What sensors effect the timing on a Ford Focus?

Question:
My Focus sohc misses and stalls when cold., then barely turnes over like the timing is off, until I wait a few minutes then it turns over and starts and runs betterIt acts like the timing is changing somehow.I've replaced wires.coil,fuel filter, TPS & IAC sensors.No codes come up. I'm starting to think the ECM is bad.Any thoughts?

Answers:

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This could be one of several issues - not necessarily timing. The timing advance is controlled by the ECU with inputs from the O2 sensor, throttle position sensor, temperature sensor, engine knock sensor, and RPM sensor.

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The first thing to do is to scan the prom with a scantool and check for errors. Misfires will probably show up. It may indicate something obvious, like an O2 sensor or fuel pressure problem.

I cannot control my idling in my BMW 1989 525i, last ninth while my driving it suddenly engine idling change?

Cold running problems often stem from a mixture which is too lean and this message usually comes from the O2 sensor which is supposed to "read" how rich the mixture is. It may be giving the ECU a false signal. On your car, you probably have 2 - a pre and post cat sensor.

Have a 2001 grand am that is not getting power to fuel pump?

You may also want to check the obvious easy things like air filter, plugs and wires...

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I would suspect the crank position sensor. If these get out of whack, they don't start good. I have seen this before.

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