knorrena

I took my GT3 to an autocross event for the first time over the weekend. It was glorious for 2 of six runs. On four of the runs I coasted through parts of the course because i had no throttle response at different parts of the course.

I could floor the throttle 4-5 times in quick succession with no response. When that failed I just coasted until it came back to life after 2-5 seconds. The fuel was near full (7/8), and rpms ranged 4-7000 before it died.

After some research I think the problem is my fuel pump, but I would like to get your collective feedback.

himself

Left foot braking? Sometimes I get a hiccup when I have both pedals down (even a little).

-td

DHI

I had a problem a few years back but this with a tank that was at less than half tank.

The pump assembly came loose from it's "receiver" mount on which the assembly twists on at the bottom of the tank. The pump assembly would float causing power loss under lateral loads.

Sounds like your problem is either pump itself or electrical to pump.

Let us know!

knorrena

I was using both feet at the time, but this was more than a hiccup. The engine dropped right down to idle and would not respond. It does not happen on the street under aggressive driving, but even aggressive street driving does not come close to the driving during the autocross I participated in.

knorrena

I just read this thread:

https://rennlist.com/forums/996-gt2-...e-corners.html

Perhaps I was LFBing too much and the car protected itself?

That would be very disappointing for two reasons: 1) I posted crappy times; 2) I posted crappy times because of a bad driving habit so egregious that Porsche planned against in a car that otherwise has no electronic interventions.

Does porsche offer an documentation on this?

AudiOn19s

Unless you're accidentally resting your foot on the brake slightly the throttle should come back immediately upon coming off of the brake pedal.

The pump coming loose in the tank is not uncommon I'd look into that as well. A friend and local auto-x competitor had that problem recently with his GT3 causing similar symptoms to what you're describing.

knorrena

I cant wait. Its been a while since I have been all hopped up on gas fumes.

While the following link is for a 996 GT2, it shows what I can only assume to be a very similar set up to the GT3

https://www.6speedonline.com/forums/...-pictures.html

The part numbers are the same across both: 996 620 057 92

mkk62

another thread my problem went away after fuel pump replaced now can run real low...


https://rennlist.com/forums/996-gt2-...rvation-2.html


hope yours is the other problem...

mk

Gofishracing

I had my pump upgraded.

Gadsby

Check mass Airflow sensor connector, I had connector fail at road america last mount in first session. Totally felt like fuel pressure problem. Connector fell off the sensor as soon as I touched it.

Zip tied in 2 minutes then enjoyed the rest of the day!

knorrena

I did check the maf sensor. Its good.