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Jumpy idle, harder cold starting than usual 850 1994

Should we assume the check engine light is NOT on?

Seems like either the engine controls don't know what the temperature is, or there's something wrong with fuel flow.

How about warming up? Does the car lack power when not fully warm? If so I would suspect an air leak (as the other post said) and/or ECT temp sensor signal not right. That is, it could be anything which would not let the fuel mixture get rich enough when cold. Seems like fuel mixture problems would eventually set a code.

Also if you start the car once and DON'T let it warm up, is it easy to restart then? What about performance at full throttle (with engine warm)? These things might suggest the fuel flow is not adequate (fuel pump, dirt in tank?). These issues might not usually set a code.






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