Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

2003 Mitsubishi Diamante Rough Idle

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8 years 4 months ago #20335 by Spetz
2003 Mitsubishi Diamante Rough Idle was created by Spetz
Hi everyone,

I have a 2003 Mitsubishi Diamante with a poor idle.
It is non-rythmic and at times idles smooth, at times really bad and most of the time just bad.

I have checked all the sensors, compression test, injectors replaced, idle RPM is steady, vacuum test, air leak test done etc

Took it to 2 mechanics who cannot diagnose it.

Changed plugs, leads, distributor, distributor cap, rotor, all filters etc.

PVC system is OK.

O2 sensor will be replaced soon but just hoping someone can suggest something?

It seems to be a common issue with these cars not idling well but no one knows the answer

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8 years 4 months ago #20336 by cheryl hartkorn
Replied by cheryl hartkorn on topic 2003 Mitsubishi Diamante Rough Idle
sticking open egr valve?

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8 years 4 months ago #20341 by Spetz
Replied by Spetz on topic 2003 Mitsubishi Diamante Rough Idle
I put a blanking plate on the EGR port and it made no difference.

Also when the hose is pulled off of the EGR solenoid and a vacuum pump the idle gets much worse so the valve seems operational

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8 years 4 months ago #20343 by kekekekevin95831
Replied by kekekekevin95831 on topic 2003 Mitsubishi Diamante Rough Idle
I just done diagnosing a 03 Mit Lancer with randon rough idle. In my case it was a faulty MAF that’ll drop out its signal intermittently. So check the MAF and Iac too. Hope this helps

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