Quote:
Originally Posted by jake12tech
I sent the injectors to be rebuilt to stock pressures, new nozzles made by bosio. New heat shields, installed correctly. OEM parts all the way. Injectors torqued to spec. Any ideas why it’s nailing like a ball peen hammer on a nail? All the fuel lines plastic have been replaced. There is zero leaks in the system. Car was quieter before the nozzles.
Do the nozzles need time ti break in a few hundred miles? Car has 228k. Religious oil changes. I was going to add cetane booster and take it down the highway up to 80 and see if it helps.
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You did not say why the Injectors were rebuilt nor if they were rebuilt by someone who lapped the interior parts or kept the two parts of the new nozzles that are mated together as a set exclusive to each nozzle.
With the presumption that everything else was done correctly (it is easy to get the heat shields in upside down).
Normal stuff. Bosio's nozzles are a bit louder. Next people have reported that nailing demised in use.
They say changing the opening pressure on the injectors changes the timing a bit. Retiming the fuel injection pump may or may not help depending on what the cause is.
Did the engine sit unused for a long time? If so sticking piston rings can cause low compression which can contribute to nailing.
Air in the system can cause nailing.
Does the nailing decrease after the engine is up to the full temp?