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Old 01-22-2008, 04:51 PM   #1 (permalink)
dezil
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HELP!....my turbo wont spool...

I had my sluggish 6.5 powered dually in the shoo to put a new exhaust on, and it did make a difference in power, but the mechanic said that the turbo isnt spooling up.

I admit, I dont know what that means. I assume it means that the turbo isnt producing any boost. I asked him what to do and he told me he has no idea, that he is not really a diesel guy.

Can somone help me figure this out. I had a friend that had the same problem and it was just a bad sensor. The impellor spins inside, its not jambed up or anything.
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Old 01-22-2008, 04:54 PM   #2 (permalink)
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i think this truck has a vac wastegate system. check form vacuum at the black wastegate hose. should have 15 on a gauge(don't know the measurement). also test at the orange vac line and you should have about 20 there. if not then you've got a bad vac pump. they go bad alot on these trucks.
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Old 01-22-2008, 06:52 PM   #3 (permalink)
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im kinda green when it comes to turbos, could you be more specific as to where these items are and what they look like....
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Old 01-22-2008, 08:22 PM   #4 (permalink)
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Hit the FAQ's and Reference section, and make notes of words and phrases as you run across them, if you are unsure of what's what.

Look for Waste gate actuator, waste gate solenoid, vacuum pump, vacuum lines.

Could be something silly, like a line cracked or pulled off, something basic, like a fried vac pump, or actuator, or an electrical problem with a solenoid.
Worst case is a fried turbo. You can check it to see if it is seized, by popping off the rubber hose that runs into it from the air box. Look inside with a decent light, and you should see the compressor vanes of the turbo. Use a pencil or something that will not scratch it up, and see if it will rotate freely. If it moves, it is, at least, not seized If it will not move, it is seized, and you are lookin' fer a new one. Ugh! This is a possible, but fairly low likelihood situation. Check this, engine off. All checks of vac system stuff, have to be done with the engine running.


Pictures are here Got me a new camera

You will want to ID the wastegate actuator. It's on/beside the turbo itself, and has a rod and linkage running to the little arm on the side of the turbo. When the engine is running, the arm should be pulled towards the actuator. That's forward, or up, depnding on the exact setup The one shown in the pictures above, is mounted a slight bit differently than the one on my '95, but looks pretty much the same. It will be mounted on the passenger side of the engine comp, between the air filter box, and the turbocharger.
If the arm is not pulled towards the actuator, you will have to start troubleshooting the vacuum system that operates it. A vac gauge is gonna be really handy!

Start with checking if the actuator is pulling on the linkage.

Check that there is vacuum produced at the pump. Follow the vac lines up to the solenoid, and check at the solenoid, for vacuum. connect the vac line to the output line from the solenoid to the WG actuator, and check that the actuator arm is pulling.

IIRC (I went through a lot of this a short while back) vac at the pump should be about 20-25 inches, and at the wastegate actuator, about 15. The computer runs the solenoid off and on, and continuously, to regulate the vac to the actuator, and thus controls the level of boost. The solenoid should be on the engine, above the rocker cover, ahead of the wiper motor. If your motor is equipped with an EGR, you will have three of them in a row. IIRC, the non-EGR versions have just the one solenoid.

That should get you started! Lookin' and troubleshooting, that is!

Cheers
Trev
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Have an Equus 3120 OBD1/2 scan tool, too.

And electrical issues... Always with the electrical issues!
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Old 01-22-2008, 09:56 PM   #5 (permalink)
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trev,

ok...sounds like a plan. I can tell you already that when I had the airbox hose off I was looking at the impeller and I can spin it with my finger. Also I saw that arm on the side of the turbo, and when I move it with my hand I can hear the "swoosh" kinda like a vaccum or compressed air.

I will take a look at the rest of the stuff you mentioned and get back.....
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Old 01-22-2008, 10:00 PM   #6 (permalink)
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Spooling up or down, is basically turbo slang for saying, the turbo compressor and turbine wheels are accelerating or decelerating.
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Old 01-25-2008, 11:04 AM   #7 (permalink)
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I apologize for my ignorance here guys, but Im not really understanding some of the abreviations and things we are desrcibing.

I removed the airbox boot. The turbine, or impeller....the small fan in the turbo does move, its not frozen. I looked under the hood, and I do see that mechanical arm thats attatched to the turbo. it does move with hand pressure when the engine is off. What do I check next?
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Old 01-25-2008, 11:23 AM   #8 (permalink)
trevj
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The lever should move relatively freely when the engine is off.

Start the engine, and check it again. It should pull away from the turbo, towards the actuator.

If it is not pulling towards the actuator, then there is a problem with either the vacuum system, or the electronics that controls everything.

Do you still have the "Turbo Power" cover on your engine? If so, you are going to have to remove it to follow the lines you need to check.
There should be a line attached to the actuator, that runs across the top of the engine, to the drivers side. This vaccum line is hard plastic, usually, and can be broken without too much effort, if one is careless around the engine. Identify the line, and follow it back to the solenoid. This line should have 15 inches of vacuum on a vacuum gauge. The same vacuum gauge should read 20-25 inches, when hooked into the vacuum line on the other side of the solenoid.

Got a vacuum gauge yet?

There should be a diagram of the vacuum system on a sticker on the hood or on the crossmember at the front of the engine compartment.

You are going to have to learn a fair bit, and fast, if you wish to troubleshoot this yourself.

Read and reread the sections of the FAQ's that refer to the vacuum system and vacuum pump. Identify and locate the solenoid on your truck. Follow the lines that come and go from the solenoid. One comes fom the vac pump, the other leads to the turbo and the waste gate actuator.
Some basic troubleshooting can be done without a vac gauge, but having the actual numbers will tell a lot about the state of the equipment.

Cheers
Trev
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'94 K1500 4x4, 6.5TD 351K Kms. New to me August 3rd.2007
Homebrew remote PMD. #7 resistor (it was in the old PMD) mounted in front bumper, behind the license plate mount ,EGR plugged. Mildly opened upper plenum. New front driveshaft.. .3:42 gearing.
Homebrew wastegate controller. $12 boost gauge setup. Recently installed a used transmission.
Have an Equus 3120 OBD1/2 scan tool, too.

And electrical issues... Always with the electrical issues!
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Old 01-25-2008, 11:26 AM   #9 (permalink)
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start the truck up and see if the wastegate arm moves up into the little can it comes out of. you should not be able to push the wastegate arm down with the engine running. if you can then you've got vacuum system issues. it could be a bad pump, bad solenoid, cracked vac line, etc.
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Old 01-25-2008, 11:26 AM   #10 (permalink)
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guess i type too slow?
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