I have swaped the modules that connect to spark plug wire down into cylinder and problem stayed with clyinder 2. replaced spark plug...no change. Folloed wires to cable harness. looks to go to Computer...I'm stuck
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Re: Miss fire on A4 2nd cylinder from front of car
It is either a faulty fuel injector for cylinder 29try swapping injectors); or the coil module that sends signals to the individual coils..it is mounted inside the air cleaner housing., black in color, rectangular with a harness entering one side and exiting the other..
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What engine ? 2.2 l or 2.4 L. You don't say if any codes are set. no P0303 - P0304 cylinder's 3 & 4 misfire ? or any other ? No the cam sensor wouldn't cause just two cylinders to misfire. The PCM triggers the ICM to turn on an off coil's to build up an collapse the primary voltage inducing the secondary voltage . This engine is equipped with a non-distributor ignition system called the electronic ignition (EI) system. The primary circuit of the EI system consists of the following components:
Two separate ignition coils
An electronic ignition control module (ICM)
A crankshaft position (CKP) sensor
Related connecting wires
The ignition control (IC) portion of the powertrain control module (PCM)
Important: The camshaft position (CMP) sensor is only used for a misfire detection. It is not part of the ignition system. ! How to Test the Ignition Coils GM 2 4L Quad 4
The removal of # 3 & # 4 tells you those cylinders are
contributing the most ,as removing the wire causes the motor
My guess is that the other cyl #1 & #2 are not firing at all, if there
is no change
If you had a V6 or V8 it would continue to run,not so with only
Learn or study the ignition system & replace any ignition control
module that fires the first two cylinders
Get an HEI Test Spark Plug & put the plug wire to that & ground it
& see if you get spark,check all the plug wires one at a time.
Don't forget timing belts that are worn & slip,battery voltage,alternator output & A/C Ripple coming out of it
I would check compression or better yet, do a cylinder leak down test.
Could be you have worn valves in #1 & #2 thus little spark
Check fuel pressure at motor with a gauge
What engine size ? Did you check for vacuum leaks at the intake manifold . How many mile's on the engine ? Oil in cylinders ? weak piston rings , what kind of compression reading's ? Do .compression testing .Have it hooked up to a factory or professional scan tool to check engine sensor data . Unless you like just replacing parts and making part stores rich . Your vehicle also has electronic fuel control , fuel pump driver module ! There is a fuel pressure sensor on the fuel injector fuel rail ! Tell's the PCM how much pressure ! 39 psi is good engine off or idling .
Fuel Pump Driver Module Applications
The fuel pump driver module (FPDM) communicates diagnostic information to the powertrain control module (PCM) through the Fuel Pump Monitor (FPM) circuit. This information is sent by the FPDM as a duty cycle signal. The three duty cycle signals that may be sent are listed in the following table.
you will need to find out why, is it bad spark plug wires or a vacuum leak or injector problems, start by checking the spark plugs and wire first, replace them or swap with another cylinder to see if the misfiire move to the cylinder you swaped with and if it does then you know its a wire or plug, i would start there and if it has been a while since a tune up then i would just install new spark plugs and wire set.
remove the plug from the #1 cylinder, and install it into the #2 cylinder , and put plug from # 2 clyinder in to #1 plug hole, connect plug wires, and start up vehichle, and if computer shows misfire on # 2 cylinder , then you have a bad plug, possibly porcelin insulator could have a hair line crack in it, hope that this information has helped you.
STANDING IN FRONT OF CAR TO THE LEFT ON PASSENGER SIDE CYLINDERS FACING YOU ARE 1 2 3 ON DRIVER SIDE CYLINDERS FACING YOU ARE 4 5 6 ALL THIS INFORMATION I GAVE YOU IS FOR THE 3.0L AND 3.2L DISTRIBUTORLESS ENGINE.WRITE BOTH NUMBERS I GIVE YOU 3 2 1 AND WRITE NUMBER 4 6 5 PUT NUMBER 321 ON TOP OF 465 THAT WILL BE SPARK PLUG WIRES LOCATION ON COILS.THEN ROUTE THEM TO THE CYLINDERS SPARK PLUGS.BESURE TO HOLD PAPER WITH NUMBERS I GAVE YOU NUMBERS STAND IN FRONT OF ENGINE SO YOU WONT MISLOCATE SPARK PLUG WIRES FROM COILS TO SPARK PLUGS.
P0304 is a #4 cylinder misfire. Swap the plug, coil and wire with a different cylinder to see if the code changes to that cylinder or stays with cylinder #4. If the code stays, the fuel injector will need to be replaced. If the code follows the components you changed then your problem is in the components and you can do further swaping of each indiviual component to determine the bad part.
will let we look at simple one first---- you said you getting spark at the spark plug lead , ok , the plug is good ---- check the injector plug -- take it out and see if it have rust or dirth stuff on the injector pins --- if yes clean it ----if not , the injector might me bad . to know what you can inter change the injector and see what happens . reply. if alot of work to to change the injector see one to buy and the cost , which is the best
I would check the valves for number 6. If one or both are burned, stuck or out of adjustment it would cause your problem. If a cam lobe for that cylinder is burned or badly worn it could be the culprit.