apritchard at seaeye.com
Wed Jan 14 03:46:56 EST 2004
Hi, this came up on one of the ms lists the other day.....was it you? If it
wasn't the recommendation was that there is a dampener on the standard fuel
pump which should eliminate your problem.....
From: Jeff Redig [mailto:birdmanmt at juno.com]
Sent: 13 January 2004 18:17
To: quattro at audifans.com
Hi everyone, new to the list. Heard aobut it for a couple months and
decided to check it out. I live in bozeman, MT and drive an 87 5k tq.
This fall i converted the car to EFI with the megasquirt DIY efi system.
It runs quite well now, better than i ever did on CIS!
I've got an issue with the car, or at least i think i do, concerning the
efi system and someone recommend i post here and see if anyone has any
ideas. So here we go....
As i said above it runs really well with the EFI, however i'm getting a
knock in the fuel system. I don't really know how else to explain it.
At first i thought the accumulator might be going bad. Is there a way to
test it? I now think it's just because the accumulator makes contact
with the undercarriage making the knock/pulse the most audible there.
So when the car is cold it knocks loudly....but as it warms up it gets
quieter. It's still there but not as audible. If i put my hand on one
of the fuel lines under the hood there is a definite pulse i can feel.
It matches the injectors firing exactly. I'm going to try using multiple
smaller squirts of fuel per cycle and see if that helps. As far as i
know the other people running MS on these cars don't do this though, and
haven't had this knock/pulse problem which leads me to believe it's a
unique problem on my vehicle. Meaning something's broken!
My other thoughts lead towards my fuel pump and a fuel dampner. I've
replaced my fuel pump with a pierburg which doesn't have a dampner on it.
So there isn't a dampner in the fuel system anywhere. I'm wondering if
this would take care of the knock? I don't know exactly how a dampner
works....some sort of a diaphragm.
Any thoughts or considerations would be much appreciated!
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