running fine,then bucks

Asked by Jan 17, 2012 at 05:57 PM about the 1997 Volkswagen Passat 4 Dr GLX V6 Sedan

Question type: Maintenance & Repair

Hello,we have a 1996 Passat 4cyl. It purrs like a kitten,but after 10 or 15 min. it bucks like crazy.The refs go up and down with some back-fires.We installed new plugs, wires,fuel filter,fresh gas.(even added gas-treatment).Any ideas???

3 Answers

4,935

Hmmm....a clogged catalytic converter might be the culprit... but, backfires are uncommon unless there's a serious overage of fuel in the exhaust. I would check the CAT first...then look for an injection issue.

65

Does the bucking and messing about continue or clear up? In 10 to 15 minutes the engine would get hot. I would guess at a sensor failing and delivering a very rich mixture, over-fuelling would cause all of those symptoms. Get it on a diagnostic computer with someone who knows how to use it.

4,935

1996 Passat should have an OBDII computer (on-board diagnostic). IF you had a sensor throwing a code, you would have a light on the instrument console. A visit to a diagnostic center is a good idea.

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