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[cruisetopoland]

Just changed them outside in my suit (!)

Rocker cover was (supposed to be*) changed when I bought car, along with plugs etc.

First sign was faltering, so last weekend Welung666 and I had it to pieces and found the DIS boots in tatters (*can't have gone this bad since Oct) and the plugs oily.

Cleaned out what we could, changed the rocker cover gasket again with a new one, cleaned top of plugs, fitted a VX OE DIS boots/springs/washer kit.  Still poor and 23mpg.

Just had plugs out-undid very easily and looked recent, but were oily on top and on thread-likley to be residue oil running down thread when undone.  Electrode looked normal.

New plugs in after thorough clean and oil leak check, started fine, still feels sluggish.

Pulls ok at tickover, very slightly hesitant 2500-4000 revs, noticeable power increase at 4000.  25mpg.

Spoke to welung666 again-no fault codes on my "My Naff Code Reader", wondering if it is the cat or a sensor somewhere.

For the love of God, when will this end  :-/

[Dave DND]

For the love of God, when will this end   

When you sell it   

[Dave DND]

wondering if it is the cat or a sensor somewhere

Would it be worth checking emmissions on a gas analyser?

 :-/

[cruisetopoland]

For the love of God, when will this end   

When you sell it   

  you great big ray of hope you 

[cruisetopoland]

wondering if it is the cat or a sensor somewhere

Would it be worth checking emmissions on a gas analyser?

 :-/

What would this tell me?

[Kevin Wood]

Pulls ok at tickover, very slightly hesitant 2500-4000 revs, noticeable power increase at 4000.  25mpg.

Spoke to welung666 again-no fault codes on my "My Naff Code Reader", wondering if it is the cat or a sensor somewhere.

For the love of God, when will this end  :-/

If you have access to an "My Naff Code Reader", have a look at the live data.

Interesting values:

Intake air volume from the MAF at idle and fast idle (2500 RPM). Typically, this figure is about 12kg/h at idle when hot. Can't remember at fast idle but probably low 20's.

Fuel trims (can't remember what this engine reports, probably long and short term). Try and get a look at what these are doing when you're driving in the "flat spot" region. Typical values would be around 0%. More than about +/-10% and I would perhaps be concerned.

Have a look to see if the O2 loop is showing "closed" while you're doing this.

Also, check the obvious parameters (intake air temperature, coolant temperature, battery voltage) and make sure they are plausible. In fact, get a couple of dumps and post them here.

Maybe we will be able to spot something.

Kevin

[cruisetopoland]

Pulls ok at tickover, very slightly hesitant 2500-4000 revs, noticeable power increase at 4000.  25mpg.

Spoke to welung666 again-no fault codes on my "My Naff Code Reader", wondering if it is the cat or a sensor somewhere.

For the love of God, when will this end  :-/

If you have access to an "My Naff Code Reader", have a look at the live data.

Interesting values:

Intake air volume from the MAF at idle and fast idle (2500 RPM). Typically, this figure is about 12kg/h at idle when hot. Can't remember at fast idle but probably low 20's.

Fuel trims (can't remember what this engine reports, probably long and short term). Try and get a look at what these are doing when you're driving in the "flat spot" region. Typical values would be around 0%. More than about +/-10% and I would perhaps be concerned.

Have a look to see if the O2 loop is showing "closed" while you're doing this.

Also, check the obvious parameters (intake air temperature, coolant temperature, battery voltage) and make sure they are plausible. In fact, get a couple of dumps and post them here.

Maybe we will be able to spot something.

Kevin

Will do, cheers 
Had hooked it up earlier today, all figures constantly changing, O2 loop closed, coolant 82, no idea what rest of the figures meant  :-?

[Dave DND]

wondering if it is the cat or a sensor somewhere

Would it be worth checking emmissions on a gas analyser?

 :-/

What would this tell me?

the hesitancy on my Buggy was an exhaust fault, that showed up when on a gas analyser - I was clutching at straws then, and not sure if it was the machine or operator that found the offending hole though

 :-/

[cruisetopoland]

wondering if it is the cat or a sensor somewhere

Would it be worth checking emmissions on a gas analyser?

 :-/

What would this tell me?

the hesitancy on my Buggy was an exhaust fault, that showed up when on a gas analyser - I was clutching at straws then, and not sure if it was the machine or operator that found the offending hole though

 :-/

Well, it has had a new manifold gasket, new studs, (s/h) cat and new three-part exhaust-all leak free, finally..

It does feel like an exhaust thing to me though-welung is looking at perhaps changing the cat again

[cruisetopoland]

Well only 18mpg today so I've had the new plugs out again and had another clean out of the thread/seat to clear the very last of the old residual oil (former rocker cover leak), disassembled the new DIS rubbers and springs again, plus tightened the plugs up again-harder this time.

http://www.hayabusa.org/forum/attachments/maintenance-do-yourself/116966d1223649221-spark-plug-condition-reference-pics-scan10001_edited.jpg

On the guide above, mine are in same condition as the top left picture.

I'll try on the way home and see how it does  :-/

Tired of this-should be 30mpg+ like before...