Perhaps the black tailpipe results from the enrichment mode of the engine. Most, if not all, gasoline engines run rich at high loads. The engines are enriched as a function of throttle position or some convolution of throttle position and air flow or straight out manifold air pressure (not the VW Vanagon, it doesn't use Manifold Air Pressure: MAP). Try putting in a good O2 sensor and monitoring operation, it should read about ~0.4 volts at stoichiometric and ~0.8 volts at rich operation ( ~0.0 volts at lean operation) a new sensor should only cost about $15. Try to get hold of an analog volt meter to do the measuring.
Remco 87 Toy MR2 85 Vanagon RIP |
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