Off hand three things come to mind; cheapest to most expensive , Temp 2 sensor, O2 sensor, and plugged cat or other exhaust restriction. When my cat was on its last legs some years ago. The exhaust pipe would drip a grey-ish milky looking liquid when parked. As long as I kept the revs up it would cripple me home, but lower rpms it wouldn't want to run. It(the cat) would be getting really hot too if that were the case. With it okay at Hwy speeds, that pretty much rules out ignition plugs or wires or fuel injectors, as that would be under substantial load. The true gurus will chime in and BTW, do whatever Dennis Haynes says tp!!! DM&FS At 06:12 PM 2/19/2011, John Goubeaux wrote: >I'm on the road and several hundred miles from home ( southern CA) and >my 90 Vanagon has begun to run bad. It is missing and has a serious >reduction of power when under load. It starts up and idles, but is >running real rough, no backfiring though. Its almost as if there is a >fouled plug or bad ignition on one of the cylinders Or its running way >too rich. I pulled the plugs and replaced them with clean re-gapped ones >but no improvement. I inspected the plug wires and they are in good >shape, almost new, so I doubt this is a problem, BUT I've seen a bad >plug wire cause this type of behavior before. I cannot imagine that >timing has changed. I should be able to limp back home as once up to >speed the car runs OK and is not overheating and oil pressure is good. > >Are there any tips on simple things I can check ( while on the road) to >at least eliminate any other obvious possibilities? > >Thanks for any suggestions! > >-john |
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