a/f question

[greyspyder117]

I am having problems getting a a/f reading even close to what it should be. I am trying to get it right on a 97 Eclipse spyder and the current mods are Pace setter down pipe and cat. HKS Ti cat back, Hks ssqv, injen intake, Aem Gauges boost, oil pressure, a/f, i think thats all that's on the car. I did a boost leak on the car and found one near the injector seal and the biss screw. I fixed them both no problem. putting 20lbs on my air comp i have no leaks from which i can tell with soapy water and my ears but the a/f is still off like the 16's just letting it sit with it on. I sat in the car and i noticed with just the key in the on postion when all the gauges come on that the a'f is still moving but now it's in the 17's and like i said the car is not running. Would this give me a clue to whats going on or no? Whats else is there other then boost leaks that will make a a'f not right? Also i forgot to mention when i go to WOT the aem a/f gauge goes all the way to the left and then goes the three straight lines me guessing that's just off the scale. What is doing this please help i need to get it right so i can throw on dsmlink ... ect i have waiting

 

[bento]

With the car shut off and just the key on is not going to give you an accurate reading. The car needs to be running.

 

[snowborder714]

Where is your wideband sensor mounted? If it's after the cat, your readings will be a bit off.

And yes, the car has to be on. Otherwise you have no air mixing with fuel.

 

[Oliver@Slowboy]

It will run 13+ afr when its not under load (idle, cruising), there is no strain on the engine then. When you are under load (accelerating, going up a hill, ect) is when its important to have your afr in check.

Oliver
[email protected]

 

[greyspyder117]

My wideband is before the cat. The cat came with a bung installed already with it it's made like that At idle it's like 16.4 and as soon as i put my foot about 1/4 of the way down to the floor the wideband reading already went left (lean i think) off the scale it doesn't even read. Why does the a'f go up and down with the car off if air and fuel not mixing it does jump a lot only one or two points but it does move with the car off. Anything other then boost leak messing up a/f's

 

[snowborder714]

Do you have an exhaust leak? That will cause your ratio to go lean at idle.

 

[greyspyder117]

exhaust leak hmmm didn't know that. I know this might sound funny but any easy way to locate a leak like that easy or no? Like i know it might not be a good idea but something like the soapy water test for boost leaks. The reason i ask is cause thinking about it i can't notice a exhaust leak. To mess up the a/f on a exhaust leak could it be in a certain place?? It must be before the o2 sensor for the wideband right?

 

[snowborder714]

You could use Seafoam to try and locate the exhaust leak.

Do you have link installed? If so, do you notice anything abnormal with the parameters in there?

 

[greyspyder117]

No from what i understood i shouldn't have link installed until a get that a/f ok... Would it be easier to hook up link and post a log. let me look up this seafoam stuff

 

[snowborder714]

You can install link whenever. It wouldn't hurt to install it and check out a log.

 

[greyspyder117]

Thanks for all your help i will install link tomm and post a log for you The seafoam stuff looks a lil crazy but the next up coming oil change if i can't figure it out by then i will buy a can oh by the way nice color 2g thought it was green at first till i looked at your pics

 

[zhjiln]

definitely sounds like a exhaust leak...maybe your turbo manifold is cracked or a leaky flex section...