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Old 20-04-2017, 19:17   #16
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Ok started it up when I got home from work, all good firing on all 4.

Left it running to get it up to temp, gets up to temp and suddenly starts missing.
All the injectors are pulsing but no spark on a couple cylinders.

Take the plugs out put them back in it starts straight up running on all 4 again.

Seems like it gets up to temp then starts missing? Gonna plug a reader in see if I get any fault codes.
Given you've already swapped coils and plugs I'd check the wiring to the coil pack for 1 & 4 has a stable voltage at the plug because the wet plugs sounds more like it not sparking rather than flooding to me. It would be worth doing this before it misfires (cold) and when it is misfiring (hot) and noting if there's a difference.

Might be a long shot here, but couldn't the cam sensor beginning to fail cause this type of fault? For the time it takes to swap could you move it between cars?

I'm just thinking out loud so feel free to ignore if I'm taking out of my rear end
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Old 20-04-2017, 19:23   #17
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Seeing that I have spark on all 4 coils could this be a fuel issue? I'm running RC750 injectors, can they cause this type of problem? Or can injectors just break down?

Any help gratefully received chaps.
4 coils? so is this an evo engine with COP conversion?

thinking out loud (so maybe wrong ) but if its originally the same as an evo setup, 1 and 4 would have shared a coilpack on a wasted spark set up, which would make me focus on the wiring for those coil packs, see if its losing signal for some reason

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Old 21-04-2017, 07:21   #18
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Given you've already swapped coils and plugs I'd check the wiring to the coil pack for 1 & 4 has a stable voltage at the plug because the wet plugs sounds more like it not sparking rather than flooding to me. It would be worth doing this before it misfires (cold) and when it is misfiring (hot) and noting if there's a difference.

Might be a long shot here, but couldn't the cam sensor beginning to fail cause this type of fault? For the time it takes to swap could you move it between cars?

I'm just thinking out loud so feel free to ignore if I'm taking out of my rear end
I was thinking cam sensor, luckily I've got 2 RVR's so tonight I'll swap the cam sensors see what happens.

As to checking the voltage whats the easiest way to do that, bearing in mind electrics aren't my strong point

Crazy thing is the cars never been a problem in the last 3/4 years I've owned it. Problems like this are so annoying.

Cheers for your input
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Old 21-04-2017, 07:24   #19
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4 coils? so is this an evo engine with COP conversion?

thinking out loud (so maybe wrong ) but if its originally the same as an evo setup, 1 and 4 would have shared a coilpack on a wasted spark set up, which would make me focus on the wiring for those coil packs, see if its losing signal for some reason

Stu
Yes its an evo engine with a COP kit fitted.
I'll check all the wiring again later, as the middle wire on the connectors is the signal wire I believe. Pain up the harris
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Old 21-04-2017, 07:33   #20
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I was thinking cam sensor, luckily I've got 2 RVR's so tonight I'll swap the cam sensors see what happens.

As to checking the voltage whats the easiest way to do that, bearing in mind electrics aren't my strong point

Crazy thing is the cars never been a problem in the last 3/4 years I've owned it. Problems like this are so annoying.

Cheers for your input
I'd try the cam sensor first, 30 second job to do as you've got access to one

Assuming that doesn't solve it, if you've got a multimeter, set it to DC Volts and put the black (common) probe on the middle of the 3 pins in the grey coil plug. Then put the red probe to the pin on the left of it (depending which way up the plug is, may be the right side). You should see battery voltage (within 1 volt) on the correct pin and nothing on the other one. Compare the reading to the voltage you the on the plug for 2 and 3. They should be exactly the same, unless you're using a very high end meter!

As Stu asked, have you got a COP kit? The harnesses are hit and miss as many people have many different ways of assembling them- some good and some not-so-good, so if you only swapped coils I would look at changing the harness over or refitting standard coils if you can.
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Old 21-04-2017, 07:54   #21
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I'd try the cam sensor first, 30 second job to do as you've got access to one

Assuming that doesn't solve it, if you've got a multimeter, set it to DC Volts and put the black (common) probe on the middle of the 3 pins in the grey coil plug. Then put the red probe to the pin on the left of it (depending which way up the plug is, may be the right side). You should see battery voltage (within 1 volt) on the correct pin and nothing on the other one. Compare the reading to the voltage you the on the plug for 2 and 3. They should be exactly the same, unless you're using a very high end meter!

