Question about 1985 Mercedes-Benz 190

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After changing a valve on the transmission for a smoking problem

The car jerks when changing gears, but no more smoke problem.

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Hello, Sometimes when you install a new modulator valve, you have to adjust it. Take a screwdriver and pry off the rubber cap. You will see several slots cut into the valve and a small metal bar going across one of them. Pull out on the bar slightly and turn counter clockwise about 1/2 to 1 turn and push back in. Replace cap and test drive. You may have to do this several times to get the shift that you want.
CYA Gator241

Posted on Feb 13, 2009

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My car is jerking. It's a 2003 ford tarus. It also


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blue smoke indicates either a bad transmission modulator valve,or a manifold leak{intake} i usually do this test for a bad or suspected bad intake manifold leak,light a cigarette and take it around the intake manifold and look for it to glow really bright for an intake leak,for an exhaust leak you can see it blow the embers away from it.just make sure there's no gas around to ignite.always make sure that a fire ext.is onsite! thank you for choosing fixya.com!

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When driving on the highway somthing slips and forces the truck to slow down creating a jerking motion. no problems in lower gears


depending on how old the vehicle is,it may be a bad modulator valve on the transmission,or just a clogged vacum line to the modulator valve on the transmission. please be specific with year,make and model,but i gave you diagnostic for 89 trhu 99 for most models anyway,research what year,make model of your vehicle.some want to blow smoke and say bad electrical module.do your research 1st beause transmission shops are gonna say replace the transmission to replace the issue. beware the trans shops that use 'god' for logo.some are great,others are ****. ask for a list of customers,and stand in line at those shops for disgruntled customers.do your research,angie's list.com is one way of finding out who does great work. wish you the best.

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By changing gears I've got smoke coming from my exchaust: what can I do to prevent it. What Oil is best for my TDI. Can I use fuel injector oil with the diesel.


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You didn't state iof this happens during a moving gear change, or if it has happened since you physically changed some of the gears in the car. On a TDi, I would follow the factory recommendations for all engine lubricants and additives.

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My 2003 Chev 2500 Duramax is blowing geyish smoke. Checked oil, no sign of water and the oil was recently changed.


check for bad modulator valve on transmission,when bad they cause the engine to smoke greyish or sometimes blueish smoke

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That sounds like valve guides or valve guide seals.When they wear they the car blows smoke out the exhaust.Especially after leaving from a stop

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Hi!

What type of smoke can you see---

white smoke-
If you see a wispy, lingering white smoke that has a bittersweet smell, this is an indication that your car's engine coolant is leaking into the combustion chambers. This may be due to a leaky head gasket, or in a worst case scenario, a cracked cylinder head.

Make sure to take your car to the shop right away to get it fixed.
Thick white smoke---
If your vehicle is belching white smoke upon start-up, it is a sign that transmission fluid is entering the combustion chambers, possibly though a vacuum tube that connects the engine to the transmission.
This type of smoke can be confused with the normal puff of steam during start-up. If you are not sure, have your car inspected at the shop.

Blue/White Smoke--
A blue/white smoke is an indication that oil is being sucked into the combustion chambers through the valve guides. A quick fix for this problem is by replacing the valve seals. Valve seals are small, umbrella shaped pieces of rubber.

Do rate the solution.

Thanks
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