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Intermittant kill/start issue solved 200 84.5ti

My kill/no start, passive aggressive fule delivery problem has been solved. If you have read the previous posts you know what I've done. The car has been giving me fits.

Yesterday I bought a new used fuel pump that had been bench tested. I went home jumpered terminals 5 and 7 on turned the car on. While the in-tank pump hummed I droped the main fuel pump and disconnected the power to it, I connected the new pump which failed to come to life. When jumping 5 and 7 both pumps should come on. The juice at the pump reads 12.16 according to my voltmeter but fails to kick it over, I don't know why.

This propensity to suddenly die has been linked by me to sharp turns then a death, as well as relay failure (I bought a new one). Initially I thought the sharp turn kill was because of low fuel and vapor lock, but that wouldn't prevent a restart relatively soonafter. The car would die and I was stuck with a no start. This sharp turn business continued even though I had a full tank, I thought it was the relay which I let hang by the wires in case of a stall and I'd tap it and the car would spring back to life.

There are a whole mess of wires under the dash. Yesterday, like I said, I hooked up the new pump which didn't come to life, I was really stumped. I looked over at that mess of wires coming from under the dash and gave it a jiggle, suddenly the pump sprung to life! Yes I thought, I'm not screwed! I jiggled some more and it cut our again. I continued this for a while, twisting each connection when I came upon two wire that led to the firewall, exited and continued along the driver's side firewall all the way to the front of the battery where it disappeared. I got to the end of the wire and it didn't terminate anywhere it made a loop and went back to the firewall!..l(!!!!!!!!!!!!!!) What in the hell is this damn wire. The short was occuring at the begining of this loop (a larger yellow wire) before it left the interior it had been spliced twice and tube-type connectors installd right up near the firewall section which over time vibrated loose. When I took a sharp turn, hit a bump or if the moon and the planets were't positioned properly then I'd get a kill or no-start.

This little short was sufficient enough to create some resistence or some interference that would reduce the voltage just enough to prevent the main pump from operating at all. Geez. In the back of my mind this was the gremlin that I didn't want to believe existed in my car. I've changed the wire harness etc. Luckily I was able to find this dang thing, I am lucky. Thanks very much to all who offered help. My fuel and relay situation is now tight and I have learned alot as well as gained some needed confidence. Now for my next trick, a clutch cable on wifeypoos 242.






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New A tale of two fuel pump relays [200][84.5ti]
posted by  someone claiming to be Josh Lasserre  on Sun Jul 15 15:17 CST 2001 >


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