Question about 1997 Pontiac Sunfire

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Car won't go over 30mph, running sluggish, motor shakes. has new sparke plugs, plug wires, and fuel filter. comprehsion test was good, and when hooked up to a diagnostics machine it just reads "misfire" help????

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My car would get stuck in 2nd gear and not go faster then 30 to 45. I found out it is the output sensor on the transmission might check that out and see if it helps.

I have another problem that i can not figure out. My car has a really rough start sometimes and i can not figure out what it is. Can anyone help me with this?

Posted on Mar 10, 2011

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I would recommend testing the fuel injector if you are certain the spark plug and wire are functioning correctly. If the fuel injector is good run a compression test. If the compression tests fails motor is bad. Could also be an electrical problem if the motor tests good and only does this when the check engine light pops on. Might be a bad ecu.

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Mercedes clk 200 petrol 1999.guys I really need help quickly please. Only brought the car yesterday and already it's a goner. Driving home it was very sluggish. this morning again sluggish....


If it runs good in park or at idle but is slugish when you try to accelerate it is likely a fuel issue. I would start with a new fuel filter. When you press on the gas you need more fuel pressure and if the pump cant get more through the clogged filter you will get that. If it runs bad even at idle it is likely a spark issue and needs new plugs and wires. I would give it a good tune up - oil change, spark plugs (platinum or iridium), plug wires, air filter, fuel filter, PCV Valve and see how she runs after that.

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Why does my 1995 mazda protege sputter and die when i accellerate


An engine needs three things to function correctly: (1) the right amount of fuel; (2) the right amount of air; and (3) an appropriate spark. I would also add a fourth point for a gasoline engine: appropriate compression in the engine. A worn-out engine won't perform well, even if items 1-3 look good.

Poor fuel flow is one possible cause of poor performance. A clogged fuel filter is only one possible cause of that. You might have a weak fuel pump, although with the electric fuel pump on this car, that would either have the car running or not running at all, not running poorly. You might very well have a clogged fuel injector--gas is getting there, but an inappropriate amount is getting sprayed into the combustion chambers. You might also have a clogged fuel intake screen inside the gas tank--the fuel pump might not be able to **** up enough fuel.

Air is another possibility. Check your air filter. Is it clean? A clogged air filter will cause incomplete combustion when you step on the gas because not enough air is getting in to create a proper air/fuel mixture. A simple test for this is to try running the car--VERY BRIEFLY--without the air filter. Does it run better? You should not run your car without an air filter for any longer than diagnostic reasons--sucking dust and dirt into your engine is a fast way to ruin it--but it's an easy and essentially free test you can perform. Or you can just replace the air filter if the one you pull out looks nasty.

A final consideration is spark. If you have a weak spark, you won't get as strong an explosion in your cylinders, yielding less power and stumbling. Or, if the spark comes at the wrong time, you'll have the same problem. You can check for a strong spark by taking a spark plug--an old one, a new one, one that doesn't even match your car, and using it to test the spark coming off each of your spark plug wires. Attach the plug to a wire you disconnect, ground the tip of the wire against exposed metal on your engine, and look for a nice healthy blue-white spark. If you see a yellow or orange spark, that's not so good. That could indicate a weak ignition coil--or also old spark plug wires that are leaking voltage. Spark plug wires should probably be changed every 5-6 years; they're not a lifetime part of your car.

A final consideration I didn't list previously is that you may have a bad O2 or other sensor that measures and adjusts the air / fuel mixture. A bad sensor will force your car's computer to operate on a default profile designed to let you limp home. However, it won't perform particularly well.

Good luck; I hope this gets you pointed in the right direction.

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