Problem Resolved [was I'm Stumped], Runs briefly, then dies & won't restart |
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Problem Resolved [was I'm Stumped], Runs briefly, then dies & won't restart |
ThinAir |
Aug 2 2008, 04:04 PM
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#21
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Best friends Group: Members Posts: 2,543 Joined: 4-February 03 From: Flagstaff, AZ Member No.: 231 Region Association: Southwest Region |
Background: In preparation for last year's RRC I fixed the mounting on the MPS of my son's stock 1971 914-4. All seemed well until we went out for the Saturday morning run - we turned a corner and the engine suddenly died and was clearly flooded. It restarted quickly, but we had the same problem several times on that trip after that.
I assumed that I had disturbed something electrical on the passenger side of the engine and in digging around I discovered that the wire connecting the Cylinder Head Temp Sensor was corroded at its base (in fact it fell off in my hands). Ok, this is simple I said - so I bought and installed a new CHT. Current Problem: The engine will start, but runs for only about 30 seconds before it dies. At that point it will not restart, but it smells of fuel as if it is flooded. I've checked for spark and I have spark. I've disconnected, cleaned and reconnected every electrical connection on the engine & relay board that I can find - including every relay on the board. The only connections that I have not checked are the connector where the FI harness connects to the brain. Does anyone have any ideas on what could cause this and where to look next? |
ThinAir |
Feb 3 2009, 10:55 PM
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#22
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Best friends Group: Members Posts: 2,543 Joined: 4-February 03 From: Flagstaff, AZ Member No.: 231 Region Association: Southwest Region |
One more note. When I got it running the air cleaner was installed, but I removed it so I could have better access to adjust the idle bypass screw. After I had it running where I wanted it I tried to put the air cleaner back on and got the same behavior that the engine would die when I put the snorkel into the cleaner. (IMG:style_emoticons/default/headbang.gif)
I finally figured out that the hose from the throttle body to the distro was positioned so that as I was finger-rotating the idle screw the hose was moving and disturbing the connection to the nearby sensor in the other side of the plenum (can't remember the name). Once I moved the hose and made sure that connection was good things have been fine. This adventure has sure had its share of things I've never seen before, but maybe it will help someone else! |
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