Hondata

i connect the cable to the laptop and it registers that it is there but it will only log for like a second or not at all ive updated my firmware and my usb drivers multipletimes. need help ive exausted all ideas.

ok. I've narrowed it down to something with the s300 itself. when the car is not running, i can datalog for as long as i want i can watch the tps and other readings on the display screen. but as soon as i start the car it will continue to datalog for maybe a minute and then stop. the usb stays connected and it stays online but it does not record any data. about a month ago i was able to datalog no problem. any suggestions on what to do?

i had the same problem and it was because somebody kicked my usb cable at the ecu and lifted up the s300 unit a little bit. i took the cover off, took the unit out and placed it back in and the problem went away. the only things it could be is the ECU socketing or the usb connection. i dont think there is anyting wrong with your s300. check out this thread, its great:

http://hondata.net/forum/viewtopic.php?t=5226

i checked the soldering on them and they looked ok to me and the board was down. i did not have this problem until just recently.

If the datalogging stops at a certain rpm the cause is electrical interference, usually originating from the ignition system. Check that the spark plugs are resistor type and that either the distributor cap has a resistor or plug leads are resistor type.
tht is the only thing i am unsure of, i know the cap is brand new and so are the spark plugs, they are ngks. thanks for the reply, much appreciated. any body else have ne ideas?

im thinking it has to be electrical interference. because it is fine when the car is not running. is there any way to tell? should i change my spark plug wires or something?

what is the p/n on the spark plugs?

im not sure but i know they are 8s and they are v power, i changed them just prior to this problem but they are the same plugs that i had in just b4 but new. im goin to put the ecu in a friends car later on to try and eliminate the ecu itself.

If they say race then they are non resistor.

ok thankyou i will check, but i think a friend of mine has the same plugs and his dattalogging works fine. im going to try a few things after work today and i will update later. all input is much appreciated.

I checked, they are not race plugs, thay are ngk R's - the v power plugs.

R's mean race, they are non-resistor.

lol figures, guessi shoulda thought of that one. i just put it in a freainds car and it worked fine. im going topick up new plugs. thankyou for the help.

actually, ngk r's are resistor plugs. what else could it be? straight off the ngk site:
A: NGK "R" or resistor spark plugs use a 5k ohm ceramic resistor in the spark plug to suppress ignition noise generated during sparking.

NGK strongly recommends using resistor spark plugs in any vehicle that uses on-board computer systems to monitor or control engine performance. This is because resistor spark plugs reduce electromagnetic interference with on-board electronics.

They are also recommended on any vehicle that has other on-board electronic systems such as engine-management computers, two-way radios, GPS systems, depth finders or whenever recommended by the manufacturer.

In fact, using a non-resistor plug in certain applications can actually cause the engine to suffer undesirable side effects such as an erratic idle, high-rpm misfire, engine run-on, power drop off at certain rpm levels and abnormal combustion.

http://www.ngksparkplugs.com/products/r ... country=US

These are non-resistor plugs

i do not have the racing plugs, i have the standard v power plugs.