Hey, I'm having a similar problem to some of the other people who are posting about idle problems. But mine is worse than an idle problem, I cannot get the engine above 2,000 at all. The idle is bouncing around 1,500 (my idle has always been high, around 1,000) but normally i can drive it just fine (like earlier today up till now) the engine does not stall, but It is un-driveable because I cannot get the engine above 2000, even at full throttle. It feels like it isn't getting enough gas... it's rediculously cold here in pa, but i really need to be able to drive my car... please help (is there anything aside from the bac that i can check, some sort of temp. sensor or something that regulates gas?) this is very frustrating, and I'll get a video of what it is doing and post it later this evening if nobody has any sugguestions that work, thanks!

 

bump

 

Hmm I would have thought limp mode due to OMP, but seen you have a S4.

When was the last time you did a full tune up?.. Check air filter, gas filter, and make sure that primary and secondary butterflys in throttle body are opening up when you hit the gas pedal, Maybe cable has came loose?





Edit: signiture picture is way too big.. 640X480

 

My AFM went out on me. I had similar problems when it failed. just an idea.

 

the air filter is new as of the summer, replaced the gas pump (so the filter is fine). New secondary injectors put on by rp-performance (rotary shop in virginia) and when i hit the gas, it will rev Faster. ALSO sometimes it works fine, and then sometimes when i hit 4,000 rpm (when secondaries kick in) it will go to the weird 2000 rpm thing...

Spraintz... what were your specific problems when the air flow meter failed, or anybody who knows exactly what happens when it fails? If i run the codes, will it find that? again, any help is VERY appreciated, as it is my daily driver (to college...) :-/

 

does it bounce at 2k rpm, like a rev-limiter, or does it just sit a 2k like you're holding the throttle?


p.s. Yeah, your sig pic is way to big, read the forum rules.

 

it bounces exactly like a rev-limiter, and i'll fix the sig pic soon

 

yeah, thats limp mode.

Have you tried letting it warm up entirely before driving it?

There are a lot of things that will cause limp mode, mostly (in my personal experiencs) it's temperature related. Make sure your coolant sensors work.

I haven't found a solution to eliminating limp mode alltogether except buying a stand-alone system. (microtech, haltech, etc)

 

yes, i have let it warm up entirely (idled in my driveway for 25 minutes) I'm pretty sure that this is temperature related, as it drives like a champ when it's warm. How do I go about checking my coolant sensors, and what type of "stand-alone system" should I looking for?

 

::another bump::

 

just pick up a new thermostat as a start

and if you dont know what a stand alone does or which to buy, you dont need one.

 

my problems when my AFM went were just about the exact same thing. it was basically getting stuck or just simply not moving smoothly and that would happen. when I pulled my codes it said I had like 5 sensor failures....TPS, water temp etc. and all it was was the AFM.
I have heard of the water thermo sensor being common for sending the ecu into limp mode.

as far as stand-alones go, unless you are racing or enjoy the tedious work of setting it up and tuning it then I wouldn't use one for the street. the can be kick-*** but can also be pricey in terms of the unit itself and other things you might need to run it.

good luck man