86 smokes
Thread Starter
4th Gear
Joined: Feb 2014
Posts: 4
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86 smokes
I have an 86 coupe, auto with aluminum heads. I bought the car for a song and dance $3k. It has z51 package, aluminum heads' 307rear end and and just about every performance option that was available. I like it. I had a 77 for 20 years. It smokes blue after idles and is warmed up. Doesn't really smoke when it first starts up which would indicate valve seals. Doesn't smoke on acceleration which would indicate rings. I read past forums on transmission modulator, clogged valve cover drains. Help
Le Mans Master
Joined: Oct 2004
Posts: 6,314
Likes: 508
From: South-central Missouri
Well, not enough info to put a finger on it. It might be as simple as seals, or a general overhaul...hard to tell from what we know.
Just a cursory inspection would be to inspect the sparkplugs - see if there is one or few holes that are especially oily.
A compression check or (better) leak-down check will focus on problem holes.
Manifold vacuum at idle
PVC valve
...and get back 2 US!
Just a cursory inspection would be to inspect the sparkplugs - see if there is one or few holes that are especially oily.
A compression check or (better) leak-down check will focus on problem holes.
Manifold vacuum at idle
PVC valve
...and get back 2 US!
Team Owner
Joined: Sep 2003
Posts: 20,179
Likes: 673
From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
He's given plenty of info to diagnose valve seals.
Hang around here long enough its not that difficult.
Plus, if you follow the 86's you'll see that after 100K and 25 years this problem is text book.
Hang around here long enough its not that difficult.
Plus, if you follow the 86's you'll see that after 100K and 25 years this problem is text book.
Melting Slicks
Joined: Apr 2011
Posts: 3,496
Likes: 475
From: New Jersey
I ran Mobil 1 in my '86 for a year. I get the puff at startup of a warm engine. I have now gone back to a Dino oil (one with higher ZDDP for my cam) and am curios to see if the puff decreases. I know that my valve cover gasket did not weep until I did the synthetic.
Safety Car
Joined: Oct 2007
Posts: 4,426
Likes: 229
From: Pennsylvania
Thread Starter
4th Gear
Joined: Feb 2014
Posts: 4
Likes: 0
[QUOTE=Paul Workman;1586192419]Well, not enough info to put a finger on it. It might be as simple as seals, or a general overhaul...hard to tell from what we know.
Just a cursory inspection would be to inspect the sparkplugs - see if there is one or few holes that are especially oily.
A compression check or (better) leak-down check will focus on problem holes.
Manifold vacuum at idle
PVC valve
...and get back 2 US
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Thread Starter
4th Gear
Joined: Feb 2014
Posts: 4
Likes: 0
Plugs look ok no oil on them. Motor doesn't miss and idles and runs good. Cats were removed..not by me. Guy i bought it from said ERG was bad and had thrown a code. It just loads up at idle when warmed up.
Team Owner
Joined: Sep 2003
Posts: 20,179
Likes: 673
From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
You can set them after completing each cylinder.
Make sure the piston is at TDC.
Run the rocker down to zero lash and add a 1/2 to 3/4 turn.
Move on to the next cylinder in line....
Make sure the piston is at TDC.
Run the rocker down to zero lash and add a 1/2 to 3/4 turn.
Move on to the next cylinder in line....