Smoke from one side of exhaust - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mrdsmoke420 · 07-03-2013, 08:48 AM

I have true dual exhaust on this 1987 chevrolet truck. The drivers side tailpipe smokes. Any ideas on how i would stop it? If you give me an answer like 'check this' could you also explain on how to 'check' what. You are talking about. Thanks! Any info is greatly appreciated!
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JMac11 · 07-03-2013, 09:19 AM

Could Be:

Bad valve stem seals on that bank
Broke ring on that bank
Clogged oil return on that bank

I would not worry until it fouls a plug or consumes more than one quart every 3000 miles.

SCOTI · 07-03-2013, 10:18 AM

Quote:

Originally Posted by Mrdsmoke420

I have true dual exhaust on this 1987 chevrolet truck. The drivers side tailpipe smokes. Any ideas on how i would stop it? If you give me an answer like 'check this' could you also explain on how to 'check' what. You are talking about. Thanks! Any info is greatly appreciated!
Posted via Mobile Device

What color is the smoke? White or black?

Mrdsmoke420 · 07-03-2013, 10:26 AM

The smoke is white. It is not the thickest smoke, but after a little drive around the block it gets thicker
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SCOTI · 07-03-2013, 11:05 AM

Quote:

Originally Posted by Mrdsmoke420

The smoke is white. It is not the thickest smoke, but after a little drive around the block it gets thicker
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'White' smoke from one exhaust bank typically means moisture in the combustion chamber which means failed head gasket or leaking intake gasket @ one of the cooling ports.

JMac11 · 07-03-2013, 11:28 AM

Turbo 350??? Could be sucking trans fluid through modultor valve also....

SCOTI · 07-03-2013, 11:35 AM

Quote:

Originally Posted by JMac11

Turbo 350??? Could be sucking trans fluid through modultor valve also....

Ahh... Very true as well.

88Jimmy4x4 · 07-03-2013, 12:36 PM

blown head gasket or cracked head my guess, especially being on drivers side....pull #1 cyl spark plug and take a look at it

Rufton · 07-03-2013, 01:27 PM

I'd start by labeling plug wire addresses.
Then pull plugs 1,3,5 and 7; label each plug address w/ sharpie.
A a pic of the plug's business ends would be nice.
Variance of color and deposits may produce suspects.

**Corts60** · 07-03-2013, 03:28 PM

Compression test. That will help narrow it down if the plugs aren't obvious.
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TheBlueBomber · 07-03-2013, 04:01 PM

Quote:

Originally Posted by JMac11

Turbo 350??? Could be sucking trans fluid through modultor valve also....

The duwhatahicky?? I'm having the same problem and the transfluid is black. I dont mean to hijack OP.

SCOTI · 07-03-2013, 04:21 PM

Quote:

Originally Posted by TheBlueBomber

The duwhatahicky?? I'm having the same problem and the transfluid is black. I dont mean to hijack OP.

The modulator on the side of the trans can go bad & allows trans fluid to get pulled up into the motor under certain loads causing one heck of a smoke show. Usually when it occurs, the trans doesn't shift 'right' either.

TheBlueBomber · 07-04-2013, 01:45 AM

Quote:

Originally Posted by SCOTI

The modulator on the side of the trans can go bad & allows trans fluid to get pulled up into the motor under certain loads causing one heck of a smoke show. Usually when it occurs, the trans doesn't shift 'right' either.

Like slams into gear when you put it in drive, or shifts hard where it puts you back in your seat "right"?
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SCOTI · 07-04-2013, 10:05 AM

Quote:

Originally Posted by TheBlueBomber

Like slams into gear when you put it in drive, or shifts hard where it puts you back in your seat "right"?
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Yes. It also may not want to shift @ all (requiring you to shift through each gear manually) similar to when the vacuum line is removed from the modulator.

TheBlueBomber · 07-04-2013, 09:09 PM

Quote:

Originally Posted by SCOTI

Yes. It also may not want to shift @ all (requiring you to shift through each gear manually) similar to when the vacuum line is removed from the modulator.

Interesting...
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Axle · 07-05-2013, 12:23 PM

Re potential bad head gasket, if you look in your radiator, do you see any whisps of black/brown/rusty fluid? If you do (and have had solid green in the past) you probably have a head gasket that is starting to fail. Took two years before mine finally let go, but I finally had an answer to where that rusty colored stuff was coming from.

Alex.

Mrdsmoke420 · 07-13-2013, 04:53 AM

pulled spark plug 1. ran a compression test. 0. nothing. the gauge wont even move. but what is weird is i ran a vacuum tester on the spark plug 1 and it showed compression through that, but after getting ahold of a compression tester it shows nothing. what does that mean? 3 and 5 are at 100.5 or so.. what does this mean? havent got too the others yet. taking a break. will check all and update the thread. thanks for the help!

Rufton · 07-13-2013, 08:36 AM

You could apply compressed air to #1 and see if air escapes through ex pipe (stuck ex valve), dip stick tube (possible ring/piston failure), etc for clue.

Mrdsmoke420 · 07-13-2013, 04:39 PM

Ok i will try that. Any others that had this happen?
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Mrdsmoke420 · 07-13-2013, 04:41 PM

The driver side is
1- 0
3- 100.5
5-100.5
7- 115
Passenger..
2-0
4-125
6-130
8-145
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Mrdsmoke420 · 07-16-2013, 07:41 PM

nobody has an answer to this?

Rufton · 07-16-2013, 08:20 PM

Did you pull vc to see if valves stuck open?

Mrdsmoke420 · 07-16-2013, 08:32 PM

What do you mean by vc. I have not tried to see if a valve was stuck, no. How would i do this
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SCOTI · 07-17-2013, 08:12 AM

Quote:

Originally Posted by Mrdsmoke420

What do you mean by vc. I have not tried to see if a valve was stuck, no. How would i do this
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vc = valve cover.

