R400 Duratec Missfire!?!

[R400PM]

Just got back from a drive and I have a missfire..

Got in the car around 7pm, got car warmed up (all fine), gave it some (fine) then poodled along in traffic for 5 miles and the next time I gave it throttle it seemed to hold back for a few seconds, then go but didn't seem to give it's all!?!

Driving around town it's spot on and you wouldn't know there was anything untoward. As soon as you put the throttle down it doesn't like it!?

Any ideas guys!? It was only serviced recently

[spiderlane]

http://blatchat.com/t.asp?id=200756

Any use? I have a Duratec R400 and after reading that did some investigation. Mine hadn't chafed any wires under the cover but I did some preventative maintenance just in case

Cheers
Mark.

[David Long]

I think the R400D does have a reputation for being hesitant at times - mine certainly gives problems after restarting from warm (and sometimes when warming up). I've put it down to the map but it does have all the hallmarks of vaporisation in the fuel rail (if that is possible). I've always thought having no return is not a good idea.

[R400PM]

spiderlane said:

http://blatchat.com/t.asp?id=200756

Any use? I have a Duratec R400 and after reading that did some investigation. Mine hadn't chafed any wires under the cover but I did some preventative maintenance just in case

Cheers
Mark.

I had a very quick look last night but the next time I'll get around to it will be Thursday next week I did think it might be a connection of some sort..

Surely it must be something relatively simple. It was driving fine on Monday and it was fine up until 10 miles into the journey last night.

Cheers

Paul

[R400PM]

David Long said:

I think the R400D does have a reputation for being hesitant at times - mine certainly gives problems after restarting from warm (and sometimes when warming up). I've put it down to the map but it does have all the hallmarks of vaporisation in the fuel rail (if that is possible). I've always thought having no return is not a good idea.

It starts and idles fine, even driving around town you'd not know there was anything wrong. It's only when you press the loud pedal it starts to hesitate and splutter, then it clears (nearly) and gets going!?!

Sadly I am not mechanically (or electrically) minded so unless it's something visably obvious I don't stand a chance!

Cheers

Paul

[Sevdoc]

I've been through three distinct problems with misfires in my 2007 R400 Duratec.
First was a sudden coil pack failure- bizzarely different to the other 3 and labelled as a test item- easy swap.
The next was a broken trigger wire to a coil packs, easy to spot, cured with new engine loom under warranty.
Finally, more misfiring and, after much fiddling, cured with new sub-loom incorporating those pesky trigger wires again. They seem susceptible to vibration damage and fracture- misfire worsens as engine and insulation warms up.
A well recognised problem- worth chat with CC if you don't have the upgraded loom; may be your problem?
Neil

[R400PM]

Sevdoc said:

I've been through three distinct problems with misfires in my 2007 R400 Duratec.
First was a sudden coil pack failure- bizzarely different to the other 3 and labelled as a test item- easy swap.
The next was a broken trigger wire to a coil packs, easy to spot, cured with new engine loom under warranty.
Finally, more misfiring and, after much fiddling, cured with new sub-loom incorporating those pesky trigger wires again. They seem susceptible to vibration damage and fracture- misfire worsens as engine and insulation warms up.
A well recognised problem- worth chat with CC if you don't have the upgraded loom; may be your problem?
Neil

Thanks Neil

I've emailed CC to see what they can suggest too. Next time I get five minutes I'll have a poke around to see if I can see anything obvious. I am desperately trying to avoid having to get the car back into CC as it's a good 3/4 hours round trip which I could easily do without.

Paul

[MikeGF]

Paul

Sorry to hear that, it was running so well at RAF Odiham the other week.

I had a similar problem in the Superlight, and it turned out to be the HT lead shorting out at the spark plug, changing the leads and plugs sorted it, maybe worth a try? Pretty damn similar symptoms..

Hope to see you out and about soon mate.
Cheers
MikeGF

[R400PM]

MikeGF said:

Paul

Sorry to hear that, it was running so well at RAF Odiham the other week.

I had a similar problem in the Superlight, and it turned out to be the HT lead shorting out at the spark plug, changing the leads and plugs sorted it, maybe worth a try? Pretty damn similar symptoms..

Hope to see you out and about soon mate.
Cheers
MikeGF

Hi Mike,

I might have to tempt you round with a cold beer to have a look!? I don't know my arse from my elbow when it comes to engines!

Regards

Paul

[MikeGF]

Ha ha ha, me neither mate, it was my mate Ian who fixed it for me, he was also at Odiham in the green Caterham with the VX engine in it, think he went up against you?

He knows his stuff with cars!! I can see if he can help??

Cheers
Mike

[R400PM]

MikeGF said:

Ha ha ha, me neither mate, it was my mate Ian who fixed it for me, he was also at Odiham in the green Caterham with the VX engine in it, think he went up against you?

He knows his stuff with cars!! I can see if he can help??

Cheers
Mike

All sorted! I fixed it all myself I did!

It was a wire leading up to number 4 coil worn through and shorting out against the rocker cover bolt. The hole in the wire was no bigger than the tip of a biro, so lucky to have spotted it!

I wrapped it in some electrical tape and Roberts your Mothers Brother, she's back to normal!

Thanks for anyone who pointed me in the right direction!

Regards

Paul

[MikeGF]

Well done Paul

I'll keep a look out for you this weekend mate!

Cheers
MikeGF