Rep Power: 0

'90 Civic EX with D16A6. Just got it running well, and ran it out to a buddy's house the other day. Ran the 20 minutes on the freeway to his house and now it's running rough again at idle. Able to drive it home. Checked compression, and #2 has zero. Took off the valve cover, and cranked it over. Valves all seemed to be opening and closing fine from what I could see. Oil is clean, and there is no white smoke blowing from the tailpipe. Anyone have any suggestions? I'm getting ready to go tear it down now

 
Rep Power: 813

any coolant being burned off? you can still have headgasket leak without white smoke. if you are burning coolant and its not dripping anywhere, chances are headgasket has a small leak. if you tear the head off, be sure to get it tested for compression, cleaned up, and milled if the surface is warped. machine shop can do it all for around $100. that way you know you are putting in a working head.

 
Rep Power: 0

Head gasket turned out to be fine. #2 had a chunk missing from one of the exhaust valves. Must have gone out with the exhaust because it's not in the cylinder. Anybody know if I need new head bolts when I rebuild? I know some imports required them. not sure on this one as I have not received my manual from Helm yet. Thanks

 
Rep Power: 813

yeah you always need new bolts. and theres a very specific multi-step tightening procedure and order. should be in the manual youre getting.