Pulsing vibration when idling

[cliffo]

have same problem with my 98 honda coupe. the vibration idling only happens every now and then. other problem is when i hit the clutch my RPM drop low and jump back up to regular idle. once rpm's go back then i get the vibration.

 

[JniG]

another good place to check too is make sure a Vacuum hose hasnt disconnected.. I Pulled the top end off my motor a while back and forgot to connect one of them back and it did the same kid of symptoms... Just a suggestion

Just checked. Vacuum hose is still connected.

have same problem with my 98 honda coupe. the vibration idling only happens every now and then. other problem is when i hit the clutch my RPM drop low and jump back up to regular idle. once rpm's go back then i get the vibration.

If you have a CEL then its probably the o2 sensor like mine. Otherwise might be bad motor mounts. i honestly have no idea lol. I'll have to replace my sensors to see if that fixes my problem...i really hope it does.

 

[JniG]

Replaced my o2 sensor, took out my throttle body and cleaned it the proper way. my goodness there was a thick layer of carbon buildup on that bich.. Car runs like a champ now and idle is smooooth. Thanks 619rcr for sugfesting it. Gonna do a whole seafoam routine before my next oil change also to clean out the rest of the internals

 

[619rcr]

Awesome, no problem. Glad to hear it.