problems after heads and cam swap
03-16-2009, 10:50 PM
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formerly charlyroxs411 (changed 11/19/2012)
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problems after heads and cam swap
Well when we turn it on the mssg board says engines reduced power. The scanner reads a misfire, hp tuners reads immature fuel so missfire, and the diagnostic said the timmking was off. I've changed sparkplugs and wires, checked the fuel pump, fuel regulator, fuel relays, fuel filter, changed the throttle body, had the pistons reringed and the block honed out. We tried different ecu's, I've swapped the heads and engine and still nothin. So I'm convinced that its an electrical problem.
Oh and I checked the coil paks, and changed the fuel injectors.
this is one my friends silverado ss we cant find the problem anywhere can some one help us out?
any help will be great
Oh and I checked the coil paks, and changed the fuel injectors.
this is one my friends silverado ss we cant find the problem anywhere can some one help us out?
any help will be great
03-16-2009, 11:33 PM
#3
Need a little more info, what mods have been done (cam, heads, tune, specs?), did the problem start after cam and head swap, or after an engine swap, or was that done to try and fix the problem. Have you narrowed down what cyl is misfiring, or is it just random multiple? Does it miss at idle, or go up to say 4k and start missing (like a plugged cat converter). There's alot of variables...
03-16-2009, 11:36 PM
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it has the stock 6.0 we re ringed it installed a cam and 5.3 heads and put it back to stock and nothing. do you know martin the one in pasadena?
03-16-2009, 11:39 PM
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well the truck was misfiring before the engine was torn apart and since the engine was gonna be out the truck(we pulled it out the truck) we did cam,heads,and valve train we put a ecu with a tune for cam and heads and nothing. let me ask him abot the idle
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03-17-2009, 12:04 AM
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Ok The problem started when the truck was stock no tune no nothin And it misses at idle at times it idles fine and we get it up up to 3k and it starts missin again The heads where swapped tryin to fix the problem they thot the valves were no good And right now it has a 4.8 it had a 6.
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