6.5TD black smoke and slow acceleration... help...
 

hey guys, last night i decided to change my valcover gaskets so i did . and reassembles the upper intake with new gaskets. this morning i took is out and i was accelerating really slow with alot of black smoke untill it reached a good rpm like 2500-3500 then it had like amazing power.. can this be a waiste gate issue. i went through all my vac lines and can figure it out....:/ i have a video bellow show the waiste gate actuator mouving when i rev it. i tried unplugging the waiste gate and seeing how much suction there was to see if the vAC PUMP was working and its like i can just to say feel the suction. let me know if its normal....


seems slow to me... let me know please! thanks:c:

---AutoMerged DoublePost---

Just checked vaccum at waiste gate ... Getting 0 inhg... Tested it at vacuum
Line at silonoids and getting 2 inhg ..., bad vacuum pump?

could be, did you kink any fuel lines replacing it?

Nope lines werent bent at one spot. Its was a gradually bend, showing that i have no inhg coming from the vaccum can be causeing black smoke ... Im pree sure anyways lol

do you have boost? you could have a leak in the intake or turbo lines..

See at the beginning where you can move the wastegate arm by hand?

The gate is supposed to be hard shut at idle and there's no way you can move it by hand on a properly working system. The gate is mmoving when you rev the engine because the exhaust is pushing it open and bypassing the turbine.

So, you have "0" boost at all times.

With no boost, the truck will smoke like a battleship smokescreen as it is overfueling. You EGT's are also going to be through the roof as you end up with fuel still burning as it is pushed out on the exhaust stroke into the turbo exducer and exhaust

There are couple things that could be the issue:

1. Boost actuator solenoid
2. Vacuum pump
3. Wastegate vacuum pot
4. vacuum lines.

So assuming it worked before you took it apart and now not, it's probably something you removed/installed while doing the valve covers. With that in mind, here's my guesses:

You hooked the vacuum lines up backwards at the vacuum solenoid that's located above the drivers side valve cover on the bracket (see the connection to your valve cover job?). Especially easy to do if they're not the factory lines with the factory push on vacuum fitting (ie: lines have been replaced and they're not the orange and black plastic ones that GM originally installed)

Next guess would be the vacuum pump is on it's way out. A healthy pump pulls around 15-20 in/hg. According to your post, you're pulling 2 in/hg (ain't cheap, expect at least 100-150 bucks).

Last guess would be the vacuum solenoid has gone "tits up". This is the component located above the drivers side valve cover that the vacuum lines go to. This component is very prone to failure. There's a little check ball in it the the solenoid uses to control vacuum to the wastegate. they are prone to rusting and sticking or not sealing. Expect around 50 bucks.

Check that your vacuum lines are connected to the solenoid first. It's costs you nothing to check.

The other option to all this is to head on over to Heath Diesel and order up a 'turbo master". It takes the place of the entire vacuum system and makes the wastegate a mechanical system. You can remove the vacuum pot, the vacuum solenoid and the vacuum pump all together. Then the turbo works or it doesn't. No worrying about the vacuum system ever again....

Good luck.

Thanks for the amazing reply..:) i picked my self up a real vacuum gauge and tested right at the pump an its only pushing out 2inhg, im assuming the pumped failed at bad timming during my valve cover job. I went to buy a new pump and tried to turn the shaft on the new pump and couldnt . The old pump i was able to do it easily, soo im 99.9% the pump let go on me ..:p and as for replacingthe system with a mechanical waste gate... I cant , my truck is vin s and has egr.. I will be getting a mechanical waiste gate after the new pump is intalled so it can run egr . I know i can change the intake and pcm to remove egr but that money i doonot have atm:p will let u know how it all turn out tonighf when i change the pump , again thanks for the help:):jump:

True enough, an "s" will code without the egr unless reflashed.

I'd load up a standard "F" program for ya (I've got the software/hardware to flash OBDII 6.5's) but I rather doubt you're on the island of Newfoundland......

No im located in ontario canada haha

Close, but no ceegar.....:tttt:

Still, closer than most. Most guys are south of 49....

What is ur location..? And with ur flasher can u reflash a program into it ?

Newfoundland. Not the part that's connected.

I've got tunercat II software/hardware and the vdf that lets me read and flash OBDII PCM's in the 6.5 trucks.

Bought it to "tune" my 98 K2500.

No, it wasn't cheap......

How much doe that cost . I know buying a pretunned pcm is roughly 500$ ..

Just over 1100 bucks.

Then you have to figure out how to use it.

That's the real problem.

When you pay for a "tune", you're not really paying for the "tuner" to re-flash it (well, his cost in equipment is part of that) you're paying for their expertise with altering the program.

