TruckerBomb

I'm thinking it doesn't have an O2 sensor as I can not locate it.

It has a Racing Beat header and full custom dual exhaust.

What would some symptoms of a bad/missing O2 sensor be?

misterstyx69

iTrader: (142)

The O2 wire is a single braided covered wire that comes off the harness near the back of the TB.

I think the reason why you do not have one is because that wire needed to be extended to put an O2 on your header and it wasn't done.

Evil Aviator

Racing Beat puts the O2 sensor bung in different places, so it's not all that easy to find. Also, some of their headers don't have a bung. The best way is to follow the wire as suggested in the previous post, although this will not work if the wire is not connected.



If you can't tell any difference, then what does it matter?

jjwalker

Typically, your check engine light will be on and your gas mileage will suck. RX7 gas mileage sucks anyway, but no 02 sensor makes it even worse in light throttle/cruising situations.

RotaryEvolution

iTrader: (30)

in most cases you will not even notice a difference if it is gone or there working properly. it's job is very limited, unlike on todays cars.

jjwalker

I agree with you to an extent. I rolled with the 02 disabled on my car for a few weeks and noticed my gas mileage decrease quite a bit.

One thing I did notice though is that under very high vacuum and very little throttle (like say, cruising in 4th gear at 50mph) the port air injection is on and the ECU is in fact ignoring the 02 sensor.

TruckerBomb

It's getting crappy mileage... 13-17 usually... Sometimes less.

lduley

iTrader: (1)

thats pretty average actually

TruckerBomb

blah...

dustindwc

im getting like 146km to a tank thats not average is it

RotaryEvolution

iTrader: (30)

sounds low even for 100% city mileage but city mileage can vary quite a lot to that even being a high number, so if that is 100% city mileage then your question cannot realistically be answered.

do a full tank on the highway for a real mileage consumption test.

dustindwc

that was both city and on the freeway i have went through 2 full tanks and the results are the same

RotaryEvolution

iTrader: (30)

definitely low, maybe your leading ignition has gone on vacation.

dustindwc

so what would be a good solution to this problem

RotaryEvolution

iTrader: (30)

check to see if your front coil is firing with a timing light or an insulated pair of ignition wire pliers.

TruckerBomb

When I hook up a timing light, about 50% of the time it's on mark, the rest of the time is split between off mark, to can't be found...

dustindwc

do you no where a good supplier is to buy new ignition coil

TruckerBomb

nope. do you? lol

TruckerBomb

bought coils from a guy on here, no improvement...

dustindwc

so my coils seem to be fine any other reason i could be getting bad mpg?