The hydraulic clutch hose blew out by a large electrical connector box toward the right rear of the engine compartment. I replaced the hose and everything was fine. 3 days later after driving the car and everything was normal. I went out the 4th morning and went to start the car. It was running very erratic and the engine light was flashing when I was test driving the car. I had the codes read and it was showing a code P0300. I replaced the coil pack, plugs and the ignition control module. I had someone with an analyser check out the car at the time and we discovered that #2 and#3 cylinders quit firing. I thought everything was alright but now when I drive the car it will all of a sudden lose #2 and#3 cylinders and have no power. The check engine light no longer comes on and the misfire condition will not correct itself until I turn the ignition entirely off then back on again. Everything will run fine until the misfiring condition kicks in again. It will frequently occur when I quickly reveup the engine. Turning the ignition totally off then on again corrects the problem.
SOURCE: 1998 Cavalier No Spark in cylinders 1 & 4
ignition mod. grounds,pcm or timing belt could all be it but, I would have to look at timing first.
SOURCE: 1999 Town Car began running very rough - suddenly.
When cleaning your engine, water/degreaser went down the spark plug ports. Try using a air compressor blow gun to remove the moisture from around the spark plugs and boots. The water was causing the engine to misfire on 3 cylinders at first and as the ports started to evaporate the moisture, the less misfiring was occuring. Dry thouroughly and hopefully coils do not have damage to them. Also check to make sure the boot is making good contact with the spark plug.
SOURCE: 2001 Chevy Cavalier Misfire
Have you made sure your getting spark on every cylinder from the coil pack?
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.
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