Volvo C70 This sporty coupe has a three-piece retractable hardtop for unsurpassed fun whether the the top is up or down.

02 C70 white smoke from exhaust

  #1  
Old 06-20-2019, 04:40 AM
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Default 02 C70 white smoke from exhaust

Replaced camshaft sensor, turbo sensor, map sensor, crankshaft sensor, ignition coil, spark plugs fuel injectors and NO Service lights on dash. Car started and runs pretty good. With typical exhaust color. Returned to the car a day later rev the engine a couple of times and drove a small space. Large cloud of White smoke.
I did the glove test and it passed. No milky substance on oil cap. Doesn't overheat. I still have to change the oil and get quality spark plugs. But can it be the turbo?
 

Last edited by Missy Moton; 06-20-2019 at 04:42 AM.
  #2  
Old 06-20-2019, 11:28 AM
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are you consuming coolant? if so that can happen via the head gasket or the turbo seal. If it happens once in a while and only on a cold start with no coolant loss, then it may be condensation in the engine/exhaust or it could be oil dripping in via the valve seals or a leaky injector. Any oil consumption?

with the spark plugs, don't go fancy - best bet is simple OEMs from a Volvo friendly site like Tasca Parts or FCP. Check the color of the plugs when removing to see if they are a consistent tan color. Watch the oil and coolant levels over the next 500-1000 miles or so.
 
  #3  
Old 06-20-2019, 12:13 PM
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Default White smoke

No excessive oil or coolant consumption but the white smoke did come from the exhaust. Going to test drive a longer distance but the smoke is too embarrassing to drive long distance
 
  #4  
Old 06-20-2019, 12:18 PM
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Default White smoke

I also wanted to mention the fact that before I rev the engine that exhaust smelled rich
 
  #5  
Old 06-20-2019, 04:28 PM
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normally running rich would throw a code if it runs rich too long. seems plausible that a leaky injector could allow fuel to drip in while the engine is off leading a puff of smoke at start up. Valve seals can do the same thing but usually cars with valve seal issues will consume oil. A quick test is to put the car in low, accellerate to high rpms and let off the gas (without the car shifting), if it puffs a cloud it means its pulling oil past the rings or the valve seals . I'd look at the plugs to see if any look wet or black
 
  #6  
Old 06-27-2019, 01:43 PM
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Default White smoke

MissyC70
I have a C70 same problem everything that you listed I had codes po237-turbo / supercharger boost sensor a circuit low, po236- turbo / supercharger boost sensor a circuit range / performance, p0455 -evaporative emission system leak detect gross leak no flow, po335-crankshaft position sensor a circuit and the service engine light and check engine light were on.
Then I replaced the turbo charger boost pressure valve, manifold pressure sensor, map sensor, crankshaft sensor the cam sensor, spark plugs, ignition coil. I just ran the car for over 30 minutes,. Cold the car has no white exhaust smoke, No service lights or check engine light but once it heats up lots of white smoke and service light on but not constant. the light went out aft I rev the engine. All levels were fine, oil and coolant were fine. I did notice a small faint smoke coming from the back part of the engine not where I could see.
I ordered the blown head gasket tester kit and plan to test tomorrow.
 

Last edited by Missy Moton; 06-27-2019 at 02:20 PM. Reason: Forgot to mention
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