prs2000

Hi to all the great S2000 community, I am dealing with a problem on my 2000 S2000. At the moment I get hesitation from the engine while cruising speed at about 65+ MPH and about 3400 RPM. The problem is much more noticed in the afternoon hours than in the morning weird but I atribute this to lower air temp. in the mornings like at 4:30am or so VS 4:00pm. Now I have read many posts on this topic here on the forum but many conclude that injectors have resolved the issues but i am not totally convinced that this may be the case, here are some tests I have performed already. Injector balance test using a fuel gauge bringing fuel pressure to 35psi and pulsing the injector for .5 seconds the pressure drop was about 16psi on each of the injectors which lead me to believe that all four injectors discharge at the same flow rate.

Among the trouble codes I get P1399 along with all four missfire P300 etc... for all cylinders.

I must note that hesitation only ocurrs under load and miss fire may or may not be noticed at iddle.

Any help will be appreciated.

Thanks

philipxhuff

Product Update Campaign: S2000 Spark Plugs
BACKGROUND
Faulty spark plug gaskets can cause the spark plugs to
loosen. A loose spark plug can cause the engine to
misfire and the MIL to come on.
CUSTOMER NOTIFICATION
All owners of affected vehicles will be sent a
notification of this product update. An example of the
customer notification is at the end of this service
bulletin.
If any affected vehicles are in your new or used vehicle
inventory, repair them as described in this service
bulletin.
CORRECTIVE ACTION
Replace the spark plugs. Then, using the correction
labels included in the spark plug kit, update the spark
plug information in your customer