smoke from one side of exhaust

1970mule · Sep 25, 2009

so when i start up the truck, i only get some smoke from my passenger side exhaust. it is not alot but i seem to get none from drivers side. what is the deal? what could that be?

73stallion · Sep 25, 2009

what color smoke? black? blue? white? only at start up, or will it do it if you coast down a hill and get back on the gas?

Jonboy69 · Sep 25, 2009

Do you have a true dual exhaust that is totally seperate from one another ? or does it go to one and then out to two at some point / If so, the routing on the passanger may be more straight and less restrictive so the smoke travels out on that side. Color of smoke can teel a lot too !

1970mule · Sep 25, 2009

the smoke is grayish black, not too much and not that dark. and it is only on startup. also i do have a true duel exhaust.

bmc69 · Sep 25, 2009

bluish/white is oil..greyish/black is fuel. Running a carb?..which one?

1970mule · Sep 25, 2009

i have a holley TA, but why just one side on a duel setup. could it be plugs or a seal or something?

gearida · Sep 25, 2009

Valve seals probably

nrramse · Sep 25, 2009

gearida said:
Valve seals probably

That's my bet too.

It would be a good idea to check the compression all around, then squirt some oil down the spark plug holes and check the compression again. If it goes up, then the rings are bad. If it doesn't then its probably time for a valve job. Or both!

Newell

Dave · Sep 25, 2009

Pull the plugs and see if one is oily.

1970mule · Sep 26, 2009

I pulled the plugs today and the plugs are oily, some more than others. like the one plug was pretty oily and 3 was not the driverside are not that bad. so what does that mean. is it really bad kinda bad?

john74 · Sep 26, 2009

sounds like the rubber valve seals

hillbilly delux · Sep 26, 2009

Broncos are known for the valve guide seals going bad. About 6-8 dollars for seals, a spring compresser, and 2 hrs at the most will fix it.

1970mule · Sep 26, 2009

ahhhhhhhhh, cool i thought i would have to take engine apart. do i need any speciality tools?

Oatmeal · Sep 26, 2009

1970mule said:
ahhhhhhhhh, cool i thought i would have to take engine apart. do i need any speciality tools?

http://www.summitracing.com/parts/OTC-4573/ http://www.summitracing.com/parts/WMR-W84003/ If you don't have an air compressor, stuffing the cylinder with rope and bringing the piston up to the top will keep the valve from dropping into the cylinder too (old school

) ----------Hans

nrramse · Sep 26, 2009

I think you would be better off to have the heads rebuilt by a decent machine shop. They will install new valve guides, seals, check the springs, and regrind the seats.

Not to sound cocky, but you would do well to do a compression check like I mentioned before. If you have bad rings, then its time to have the whole motor rebuilt.

Newell

1970mule · Sep 26, 2009

nrramse said:
I think you would be better off to have the heads rebuilt by a decent machine shop. They will install new valve guides, seals, check the springs, and regrind the seats.

Not to sound cocky, but you would do well to do a compression check like I mentioned before. If you have bad rings, then its time to have the whole motor rebuilt.

Newell

well, i know i hear ya, but my thing is it is a newly rebuilt motor with only about 1500 miles on it, so what could make the rings go bad that fast? i will do the test so i know.

nrramse · Sep 26, 2009

1970mule said:
well, i know i hear ya, but my thing is it is a newly rebuilt motor with only about 1500 miles on it, so what could make the rings go bad that fast? i will do the test so i know.

That could be it too - that because the motor is newly rebuilt that the rings haven't seated yet. It might be a good idea to chat with the engine builder and find out how miles it takes to expect the rings to seat. There's probably a break-in procedure too. Or, if there's something wrong, it might be covered by warranty.

Newell

smoke from one side of exhaust

1970mule

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