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Discussion Starter #1
Hello! I thought I would never have to make a post like this, I bought a nice low ish milage 2008 p8f in green, service history etc. Its had valve check recently by the previous owner, not a great garage as they didn't put a new valve gasket on, so it's leaking oil. They also had left the airbox connector to the throttle body clip loose on one side so there was air getting in past the filter. Anyway, I cleaned the air filter, and as it was running quite rough at idle I replaced the plugs, thinking it just needed some tlc and it would run fine.

New iridium plugs made no difference.

Ive tested all four coils with my multimeter, all within spec of the range stated in the manual. Coil no 1 is a spare I got off ebay. 2-5 are what are currently on the bike...

I don't know what else to try.

It's got a yoshi end can and kn air filter. Stock apart from that!

Symptoms are, seems to run almost on Three cylinders at idle and when no throttle, so if your going downhill with no throttle it's misfiring pretty much constantly. Anytime you go to no throttle or very little throttle, say around town, its missing. You have to whack the throttle on and after a second or so it gets above about 2k and its fine all the way to redline.

Fuel pump seems to work fine as you can hear it prime when you turn the bike on...

I've ran wynns injector cleaner through it, no change.

What else can I try<img src="http://zx6r.com/images/smilies/rock.gif" border="0" alt="" title="Eh?" class="inlineimg" />

Please help =(
 

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Have you figured out which cylinder isn't firing?

Start there. . Either squirt some water on the headers and look for the one that evaprates slowest, or if ya have a nifty laser thermometer :bigthumb:

Once you've nailed down which cylinder, try swapping the coil with one that's already in the bike and see if you get the misfire on the same cylinder.

If you do... I'd start checking connections and wiring, and test the injectors on that cylinder. If the misfire follows the coil you swapped, then you've got a bad coil.
 

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SO you left out header temps. Those should say if it's one or all not firing correctly.

You basically said the shop had NO F'in idea what they are doing so you did pull the air box and confirm all the hoses are correctly connected and you don't have any vacuum lines left off.

ALSO you mentioned the great garage that left the bike in this condition checked the valves.
DID THEY. Are they correct, saying lowish miles as in 25,000 miles?

If this was mine, I would order a new valve cover and plug seals after checking the valves.
Those are due at what 18,000 miles? Once I knew no shims are needed order the gaskets ETC.
While your waiting, pull the plugs. Check them, how do they look. All the same.
One black, fouled?
 

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Stuff can test good and still be bad btw. It happens all of the time. My race boat had a bad coil that tested good. Tried to tune it out or find what else it could be forever. Finally put in a new coil, boom, good to go.
 

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Discussion Starter #5
It's got 16700 miles on, valves done at 15500. I will get a lazer thermometer tomorrow, but usually when it's misfiring g your going downhill, so fuel will be shut off in the injectors at no throttle right?

How can I test the injectors?

I think you are correct, first I will try nail down which cylinder it is, then try swap the coil.

I have ordered a new valve gasket as its leaking, but the main issue is the misfire.

I read online that this year run rough with a non stock exhaust but surely not this bad. Lots of my other zx6rs have run fine on a race exhaust.

Cheers!
 

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Discussion Starter #6
Ps, if the garage who did the valve check had fucked up when they put the cam chain back on, say put it back incorrectly, what would the symptoms be?
 

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Ps, if the garage who did the valve check had fucked up when they put the cam chain back on, say put it back incorrectly, what would the symptoms be?


Depends on how bad the cams are misaligned. My bike actually had 180° misaligned cams (after a shop did the valve job) that held the inlet valves open at the wrong time giving me almost no vacuum at certain times giving me awful throttle response and engine running a bit weird.
I would assume that if the cams are placed 1- a few tooths Off it would Probably be running weird, and Worst case your valves could be hitting the pistons. If it was running fine before the valve job, I would look into that as a possible issue.
 

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Look at the header connections to the block. If one of the clamps are loose, that will have major impact.
 

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Ps, if the garage who did the valve check had fucked up when they put the cam chain back on, say put it back incorrectly, what would the symptoms be?
So you picked it up from the shop running like this? Or was it running fine one day then miss firing the next?

If it was timed wrong it would have run like that since leaving the shop and any shop worth their salt wouldn't even call the customer knowing it ran like shit and something wasn't right.
 

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It's got 16700 miles on, valves done at 15500. I will get a lazer thermometer tomorrow, but usually when it's misfiring g your going downhill, so fuel will be shut off in the injectors at no throttle right?

How can I test the injectors?

I think you are correct, first I will try nail down which cylinder it is, then try swap the coil.

I have ordered a new valve gasket as its leaking, but the main issue is the misfire.

I read online that this year run rough with a non stock exhaust but surely not this bad. Lots of my other zx6rs have run fine on a race exhaust.

Cheers!
I have a 2008 zx6r with 17,000 miles and have a full headers back two brothers exhaust that purrs like a lion. No pop or crackling, sounds amazing.
 
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