sugarcron

Hey guys, I recently picked up a 2002 Accord automatic with 127k on the clock as a project. It came with a blown head gasket. I broke the engine down, had the head machined, changed the piston rings, did a valve job, spark plugs, ignition wires, distributor, new intake manifold, throttle body, all associated sensors,the works.

So everything is put together, timing marks triple checked, turn the key to the on position; the radiator and a/c condenser fan come on as well as the MIL with the DTC P1259 for oil pressure to the VTEC solenoid. Seeing as the DTC was set before the engine was run instantly made me think electrical issue. I cranked her up and she came to life! Awesome! After preforming the ECM/PCM procedure I give her a little bit of gas and she began to stall and sputter, as if it wasn't getting enough fuel. I gave her a bit more fuel and she moved past it and ran smoothly up to 3000 RPM where the RPMs would begin to drop sequentially every few seconds, above 3000 RPM = Stall.

Ran a compression tests, all cylinders hold compression.

So I began testing the VTEC Solenoid for an electrical issue. Pressure switch has continuity, voltage, ground, the solenoid valve connector has continuity. There's about 7psi of oil pressure going to the solenoid, and the oil screen is clean. I even swapped it out with a known good one a friend had to no avail.

After testing the VTEC solenoid I began to suspect that perhaps the piston for the rocker arms might have the VTEC stuck open. They move freely. Tested fuel pressure to be approximately 53PSI. I swapped the fan relays with known good relays and the fans still act the same. One thing that I also noticed is that at 700 RPM the ignition timing is at -10 degrees where as it should be at about 10 degrees. At 3000 RPM it reads 27 degrees. which is what led me to believe the ECM/PCM was at fault. I replaced the ECM/PCM with a known good one, reprogrammed my key, turned the key to On, MIL, DTC P1259. It still runs like crap.

So at this point I'm basically out of ideas. All I can think of is a short in the wiring harness somewhere, bad fuse box maybe. All I can say for sure is that the indicator just illuminated.

sugarcron

Bumpski

Raf99

Complicated issue as there are so many things involved here. Any error codes or check engine light?

Lost Again

What was the resistance of the one wire solenoid to groud with the key off?

sugarcron

Well, it turns out I had two sets of connectors backwards. The VTEC oil pressure switch was mixed with what I believe was the engines oil pressure sensor, which took care of the fan and VTEC P1259 issue.

The second set was a mix between the MAP and TPS sensors.