2002 F4i Engine Very Lumpy Up to 3000 Revs

Reply Subscribe

Thread Tools

Search this Thread

#11

04-27-2019, 08:45 AM

74demon

Administrator and MVN, March 2012/Oct 2013 ROTM

Join Date: Sep 2011

Location: socal 949/951

Posts: 12,193

Likes: 1

Received 117 Likes on 107 Posts

Looks more like some oil residue that wss in your coil boot. You want them to be fairly clean, but i don't think that's bad enough to cause an issue.

Reply Like

#12

04-27-2019, 09:28 AM

Melvyn

Junior Member

Thread Starter

Join Date: Apr 2019

Posts: 13

Likes: 0

Received 0 Likes on 0 Posts

Quote:

Originally Posted by CaBaRet

Hi matey , where did you buy the plugs from as there is a large supply of fake plugs around,check this out against your plug just in case
https://www.slideshare.net/athangal/...ngk-spark-plug

Thanks for the tip. They were from Dave Silver (reputable Honda parts dealer) but I'll check.

Reply Like

#13

04-27-2019, 09:32 AM

Melvyn

Junior Member

Thread Starter

Join Date: Apr 2019

Posts: 13

Likes: 0

Received 0 Likes on 0 Posts

Quote:

Originally Posted by 74demon

Looks more like some oil residue that wss in your coil boot.

There was a tiny blob of oil in the bottom of the plug well (from a weeping rocker cover bolt) but not inside the coil boot that I could see. I'll keep an eye on it though. Thanks.

Reply Like

#14

04-27-2019, 09:37 AM

Melvyn

Junior Member

Thread Starter

Join Date: Apr 2019

Posts: 13

Likes: 0

Received 0 Likes on 0 Posts

The dodgy plug and coil were in pot #1 and the downpipe on that pot was running about 20° cooler than he other three so I've swapped the plug and coil to another pot to see if the cooler pipe moves with it.
I'm child minding 3 grandkids today so it will have to wait until tomorrow before I can finish re-assembling the bike to test.

Reply Like

#15

04-27-2019, 09:42 AM

Melvyn

Junior Member

Thread Starter

Join Date: Apr 2019

Posts: 13

Likes: 0

Received 0 Likes on 0 Posts

Quote:

Originally Posted by Melvyn

Thanks for the 'codes' tip CaBaRet - I'd completely forgotten about that feature. I checked and there were four - but as I've been unplugging stuff over the last few days while investigating the problem I can't be sure some of those aren't self-inflicted so I've reset the fault code memory this evening and we'll see what's there after a blag round tomorrow.

I cleared the codes and went for a blag round. It was still running rough as chuff at low revs. Re-checked the fault codes - none showing.

Reply Like

#16

04-27-2019, 11:13 AM

74demon

Administrator and MVN, March 2012/Oct 2013 ROTM

Join Date: Sep 2011

Location: socal 949/951

Posts: 12,193

Likes: 1

Received 117 Likes on 107 Posts

Did you get your MAP sensor vacuum line and IAT sensor plugged back in?

Reply Like

#17

04-27-2019, 01:43 PM

Melvyn

Junior Member

Thread Starter

Join Date: Apr 2019

Posts: 13

Likes: 0

Received 0 Likes on 0 Posts

Quote:

Originally Posted by 74demon

Did you get your MAP sensor vacuum line and IAT sensor plugged back in?

Yes thanks. I'd had to unplug them both to get the airbox off to get at the plugs and coils. I guess turning the ignition on with them unplugged registered them as faulty with the ECU.

Reply Like

#18

04-29-2019, 02:48 PM

Melvyn

Junior Member

Thread Starter

Join Date: Apr 2019

Posts: 13

Likes: 0

Received 0 Likes on 0 Posts

I've replaced the plug with track marks on it with a new one. Waiting for a used stick coil off eBay now - £12. Hope it's OK. Brand new ones are £86 each!

Reply Like

#19

05-05-2019, 03:26 PM

Melvyn

Junior Member

Thread Starter

Join Date: Apr 2019

Posts: 13

Likes: 0

Received 0 Likes on 0 Posts

FItted the £12 second hand coil stick and went for a 50 mile blag round today. It's running sweet as a nut! Touch wood, it looks like it's fixed.

And thanks for the tips and pointers guys.

Reply Like

#20

05-05-2019, 06:40 PM

Doc Samson

Welcome crew

Join Date: May 2018

Location: Winchester, VA

Posts: 918

Likes: 513

Received 212 Likes on 191 Posts

Quote:

Originally Posted by Melvyn

FItted the £12 second hand coil stick and went for a 50 mile blag round today. It's running sweet as a nut! Touch wood, it looks like it's fixed.

And thanks for the tips and pointers guys.

Even though I couldn't help, I'm glad to hear you found (and fixed!) the problem!

Reply Like