Question about 1990 Volkswagen Corrado

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Black smoke and sluggish when accelerator is fully depressed

I knw that it is running rich and have been told that that could be a sensor problem. what sensors if any should i replace. Also, my model (the 90' 1.8L G60,) has no mass air flow sensor. I have also just replace one of the two coolant temp. sensors.

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It sounds like a boost problem to me, if it starts normally and idles fine. when under load it needs boost,check your lines coming from the blower(up front) if its not getting enough boost it will run rich (no power black smoke) good luck.

Posted on Jan 06, 2009

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Have you tried the throttle positioning sensor?. alot of times that could be one of the main reasons for it running rich. also check your oil level, too much oil will push pass the rings into the combustion chamber,or maybe your rings are worn down and need to be replaced.change your air filter,and make sure that your spark plugs are gapped properly, and that you use 8mm plug wires.the sluggishishness (lol) could be too much carbon build up on the spark plugs, not allowing it to properly fire. it may have also jumped time causing it to be sluggish, jerking and black smoke. black smoke isnt because it's running rich, it would be blue smoke. black smoke is oil burning.so i hope that this is helpful to you.

Posted on Dec 18, 2008

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It seem like a vaccumn problem. Check the vaccumn lines especially the one going to the fuel preassure regulator. or it could be the regulator itself.

Posted on Dec 18, 2008

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r/
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