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


Registered: 01/23/14
Posts: 267
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.
_________________________
2003 Mitsubishi Diamante 6G74 3.5L. 5 Speed auto. 141,000 miles. Shell Helix Ultra 5W40 at 6k OCI

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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: 1700
Loc: Killeen, TX
Coil pack? Maybe coil going
_________________________
16 Hyundai Veloster Turbo 1.6L 9k
Royal Purple 5w30 + OEM

05 Ford Ranger 2.3L 247k
QS Defy 10w40 + STP Blue

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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: 8382
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.
_________________________
2010 Lancer Ralliart Sportback

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