo stem seals are failing. A dripping injector could produce your smoke on cold start. but would be accompanied by a miss until the cylinder started firing again.

Rosson03 said:

Fuel injectors prop never been treated or replaced.
Best to replace instead of wasting money on treatment.
I'm having hisatation problems,
What else should I be looking at......
I do have blue smoke on cold start up, not to thick..... Any advice there too.
Any other


2007 denali

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Diagnose it before throwing parts at it. Do you have something to check for misfires, fuel trims and graph your oxygen sensors?

swathdiver said:

Diagnose it before throwing parts at it. Do you have something to check for misfires, fuel trims and graph your oxygen sensors?

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No I don't, does Ken Towery have things like that

Rosson03 said:

No I don't, does Ken Towery have things like that

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Probably but with 2.7 stars, if it were mine, I'd pay the dealer for a diagnosis.