Quote:
Originally Posted by pawoSD
If your exhaust is not constantly black/gray all the time then you can be assured its probably not injectors or timing chain stretch. Leaks can often go undetected aside from low mpgs....do a thorough check.
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I have searched the forums and this is the best statement about how you know when to replace your nozzles or the impact of timing chain stretch I have seen.
What are the symptoms of overdue nozzles, timing chain stretch, and IP timing?
Unburnt fuel in each case?
In my case, I have checked the odo, and replaced all the fuel lines with the exception of the ones under the car (they are completely dry and had been replaced by the PO) and the fuel return lines. These don't look bad, but they are the old braided style, so they could be original. Still, they aren't spraying fuel at any rpm, so it is hard for me to believe that I could lose 8-9 mpg from these lines even in the event that they are weeping (though I don't see it).