Calmchaos

TRIED to get my car inspected today..... Pass on all the little crap.
But on the emissions i was WAY over on the CO%.
The car is SUPPOSED to get .98% mine was running between 3% and 7%!!!!
What the heck! Thats not even close! And I have no idea what to do to make it better!

Oh yeah... and the mechanic doing the inpection said that there was WAY too much gasonline in my oil? I don't even know what that means.

-Brett

Techno Duck

Gasoline in the oil means you are running very rich. Possibly a bad fuel pressure regulator.

High CO content in the exhaust is also an indication you are runnning rich.

Other things worth checking are...

cat. converter
O2 sensor
spark plugs

Calmchaos

how would i test the FPR?

What role do the AFM and O2 sensor play in high CO content?

Oh yeah and BTW... every once in a while my car will start sputtering and when i take my foot off the gas it will stall out. Afterwards I usually open the engine up for a couple hundred feet and it temporarily fixes the problem.

Techno Duck

Check your fuel pressure, a failing FPR will likely result in a higher than normal pressure. ClarksGarage has an excellent writeup on how to do so.

Calmchaos

I just ordered a new FPR since its only $65. I'll put it in ASAP.
Is this probably why my car starts supttering and stalls out on occasion? And then runs fine after I blow it out.

My spark plugs are brand new NGK Iridiums.

Calmchaos

any other oppinions on the source of my problem?

Calmchaos

Is there any chance the fuel damper could be a problem?

Techno Duck

I say again, check your fuel pressure. If the dampener is bad, it will cause the fuel pressure to constantly bounce around. The dampener is only meant to stabalize fuel pressure when the injectors open and close.

Also check the fuel pressure to see if the regulator is bad. Your fuel pressure will be higher than normal if it is.

stuvx

For $65, you could have bought a fuel pressure tester and possibly a cheap voltmeter, which you could have used to test your FPR, AFM, and O2 sensor.

Don't throw parts at a problem, you'll only waste money and give yourself a headache.

Like techno Duck said, Clark's Garage has very good right-ups to test everything I just mentioned.

You're definately running rich.

njwilser

I think a failed 02 sensor will also cause a rich condition. Easy to check or unplug and monitor. Not always to easy to replace. Don't ask.

Calmchaos

I just threw in the pressure regulator. For $65 I figure a new one is better than the old one even if it doesn't fix the problem.

I'll see if it sputters and/or stalls tomorrow.

A brand new funny problem arose today though. I was sitting in my corolla getting a parking sticker out to put on the 944... and I left the 944 warming up for a second (It was cold this morning) and within about 2 minutes of me turning it on it rev'ed WAY up. I couldn't see the tach at the time but my guess would be about 4.5 maybe even 5K RPM. I sprinted out of the corolla to the 944 and by the time i got there, it had idled back down.
Now I assume the throttle didnt actually open (seeing as there was no one to open it). The gas was very dark so it seems that something decided to dump a buttload of gas into the engine. Seems strange... cuz it is. LOL. I have no idea on that one.... TPS maybe? I don't know.

Next thing I will check is the O2, hopefully I can successfully test it. But if it's bad, odds are I would have to replace the Cat too right? Doesnt a bad O2 eventually destroy the Cat?

Thanks for the help
-Brett

emilysgranny

check the idle control valve , maybe gunked up . A loose connection at the tpi or a bad tpi would cause a surge also. HTH

Calmchaos

Another thing i do know. When I first start the car up, it idles at a little over 1K rpm. I dont think this is stock, doesnt make sense. But when I try to lower it my car stalls out. What should my idle be? I seem to remember hearing 800?

Peckster

The gas was very dark?

KLR

O2 sensor is a likely culprit -- if it fails the car will default to running rich. If the car is running rich long enough, it will go bad. Is yours original? If so, it should be replaced regardless. Do a search and you'll see how to replace it with a generic bosch sensor that is much less expensive than the porsche 944 specific bosch sensor.