ok i have an obdI b18c1 in my civic si, i just had an obdII oil pump installed so i could pass emissions. before the new pump was installed the motor made no noise, now it makes a dry bearing noise when the motor is revved and at idle it makes a hydraulic pump noise on and off....the car still runs fine and the vtec works...the one thing that didnt get done was the lower timing belt cover the obdI one got re-used and i know that the obdII one is different ....any ideas? i really dont want to drive it anymore if there is a chance of it getting ruined....and the oil light does not come on, but i know it works.upon start-up it comes on but goes off like its supposed to.

 

sounds like maybe a lower timing belt cover rubbing... get a obd2 lower cover and you will be all set by the sounds of it...

 

how tight did ya make the timming belt?did you change the water pump also?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by godzillasilvia &raquo;</TD></TR><TR><TD CLASS="quote">ok i have an obdI b18c1 in my civic si, i just had an obdII oil pump installed so i could pass emissions. before the new pump was installed the motor made no noise, now it makes a dry bearing noise when the motor is revved and at idle it makes a hydraulic pump noise on and off....the car still runs fine and the vtec works...the one thing that didnt get done was the lower timing belt cover the obdI one got re-used and i know that the obdII one is different ....any ideas? i really dont want to drive it anymore if there is a chance of it getting ruined....and the oil light does not come on, but i know it works.upon start-up it comes on but goes off like its supposed to.</TD></TR></TABLE>

I would start by checking out the timing belt and the covers.

then start checking the tensioner

I didn't know that the oil pump would effect your emissions.....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Crazydave &raquo;</TD></TR><TR><TD CLASS="quote">

I didn't know that the oil pump would effect your emissions.....</TD></TR></TABLE> it does when it throws a crank sensor code, and here if it throws ANY code it fails automatically . obdI doesnt have the sensor obdII does

 

CKF sensor on the housing, OBD1 Honda's do not have this, it is mandatory sensor for accurate cylinder misfire detection, without it you fail.

You might have the belt on too tight. They like to whine really bad when they are over tightened. I had to relieve some spring tension on my 91 hatch just to get it to shut up. Water pump and tensioner should always be inspected, if not replaced. Makes sure the crank gear timing belt guide plates were installed with the bevel facing away from the belt.