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#3266666 - 02/01/14 09:45 AM Mitsubishi Diamante rough idle
Spetz Offline


Registered: 01/23/14
Posts: 172
Loc: Australia
My 6G74 SOHC Diamante has a really poor idle.

Does so in D, R and to a lesser extent in N.

Things tested to be fine:
O2 Sensor
MAF Sensor
TPS
ECU
ISC (idle speed also fine as per computer data logging)
Engine Mounts

Things replaced:
All spark plugs
Air filter, fuel filter, oil filter and oil
Valve cover gaskets
PCV valve cleaned, TB Cleaned

Symptoms:
Idle gets quite bad after long running times.
At some stage it felt like it idled better after cleaning the PCV and changing rocker cover gaskets but poor idle returned (could have been coincidental).

It feels almost like it sporadically misses and shakes the car.
Drives completely fine and engine is smooth other than at idle.

Any advice would be greatly appreciated.

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#3266678 - 02/01/14 09:57 AM Re: Mitsubishi Diamante rough idle [Re: Spetz]
GumbyJarvis Offline


Registered: 08/23/11
Posts: 1369
Loc: Fort Hood, TX
Coil pack? Maybe coil going
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Pennzoil PurePlus Platinum 0w20 + TOUGH GUARD
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#3268695 - 02/03/14 12:49 AM Re: Mitsubishi Diamante rough idle [Re: GumbyJarvis]
artificialist Offline


Registered: 09/23/07
Posts: 7455
Loc: Florida
Originally Posted By: GumbyJarvis
Coil pack? Maybe coil going

Good point.

Also, back then many Japanese cars had distributors that were a common problem. Discount rebuilds only last 1 year.
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