Hesitation at low revs... :(

[SwissVFR]

[Smeagol]

How violent is it?

Is your chain adjusted correctly?  At light loads if the chain is a bit slack it can whip around a bit and give some jerkiness.

It won't be the VTEC that doesn't come in till 6800ish revs it has no effect below that.

Plugs and HT side I would expect to play up more when loaded up, not with light throttle, if there is a fault.

Fuel supply again I would expect to be when you want it to supply more, under heavier load.

Let us know what the dealer finds, get them to test ride and confirm they can feel the effect you do.

[Smeagol]

Just had another thought 

Contaminated fuel, did it start after a fill up?

[SwissVFR]

Originally Posted by Smeagol

How violent is it?

Is your chain adjusted correctly?  At light loads if the chain is a bit slack it can whip around a bit and give some jerkiness.

It's pretty noticeable.  The chain was the dealer's first thought as well, but he suggested it might be too tight.     I checked and it seems within specs...

--sv

[SwissVFR]

Originally Posted by Smeagol

Just had another thought 

Contaminated fuel, did it start after a fill up?

That was one of my thoughts as well, I'm only on my second tank here, the first was the initial fillup from the dealer...  I ran it down well into reserve, then filled up, no change, so I guess it's not that.

--sv

[Smeagol]

Without testing the fuel, or completely draining the system, it still might be the fuel.  Sometimes contaminants can sit in the bottom of the tank and get into the lines.  Contaminants can also block the fuel filter or damage the Lambda sensor, famous case of supermarket petrol contaminated with silicon which was claimed damaged the lambda sensor and caused poor running.

[Shaunomercy]

id say fuel.  run that through and then fill up with some 98 ron premium fuel.
only other questions i have for you are
1 is engine getting upto temp ?
2 are you giving it the beans when engine temp below 68 ? vtec wont operate

paul

[Smeagol]

Originally Posted by SwissVFR

I am having a distinct problem at low revs and light loads - around 4K rpm

Not a VTEC problem Paul, the issue is well below VTEC operating revs.

[sregdor]

I have also had this happen to me . What I boiled it down to was maybe a flat spot in the fueling to help with emissions. Could be completely wrong though.

[Shaunomercy]

Originally Posted by Smeagol

Not a VTEC problem Paul, the issue is well below VTEC operating revs.

no i know that mate.  my point was the engine not being upto full operating temperature.
ive never noticed any hesitancy with mine but i generally let it idle n warm up thoroughly.
id say put some premium fuel through.  if its still hesitates, back to supplying dealer and ask them to sort it and balance the starter valves as that makes a big difference to the vtec lump.
paul