New carb = smoke?

[Anonymous]

Well I replaced the carb on my 170 '62 fairlane, and (it has never doen this before) but now everyonce n awhil ewhen i start her up it will smoke pretty bad and smell like burning oil. I changed nothing else but the carb, and the vaccuum line to the distributer... Im unsure what would cause the smoke other then a leaky valve seat or burnt ring or something like thta but the motor had a full rebuild less then 5000 miles ago..

In order from changing the carb:
:x

 

[80broncoman]

Didn't you mention in another thread that you tranny wasn't upshifting? You may have a faultly vacum modulater on your transmission. Sometimes when the diaphram lets go inside one, the vacum your engine makes sucks transmission fluid into the intake. It is something to check. It may just be a coinsendece that it happened when you replaced your carb.
Jim

 

[Anonymous]

And by sucking the ATF in thru the carb creating the smoke and nasty smell... man that makes too much sense for me hahaha... Is the modulator inside of the transmission or can i find it somewher eon the outside?

 

[80broncoman]

I am not sure if your tranny even has one , but usally all the older designed trannys did. If it has one they usally look like a vacum advace on the transmission. ford usally put them on the back of their transmissions. just follow all vacume hoses that go back towards the transmissin. Hope this helps. note: sometimes the car companys use steel tubing along the trans tunnel for vacume to the vacume advance. I guess steel tubing is cheaper than rubber hose.
Jim

 

[Anonymous]

It does have one, i snagged one from my buddy bort62 and we replaced it this afternoon but still no shifting and still a burning smell... very good idea tho.. Im swapping trannys next week with another 2 speed auto he has. As for the burning I havent noticed smoke since we replaced it but... ive only driven it twice since then... it doesnt smoke on every startup which is why it bug sme. I mean ill stratup in the morning, no smoke, drive for 20 mins, park, startup after i do whatever, no smoke. head home, head outside, start it up, smokes.... driving me up a wall! and smells pretty bad but not necessarily like burning oil... I cant pinpoint whats goin on... hmmm :roll:

 

[addo]

What colour is the smoke, and where's it coming from?

 

[Anonymous]

whit color coming from the tail pipe, doesnt necessarily smell like oil but i could be wrong?

 

[addo]

Have you had any apparent overheating issues? I ask because antifreeze tends to give white smoke in the exhaust, too. However, a cracked head or split bore is unlikely. My Falcon used to drip ATF onto the headers from the filler tube; this would smoke fabulously.

Sounds like oil seeping past ineffective valve stem seals. Maybe worn valve guides, too. I suggest you pop the valve cover and prod at the stem seals. Check they're all seated down, and flexible to "touch". As for the vacuum lines - you have three off the manifold - trans, brake booster and ? Pull each of these and check for residue/deposits in the lines.

Adam.

 

[Bort62]

We forgot to do a Compression text last time he was by, but we will do that soon as I get back To verify no headgasket problems.

The thing that rules that out in my mind, is the fact that there was no prior problem with this. KISS says headgaskets don't give up at the same time you swap carbs.

We are pulling signifigantly more vaccum now with the new carb, so theorys that we are suckin something up throgh the lines have much more validity.

I am beginning to suspect that brake booster.

 

[Anonymous]

Ok the smoke is definately blue so im guessing with the new carb the vacuum is sucking oil up thru the PCV line (connected towards the right hand lower side of the block in the front) so tomarrow first thing in the AM im going to pull that line off to check for any oil, if there is then ill be plugging that up and changing my valve cover to the kind with the pcv release ontop with a small filter. Im hoping this is it, i'll be pulling and checking the plugs as well and if the plugs are looking good then the last step would be that brake booster.

 

[addo]

Aha! So you've got suction applied to the crankcase. That means you need a breather type oil cap. They're the type with approx ¼" round holes on the underside, and filled with stainless springy mesh stuff. The cap needs to be cleaned thoroughly in solvent or fuel every oil change or so, and lightly oiled. You may have one fitted already, that's clogged.

If you want to draw fumes from the crankcase, try a two-stage system rather like a bong. The crankcase hose vents into the bottom of a metal canister, and at the top of the canister, goes the line to the manifold. Oil picked up from the motor will settle in the can to be cleaned out regularly. Pretty simple to make and service. I actually like the principle of drawing the fumes from the crankcase, as you get (marginally) greater cooling of the motor due to air passing over more distance inside. With a PCV in the top cover, the air makes a track about 8" long only.

One thing at a time. There'll be residual contamination in whichever line is contributing; wait a few miles of full-temp running to be sure it's either fixed or not. If you can get the car up to speed, the net airflow will help this purging, too.

Adam.

 

[66200i6]

On the lack of up shifting, confirm that you are actually getting a vacuum signal from the intake. Start it up and put you finger over the hose that connects to the vacuum modulator. You should be able to feel the suction at that point. If not, work backward to the intake to provide the needed vacuum signal.

Good luck on the repairs, Ric.

 

[Anonymous]

Im going to replace the valve cover with one that has a seperate crank ventalation filter (near the rear of it) to bleed off the crank pressure, and as for the one at the bottom of the block I will probably just seal it off at both ends and remove the line. I will check the vacuum pressure from the vacuum module on the tranny tomarro win the morning, It gets too cold and wet around her ein the evenings!

What I found today when i pulled the plugs were that they are all doing fine, so i popped the line off from the PCV and sure enough there was oil. So Im going to seal off the hol eat the intake manifold (probably with another shnazzy brass fitting) and seal up the hole fitting on the block and hopefully the valve cover vent will give enough ventilation. The reason im doing it like this is im replacing my valve cover with a chrome one (gotta have the bling) that already has the second hole made for the ventilation filter.

Will i run into any problems by doing it this way? bort62's 200ci's vent is this way and i dont believe he's run into any issues with it.