My van is coughing like it does not want to go. When it does go we get a check engine light. From running the codes it is all misfires. The repair shop told us two of the coils are bad and we need to replace them. According to the repair shop our van will keep coughing until these two are replaced. We did replace the air filter, changed oil and replaced the sparkplugs but he said we will need to get these coils replaced for the problem to be fixed. Does this sound accurate?
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Crankshaft position sensor maybe , throttle position sensor , coolant temp. sensor etc.... It could be a lot of thing's . Instead of buying this part an that part ,take it an have it diagnosed . To a good ASE certified repair shop . Unless you like buying unneeded parts .
On yours, it's a misfire. Plug, wire or coil pack. Have the codes read. this will tell you where to look. 301 is 1 cylinder 303 is # 3. and so on. Pull the wire off the coil, have it close, no spark, replace the coil. Spark, do a tune up. Plugs and wires.
DTC P0302: Cylinder 2 misfire detected. Probable cause:
1. Check for latest control unit software update
2. Faulty PCM or ECM
3. Faulty fuel injector
4. Ignition system fault. Check ignition module, coil, spark plugs and wires even if these are new replacements
5. Fuel system problem
Sounds like the problem is no spark to plugs. check for spark to and from coils. also the wires and spark plugs. It needs spark and fuel to start. If check engine light is on, Its a possibility that its a bad cam sensor. Check above first! If light is on you can go to any auto parts store so they can read the codes, with a scanner for free. and tell you the problem area. Good-Day!
No spark is the key. look for a loose wire first, then if that does not work test the power source for the coil to see if it is energized. the coil must be supplied with 12 v in order to charge for the spark.
There are a few things that can cause an engine misfire and hesitation. Does your van have a CoP ignition system? (Separate ignition coils for each spark plug) Or coil pack? You may have bad ignition coil(s); that would cause a misfire. If you have a dirty/clogged/leaky fuel injector for cylinder 3, that could also cause a misfire condition. When you replaced all the spark plugs, did you look at the plug from cylinder 3? Did they all look the same? Sometimes you can get clues to what is going on in your cylinder by how the spark plug looks: if it's white or glazed you are running too lean and could indicate fuel injection problem, if it's got burnt oil on it and it's sludgy you may have a leaky gasket or worn piston ring that is letting oil up into the combustion chamber and fouling the plug, causing a misfire. If your check engine light comes back on and it's the same misfire code, have the coil for cylinder 3 checked to see if it's weak or bad. Or you can do a home remedy check and swap a known good ignition coil from another cylinder to 3, reset the code, and see if the misfire moves to another cylinder. If it does, you know the coil is bad. You can pick up an ignition coil for pretty cheap on the internet ($30-$70) if that's the problem and they're simple to install (a pain if they're on a cylinder that's under the intake manifold, but just because you have to unbolt a bunch of stuff to get to it...time consuming but not too difficult). I have a 2001 Mazda Tribute and had a couple of ignition coils go bad, causing misfires. This seems to be a semi-common problem for early 2000's Mazdas.
It means that the number 2 cylinder (passenger front of the engine) is not working. Whether its spark, fuel, or mechanical. The first thing you can check is if there is spark to the cylinder. With the engine running remove the spark plug wire from the number 2 spark plug. Listen or look for spark out of the plug wire. If there isn't than you can check for spark out of the coil pack. Do this with a test light or spark tester. With the engine off remove the number 2 spark plug wire from the coil pack. With the spark tester installed or the test light hooked to ground and placed on the #2 coil post have some body crank the engine over. If ther4e is no spark that you might have a bad coil pack. If there is spark than possibly the plug wire is bad.
You should not drive it with a misfire as you could ruin the catalytic converter which is very expensive to replace.
I have a corolla and had #4 cylinder misfire also diagnosed at
autozone. After changing the spark plugs, problem persisted, along with the same error code, so they
recommended changing the spark plug wires, and that is what fixed
it. I would have changed the rotor cap too, but was low on dough. Glad that was not the problem.