What does "(it was coding) and no more codes" mean? It wasn't running, but it's running better?
How long does it run before it stalls? Will it stay running if you hold your foot on the accelerator pedal? If it runs properly as long as you press on the gas pedal, the battery was recently dead or disconnected and you must relearn minimum throttle. Defective sensors won't prevent the engine from starting.
To start, find the two small wires on the back of the alternator. Measure the voltage on them. One should have full battery voltage and the other one will have something less but typically not less than 4 volts. You MUST measure these voltages within two seconds of turning on the ignition switch OR when the engine is rotating, (cranking or running). If you find voltage there for two seconds after turning on the ignition switch, but not while cranking, the Automatic Shutdown (ASD) relay isn't turning on. The only reason to measure on the alternator is it's easy to find those wires. What you're really looking for is 12 volts feeding the injectors and coils, but they're all on the same circuit along with the fuel pump or pump relay.
Which sensors did you change? And if you had diagnostic trouble codes, what were they? You've added more variables to the equation by replacing parts before the problem was diagnosed. Besides the original problem, the engine computer must relearn sensor values and reconcile them with each other. With so many changes, you might end up with fault codes for circuits that have new parts in them so you'll be hunting for problems that don't exist.
If you had codes related to the camshaft or crankshaft position sensors, suspect a sheared off locating dowel pin for the cam gear. The cam slips a little on the gear so its timing is late. This mimics a timing belt that has jumped a tooth. When the belt jumps one tooth, (or the cam gear slips an equivalent amount), the engine computer turns on the "Check Engine" light and sets a code for "Cam and crank out of sync". Two teeth off and the computer shuts the engine down by turning off the ASD relay. Three teeth off and valves will hit the pistons.
Check the timing belt first, and the relationship between the cam and crankshaft timing marks. If they're right on the money, remove the cam gear to inspect the locating dowel pin. If you're careful, you can tie the timing belt to the cam sprocket when you remove it so you won't have to go through the hassle of resetting it later. After reassembling the cam gear, rotate the engine by hand two complete revolutions to be sure no valves will hit the pistons, before you try to start it.
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Wednesday, December 2nd, 2009 AT 4:51 AM
