main relay buzzing with s300

holset b18c1 · Post by **holset b18c1** » Tue Jul 28, 2009 2:07 pm

not sure whats the problem but my main relay started buzzing the same day after i tryed 2 get the car tuned?? i checked for loose gound wire found none!! thromostat valve cover tranny grounds all good!! looked in the car for loose grounds none!! tryed cranking the motor will not start any more is my s300 fired??also only with the s300 the relay buzz not with the stock ecu!! car 99 civic si with gsr turbo set up!!

Post by **Spunkster** » Tue Jul 28, 2009 2:42 pm

Try the ECU in a known good OBD1 car. It may be your adapter harness.

holset b18c1 · Post by **holset b18c1** » Tue Jul 28, 2009 2:52 pm

ok i guess i will have 2 do that but i got a next relay, just in case!! also thanks for the info

kinetics · Post by **kinetics** » Tue Aug 04, 2009 7:05 am

I had this issue when I had a bad ground.

holset b18c1 · Post by **holset b18c1** » Tue Aug 04, 2009 9:21 am

Where was your bad ground wire?
Got a new jumper harness and main relay ! Still buzzing

Post by **Spunkster** » Tue Aug 04, 2009 10:18 am

What is the battery voltage when cranking?

kinetics · Post by **kinetics** » Tue Aug 04, 2009 10:57 am

My bad ground was actually on the neg battery cable, between the fender wall, and the block.
So, basically, it was missing the block ground. It started 1 time, and then started doing the buzzing from then out, and wouldn't start.

Hondata

main relay buzzing with s300

main relay buzzing with s300

need help