How does a fuel pump sound?
I'm trying to diagnose why my car is losing power, having an irradic idle and frequently unresponsive to throttle.
I'm trying to diagnose fuel delivery as a problem. I pulled the access panel to the pump in the trunk and listened to it while the car was idling, or trying to idle. I wasn't able to hear the pump with the engine running all that well except for right before it was about to stall, and immediately after it did. During this time I heard a hissing sound like it squirted fuel into the lines. When this happened the engine rpms would shoot up for a few seconds. This cycle happens every 5-10 seconds. It'll nearly die, hiss, rpms kick up, then they'll fall back down till it nearly dies again. I realize I need to test more for a definitive answer, but I wanted to see if I could get some feedback while I go out and collect items to put pressure gauge and such.
I just cleaned out the ICV, but it didn't seem to help the car situation at all. Car is throwing code 1221 which is new as of new years eve when this all started happening again. Before then it was throwing 1213 when it was throwing fits, but I don't think it was related as once I changed intake gaskets that code went away.
Thanks, Bryan
'94 540I 6spd/205000 miles