lOW COLD IDLE 2.3

[MB Nebrasaka]

Hi guys have bought a 92 190E 2.3 that has a low idle when cold about 450-500rpms then warm 600-700.Whats the things needed to be checked out?

Thanks

[riorust]

The cold start valve ?

[MB Nebrasaka]

Will try the cold start valve next!

Thanks

[wbain5280]

Forget the cold start valve, it does what its name implies. Its controlled by the fuel pump relay.

Check the idle air bypass valve, it's cylindrical with two hoses and a two pin electrical connector. Make sure it's clean inside. The engine temp sensor also needs to be checked. Its controlled by the idle speed stabilization control unit. It gets a temperature signal from the ECU and that signal is also sent to the FPR.

Get the repair CD's and check the schematics.