Fault code is 2746. Replaced ignition coil and spark plug but fault still there and No. 2 ignition coil resistance too high. I also change the venose but fault still persist. I have checked compression and intake leakage valve timing every thing is perfect but fault still there.
Try changing the spark plug/ignition coil to a different cylinder and see what happens. Compression test would be a good idea. A common problem is the boot at the throttle body cracking but vacuum leaks can be hard to find, sometimes it's a good idea to someone else take a look.
SOURCE: 95 GMC Jimmy 4.3l W vin rough idle
My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.
SOURCE: misfire in cylinder 1 2001 mercury sable
Next change swap the injector with another and see of the problem moves. If it does it's a bad injector.
SOURCE: Check engine light
A multi misfire may mean that one or more of the following has happened:
Faulty spark plug or wires, Faulty coil (pack), Faulty oxygen sensor(s), Faulty fuel injector(s), Stuck/blocked EGR valve / passages, Faulty camshaft position sensor, Defective computer.
The engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wire, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the the problems were faulty fuel injectors.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.
Good luck and hope this information helps, keep me posted, be glad to help you get the truck running 100% again. Not sure if your running a K&N air filter, and if you are there may be a flim of oil on the MAF sensor that is making you run lean. You may want to spray down the MAF sensor with a can of MAF cleaner.
SOURCE: 2000 toyota 4runner pulling a random misfire in
try a new crankshaft sensor not hard to change 2 bolts and a wire
SOURCE: 2.2 ecotec engine. Code says random misfire. What
did you fix it? if you did what did you do? i have the same prblm thanks!
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