Q's about setting timing
#1
Q's about setting timing
Ok, here's my story, I bought the truck for 1800 with a bad trans, so was unable to test drive before I bought recently found trans and installed, took it to get emissions done so i can get plates... Failed and not by a little bit, opacity limit ( whatever that means ) is 20 and at wot it blew 50.3, i'be seen your posts on what causes black smoke, praying its not pump, talked local shop into letting me use their scanner and found my timing at .60 where you guys say -1.94 is ideal, would that much off cause it to blow that dirty?
Turbo spins freely, waste gate wired open, new air filter
Truck feels sluggish too, I'd bet my s10 would out run it
Any help appreciated
Turbo spins freely, waste gate wired open, new air filter
Truck feels sluggish too, I'd bet my s10 would out run it
Any help appreciated
#2
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i wouldnt really trust the snapon scanners for these trucks. the one at school says i have a -2.20 tdco offset. well according to the gm manuals that is very out of spec and it would have thrown a code. well my ip was recently done by the gm dealer so i doubt its that far out of spec and i have no codes. this also happened to another guy on another site so i doubt their accuracy.
your vaccum pump sounds like its shot. you should have a puff of black smoke at first when you take off but it should clear up after that.
your vaccum pump sounds like its shot. you should have a puff of black smoke at first when you take off but it should clear up after that.
#7
a tech 2 or autoenginuity or carcode will give you the correct tdco offset and will allow you to change it. in the first post you said it was wired open so which is it? if it is infact wired shut it could be that your timing is way out of wack or you have pissing injectors. thats another thing i would check is the injectors to make sure they are the correct pop pressure and atomizing correctly because if not they can cause smoke too. make sure nothing is clogging the intake manifold too.
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