Fan pulses on and off when trying to pull CEL codes 94 TW

[Brandon Clifton]

I have a 94 TW 4WD, with CAI / IC / Exh and am running ~13 psi with an MBC. Whenever it's wet outside the car throws a CEL from startup. It used to go away after ~20 mins of driving, but it threw one last week and it won't go off.

When the light is on the car hesitates up to ~3000 RPM at any boost level (not the sudden neck-snap like when you hit fuel cut, it feels more like when you're in a turbo FWD and digging for traction). The wideband stays around 14.0 - 14.3, but it's tuned so usually it drops to the low 13s by 3000 RPM. I'm running an Apex'i SAFC-II.

I finally got a spare minute last night and took the dash panel off to connect the neon-green plugs together to flash the trouble codes with the CEL, but when I connected them the radiator fans started to pulse on and off. I though "what the heck- maybe there's just some screwup in the wiring and the fans will pulse in the same 'long - short - short - etc' manner as the CEL." None such luck.

1) Has anyone else had this problem when trying to pull the codes? The CEL stayed constantly lit while doing this- no flash, no nothing.

2) Any idea why it's bogging at low RPM only when the CEL is on?

3) Any idea why it throws a CEL when it's wet outside?

Thanks,
Brandon

[Splinter]

This has been covered before

The green connectors are the test mode connectors, it cycles various relays in the car. Use the black ones to look for codes...

And you get a code when its wet out because your knock sensor is cracked. Water is getting in and shorting it out.

[Brandon Clifton]

Thanks for the reply- I'll check it out this afternoon.
Can you send me the thread where this was covered before?

I used the search feature and got nothing useful. That's why I posted.

[Legacy777]

The sticky in this thread would have provided some info too.