I have a problem with my idle. The car idles rough and at a steady rpm the engine light comes on. Code 43. I checked my O2 sensor and it seems to be ok. But the car wants to run lean. Too lean. I adjusted the fuel pressure, but it did't help a lot. The engine light still comes on. I'm not sure where to start. Please Help.

 

43 Fuel supply system

You need to change your fuel filter and see if the code goes away.

 

I have changed th fuel filter and the fuel pump.

 

Injectors?
Regulator?
Have you had the fuel system cleaned?

 

I replaced my injectors. And put in an adjustible fuel regulator.

 

So are you sure you are getting a code 43......just bare with me.....

Did you clean the fuel rail when replacing the injectors?

 

I'm sure of the code 43.
But I did't clean my fuel rail.

 

I cleaned out my injector rail. It doesn't seem to make a change. Still the same thing.

 

how did you check your o2 sensor?

 

I checked the O2 sensor. It seems to be working fine. I'm just not sure if the signal form the O2 sensor is getting to the ECU.

 

 

With a multi meter. And someone with a new O2 sensor. Fined the signal wire. And check the voltage on each, and compare. The lower the leaner, the higher the richer. You want to be around .450. My O2 sensor gave the same readings. So I think it is safe to say my O2 is okay.

 

Did you check the high and low range of the O2? Does it measure over .8v at wide open throttle? Does it quickly go below .2v when the throttle is snapped shut? BTW, this assumes you have it warmed up to normal temperature.

 

I did check the O2 with the car at normal temp. And I did check the range. And it did go from over .8v at wide open throttle. Then quickly go to below .2v, when closed throttle. Then if left to idle the voltage goes to 0v and slowly goes up to about .2v.



[Modified by Litoman, 9:44 AM 8/11/2002]

 

What is your fuel pressure? What happens when to your O2 voltage when you pull off the FPR vacumn line?

 

I haven't looked what the O2 voltage is when I pull the FPR vac. But I mad a mistake in my last message. The voltage when throttle is closed is 0.02v not 0.2v.
Sorry...


[Modified by Litoman, 9:39 PM 8/11/2002]

 

What is your engine setup? How big are your injectors, fuel pump? How much fuel pressure do you have. What do your spark plugs look like?

 

possible vacuum leak? do you have anyway to wiew scan dataor 5 gas analyzer data. Possibly air bieng introduced into the engine after the throttle body could cause the car to run lean the fuel system will only compensate so far.is the vehicle running lean and setting a code or rich as a result of lean info from the o2 sensor?

 

My engine is a D16y7 with a 92 DX intake manifold. And running all 92 emision.
The injectors are stock 99 CX, fuel pump is a Holly, fuel pressure is set to 47psi without vac. I had to raise the pressure or th car would stall. And the spark looks ok.

 

I checked for vac. leaks. By spraying carb. cleaner around intake manifold. It did't seem to have a leak. But I could be wrong.

 

time for a mechanic?

 

how not?

do you have a FP gauge? what does it read? waht did you increase it to?

it should assist you.

in fact - it should make your car run richer no matter what!

t..

 

It only helped a little. The car doesn't stall at idle. I installed a pr gauge on top of my fuel filter. It originaly read 41psi without vac. I set it to 47psi without vac. I'm not sure how hi I can increase it to.

 

sounds OK...

but your O2 sensor voltage sounds OK too,

what is the problem exactly?

the car runs rough at idle? and you got a code 43?

has this been cleared? did it come again?

how do you mean "too lean"?

this "I had to raise the pressure or th car would stall." is very weird!


now that you mention it - which injectors?

did your car come with Peak nad Hold or Saturated injectors...?????

t..

 

The car is running rough idle, and code 43 comes up if driving at a steady speed or idle. The only way the car is running is by increasing the FP, and while driving pulsing the gas.

With the lean part. I was told by a mechanic that from the readings I was getting. The car was running lean. I know the higher the voltage, the richer and the lower the voltage, the leaner. But I am not 100% on what the car should run.