Mercruiser 4.2 D tronic

[IWA]

Can anyone help , I'm having issues with the engine , it starts and runs well , revs clean and freely until its under load , when under load will only rev to 1100 rpm with an amount of black smoke , new turbo has been fitted which has been checked and is fine , waste gate valve has been removed ,refurbished and refitted all good , injectors seem good, i'm now looking at the ECM , does anyone have a diagnostic tool or could point me in the direction of someone that could help , boat is in Windermere

 

[Mike k]

if memory serves this is the diagnostic tool

Rinda Technologies - MerCruiser Scan Tool Spec.

I have the same engine so interested in the outcome.

 

[IWA]

if memory serves this is the diagnostic tool

Rinda Technologies - MerCruiser Scan Tool Spec.

I have the same engine so interested in the outcome.

That is one of the tools , i have been surprised how few " specialists" have one , in fact i haven't found one yet despite asking several

 

[Fishtigua]

Those Scan Tools are pretty good at spotting a duff sensor.

 

[spannerman]

Could be the MAP sensor, if you can get a scan tool and read off the live data and see what air temp and boost it is reading from the MAP sensor. They have a habit of telling lies which affects performance, the ECU rarely is a problem on these engines, its always something external.

 

[IWA]

Could be the MAP sensor, if you can get a scan tool and read off the live data and see what air temp and boost it is reading from the MAP sensor. They have a habit of telling lies which affects performance, the ECU rarely is a problem on these engines, its always something external.

The Map sensor was going to be my next item , I can't get a scan tool at the moment, I am debating if I should simply just replace the sensor ( assuming its a simple as just fitting a new one ) and see if that does the trick , started the engine today which was the first time in eight weeks , fired immediately and ran well , the issue is only under load

 

[spannerman]

Its held on with two 8 mm bolts halfway along the intercooler, plug and play. I love these engines they always start first time.

 

[IWA]

Its held on with two 8 mm bolts halfway along the intercooler, plug and play. I love these engines they always start first time.

Ordered a new MAP sensor today , coming from VM in Italy via a specialist in Chesterfield , 7 to 10 days delivery , took the engine number from the block adjacent the lift pump to get the correct component , I didn't know this is where the correct id was until today

 

[Kawasaki]

Checked you haven’t got diesel bug/ contamination?

 

[Mike k]

could you share the specialists contact details pls

 

[IWA]

Checked you haven’t got diesel bug/ contamination?

No I haven't , the only reason being it runs perfectly until in gear , filled up with new fuel recently but it wouldn't do any harm to check the filters etc

 

[IWA]

could you share the specialists contact details pls

Mike
VM Diesel specialists ltd
Chesterfield
01246 367028 George
www.vmdieselspecialist.com

 

[Mike k]

​

this is another stockist for info Diesel Engine Spare Parts In UK by JNL Engineering

 

[DAKA]

, I can't get a scan tool at the moment,

If its 1993 - 2010 ish the scan tool is basic
You can use a home made Blink tester with an LED and 9 v battery
count the blinks and check the codes

Google Blink tester for mercruiser or (VM 706LX depending on your engine)

 

[IWA]

If its 1993 - 2010 ish the scan tool is basic
You can use a home made Blink tester with an LED and 9 v battery
count the blinks and check the codes

Google Blink tester for mercruiser or (VM 706LX depending on your engine)

Thanks I will look into doing this

 

[Mike k]

good to

If its 1993 - 2010 ish the scan tool is basic
You can use a home made Blink tester with an LED and 9 v battery
count the blinks and check the codes

Google Blink tester for mercruiser or (VM 706LX depending on your engine)

good to see you back pete