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Old 11-19-2012, 10:21 AM   #1 (permalink)
Wik837
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Newbie with black smoke

I have a 97, I changed the lower intake gaskets last night I found that the old gaskets had a metal blocker over the egr port. Now since I changed them I'm getting a ton of black smoke at 3/4 or more throttle that won't go away, any ideas?
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Old 11-19-2012, 10:59 AM   #2 (permalink)
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The most common reason for Black smoke is low boost. Doublecheck everything that you disturbed while doing the job, including vacuum lines, and anything pre-and post turbo that you may have disturbed.

If your vacuum system is still all original, the factory lines are notorious for becoming brittle and cracking, especially after they are disturbed by the sort of work that you performed. If you cracked a line or something is loose, the wastegate could be unable to properly close, which would result in low boost, which would explain the smoke.
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Old 11-19-2012, 12:05 PM   #3 (permalink)
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Ok I'll check it out Ty for the help
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Old 11-19-2012, 12:32 PM   #4 (permalink)
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Well checked everything and it looks good the only thing I see that maybe suspect is if I put the waste gate all the way up it will snap back down half way and slowly lower the rest of the way down, is this normal?
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Old 11-19-2012, 12:59 PM   #5 (permalink)
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With the truck shut off it should be loose and gravitate towards where gravity takes it.

When the truck is running at idle the wastegate should be pulled firmly closed - if you have someone start the truck while you watch it ensure that it does this. Once it's been running for a few seconds you should NOT be able to push the wastegate open by hand while the truck idles - if you can, something, somewhere, is wrong.
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Old 11-19-2012, 01:17 PM   #6 (permalink)
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Quote:
Originally Posted by Wik837 View Post
I have a 97, I changed the lower intake gaskets last night I found that the old gaskets had a metal blocker over the egr port. Now since I changed them I'm getting a ton of black smoke at 3/4 or more throttle that won't go away, any ideas?
No truck info in your sig makes it hard to diagnose. Do you have a VIN S (EGR) or VIN F (no EGR) engine? If you replaced the lower intake gaskets for a VIN F with the gaskets for a VIN S... that's the problem. ~FH
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Old 11-19-2012, 02:20 PM   #7 (permalink)
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It's an s (vin) I believe it had f( vin) on them before I changed them. Can not move the wastegate after the truck is running. I'm gonna check to make sure it moves when the truck is started. Ty every one for the help and I will get the sig updated
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Old 11-19-2012, 02:59 PM   #8 (permalink)
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Quote:
Originally Posted by Wik837 View Post
It's an s (vin) I believe it had f( vin) on them before I changed them. Can not move the wastegate after the truck is running. I'm gonna check to make sure it moves when the truck is started. Ty every one for the help and I will get the sig updated
The wastegate is NOT supposed to move with the truck running. The vacuum pump and WG solenoid is holding it closed like it should. The smoking problem is most likely a non-working EGR system. The previous owner apparently blocked off the manifold returns on purpose to eliminate it. Unless you put F VIN gaskets back on you'll have to restore the EGR system to operation or remove the EGR valve and block off the EGR port in the upper intake. ~FH
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Last edited by FloridaHorseman; 11-19-2012 at 03:01 PM.
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Old 11-19-2012, 04:41 PM   #9 (permalink)
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If it has an egr port, then it is an s vin.

If you remove the blocker, you have to add the egr equipment back in there which I suspect was removed when they block it which is 2 EGR solenoid and a vacuum line. Otherwise, you will have black smoke. So, you may want to block them again and see if the smoke goes away.
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Old 11-19-2012, 04:54 PM   #10 (permalink)
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So just wondering why would you want to unblock the EGR if its already blocked? I believe blocking it increases fuel mileage? correct me if im wrong.
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