Just had the head gasket replaced last month along with water pump, spark plugs, timing belt, hoses, thermostat, clutch, blah blah blah.

Before the engine work, car had VTEC and no bogging just the idle going up and down by about 200 rpms.

Afterwards (got back from Honda), car does hit VTEC at 5500rpms, and car stumbles and bogs from 2000-3000rpms. Once 3000rpms hit car accelerates fine.

The tech said the he had to adjust the timing because of the IACV is sticking, so now the car idles at 1200-1400rpms when warm. When AC is on idle is around 900-1000rpms.

What's going on? Is it the timing that is preventing VTEC switchover? And what could be causing my bogging between 2000-3000rpms?

 

grab a timing light & check it your self.

I bet the timing is off and then they compensated by adjusting the idle screw up. Just fix the timing and idle the car back down to 750-800 and see where that gets you.

if the iacv is indeed sticking.. pull it off and clean it with brake cleaner / re-install.

 

Can the clogged IACV cause the bogging problem?

 

woah there, the IACV was sticking so he adjusted the timing? calling that a half-assed attempt would be too kind. clean your IACV and reset your timing. your timing is probably retarded, like the guy who worked on it.
no but f-ed up timing will

 

agreed on timing issue. Make sure you short the SCS when you adjust the timing physically, or else it won't really do you any good.

 

You have to short the SCS even on the 93 Civic Si? I thought that was only done on OBDIIs and higher?

 

u don't have to short anything if the car is at operating temp.

 

for some reason I was still thinking about your 99 Si h:

correct

 

Yeah I miss my 00 Civic Si. It was my first NEW car, plus I babied her like a child I also miss just the sound of the B16A at full song. I could drive like that all the time, but piss off everyone else Someday I guess I'll buy another one just to pass down to my daughter. When I was your age this car was the one to have. I also thought about an AP2 in Suzuka Blue.