Black Smoke On Start Up

[suiplap84]

My Avensis 2.0 vvti recently started giving a puff of black smoke when starting the car. After that, no more smoke! :-p

If anybody has any idea to why this happens please help.

Thanks guys!

[The Cav]

could be your valve stem seals allowing a drop of oil down to the piston top

is your oil level dropping

is the smoke definatly black or blue

[Jamesbelfast]

Black smoke is a sign of over-fueling. Have you checked the air filter?

It could also be due to a faulty engine coolant temp sensor.:)

[Red Yaris 54]

Black smoke usually means that they have failed to elect a Pope ;)

[Thermal]

But... in this case, you certainly don't want to see white smoke. :!Removed!:

[igormus]

My Avensis 2.0 vvti recently started giving a puff of black smoke when starting the car. After that, no more smoke! :-p

If anybody has any idea to why this happens please help.

Thanks guys!

check with MAF sensor + clean throttle valve + do not forget to inspect all spark plugs

cheers

[suiplap84]

Cheers guys for all the replies. had a look and the exhaust is a bit black. when i was sitting next to the exhaust i could smell a strong scent of petrol so any comments on that?

[igormus]

Cheers guys for all the replies. had a look and the exhaust is a bit black. when i was sitting next to the exhaust i could smell a strong scent of petrol so any comments on that?

check with sparks first

cheers

[suiplap84]

Cheers guys for all the replies. had a look and the exhaust is a bit black. when i was sitting next to the exhaust i could smell a strong scent of petrol so any comments on that?

check with sparks first

cheers

Yeah I did that mate, pulled all the leads out one by one to see if all the cylinders were firing then pulled out the lugs and the were all fine with a nice grey/white burn color on the points. I do however do mostly motorway miles, but for the last 2 weeks just been driving in town (short distances) Got back on the motorway yesterday so Ill go have a look at the color of it now and if it gives the black puff on startup. Can you think of anything else that might be wrong? Thanx for your help anyways!

[igormus]

Cheers guys for all the replies. had a look and the exhaust is a bit black. when i was sitting next to the exhaust i could smell a strong scent of petrol so any comments on that?

check with sparks first

cheers

Yeah I did that mate, pulled all the leads out one by one to see if all the cylinders were firing then pulled out the lugs and the were all fine with a nice grey/white burn color on the points. I do however do mostly motorway miles, but for the last 2 weeks just been driving in town (short distances) Got back on the motorway yesterday so Ill go have a look at the color of it now and if it gives the black puff on startup. Can you think of anything else that might be wrong? Thanx for your help anyways!

ok i'd cleaned both MAF sensor and throttle valve. they might to give a wrong signal to ECU.

cheers

[Druid Boy]

It might be as simple as a slightly rich fuel mixture to get the car started in the same way that a choke would richen the mixture. If it only happens on starting how much of a problem is it really? did you check your air filter as James suggested?

[suiplap84]

Cheers guys for all the replies. had a look and the exhaust is a bit black. when i was sitting next to the exhaust i could smell a strong scent of petrol so any comments on that?

check with sparks first

cheers

Yeah I did that mate, pulled all the leads out one by one to see if all the cylinders were firing then pulled out the lugs and the were all fine with a nice grey/white burn color on the points. I do however do mostly motorway miles, but for the last 2 weeks just been driving in town (short distances) Got back on the motorway yesterday so Ill go have a look at the color of it now and if it gives the black puff on startup. Can you think of anything else that might be wrong? Thanx for your help anyways!

ok i'd cleaned both MAF sensor and throttle valve. they might to give a wrong signal to ECU.

cheers

Where abouts are these situated mate?

[bestseany]

Could also be a faulty O2 sensor causing an incorrect fuel mixture.