Dam 914 still doesn’t start regularly |
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Dam 914 still doesn’t start regularly |
Kevan |
Mar 22 2004, 09:15 PM
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#1
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Newbie Group: Members Posts: 31 Joined: 5-December 03 From: Paso Robles,ca Member No.: 1,421 |
My 914 still doesn’t start regularly. I turn the key and every time I heir the buzz my guess is the D-Jet fuel pumping and then it might start or nothing happens. Once it starts cranking it will start just fine. Here is a list of what I’ve done. What am I missing??? What could be wrong?
New battery Clean the connections on the battery New ends on the positive wires to the battery New ignition switch Clean and replaced connections on the starter solenoid Cleaned ground strap connections from tranny to trunk Kevan |
mightyohm |
Mar 24 2004, 11:48 AM
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#2
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Advanced Member Group: Benefactors Posts: 2,277 Joined: 16-January 03 From: Seattle, WA Member No.: 162 Region Association: Pacific Northwest |
You put a reverse biased silicon rectifier diode across the coil terminals of the relay.
To do this, the negative side on the diode hooks onto the +12V side of the coil. The negative side is the one with the white band around it. In normal operation the diode has no effect since it cannot conduct current in the reverse direction. Diodes are like one way gates. They only conduct electricity in one direction - from their positive terminal to their negative terminal. Here is how it works. When +12V is removed from the relay, a big voltage spike of several hundred volts appears on the terminals of the coil. This voltage spike is what causes arcing and damages switch terminals. The polarity of this voltage spike is in the reverse direction of the voltage that was applied. This voltage spike now turns on the diode and the spike gets shorted out at the relay before it has a chance to do any damage. |
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