misfireing on 1,3,5!

[jeffast]

my sisters car randomly developed a giant missfire, all three cylenders on the right side are not fireing i can unplug the coils and it makes no differance. the codes come up as misfire cylenders1,3,5, i already substituted a known good ignitor off one of my cars, and it made no differance, any ideas here would be awsome.

[SVXRide]

try replacing the three coils (driven by the fact that it doesn't make a difference if the current ones are connected or not).
-Bill

[Trevor]

Remove the easiest to get at coil, fit a spare spark plug with body grounded and check for spark. If there is a spark you should suspect fault common the all three injectors.

Remember that you are looking for something common to one side of the engine and not single fault. I am sure this is obvious to you as you have already suspected the igniter. I would say not so likely to be an electrical fault, with three individual circuits involved.

[YourConfused]

Have you tried swapping coils from the other side yet?

[SVXRide]

Originally Posted by YourConfused

Have you tried swapping coils from the other side yet?

Brilliant!
-Bill

[Trevor]

Originally Posted by YourConfused

Have you tried swapping coils from the other side yet?

How many bets against the law of average, i.e. that three coils, all on one side, are faulty?

[TomsSVX]

The coil circuits are seperate per bank. meaning 1,3,5 have the same power source. 2,4,6 have a seperate source. If there is a lack of power to the one side all 3 coils will not fire... Quick fix is to use a heavy gauge jumper from the even cylinder side over the odd so they all share the same power source. I would highly suggest finding where the circuit is losing power for a permanent fix

Tom

[SVXRide]

Originally Posted by TomsSVX

The coil circuits are separate per bank. meaning 1,3,5 have the same power source. 2,4,6 have a separate source. If there is a lack of power to the one side all 3 coils will not fire... Quick fix is to use a heavy gauge jumper from the even cylinder side over the odd so they all share the same power source. I would highly suggest finding where the circuit is losing power for a permanent fix

Tom

Okay, I just learned something so I can go to sleep
-Bill

[YourConfused]

Originally Posted by TomsSVX

The coil circuits are seperate per bank. meaning 1,3,5 have the same power source. 2,4,6 have a seperate source. If there is a lack of power to the one side all 3 coils will not fire... Quick fix is to use a heavy gauge jumper from the even cylinder side over the odd so they all share the same power source. I would highly suggest finding where the circuit is losing power for a permanent fix

Tom

Good to know.

[jeffast]

Originally Posted by TomsSVX

The coil circuits are seperate per bank. meaning 1,3,5 have the same power source. 2,4,6 have a seperate source. If there is a lack of power to the one side all 3 coils will not fire... Quick fix is to use a heavy gauge jumper from the even cylinder side over the odd so they all share the same power source. I would highly suggest finding where the circuit is losing power for a permanent fix

Tom

where does said power source hook up to the coils? so i can add a temporary fix till i find the problem.
thank you tom!!!!
also where can i find a wiring diagram for the ignition, that would be invaluable

[Trevor]

Originally Posted by TomsSVX

The coil circuits are seperate per bank. meaning 1,3,5 have the same power source. 2,4,6 have a seperate source. If there is a lack of power to the one side all 3 coils will not fire... Quick fix is to use a heavy gauge jumper from the even cylinder side over the odd so they all share the same power source. I would highly suggest finding where the circuit is losing power for a permanent fix

Tom

Tom, I do not quite understand your terminology. Both sides share the same power source but each has a separate lead/wire/conductor running to two pins in a singe connector. At this point on the input side of the connector the pins are bridged and a single wire then goes to a fused ignition switched circuit. This connector could be considered a common power source I guess and it would appear that there are further junction points further on in the loom.

I can understand what you have in mind but the suggested fix would appear rather physically difficult. The set up means that a jumper wire would have to be connected at some point in the original wiring past the connector and in a position beyond where there could be, or is break in a wire.

It would appear from the queries that this connection point requires defining. Please be sure that I am not trying to be picky, but rather am trying to sort out what is involved in view of the queries.

[jeffast]

what he is saying is that the coils get positive power constantly after the key is turned on, and the ignitor grounds them when they need to fire, cylinder's 1,3,5, are the right bank of the engine, so he is saying that those three share a common power source. so i think he is right, my power source is not connected

[jeffast]

i was tired double post

[TomsSVX]

trevor. When I was wiring the EG33 harness into an SUS I hit the same issue. There was a break in the wire somewhere just before the engine harness. So, a heavy jumper was added just before the engine harness to connect the two banks on the same wire. Simple fix which allowed me to have the car running on all 6. BUT this was temporary until I found where the break in the circuit was in the 1st place and corrected it

Tom

[jeffast]

tom: do you know where i can find a wiring diagram for the ignition, i don't have one and have been unable to locate one