Corrado VR6 Co2 problem

[Michael Davitt 10]

hey guys i am new here to the forum! and have got a serious problem with my VR, iv bought the car as a project trying to save it from the junks but so far no luck. at start up the car seem fine and runs smooth the problem starts after about 30 seconds of running the car it becomes very smoky but still runs smoothly its a sort of white very light blue (when i shine a flash lamp at it) it doesn't seem to lose coolant or oil nor is it old petrol. iv replaced allot of parts here is a list

 

lambda cable

spark plugs

ignition leads

distributor cap

rotor

 

skimmed the cylinder head

replaced the stem seals

replaced the gasket

 

the stem seals and skimmed cylinder head where done by a expert

 

the vr6 prier to the cyl head being done had an un idle revving, i thought by repairing the cyl head the smoke would go away to but it didn't repairing the cyl head has fixed the un idle revving.

The only reason the corrado VR is not passing the test is because of emissions test. failed at 8% are there perhaps any sensors that i might have missed that might contribute to such a high emissions ?

 

Corrado vr6 1992

European AAA motor

 

 

thanks.

[Roger Blassberg 0]

It could be that the blue temperature sensor on the thermostat housing is making it run very rich (ie too much fuel when it has warmed up) I assume you mean CO (carbon monoxide) not CO2 (carbon dioxide). Or maybe your catalytic converter has been contaminated and is no longer functioning properly. Take out a spark plug and look at the colour of the electrode. Is it black and sooty? - if so it is running too rich (blue sensor problem). What fuel consumption are you getting? Overall mixed driving you should be getting 8,5 or 9 litres/100km. Much more than that and there is something wrong.

 

Best wishes

RB

[Michael Davitt 10]

hello RB i will change the blue sensor straight away and let you know in a day or 2, yes sorry the CO, iv taken out the sparks and yea there quite black. fual consumption is really really bad iv seen nothing like it. i dont know exactly but its way over what you mentioned above.

 

thanks for your fast replay

[Kevin Bacon 5]

Lambda control starts at 70 deg C water temp. If you have VAG COM, you should see the CO reduce drastically at 70 deg. If not, your lambda probe may need replacing (with a VW one, cheap ones don't work as well).

 

Could it be your emissions test is being done before the engine has warmed up?

 

Does the smoke smell of fuel or burned oil? Hopefully fuel!!

[Michael Davitt 10]

hello Kevin it failed the mot so yes im sure they let the car warm up and it failed 2 time on CO its a shame good car good condition motor ruined. unfortunately i don't have a Vag com i did have a cheap one but it worked like once ore twice and the just failed on me Ebay eh never again . its defiantly fuel smells like a old lawnmower! im going to replace the blue sensor as its the only thing left to change on the motor all the rest has been replaced haha so much money! if the sensor doesn't work il make a video and post the link to you tube. the sensor is coming monday and il install it in the evening.

[Roger Blassberg 0]

Don't despair Michael !! It will get sorted out. Just be prepared to put up with disappointments and a few expenses and your Corrado will give you a great deal in return. The sensor installation is straightforward enough. There is a bracket above the sensors held on by one small screw (10mm hex head). Take it off to get the sensor locating clip out, pull out the sensor, put in new sensor AND sealing ring, reconnect and refill coolant system.

 

RB

[Michael Davitt 10]

so iv replaced the part but no luck the car still is quite smokey. all though it did get better as the car warmed up. to be honest there wasn't much of a difference in changing the temp sensor, i think this vr6 has had its day lol

[Roger Blassberg 0]

Did you have a look at the sparkplugs? What colour are the electrodes? Are they oily or covered in sooty deposits? Or maybe only one or two are? You may have a defective injector stuck open and putting too much fuel into the cylinder - a sooty plug will reveal that. The injectors are relatively easy to get out and can be cleaned and restored. An oily plug will probably mean severe bore wear, especially cylinder 1 or 6, or a broken piston ring with all that entails.

Keep at it!!

RB

[Michael Davitt 10]

alright so iv let it running the for a day because iv done the cyl head and there was old petrol in the tank and it seems to run perfect again so happy :D iv also cleaned the injectors so she is live new. iv already sold it to a very happy buyer who has more VR6s so its got a nice home. he mentioned a showroom position so i was delighted. thank for all the help. il be back tho iv got another one lined up a 2.0 16v with strange breaking problems so that is going to be the next project il start in a week or 2.