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Originally Posted by lmk
When I turn the key to the on position it will prime the fuel pump then a few seconds later it primes it again and again and again.But my fuel pressure is holding at 40 psi. What would cause
it to continually prime the pump without turning the key off and back on again? The only code I get is a 15
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Maybe YOU aren't turning the key on and off, but it is very possible that your ignition switch could be. If it's faulty, it could be making intermittent contact -- just enough time for the relays to close the circuits. Then, even something as slight as vibration from the engine running could be causing the connection in the ignition switch to be lost. I'd pop the column covers to see if there's evidence of heat damage, and then use a DVOM or test light to check for power failure at proper points on the switch.
This problem has puzzled me, because you've already replaced most of the parts that commonly go bad or come to mind.
There is NO WAY a faulty TPS is going to cause your fuel pump to turn on and off, btw. The EEC-IV is in control of its operation via a relay and the power supplied to each; it doesn't care whether the TPS is out of range as far as
fuel pump control is concerned, which should be your main priority right now.
By your wording, you say you can turn the key to the 'on' position, and the fuel pump will continuously prime, correct?
There HAS TO BE a power interruption of some kind for this to happen (without the engine running and then stalling). You've already hit the fuel pump and EEC relays, so that takes them out of the equation. I believe you have a wiring or related problem; somehow the 'chain' is being broken here. It could very well be as simple as a loose/corroded connector on one of those relays. I've fixed several 'problem cars' looking for this type of thing. Check all of your grounds as well as fusible links and power feed wires.
FWIW, your code 15 means (according to this one guy's site, anyway):
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15 (O) No Keep Alive Memory power to PCM pin 1 or bad PCM (Memory Test Failure)
(M) KAM (pin 1) was interrupted (was battery disconnected ?)
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This further proves the likelihood my theory that the computer losing power somehow, somewhere, is correct.
Good luck.
