93' cavalier, very rough running. Missing badly at all speeds and loads, including at idle in park. changed plugs and no change in symptons. Is this an injected motor (4 cyl)?
Re: 93' cavalier, very rough running. Missing badly at...
Yes, this is fuel-injected engine. Look for vacuum leaks and then consider replacing the ignition coil (located on back side of the motor). Just follow the spark plug wires and you'll find it.
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Something mechanical, ignition, or fuel.
It can run rough under a load such as in gear and ok in neutral with no load. Have you checked the plugs and dist cap ?
It could be a fuel problem, but in most cases the rough running would continue at road speed. You could certainly change the fuel filter and see what happens. A rough idle but no problems on the road would point to a vac problem or maybe a burnt valve. A fuel or ignition problem would be at most speeds including when you put the engine under a load. Its possible to have a faulty injector on one cylinder that is bad enough to cause a miss at idle but smooth out on the road, but that is a rare occurance.
bad motor mount..check main mount top passenger side..when in gear the motor side of the mount hits the frame side of the mount..just did mine after wondering why it ran like garbage at stop lights..
Yes it is fuel injected. If it runs but has no power there is a good chance that an ignition coil went bad and there would be no spark to two cylinders. Cylinders 1 and 4 are partners on the same coil and 2 and 3 are partners. Usually these cars if an injector goes bad they have an external leak.
You can try to listen to them by holding a screw driver to each on while its running but I don't think
that will be your problem anyway.Another giveaway for the coil could be a gas smell like it is partially flooded. When you changed the plugs were any of them wet with fuel ? There is also a chance that if the engine works ok at highway speeds that the egr valve is stuck open. This causes
rough running at idle and bad hesitation until highway speed is achieved. Hope this helps or let me know and we'll figure it out.
sounds like you left something out. check to see if you plugged in all the sensors and plugs, then check for any vacuum lines that were not replaced or may have been broken
your probably feeling a rough idle of the engine. need a tune up?
in park the engine is not loaded down, just idling at a low rpm=rough
in drive with brake on you have put some load on motor also at low rpm=rough
in drive on the road engine is at higher rpm, = smoother
generally 4 cylinder motors idle a bit rough, especially if one spark plug is not firing right or fouled or one bad spark plug wire. tune up may fix it. if it is not stumbling real bad or stalling then you can live with it.
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