Rufton · 07-17-2013, 11:28 AM

Quote:

Originally Posted by Mrdsmoke420

What do you mean by vc. I have not tried to see if a valve was stuck, no. How would i do this
Posted via Mobile Device

Compare #1 and #2 valve travel vs other valves. Check valve adjustment.
I've seen severely worn rings/cylinder produce 60 psi compression.
Haven't had the pleasure to see compression for broken rings/pistons.
With 0 psi compression the culprit should be easy to find.

07-03-2013, 10:26 AM	#4
Mrdsmoke420 Registered User Join Date: May 2013 Location: USA Posts: 33	Re: Smoke from one side of exhaust The smoke is white. It is not the thickest smoke, but after a little drive around the block it gets thicker Posted via Mobile Device

07-03-2013, 11:28 AM	#6
JMac11 Registered User Join Date: May 2005 Location: Tallahassee Fl Posts: 773	Re: Smoke from one side of exhaust Turbo 350??? Could be sucking trans fluid through modultor valve also....

07-03-2013, 12:36 PM	#8
88Jimmy4x4 Registered User Join Date: Oct 2003 Location: houston, texas Posts: 1,974	Re: Smoke from one side of exhaust blown head gasket or cracked head my guess, especially being on drivers side....pull #1 cyl spark plug and take a look at it __________________ 2008 Silverado Z71 RCSB 1991 GMC Jimmy 4x4 1976 GMC Sierra C15 SWB

07-03-2013, 01:27 PM	#9
Rufton Registered User Join Date: Apr 2013 Location: Knoxville TN Posts: 1,170	Re: Smoke from one side of exhaust I'd start by labeling plug wire addresses. Then pull plugs 1,3,5 and 7; label each plug address w/ sharpie. A a pic of the plug's business ends would be nice. Variance of color and deposits may produce suspects.

07-03-2013, 03:28 PM	#10
Corts60 Just here to tinker Join Date: Jun 2008 Location: Holland, MI Posts: 3,697	Re: Smoke from one side of exhaust Compression test. That will help narrow it down if the plugs aren't obvious. Posted via Mobile Device __________________ 78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/showthread.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 73 Chevy C20(Daily)http://67-72chevytrucks.com/vboard/s...d.php?t=852767 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(sold)

07-03-2013, 08:48 AM	#1
Mrdsmoke420 Registered User Join Date: May 2013 Location: USA Posts: 33	Smoke from one side of exhaust I have true dual exhaust on this 1987 chevrolet truck. The drivers side tailpipe smokes. Any ideas on how i would stop it? If you give me an answer like 'check this' could you also explain on how to 'check' what. You are talking about. Thanks! Any info is greatly appreciated! Posted via Mobile Device

07-03-2013, 09:19 AM	#2
JMac11 Registered User Join Date: May 2005 Location: Tallahassee Fl Posts: 773	Re: Smoke from one side of exhaust Could Be: Bad valve stem seals on that bank Broke ring on that bank Clogged oil return on that bank I would not worry until it fouls a plug or consumes more than one quart every 3000 miles.

07-05-2013, 12:23 PM	#16
Axle Registered User Join Date: Jul 2011 Location: SW Ontario Posts: 1,212	Re: Smoke from one side of exhaust Re potential bad head gasket, if you look in your radiator, do you see any whisps of black/brown/rusty fluid? If you do (and have had solid green in the past) you probably have a head gasket that is starting to fail. Took two years before mine finally let go, but I finally had an answer to where that rusty colored stuff was coming from. Alex.

07-13-2013, 04:53 AM	#17
Mrdsmoke420 Registered User Join Date: May 2013 Location: USA Posts: 33	Re: Smoke from one side of exhaust pulled spark plug 1. ran a compression test. 0. nothing. the gauge wont even move. but what is weird is i ran a vacuum tester on the spark plug 1 and it showed compression through that, but after getting ahold of a compression tester it shows nothing. what does that mean? 3 and 5 are at 100.5 or so.. what does this mean? havent got too the others yet. taking a break. will check all and update the thread. thanks for the help!

07-13-2013, 08:36 AM	#18
Rufton Registered User Join Date: Apr 2013 Location: Knoxville TN Posts: 1,170	Re: Smoke from one side of exhaust You could apply compressed air to #1 and see if air escapes through ex pipe (stuck ex valve), dip stick tube (possible ring/piston failure), etc for clue.

07-13-2013, 04:39 PM	#19
Mrdsmoke420 Registered User Join Date: May 2013 Location: USA Posts: 33	Re: Smoke from one side of exhaust Ok i will try that. Any others that had this happen? Posted via Mobile Device

07-13-2013, 04:41 PM	#20
Mrdsmoke420 Registered User Join Date: May 2013 Location: USA Posts: 33	Re: Smoke from one side of exhaust The driver side is 1- 0 3- 100.5 5-100.5 7- 115 Passenger.. 2-0 4-125 6-130 8-145 Posted via Mobile Device

07-16-2013, 07:41 PM	#21
Mrdsmoke420 Registered User Join Date: May 2013 Location: USA Posts: 33	Re: Smoke from one side of exhaust nobody has an answer to this?

07-16-2013, 08:20 PM	#22
Rufton Registered User Join Date: Apr 2013 Location: Knoxville TN Posts: 1,170	Re: Smoke from one side of exhaust Did you pull vc to see if valves stuck open?

07-16-2013, 08:32 PM	#23
Mrdsmoke420 Registered User Join Date: May 2013 Location: USA Posts: 33	Re: Smoke from one side of exhaust What do you mean by vc. I have not tried to see if a valve was stuck, no. How would i do this Posted via Mobile Device



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