Year: 2002
Wagon
189,000 Kms.
2.0 Ztec
Fuel injectors cleaned - manually (not from a bottle!!)
SO it does not misfire above 2000 rpm?
DO we know what fuel pressure is at?
Any codes in the computer?
Only misfires up to 2000 rpm when under light load in second gear and higher.
Fuel pressure unknown
Computer codes not checked at this time
Well, your egr ports may be plugged up. Try disconnecting the vacuum line to the egr valve and see if that helps.
Let me know!
Well, all you would have to do is just pull the vacuum hose that goes to the EGR valve and take it for a test run. You would know right off of the bat if this is takes care of your problem.
If it does, we are on the right track. If not, I have plenty more tricks up mu sleeve.
When was the last time the engine was tuned up? No, not just plugs, but a full tune up! The whole nine yards! Any part of the secondary ignition will do this including the ignition coil or coils! This sounds like a classic ignition misfire! They usually go bad under a load like under acceleration, but can be noticeable at any time. It is very important to have your engine equipped with good tune up parts or you may be causing damage to other components of you car like the catalytic converter which can be expensive!
Possible causes:
Ignition misfire causes by any bad tune up part and or ignition coil or coils.Bad spark plugs, spark plug wires and cap and rotor (if equipped)Wrong tune up parts spark plug, wires etc...
The quickest way to check the ignition components, is by looking closely for leaking secondary voltage. Visual look at all the tune up parts to see if you can see any sparks coming from any of the wires or coil (or coils) when the vehicle is running. If not, you can put your hand on the coil/coils and wires when the engine is running and see if you feel any small voltage leaking form the tune up parts.
It will leak secondary ignition voltage from the tune up parts caused by high resistance from carbon tracking if they are bad. This is very common if the tune up parts are not changed regularly!
If any is found, the tune up parts are simply bad and will need to be replaced! If none is found than you can spray a mist of water on the tune up parts when the engine is running and see if that causes the engine to stumble or run rough at all. Again, if it does, the tune up parts are bad and will need to be replaced!
ALso, you could have a bad mass air flow sensor. Or the snorkel from the mass air flow sensor to the throttle body could be ripped. Both are very common and can cause you vehicle to loose power along with many other drive ability issues. First look for cracks or rips or anywhere air can enter the engine that is not accounted for by the mass air flow sensor. Next comes the Mass Air Flow (MAF) sensor. This is a very important sensor input to the computer. It uses a hot wire sensing element to measure the amount of air entering the engine. The MAF sensor then outputs an analog voltage signal to the PCM proportional to the intake air mass. The PCM calculates the required fuel injector pulse width in order to provide the desired air/fuel ratio. If the sensor is bad than this air/fuel ratio will be off causing severe performance issues. In extreme cases, I have seen these two problems cause a no start condition. This input can also be used in determining transmission Electronic Pressure Control, shift and torque converter clutch scheduling. The check engine light may even pop on if the sensor is bad, the snorkel is ripped or a tube has fallen off. This will result in a lean condition.
ASE MASTER TECH
ADVANCED LEVEL SPECIALIST
Hello!
Did you have any further questions?
THanks for the accept!
Glad to hear is all fixed!
Let me know if you have any further questions!