Running rich - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

Casper · 11-06-2003, 16:39

I'm sure this has been gone through many times but indulge me please.

As many of you know I have an AU1 XR6 VCT that has had no modifications to the engine. What I have found (or suspect) is that the engine is running too rich. With heavy acceleration I seem to be getting a lot of unburnt fuel (brown hazy smoke) out of the exhaust.

Can anyone offer a simple fix to run the car a bit leaner?

89F150 · 11-06-2003, 18:39

Could it be a Oxygen sensor thats shot?

TopGhia · 11-06-2003, 23:55

Coolant temp sensor. Get someone to pull the codes. That may point you in the right direction.

fordfan351 · 11-07-2003, 00:00

As i understand the 4.0 runs pretty rich in it's basic programing, you can buy an adjustable regulator for the fuel pressure and lean it back, prolly give u 5-10kw gain.

At a recent Dyno meet here in SA, all the 6 owners who utilised the adjustable regulator saw hp gains.

Casper · 11-07-2003, 00:03

Quote:

Originally Posted by fordfan351

As i understand the 4.0 runs pretty rich in it's basic programing, you can buy an adjustable regulator for the fuel pressure and lean it back, prolly give u 5-10kw gain.

At a recent Dyno meet here in SA, all the 6 owners who utilised the adjustable regulator saw hp gains.

Who/where can I find out more about this regulator?

Rollin · 11-09-2003, 03:49

you could get a standard one and put it on - XRs have 50kpa more pressure all the way through the range, so with a stocker it would lean it out

BLWNEB · 11-09-2003, 04:12

sounds like it could be the o2 sensor but take it to a dyno tuner he will be able to tell you whats wrong

honer · 11-09-2003, 17:15

Hehehe Casper bet you wish you had an AF gauge now

Casper · 11-09-2003, 17:20

Quote:

Originally Posted by honer

Hehehe Casper bet you wish you had an AF gauge now

Why not get 2 of them??

That way I could look at the numbers, not have a clue what they mean, not be able to tune it even if I did, and look like a ricer at the same time. AND DO IT ALL IN STEREO!!!!

No, I think a A/F gauge is still rice :s6:

89F150 · 11-09-2003, 17:43

Quote:

Originally Posted by Casper

Why not get 2 of them??

That way I could look at the numbers, not have a clue what they mean, not be able to tune it even if I did, and look like a ricer at the same time. AND DO IT ALL IN STEREO!!!!

No, I think a A/F gauge is still rice :s6:

You'll have to take the back seat out... you'll have too much weight if you had two