My Nissan QX is experiencing an engine stutter whilst accelerating. There is also an occasisional misfire whilst the engine is idling and in gear. The car seems to drive fine at motorway speeds and the problem is most noticeable at 30-40 mph. The problem has been occurring intermittently for some time but has recently become more persistent. It feels as though one of the cylinders may not be firing but the check engne light is not illuminated. Any help would be greatly appreciated.
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Could be a transmission problem or something as simple as bad spark plugs. The engine is under the most load when RPM is low and you are trying to accelerate, such as when it upshifts. You should have the computer checked for trouble codes and hopefully that will point you in the right direction to test. If the spark plugs have more than 50,000 miles of wear you might start with replacing them.
Check the front O2 sensor. I had a 99 Jeep that would stutter and seem to lose power while accelerating. No check engine light came on but took it to a shop and had them put it on a computer. Come to find out that the O2 sensor was giving the engine misreads and was telling the engine to take in more fuel. Causing one of the cylinders to misfire.
Check the plugs condition. Check the high tension voltage leads to the plugs - measure the resistance of each lead in in turn (so as not to loose track of which lead goes on which plug). Generally 6,000 ohm is usual but it depends on lead length. However if there is a continuity fault the resistance will be very very high. Have the cylinders pressure tested. If you suspect an intake manifold leak check all vacuum leads feeding off it. If the leak is suspected at a gasket joint spray the suspect areas with WD40 releasing fluid whilst the engine is running. Releasing vapour will be sucked in and this causes the engine to rev more quickly. Sometimes just tightening the intake manifold bolts a quarter turn can sort out minor air leak issues
This is what you need to do, change the plug wires, because if there is a bad wire you would definitely experiences sputter or a stutter, so do the plug wires and at the same time do the spark plugs, this should take care of your problem. if not let me know and i will give you the next step