JohnB4209

Bought a 944 that was running with no issues after sitting for a few years. I brought it home and started getting it ready for inspection to get it on the road and went and got a full tank of gas after starting it up it seemed fine then went and got some other items. After starting it up the second time it started having an issue were when if you give it any throttle over an 1/8th it falls on its face. The engine still runs but it acts like its not getting enough gas (links to video of this from inside the car ) but as soon as you let off it goes back to idling fine.
Replaced the following items so far:
AFM
Fuel filter
Fuel pump
Fuel regulator

944M3

Welcome to the club.

Sitting for a few years can result in many different issues.

I would start with checking for vacuum leaks everywhere, and I mean every single hose. Check for rips in the j-boot. Secure all clamps.

Check if water leaked from the battery tray to the DME (ECU computer).

Check throttle position sensor, IF your model has one.

Let us know how it goes.

walfreyydo

Classic vacuum leak symptom, but you also may want to measure fuel pressure to make sure thats within spec.

JohnB4209

So removed the TPS cleaned and replaced the O ring. re-installed it and adjusted properly but still have the same issue. I would also like to mention I forgot to put in the original post that I have replace the DME relay with a new one. Later this week will be checking for a vacuum leak on everything.

944M3

https://www.clarks-garage.com/shop-m...ect-19.htm#tps

Clark has a process to check the signal. Visual inspection is not enough. You will need a multimeter.

My suggestion is to check for vacuum leaks. If you don’t find any, I would proceed with testing the TPM signal.

I used Clark’s instructions to identify a faulty TPM.