Hey Bill== An a/c takes about 20 horseower to turn the compressor and a 4 cylinder is developing about 30 horsepower idleing so it will slow down and be rough. Sometimes there is a solonoid to help compensate for this but it doesn't help a lot. GoodluckJoe Check your idle air control valve for lack of movement. When you turn on your A/C it puts a load on your engine, the IAC valve compensates for this by increasing the idle. If it's bad or is not being controlled correctly that rough idle you described will occure due to the load on the engine. Regards, Kevin
needs a tune-up and possible carburetor work.
NO. That is to low. If it is a good tight engine it should have at least 150 PSI per cylinder. You can not have any more of difference then 15 LBS per cylinder are the engine will idle rough.
A spark plug is used to ignite the fuel/air mixture inside the cylinder of an internal combustion engine. If the spark plug isn't working, the cylinder won't fire. In a multi-cylinder engine, this will result in rough running and loss of power. In a small, single cylinder engine, this will result in the inability to start the engine.
NO. It should start at about 150 LBS. PER cylinder. And you can't have anymore then a 15 Lb. difference in any cylinder, are the engine will idle rough.
A new engine would have 150 LBS or more per cylinder. A used engine that runs real good and that has plenty of power should have at least 140 LBS. per cylinder. If there is more then a 15 LB. difference in any cylinder then you will have a rough idle and maybe an engine miss at a idle. That means there is an internal engine problem.
The crank sensor sends a signal to control the spark timing to the engine. If the sensor goes bad the engine may run rough or not run at all.
Not running but complete in rough shape, $2000. Very rough shape, $1000.
If white smoke is coming out of the exhaust when the engine is warmed up , it sounds like engine coolant is getting into an engine cylinder
you have a cylinder misfire
Loss of power, missing, rough idle, check engine light,
Have it checked for codes. There will be a misfire code that will let you know what cylinder has the problem.
Check the engines timing to start with. Then check the engine for proper cylinder compression. Check the ignition coil and plug wires for breaks or leaking voltage.
The year and engine size would help but you may have a bent valve or bent pushrod for # 4 cylinder if that is the only cylinder that has 0 for compression.
My idle was running rough and slight loss of power (5 cylinder engine). The power loss is more noticeable on cars with less cylinders.
May be a bad ignition coil - each cylinder has its own located at the top of each spark plug
If you have a loose spark plug, your car will not stall unless maybe your engine has 3 cylinders. If you have a 6 or 8 cylinder engine you would just loose some power and your engine would run a little rough.
do a compression check on that cylinder. check fuel injector for pulse.
The v6 engines have valves burn out constantly, which will cause both the damaged cylinder and the one across from it to misfire.
It should have 150 PSI per cylinder. If it has a reading of 90 LBS. are less on any given cylinder, Then the engine will idle rough at an idle. / engine miss.You can't have anymore then 15 LBS. difference in any one cylinder.150 LBS per cylinder is a good reading on a fresh are good running engine that's in good shape.You may have only 120,130,140 or 150 LBS. That is your highest reading, And engine will run fine as long as there is no more then a 15 LB. difference in any given cylinder.Hope this answers your question. A 100 or less LBS means the engine is tired / Worn out needs rebuilt.
Rough idle could be: spark plugs(worn or wrong gap), plug wires, vacuum leaks, wrong ignition timing, uneven or low compression. Transmission trouble--check fluid level.
the check engine light is blinking and my 03 Nissan exterra is running rough
you either have a cracked cylinder head that is leaking coolent into the combustion chamber causeing rough idleing and eventualy total engine failure. to check this pull out the oil dipstick and see if the oil is thin or watered down you either have a cracked cylinder head that is leaking coolent into the combustion chamber causeing rough idleing and eventualy total engine failure. to check this pull out the oil dipstick and see if the oil is thin or watered down
rough idlingTry cleaning the throttle body with throttle cleaner and tooth brush. Remove the cover first. Soot builds up in this area causing the flap to stick resulting in rough idle. I have cleaned mine to new condition and I still have a rough idle. The dealer told me these motors never idled very smooth in gear.
Sounds like engine coolant is getting into an engine cylinder ( bad head gasket , warped or cracked head or ? )