73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Performance => Topic started by: 1979C20 on December 06, 2010, 10:39:34 PM
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So winter rolled around and its finally getting cold. In the morning when I start up my truck, the right side of my exhaust dumps black smoke and the truck runs like its missfiring terribly. Its a 79 c20 with a 350 stock rochester qjet, headers, and true duals glasspacks. I have to rev up the engine to about 3k and hold it for like 15 seconds and it clears out and idles normal. What would cause this?
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a choke maybe. how cold is it and what do you have as far as emissions
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The choke works properly, after I get the engine to clear out, the choke keeps the idle at about 1100rpm and then when its warm, I crack the throttle and the idle drops back down to the normal 550rpm. All I have emissions wise now is the EGR. Removed emissions exhaust manifold, CAT converter, and AIR pump. Ive got headers and glasspacks now.
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i think not sure but i think a dirty egr can due that till it gets hot enough
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That sucks! Looks like its time to buy myself a EGR block off plate and just run no emissions. I forgot to mention, I pulled my vac canisters out too.
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Your idle is at 550? How you do that mine is at 900 it seams to run good there. I know if my choke is on at first its ok then it will load up and smoke and act like its missing till I give it gas to open the choke even with the choke on its only about 1100
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just look at what other people said and 550 is about norm in park but even when I had my engine in my 86 with a th350 it would seam to only like to run 900 or higher in park so it wouldn’t stall in gear makes me wonder what I got in my engine lol
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Ive got a really large cam in it, so I can set the idle lower. Its got a nice grumbly rhythm to it. Runs fine. I ran it at about 7 or 8 for a while, but it seemed really high and I was burning a lot of fuel. But it runs smooth at 550. My truck is a manual also.
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throw egr in trash.buy cover plate seal it good drive and be happy.
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where can I buy the cover plate, how much is it, and can I buy it locally or would it be from like summit or something? And, would unhooking the vacuum line from it work in the mean time?
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http://www.summitracing.com/search/Make/CHEVROLET/Engine-Size/5-7L-350/Engine-Family/Chevy-small-block-Gen-I/Year/1984/?keyword=egr+block+off+plate
But like we said before don't just buy parts and put them on. It probably wont fix it
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What do you mean, irish?
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I've always made the plates! I've got a couple of them I had on stock qjet manifolds laying around.I've got one on a cast intake and one on a aluminum factory intake.
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how do you make them? Pull the egr off, trace it on some sheet metal, cut it out and silicone it on?
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Pull the egr off, trace it on some sheet metal, cut it out and silicone it on?
Yes. Drill it before you cut it though.
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Yes! Mine were made from like 1/8in plate though lol. Let me rephrase I had them made for me lol. Sillicon them on and go.
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Okay, what thickness of sheet metal, and how would you recommend cutting it? I can beg my dad to bust out either his oxyacetylene or his plasma torch. But what if he wont?
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Got a metal cutting band saw or even a jiqsaw with a metal cutting blade woould work. Plasma cutter would prob be the fastest though lol.
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You could cut the egr off and weld the hole up. But what I was saying is this might not me your problem
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Would a portable band saw work? Its what I used to cut the pipe for my mufflers.
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Irish, I wanted to get rid of my EGR anyways, but I dont have the money to buy a new intake right now. Welding it might work, I'll have to see if my dad feels like welding tonight.
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I think I'd rather plate it than weld it with it still on the motor. That's just me though.
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Lol you have to take it off to cut it off
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The egr valve just bolts to the intake correct or is it diff on the older trucks?
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Get the gasket, cut a piece of metal to the size, drill the holes and it is eliminated. Welding on a cast intake is something I wouldn't do.