RPM dipping after revving the engine

**reynan29** · November 14th, 2014 11:36 PM

Hi, I have a Honda Civic 99.
help naman po, bumababa kasi yung RPM nya after mag rev
ito po yung sample video nya.

https://www.youtube.com/watch?v=l0dn...ature=youtu.be

Already did the following:
*replaced the IACV
*replaced the spark plugs
*cleaned the throttle body
*tuned up the engine
*changed the oil

**jick.cejoco** · November 15th, 2014 06:06 AM

Check your throttle position sensor. The episode on your video clip is too short but it seems to be hunting, a symptom caused by a bad TPS

**reynan29** · November 16th, 2014 12:32 AM

Originally Posted by jick.cejoco

Check your throttle position sensor. The episode on your video clip is too short but it seems to be hunting, a symptom caused by a bad TPS

hi, ano po ang gagawin ko sa tps? posible kaya na ito din ang reason kung bakit medyo matakaw sa gas itong oto ko? salamat!

**jick.cejoco** · November 16th, 2014 03:36 PM

Originally Posted by reynan29

hi, ano po ang gagawin ko sa tps? posible kaya na ito din ang reason kung bakit medyo matakaw sa gas itong oto ko? salamat!

The best test is using a DSO (digital storage oscilloscope) connected to the signal wire and ground. Make a sweep from closed throttle to WOT (wide open throttle). If glitches show on the waveform, the TPS is bad