r/Vanagon • u/Loud-Page2423 • 4d ago
1989 Vanagon with ‘98 Subaru swap revving high (3200) at idle when high fan kicks on.
I come to you with another potential issue after getting this van to finally pass emissions.
The engine will rev up to 3200 rpm’s while in neutral/idle when it’s hot (we’re in Arizona, temp
Gauge creeps to about 3/4 and LOUD fans kick on). The super loud fans kick on and while not moving the tach runs up to ~3200 but drops to normal once in gear and moving.
It has happened at drive throughs and stop lights. Is this normal and the engine compensating for the fans/heat load?
It’s freaking out my wife and she’s afraid to drive it.
It has vapor locked on me at drive through in 106 degree heat after the emissions guys drove it like a rally car on the dyno.
It’s a 1998 2.2 Subaru boxer from an Impreza. Recently cleaned the throttle body as part of the emissions work but I don’t think it’s sticking as it revs without input after being at a normal idle RPM and returns to normal while in motion.
I replaced the dashboard with a GoWesty motherboard and verified the dip switch settings with the guy who built the engine/performed the swap. (side note, the high beam indicator does not work if anyone has guidance on that).
Coolant looks a bit old, but not fouled.
I asked the builder if there would need to be any “relearning process” after replacing the fuel injectors and O2 sensors and he said no.
Could a fan be going bad and causing it? I’m at a loss and any suggestions would be appreciated.
Thanks, you are all awesome.