As Stu asked, have you got a COP kit? The harnesses are hit and miss as many people have many different ways of assembling them- some good and some not-so-good, so if you only swapped coils I would look at changing the harness over or refitting standard coils if you can.
Nice one thanks for the instructions, and yes its running a cop kit. I have another COP harness so I'll check that over and plug it in. Failing that the other RVR is running std coils etc so I'll take it off and try it on mine.

Thanks
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Old 22-04-2017, 18:38   #22
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Ok came home from work and tested the cop kit with multimeter, all spot on at 11.79v.

Fired it up all good running on 4, left it ticking over, 10 mins later its missing again.Had a look at the standard coil packs in the black one different connectors FFS so go and dig out the spare cop kit harness and find half the wires hanging out of a plug. Had a really close look at it and its a load of crap so in the bin with it.

Ok back to square 1, the injectors are working so it has to be wiring to the cop kit. Fired it up again still missing and started wiggiling wires, got to plug 4 and after wiggling the wire it all came back firing on 4 again. Tried it a dozen times and if you hold the wires into the plug at a certain angle it miss fires along with number 1 as they are wired together. Wiggle it about and it fires on all 4 again.

So fingers crossed I'm right and a new harness will sort it. Thank fuk for that.

Also many thanks for all the input guys really appreciate it

Any ideas who can make a COP kit harness for me?
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Old 22-04-2017, 18:47   #23
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Should be able to repair that failing connection, rather than a complete harness. Never messed with a COP kit but there cant be much to the harness?

Also, the voltage of 11.79, seems low to me. Assume the engine wasnt running (??) but even so that seems a little low

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Old 22-04-2017, 18:56   #24
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Should be able to repair that failing connection, rather than a complete harness. Never messed with a COP kit but there cant be much to the harness?

Also, the voltage of 11.79, seems low to me. Assume the engine wasnt running (??) but even so that seems a little low

Stu
The voltage was without the engine running.

The cop kit wires that are playing up are on cylinder 4 and they are so short I would need to strip it all back and put longer wires in it.As the connectors in the plugs don't really come apart. I'm no auto electrician but could probably do it if I have to.

Rather have someone make me up a harness that knows what they are doing.
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Old 22-04-2017, 19:30   #25
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The voltage was without the engine running.

The cop kit wires that are playing up are on cylinder 4 and they are so short I would need to strip it all back and put longer wires in it.As the connectors in the plugs don't really come apart. I'm no auto electrician but could probably do it if I have to.

Rather have someone make me up a harness that knows what they are doing.
would have thought a wanted post on here should get you 1 sorted

Stu
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Old 22-04-2017, 20:25   #26
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The voltage was without the engine running.

The cop kit wires that are playing up are on cylinder 4 and they are so short I would need to strip it all back and put longer wires in it.As the connectors in the plugs don't really come apart. I'm no auto electrician but could probably do it if I have to.

Rather have someone make me up a harness that knows what they are doing.
Glad you've found the fault, as alluded to earlier, some people's methods of assembly leave a little to be desired. Although this is assuming your loom hasn't suffered mechanical damage.

I've a COP harness you can have for £20 as it was made with used coil plugs. Not pretty but does the job, or I can make you a new one up as I've a spare set of plugs knocking around from when I did mine- but I won't have time until next weekend to do it. Would work out around £70 with post as the plugs are all from the US. Happy to do it if it helps you out
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Old 23-04-2017, 10:56   #27
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Glad you've found the fault, as alluded to earlier, some people's methods of assembly leave a little to be desired. Although this is assuming your loom hasn't suffered mechanical damage.

I've a COP harness you can have for £20 as it was made with used coil plugs. Not pretty but does the job, or I can make you a new one up as I've a spare set of plugs knocking around from when I did mine- but I won't have time until next weekend to do it. Would work out around £70 with post as the plugs are all from the US. Happy to do it if it helps you out
If you could make me a new harness that would be great

I'm only just outside Guildford, so could drop the existing harness off to you to copy. As the connectors each end that go into the loom are not standard Mitsi ones

I'll send you a pm
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Old 26-04-2017, 12:33   #28
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Check plugs are gapped correctly.
Check leads are good and fixed correctly.
Check coil packs are good and fixed properly.
Damn....













...feels good to be right.
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Old 26-04-2017, 14:43   #29
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What can I say you were pretty much spot on.


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