Need help diagnosing smoke - Team Camaro Tech
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post #1 of 10 (permalink) Old Jun 24th, 14, 05:02 PM Thread Starter
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James
 
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Need help diagnosing smoke

Installed a Holley Street Avenger 670 a few months ago, and with the help of the forum, got it setup and working pretty well. Thanks for that.

I'm back to ask for some help diagnosing some smoke I'm seeing out the exhaust. At idle I don't see anything, but when the engine is warmed up and I'm accelerating, I get some healthy smoke out the back. When I'm cruising on the highway it's a fairly constant sight as well. It can't be classified as black or white; it's gray. Engine runs great; good power. But the smoke trail is getting old and I'm not sure where to start.

I've got an Edelbrock 1721 fuel pump that isn't supposed to require a regulator, but it's really the only thing I've installed other than the carb since reinstalling the engine a few months ago. I've checked the floats on the carb and those are perfect.

Any help or tips on what to look for are much appreciated.

--
James
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post #2 of 10 (permalink) Old Jun 24th, 14, 05:18 PM
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Re: Need help diagnosing smoke

Generally smoke under load indicates ring wear but possibly could be small amount of coolant getting into cyl. Either way, a compression test will tell you more. Good luck
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post #3 of 10 (permalink) Old Jun 24th, 14, 06:07 PM
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Re: Need help diagnosing smoke

Yep, and when you're pulling the plugs, be prepared for a big AH HA.

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post #4 of 10 (permalink) Old Jun 24th, 14, 06:20 PM
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Re: Need help diagnosing smoke

Black smoke is oil, and white smoke is water. Is your car getting hot?
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post #5 of 10 (permalink) Old Jun 24th, 14, 06:25 PM
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Re: Need help diagnosing smoke

Quote:
Originally Posted by Fred Ficarra View Post
Yep, and when you're pulling the plugs, be prepared for a big AH HA.
Nothing like making a guy feel like sh!t.

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post #6 of 10 (permalink) Old Jun 24th, 14, 06:35 PM Thread Starter
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Re: Need help diagnosing smoke



Plugs look good and have less than 200 miles on them. In fact, everything was great until I pulled the motor out to replace the oil pan gasket and throwout bearing. When I reinstalled, I had a new carb and new fuel pump. Since then, I can't seem to figure out what's causing the smoke. Coolant is good, oil smells and looks right.

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post #7 of 10 (permalink) Old Jun 24th, 14, 06:48 PM
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Re: Need help diagnosing smoke

Black smoke is rich (fuel) - Blue smoke is oil - white smoke is water (condensation)

My guess is; grey as described is closest to blue and is oil...

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post #8 of 10 (permalink) Old Jun 24th, 14, 07:26 PM
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Re: Need help diagnosing smoke

If it was oil then the plugs would look like this. Why did you replace the carb and pump?


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post #9 of 10 (permalink) Old Jun 24th, 14, 08:18 PM Thread Starter
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Re: Need help diagnosing smoke

I was gifted the Holley and had the pump, new in box, from a prior project. Since I had the engine out I figured it was time to finally put it on.

Twist to the story... Took the car out tonight and noticed that when I came to a stop, the smoke appeared to be emanating from under the car and not really the exhaust. Took a look in the bay and noticed a glistening on the power steering pump. Checked the level and it wasn't on the stick. Now I know I filled that up and it hasn't been cranky (yet), but I'm wondering if I'm not leaking power steering fluid on the headers and it's burning off? Thoughts?

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post #10 of 10 (permalink) Old Jun 24th, 14, 09:22 PM
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Re: Need help diagnosing smoke

Quote:
Originally Posted by busterswt View Post
I was gifted the Holley and had the pump, new in box, from a prior project. Since I had the engine out I figured it was time to finally put it on.

Twist to the story... Took the car out tonight and noticed that when I came to a stop, the smoke appeared to be emanating from under the car and not really the exhaust. Took a look in the bay and noticed a glistening on the power steering pump. Checked the level and it wasn't on the stick. Now I know I filled that up and it hasn't been cranky (yet), but I'm wondering if I'm not leaking power steering fluid on the headers and it's burning off? Thoughts?
Fix the ps leak. Clean off all residual and reevaluate the situation.

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