need some di-electric grease in the spark plug boot,... maybe

 

Everyone's about covered all of the bases. Don't ignore the fuel filter even thought the MAP sensor is probably most likely of the choices. But remember, they are all good suggestions.

 

Sondra,

Is the jury in? Do we know the verdict? The suspense is killing us all.

 

Great suggestions but bet it is the MAP. They are easy to replace and are readily available. I noticed that the S2000 uses the same one as my son's '96 Accord.

You may want to temporarily swap one from another Honda and see what happens. Only a 5 minute exercise.

 

[QUOTE]Originally posted by heli
[B]

 

First the S2000 does not have a PCM it has an ECU; and yes there is a difference. Second a flashing check engine light is not "a very bad sign"; unless you consider an upcoming oil change a major problem. Thirdly are you referring to resetting STFT or LTFT when you suggest an O2 sensor problem with fuel trim.....just curious?

 

It was the MAP... quick fix, 36 hours in the shop!

 

PCM (powertrain control module) is the generic OBDII term for , "Processor", "ECU", "ECM"," SMEC", ect ect.

Maybe we have a misunderstanding. I refer to any OBDII "MIL" (malfunction indicator light) light as a check engine light, on our car it is the yellow "check" light inside the engine symbol. I believe you are thinking of the "maint required" light. Yes a blinking yellow"check"light is bad news. A blinking "maint" light is not.

ALL OBDII cars are required to have misfire detection and warning to hopefully avoid catalytic converter damage. The warning is the blinking light. OBD1 cars don't have this feature.


Ok, short term and long term fuel trim are both reset when the PCM looses keep alive power for a certain amount of time. If your car runs good in "open loop" and initial fuel control, something must be be driving the fuel system lean (most likely lean IMHO).

The Map sensor, TP sensor, and crank sensor are all primary sensors, any problems with these sensors would not be affected by "resetting the ECU". The problem would immediately return. A oxygen sensor induced fuel trim (long term and/short term)problem would not return until the oxygen sensor had come up to operating temp and the system had been in closed loop long enough under the right operating conditions to enact a radical trim change.

Another possibility is that the fuel trim is right on but the car has a slight secondary ignition problem. When the trims are reset the car tends to run richer for awhile. A slightly rich condition places less load on the ignition system which could temporarily "correct" a secondary misfire.

hope this helps clear up things.

I am, by the way, a ASE Master/L1 Driveability Tech.

 

Thanks for the insight and sorry to others for my misunderstanding. I incorrectly assumed we were talking Maint. Req. as opposed to Check engine. My mistake.

As it appears you too understand the system; should the OBD-II have posted a P0301-P0304 misfire code in your opinion?

 

[QUOTE]Originally posted by Utah S2K
[B]Thanks for the insight and sorry to others for my misunderstanding. I incorrectly assumed we were talking Maint. Req. as opposed to Check engine. My mistake.