A couple of weeks ago my XR2 started surging during light accel but would take off once boost got up over 7.
The problem progressively got worse. Everything tested fine with fuel and ignition systems.
Decided to do a compression test.
Cyl
1: 117 psi
2: 137 psi
3: 135 psi
4: 135 psi
Number 1 low. Repeated the test on Cyl 1 after adding some oil to the cylinder. Same results.
Did a leakdown test. Could feel and hear air escaping from the tailpipe. Pulled valve cover. Cylinder 1 exhaust valve 2 is leaking. I can pry up under the spring retainer and the air leak sound changes.
So today I pulled the head and will drop it off tomorrow at the machine shop for a valve job.
Cylinders look good. Still can see crosshatch pattern on the cylinder walls.
I was lucky to find a complete head set. Fel Pro HS9691pt2. Got a steal on Ama*on. I ordered the set for $32.01. Must have been an incorrect price entry as a few hours later I found the price had gone up to $178.66. But they fulfilled the order for the price I paid.
I will post more info as the job progresses.