Xeros

Thanks to my super brittle super dried out and shitty engine harness my air intake sensor wires broe right off the plug today....I tried to patch the plug up best I could....but I am not sure if it is going to work properly....soo how badly will this affect the engine if it doesn't work...any suggestion for replacment or patchings?

Hyperite

I think it'll pop a check engine light and put you into limp mode if it's not connected.

Xeros

uuuggggghhhhhhhh!!!!!!!!!!!!!!!!!!!!!!!!

littlemilla3

iTrader: (1)

If it doesn't put it in limp mode, it will make it run super rich.

jeff48

It will tell the ECU that it is -40 degrees C and increase the amount of fuel in all cells'

Hyperite

Will it pop check-engine? I thought I remembered there being a time on the O2 and Air temp sensors that if they weren't within specs after a certain amount that it tossed a code.

Xeros

Well no code that I can see and it doesn't seem to be running any richer than usuall so I am hoping my pathc of the wires worked and that I have no problem...my idel sits perfectly as well.

littlemilla3

iTrader: (1)

you might have no problem now, but if i were you i'd solder those wires back on so you don't have a problem in the future. You will get a CEL if the wires are broken, so it looks like you are OK for the time being...

Railgun

I now have plenty of experience in this.

It won't pop a CEL, though with a stock ECU it may. My PFC read it as 5V, which translated it into a high temp (I think it was something like 80+ C). That I think would cause it to run lean. High temp air = less dense = less fuel. Fortunately, there are several connectors that have the same physical configuration, some of which are related to emissions. Best bet is to see if someone here has an extra one. Due to my debacle of a project with my wiring harness, I don't otherwise I'd send one off to you.

It ran fine for me, but I was just idling. I wouldn't suggest driving it.

DaleClark

iTrader: (55)

May also want to hit up a junkyard - Mazda may have used a similar electrical connector for other '90s Mazdas. I got a few fuel injector connectors that way .

Dale

jeff48

Actually the PFC sensor reading (0-5volts DC) has an inverse relationship to the Air temp expressed in degrees C. 5.00 volts is reported with the sensor unplugged and therefore the failsafe position for the computer is full rich. You will be totally safe to drive (and boost) but performance and gas mileage will suck.

Xeros

yeah I got to admit it seems to be pulling a little slowly this time around...I think it is either becasue th elines between my actuators are twice as long...or the air temp meter is feeding me too much gas.

Railgun

I suppose that makes sense (it actually read 4.99v). But what's "full rich?" Extra %age of duty cycle?

jeff48

Right you are...4.99v with the AIT disconnected.... and based on the curve presented by the INJ v Air Temp adjustment, I would guess "full rich" is about 20% increase in duty cycle.