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Hi,
I have a problem with the diagnosis being a leaking injector since there are four others that get used a whole lot more. Have you got information that these have ever been a problem child on other 900s?
If it is truly losing rest pressure then is it flooding the engine. So the amount will be laying in the intake manifold waiting every time? Is it that repetitive?
So if it cranks does it hit some right away?
Do you think it turns so suddenly rich that it swamps all the plugs at once? That would take a tremendous amount of fuel. Do you smell raw fuel?
Then more cranking goes alone to where it runs leaner somewhere along the line.
Is there a roughness with the idle for a tiny bit?
On some units there is no cold start or its activation, unless, it’s really cold. This is where a coolant sensor can be faulty.
Then, after it’s kicking over it all switches back to normal as the fuel pump catches up to filling up the rail and makes the injectors spray correctly.
The cold start injector, if it is bad, is not just going to stop leaking.
The management system will adjust or reduce the pulse width on all the injectors to compensate.
This all happens so fast that there is no need for a cold start injectors most of the time. Even in Wisconsin. It’s spring time now on a warm engine.
So with that what is going on could be the coolant sensor or a leaky FPR couldn’t be a cause.
Could be bad or intermittent in-tank fuel pump or really rare a bad check valve on the main fuel pump.
Are problems worse with less fuel in the gas tank?
For me there are too many other choices to go with and cold start valve being a definitive fix.
Once the shops get your hood up past the cost of a diagnosis it can turn into a “free for all” on your wallet being held open to see how deep of a pocket it came out of.
I don’t have any idea how long and how often looked for clues without showing proof and right themselves out an excuse disclaimer at the same time either.
If it was me I cracked open my tool box or internet and start investigating the normal directions of troublesome causes without the shops hourly labor rate from what they quoted you!
Like it was said, in the thread that valve is not that hard to access.
Be careful using that same shop. You got away from them with minor injuries, this time.
Keep posting as you have been at this for sometime already.
Phil
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