Reduced Engine Power - limted to 11mph - 986 Forum - The Community for Porsche Boxster & Cayman Owners

BobX · 04-24-2011, 01:11 PM

First nice weekend of the year, I went to start my 2000 Boxster w/ only 20K miles on it. Battery was completely dead so I put a jump on it. It took several tries but it eventually started. Ran rough but as expected because several attempts of starting loaded it with fuel. I went to back out of garage and the vehicle stumbled. I went to take a nice easy drive around to clean out the excess fuel and I couldn't go past 11mph. Not in first gear or in second gear. Engine runs smoothly, no misfire, no CEL, but it's just limited like the engine controls is in some protection/valet mode. I figured 11mph is 20kph so it is controlling to that speed. Like I said, no check engine light and the vehicle runs relatively smoothly, to 11 mph. At idle, it will run smoothly at 1000rpm then dip below and run rough and keeps cycling that way. Anyone seen an issue like this? Thanks for your help.

Paul · 04-24-2011, 01:56 PM

You need to reset your egas.

Turn car off

Turn ignition on (Do not start) (DO NOT TOUCH THE GAS PEDAL during this procedure)

Wait about a minute (you'll hear the throttle motor run in the engine compartment)

Turn key off for at least 30 seconds.

Start car and see if it's fixed.

BobX · 04-24-2011, 05:31 PM

Thanks for the suggestion, Paul. I tried what you posted and after sitting for several minutes (4 to 5) I never heard the throttle motor. I'm guessing your suggestion has something to do with the electronic throttle control and learning minimum position (accelerator pedal or throttle blade?). Regardless, I tried a couple times and could not fix it. Any other suggestions would be appreciated. I even tried disconnecting the battery for several hours. Thanks.

Paul · 04-24-2011, 05:59 PM

Time to check for faults in the DME.

Steve Tinker · 04-24-2011, 08:31 PM

Did you fully charge the battery (over 12 hrs on a charger) before trying to reset the e-gas?
If you try what Paul suggests without a fully charged battery (~ 12.6 v at the terminals) you are wasting your time as the DME is very voltage sensitive....

jmatta · 04-25-2011, 04:44 AM

Time for a new battery...buy a maintainer while you're at it. You can't let these cars sit and drain the battery...causes all sorts of problems, as you're finding out.

Jager · 07-09-2011, 07:51 AM

Quote:

Originally Posted by BobX

Thanks for the suggestion, Paul. I tried what you posted and after sitting for several minutes (4 to 5) I never heard the throttle motor. I'm guessing your suggestion has something to do with the electronic throttle control and learning minimum position (accelerator pedal or throttle blade?). Regardless, I tried a couple times and could not fix it. Any other suggestions would be appreciated. I even tried disconnecting the battery for several hours. Thanks.

While performing the adaptation, keep cycling the key until you hear the motor on the Throttle Body engage (you should be able to hear the motor on the Throttle Body). I have read where this has taken a few turns of the key for some reason. Leave the key on for one minute, then turn the key off and remove from the ignition.