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Old 03 Nov 2011, 08:31 pm
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Default Engine runs rough in 94 Honda Accord after tune-up.?

I just spent $600 on fixing the Oxygen sensor and doing a major tune-up. The Oxygen sensor is fixed and the car has more pep. But when I sit idle at a light, the engine runs kind of rough. They replaced the wires, plugs, air filter, fuel filter, etc. The car has only 90k. I am very upset that after spending all that money, the car still runs rough. Any ideas what could be the cause and how to fix it?
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Old 03 Nov 2011, 08:46 pm
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All you will get here is a guess without access to the car, but my guess is a clogged catalytic converter.
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Old 03 Nov 2011, 09:01 pm
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Could be many things not even looked at.















Did they take a compression check before wasting your money? probably not, as this should be done before any major tune up work is done, and for some reason most garages will ignore this portion of the job.















There is a possibility the engine may need a valve job, valve adjustment, bad or broken ring, broken or weak valve spring, or one of many other items that can make a tune up worthless.















You might also have a fuel delivery problem, vacuum leak, bad tps sensor, (throttle position sensor) and plugged catalytic, or partially plugged, converter.















There are just too many mechanics that think because of their certification paper, they know everything, and ignore the simple basics of engines, plus the charges are way too high when the job, like yours is only half done.















I know of a local garage that recently charged over $700.00 for a tune up, when the original quote was under $300.00, and when done the vehicle still had the problem of bad hesitation on acceleration, when done, and then they asked for an additional $1000.00 for new fuel injectors to fix the problem, with no guarantee that would take care of it.















It turned out to be a $29.00 tps sensor and 15 minutes labor.















Oh yes, the local Ford dealer diagnosed the problem to be a blown head gasket, and a cost of over $3500.00 to fix. Mechanics? I think not.
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