For example, do you understand any of this:

http://i40.photobucket.com/albums/e2.../fuelboost.jpg

http://i40.photobucket.com/albums/e2...Untitled-2.jpg

Those are some of the simpler tables. It gets much more complex.

Get it right and better running and more power can be found.

Get it wrong and a 7,000 dollar engine and 2000 dollar transmission turns into 100 dollars of scrap iron/alumium......

Holly eh , never knew that complex.. And if u know how to tune a 6.5 how much would u charge me if i sent my pcm out to u and put a tune similar to a kojo or heath or ssdeisel tune on it?

Sorry, I'm only personal use.

I don't sell my programs.

If you send me a spare (16216588), I'll flash it with a stock 98 L65 program if you want (no charge).

No guarantees it'll work (that's why I say send a spare), you pay shipping both ways.

I'll also need your vin.

I can do a couple things for you like extended torque convertor lock up and extended glow times.

One more thing; turn around time can be a couple weeks or a couple months. Free service so I get to it when I get to it.

Reply to this email if you want to give it a go:

65dieselprogrammer@gmail.com

Pretty sure I'm not breaking any forum rules as it's "no charge" service.......:humm:

Installed new vaccuum pump an now i have full vacuum presuure back but it smokes like 10 and i need my truck fixed , it my dd... Anyother options... Waiste gate is nice and strong again but still smokes:/

Can you be a little more descriptive than just "smoking"? IE: color, amount, rpm, hot, cold, etc....

First, is the wastegate closed and operating properly?

Next, pull the codes from the PCM and see what you've got.

After that you're down to:

air filter clogged

boost leak - intake gaskets, etc...

Injectors - how many miles on 'em?

Some other fueling problem


Pull the codes and go through it all very closely first. Don't start throwing parts at it hoping it will fix it.

Once again, if it worked fine before you pulled the valve covers and now it doesn't, your problem is 90% sure to be something that you removed/installed....

New update . Now i have no pressure at the waiste gate. At the solenoid i have full presure but after the solenoid i dont... Voltage is nice and strong at solenoid. Can the solenoid be finished and codes were p1656 and nother one but i foget .. Had to do with intake

P1656 - wastegate solenoid control circuit (turbo models only)

First guess: vacuum lines are backwards at solenoid.

Second guess: solenoid not working.

Betting on lines being backwards if it worked before valve cover job and not now....

Double check the vacuum pot on the turbo by routing vacuum directly from the vac pump to the turbo pot. No more smoke means problem is in the solenoid. Be careful driving it though, the wastegate will be held shut and the turbo can build up to 25 lbs of boost without regulation. This is enough to pop a head gasket. Best done only if you have a boost gauge to keep an eye on the boost and limit it with throttle to no more than 13-ish psi.

K found that my sensor on my upper intake wasent plugedd in now it give presuure at the waiste gate soo solenoid is good. Still smoking tho with presuure and all .. Im honestly clue less from here now ....

I'm back to post #17 then....:s:

Tell me about it .. Im gonna rip apart the upper intake and check wires

Make sure your egr is hooked up correctly or the engine will unseat the egr under boost and dump boost causing black smoke.

Also make sure your gaskets are in good shape (IE: not torn or missing pieces) or you can have a boost leak.

Also make sure you have the gasket installed between the upper and lower manifold for the egr or it will dump boost down the egr port.

Open this:

http://www.google.ca/url?sa=t&rct=j&...pwN9_w&cad=rja

Look on page 6a-279 and you can see it in the first picture.

Another:

http://myweb.cableone.net/tbogemirep...20EGR%20intake

The silver bit in the middle is the ring...

Well i did so and no luck ... Here a quick video what it does with the new vacuum pump on ..
---AutoMerged DoublePost---

ouu... might need to take it appart again then the middle o ring that goes to egr outlet i dont recall seeing that what so ever.... maybe i need a new one?

Could be. Black smoke on stock fueling indicates an lack of boost. If your wastegate is operating properly then your boost is going somewhere.

If the egr gasket is crushed or missing, you can see where part of your boost is going.....right into the exhaust ports.

Seeing how that is something else you had disturbed to do the valve cover gaskets, it seems a likely suspect....


Sent from my iPhone using Tapatalk

can be.. ill check it out tomarrow morning ,ill keep u posted for sure(Y) this truck gave me to much stress. lol i try to make it good buy fixing its leaky valve covers but the it stabs me in the back hahah. but yea ill rip it apart one more time. is there anything else i should know while im in there.?:P thanks again great white. im happy your actually tryng to help me figuer it out :) props to you man :):c:

---AutoMerged DoublePost---

video part one :


video part two :


Video part 3 !:) :



:jump::rocking::c:

thanks alot me for helpimng me out dignost the problem:) i was ready to scrap it:P

No prob.

Glad you fixed it.

:c: