Question about CEL code 43 (Fuel supply system)

ASSISTANCE Stock Engine-Bay Components
1

Hi there, my CEL is on and I am getting a code 43 (fuel supply system)
I did a SEARCH and found that code 43 is usually just the O2 sensor.
When the car (1990 Teg RS) gets up to running temp it will stumble and sputter under light acceleration.
Do you guys think that it indeed is the O2 sensor?
All help appreciated.

2

Yes. :slight_smile:

3

I replaced the O2 sensor, and what do you know? No more CEL.

Thanks.

4

Its not usually the 02 sensor, it can be the 02 sensor which in your case it was…

it can be as simple as a clogged fuel filter… like in my case :wink:

5

AHHH what else could this be? I had this problem like 6months ago, replaced the o2, didnt fix it, went away radnomly about a week later, and now 6 months later its back…Looking for ideas, what else could this be caused by?

Thanks

6

whenever i run my car open header i get a cel 43

7

pirate: search about the main fuel relay, I thought I had an o2 sensor problem, but it turned out that my fuel relay was bad. They both do very similar affects to the car. (though a bad fuel relay results in your car not starting if its bad enough)

8

I read about this problem last year and took it out to resolder it, and it looked fine. Mine stops bogging as soon as the cel comes on, which I was told when the cel come on it stops listening to the o2 and runs of the default fuel map, so it must be o2 related since mine starts acting fine after the cel comes on…

Thanks for the idea though.