I have a 95 6.5L diesel that is shooting out a lot of black smoke when you kick it down and does not go 75, would this be a injector problem, if so how would you diagnoise which ones it is and if not what are some other ideas

thanks
John

don't have alot of experience with the 6.5's, but i know they are notorious for pump problems. this is not the best news for anyone, but i hope others can help more with the diagnostics. you could always take it to a shop/chevy dealer and pay them the diag fee, and go from there. Either way, the black smoke is a sure sign of "over fueling"....either the pump is pushing too much, or the injectors are leaking...or regulator(i think it is internal on the pump) is blown.

Is this truck a turbo?

If so this will most likely have NOTHING to do with the IP or injectors....

DON"T LISTEN TO PEOPLE WHO START OFF BY SAYING THEY DON"T KNOW ANYTHING AND THEN START RATTLING OFF ABOUT HOW BAD THE IPs ARE!!!!!!

Scan your computer with a paperclip and see if you are getting a code 78....if so, check all of the vaccuum lines coming from the vaccuum pump up to the wastegate solenoid and from the solenoid to the actuator....

You will need to test for 15 inches of vaccuum on the line coming off of the solenoid....

My old Dodge Cummins use to put out a lot of black smoke but man it went way over 75!

Black smoke is wasted power......not a good thing......people who know what they are doing with a diesel are looking for as much hp and torque as possible with the smallest amount of smoke....

290k nothing but oil changes, filters and a water pump.

buy a well maintained cummins or 7.3 powerstroke. Or in other words.....................get a REAL diesel!! have 350k on my 97 7.3 and still hasnt skipped a beat. My old man made the mistake of buying a new duramax and got rid of it 2 months later cause he finally realized it was a chevy diesel? hahahahaha ABSOLUTELY LOVE CLASSIC CHEVYS THOUGH, HAVE A 77 K10 4X4 W/BB454 AND TH400. HAD A 68 Z-28 W/BB427 BUT GOT INTO TOO MUCH TROUBLE, BURNOUTS IN WALLYWORLD PARKING LOT= BAD IDEA

Now THAT'S the voice of maturity.

(sarcastic grin)

Back to the original question, my limited experience with diesels suggest possibly a leaky injector.

well, since you wanna get real technical, it is an Isuzu engine....and if anyone wants to buy a used chevy diesel....i would reccomend a 6.6 over the 6.5, and make sure it is an engine code 2.....not a 1

If you are going to get techincal.....do it right!

The 6.2 and 6.5 were designed for GM by Detroit Diesel (owned by GM at the time)...

The 6.6 was designed by a company known as DMAX which is a partnership between GM and ISUZU.....

FWIW - the injectors are not the problem...

This is what my old man was doing when he bought a chevy diesel :-)
then he bought an f-350 king ranch and he was :-)

Do you have a lightweigt version? Try to blend the EGR valve on the intake manifold. This often help, it is often caused by faulty Vacum valve or leaking EGR seals. Blend at valve in port to prevent engine light to come on. Best Regards Eyvind

Not getting enough oxygen. Check air filter, intake hoses from turbo to intake manifold. Check boost pressure. Listen for turbo spool up on acceleration.

Listen up weiner.. I know a thing or two about Diesels and I say that 6.5's have a problem with Injector Pumps.. I do at least 10 of them a year every year since the 6.5s started to come off warrenty. In fact.. I do more injector pumps than I do brake jobs on sunfires. And I do them because they wear out and overfuel the engine causing a severe black smoke condition...

Hahaha....you have no idea what you are talking about do you???