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#4 Fuel Injector Spray Tip

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Old 29 Aug 2011, 05:01 pm
My02RedRide's Avatar
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Location: Rochester Hills, Michigan
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Default #4 Fuel Injector Spray Tip

Anyone have a problem with #4 injector and the end of the fuel rail have problems with varnish or general crud blocking 2 of the 4 pin holes? When I did the head gasket and so forth I pulled the rail and seen that injector gummed at the spray surface and the intake valve nearest the back of block gunked up on the back face in the intake port. I cleaned with kerosene and it resolved the rough idle to boot. Is this signs or crap in the rail? Used 2 treatments of Chevron Techron and made a difference but for how long. 107,000 miles recent purchase.
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