Thanks for the info, it helped a lot. Do you happen to know the intake/exhaust seat widths after grinding and lapping?

Is that for both the intake and exhaust?

Does anyone know the specs on the height of the valve stem tip to the top of the valve guide to keep them in the range of the hydraulic lifters after grinding?

I still cannot get my 98 V70 to pass a smog test. The car runs fine down the road but during the smog test after sitting at high rpm the IAC begins oscillating and the idle speed surging. I thought it was a problem with the cooling fan because the fan doesn't seem to come on when it should but I've ...

I've done that and the fan and relay both seem to work fine. I've checked the wiring for continuity from the connectors back to the ECU and all seems to be fine. A driving test yesterday showed that the fan comes on intermittantly. when it runs as it should the car runs fine but when the fan does no...

If I'm reading the schematic correctly the ECU gives the high and low speed coils in the relay a ground to turn on the relay, is that right? I noticed that the box for the ECU has an upper and lower section, I assume that there are a number of electrical connections in the botton section since the s...

I’ve had a problem with my 1998 V70 surging at idle when warm. If I disconnect the IAC it runs fine but idles high. With some troubleshooting it appears the cooling fan is not turning at low speed, it does turn on high speed at about 217F but that’s right where it trips the check engine light. I als...

It sets P1505 and P 1507. I did a test awhile ago and found the coolant temp while driving regulates at about 198 F with the new thermostat. When I stop and idle the temp goes up to about 216 F, at that point it trips the CEL and starts the idle surging. If I let it cool down a bit I can reset the C...

I have a 1998 V70 GLT with 277k miles. The engine runs great and has 180 psi compression in all cylinders. It has a problem of the idle surging severely when completely warm. When starting cold with the check engine light cleared and the IAC plugged in it runs fine and all the OBD parameters are in ...