• Tiny
  • papet
  • 2000 Dodge Caravan

Engine Performance problem
2000 Dodge Caravan 6 cyl Front Wheel Drive Automatic

Hi Bob and Ken,
Does a MAF sensor does something to make the hydrocarbons high? And where do I start to check for a vacuum leak?
Thanks once again because all your advices are so helpful and hoping for your most appreciated reply once again.

Wednesday, November 18th, 2009 AT 9:33 PM

1 Answer

  • Tiny
  • ch112063
  • Member

Yes. Any unburned fuel that escapes through the exhaust, is called Hydrocarbons(HC). I have been dealing with hydrocarbons for the State of New Jersey for as far back as 1983. A spark plug, wire, any secondary secondary ignition problam will cause a misfire and high HC's, a state failure for emissions testing. Of course a mixture that is too lean will have an incomplete combustion, causing the same problem, especially with a Mass Air Flow type of fuel injection system. The areas to look are vacuum hoses, intake manifold leaks, EGR leaks, positive crankcase ventilation system leaks, and many others. I sometimes use a tachometer, and a spray bottle to check different spots for changes in RPM's while engine is running when I spray water, or carb. Cleaner lightly in spots.
Any loose clamps in the air intake, before, but especially after the air flow sensor. A leak down test can also be used. A good visual check is first. I hope I have helped you in some small way.
I appreciate you.

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Wednesday, November 18th, 2009 AT 10:48 PM

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