my 1st gen pr3 b16 runs at normal temp w/ stock header perfectly. I installed a 2.5" 4-1 w/ open header,now when I leave it idleing for long periods of time, it starts to over heat. (then cools back down when I start getting on it.

Do you think that because I connected both o2 wires into 1 o2 sensor affecting it? or something else?

Basically when im stuck in traffic my car hates me heats up, then it cools back down and loves me when I hit vtec 5800 - 8600 rpms.

any body else ever tried to connect both o2 wires for the one bung header?

thanks for everything

 

replace your Temp Thermestat

 

wire your 02 sensors correctly, your fan should be comming on while at idle.

 

Does it cool own only once you start moving again? I will assume so since you can't engage VTEC while sitting still AND you say VTEC really 'cools it down'. If this is the case, it is likely that you forgot to reconnect the fan(s) after the header install.

 

first ck the fan then ck the thermostat