pntbllr87

I recently purchased this car just want d a good winter car for family driving. check engine light came on saying there is are misfires in cylinder 2 & 3 checked spark plugs they are good, could it be a none electrical related problem or is their a way to check the ignition coils before spending the money to replace them.

pntbllr87

I forgot to mention I bought it from a guy who had a used motor put in and the mechanic spliced a lot of wires including those going to the ignition coil, is it possible he just mixed wires up the cause them to fire out of order

SloopJohnB@mac.com

switch ignition coil from a pair of cylinders that are not misfiring. Don't you have three coils with two wires out of each coil leading to separate cylinders?

I recall seeing a diagram somewhere for spark plug wire location that would show you which coil wasn't firing 2 or three (probably #1 cylinder, the one closest to the firewall on the passenger side for timing purposes). Be careful because there are a couple ways of numbering cylinders depending on the firing order sequence. The spark plug wire location and cylinder firing order should be posted on a sticker under your hood.

SloopJohnB@mac.com

Anything is possible.

jseklund

I am not 100% positive about the ICM, but from drawings I've seen it looks like it's all one unit, not 3 seperate coils. If it is 3 seperate coils, this could be a good test. Just make sure the wires go in the same spot that you took them from.

A vag-com may be of great help here. You may have some codes that would help us track down the problem.

This sounds like an ignition coil problem, or maybe a cam position sensor problem. You can swap the cam position sensors from one cylinder head to the other to test this. These are the round, cap looking items on the cylinder head, held on with 2 bolts. On the driver's side, the sensor is in the back of the engine by the combination valve, under the coolant resevoir. On the passenter side, it is on the front of the engine. Swap them and see if the misfire goes to the other bank.

My final, left field guess is a loose or faulty combination valve on that bank.

4Driver4

What country is this car located in? If it's a US car, it's a 12v C4; this is the wrong forum.


If it really is a 96 with a 30V (non-US, obviously), then perhaps it was deliberately posted here for 30v knowledge?

In any event, the ignition systems are similar.
-Coil packs rarely (never?) fail on these cars
-I agree that VAG-COM is needed for additional diagnostics
-It's nice that the plugs look good, but they should be swapped with others to see if the skip moves.
-The plug wires (between plug and coil) should be tested for resistance

If a 12v, the ICM is located on the firewall, one unit.

pntbllr87

the local auto store ran a computer scan and the codes that came up were as follows.

p0302 cylinder 2 misfire
p0303 cylinder 3 misfire
p0300 multiple cylinder misfire

I relooked over the wires and the mechanics that replaced the engine spliced the wires that run from the ignition coil to the icm and

Yeah this is not the correct forum I realize this I couldn't find a correct one and I found out they used a similar ignition