Ok here's my problem i have an 84 k-20 with a unknown 6.2l diesel it starts everytime but seams to run rough and smokes <white/blue>.There's a heavy diesel odor that actualy burns my eyes any help would be greatly appreciated:) i have heard that bad injectors can cause this problem but after reading some of the post i am not sure thats my problem? thanx in advance Chuck

Lots of possibilities, most likely is the injection pump's advance mechanism has failed and your advance device is no longer functioning properly. Before you change the pump, change fuel filter and check supply pressure first.

THANX TDG OK HERES THE DEAL I PUT A USED IP ON IT ABOUT 3 MONTS AGO AND HAVENT DRIVEN IT SINCE TRYING TO GET IT BAC ON THE ROAD BUT THE SMOKE BOTHERS ME IT HAS A BRAND NEW FUEL FILTER ON IT WHEN I DID THE PUMP I FIRED IT UP TODAY TO CHECK THE COLOR OF THE SMOKE AND IT IS MORE BLUE THAN WHITE NOT SURE ON THE ADVANCE ? COULD YOU MABY GIVE ME A LITTLE MORE INFO ON THAT ? AND THANX AGAIN CHUCK:help2:

Lotta Looking Sure Wish I Could Get More Replys I Realy Wanna Get This Truck Back On The Road But I Don't Wanna Get Stuck Or Worse Wreck The 6.2

My '82 smokes out the right tailpipe. Think it's because of a bad seal on an exaust valve. Might have a burned inatke valve too. This is probably a different problem than yours.

Its all in the title of this thread, blue/whitish smoke and diesel smell. Theres raw fuel coming out of the tail pipe. If its severe, you probably need a pump, if its minor, you might just need to advance the pump a little, if you have rough idle as well, you may need injectors too, but its definitely a pump/injectors issue.

ok so to addvance i go to the drivers side right? and it dose have a nasty shake to it was thinking maby bad injectors? and i'd like to say thanx again for all the help you guys are the best:)
and btw i did tell one of the diesel techs at the local chevy dealer bout the site today too

drivers side to advance, correct...
I think your going to find you need a pump AND a set of injectors AND maybe more (supply pump, timing chain, etc.) to get her running right.

I have to agree on a bad injection pump. Try the timing advance first. Locate a long lever (4") on passenger side of injector pump, with engine running at idle, depress this lever, (engine should stumble) watch advance piston on bottom of lever to see if it returns after being depressed. Other issues could be bad internal parts of injector pump. I doubt any problems with injectors.

Well i'll have to check that out if it's a bad pump i guess it'll have to wait till i get some capital to get a new pump:( I guess i'll just hope it's just a timing issue guess i'll find out when i check it

thank's again everyone
CHUCK

Prices on those old 6.2 pumps are getting pretty low, there's not that many of them still around.

kool tdg any idea on where in michigan to look?
thanx Chuck

Toronto area close enough ;)