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Discussion Starter · #1 ·
This is odd, started using the RVR for work everything good then suddenly the engine is like its gone in limp mode. Firing on 2 or 3 cylinders. Then it clears itself and all good. Give it another 10 mins and it goes again.

So changed the plugs it fired up instantly on all 4. Took it down the road give it a bit of welly all good. Turning in my drive its gone again, I let the engine cool down popped the plugs out they all looked ok put them back in along with a set of coil packs just in case and it fires up no problem. 5 mins running and it does it again. :confused: Now its getting dark so will have another look when I get home from work.

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.
 

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I'd check the injectors, when it starts misfiring, unplug an injector at a time to find out which injector it is. Then change that injector over with a different one and see if its the injector or the wiring? That's what I'd do
 

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Discussion Starter · #5 ·
That was my next port of call, I hate problems like this.

Thanks for the advice :smthumbup
 

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Discussion Starter · #6 ·
I have heard of injectors going off after 15-20 min of working fine.. so if you are checking them, have someone do a long test..
That seems to be whats happening, it started last week very intermittently
and has got worse. It may pay me to put another set of injectors in it that I know work. Only trouble is they would be 560's and I'm running 750's.
 

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Discussion Starter · #7 ·
Ok went home fired it up and its missing badly, so took the plugs out had a look and 1 & 4 were wet. Cleaned them off, stuck them back in and fired it up. Running on all 4 as normal :confused:

Left it running to get up to temperature, turned it off restarted perfectly. ?

Didn't get time to take it for a blast as was helping my son put the front end back on the black one. So when I get home tonight I'll see what happens.
 

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Sounds to me Colin like the injectors aren't spraying right? If the plugs are wet? I'm only guessing but I've seen a good few threads about RC's having a **** spray pattern?
 

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Surely if the plugs are wet it means they're not getting a spark? Ad in light of the intermittent nature of the issue I'd be wondering is the problem was in the ecu or connections on the ignition circuitry.
 

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Discussion Starter · #10 ·
Sounds to me Colin like the injectors aren't spraying right? If the plugs are wet? I'm only guessing but I've seen a good few threads about RC's having a **** spray pattern?
You could be right Steve, only thing I can think is that 2 of the injectors are at some point dumping too much fuel in :confused: It can't be the spark breaking down as every time I pull the plugs and turn it over they are sparking perfectly. TBH I havent a clue why it doing it, I've ordered an OBD reader so I will have a look if there are fault codes.......Pain up the arris :wallbang:
 

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Discussion Starter · #11 ·
Surely if the plugs are wet it means they're not getting a spark? Ad in light of the intermittent nature of the issue I'd be wondering is the problem was in the ecu or connections on the ignition circuitry.
It was plugs 1 & 4 wet, yet when you put them back in it starts straight up running on all 4 ?

There's deffo a spark on all plugs, unless two are breaking down? But they are brand new NGK plugs, plus I've changed all the coil packs to one's I definitely know are ok.

I think I'll pull the injectors and get them tested, a process of elimination I suppose.:shake:
 

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Gary at APT does flow testing and cleaning. I think it was him who said RC didn't have the best spray pattern? I was going to ask about an OBD reader !
 

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Discussion Starter · #14 ·
Check plugs are gapped correctly.
Check leads are good and fixed correctly.
Check coil packs are good and fixed properly.
They are, checked them mutiple times. The spark side seems all good.
 

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Discussion Starter · #15 ·
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.:wallbang:
 

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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.:wallbang:
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 :lol: :smthumbup
 

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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 :lol: ) 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
 

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Discussion Starter · #18 ·
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 :lol: :smthumbup
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 :confused:

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 :smthumbup
 

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Discussion Starter · #19 ·
4 coils? so is this an evo engine with COP conversion?

thinking out loud (so maybe wrong :lol: ) 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 :D
 

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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 :confused:

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 :smthumbup
I'd try the cam sensor first, 30 second job to do as you've got access to one :smthumbup

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! :D

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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