My 1996 Integra GS-R with a little over 200,000 miles recently had the head rebuilt by Innovative MotorWorks in Carlisle PA. The work was done in November by the previous owner and there has been less than 1,500 miles on the car since then. I know the previous owner fairly well and know he's not the kind of guy to mess with an engine (he paid for everything, has receipts to show the work and such).

The car runs well, doesn't hesitate and only occasionally is slow to start (starts on the 5th or 6th crank of the starter, nothing awful). The check engine light was on for the front O2 sensor (P0135), but a bunch of new codes appears all of a sudden:

P0155
P0303
P0304
P1399
P0135


It looks like cylinder three and four were misfiring on the occasion. I pulled the plugs, which were put in when the head was redone, and they had a white tint to them. I checked the oil and there wasn't any coolant in it, but I did discover one thing . . .

There is coolant leaking from between the head and the block where the headgasket tab appears. It wasn't much coolant, but you can definitely see it there. It doesn't appear to be leaking from the water tube. According to the receipts, a new OEM headgasket was used when the new head was re-freshened. The head gasket is installed the right way too since the serial is facing up.

So what are my next steps? A compression test to ensure all is good and then what? I have scheduled an appointment with the shop, but since I'm not the original owner, it will be all out of pocket.