2007 3.0 mercruiser problem

[boydog40]

my 3lt mercruiser is acting up, it will crank right up and idle but soon as I put it in gear and try to throttle up it dies, cranks right back up and does the same thing. this carb does not have a choke, so does it have a TPS? could that be it? fuel is fresh, not sure what else to check.
thanks

 

[alldodge]

my 3lt mercruiser is acting up, it will crank right up and idle but soon as I put it in gear and try to throttle up it dies, cranks right back up and does the same thing. this carb does not have a choke, so does it have a TPS? could that be it? fuel is fresh, not sure what else to check.
thanks

Could use a bit more info, what is your serial number?
With a carb there wouldn't be a TPS. What RPM is the motor idling at? Have there been any other issues with the motor.

 

[Fun Times]

Being a 2007, the carb is called TKS. The below quote is some general information about how it works.

Being a 3.0l you may or may not have the mercruiser water separating fuel filter system which would of made checking the fuel condition for water or debris a bit easier on you. Guessing without your engine serial number your original fuel filter should be item number 22 which would be found inside item #15, http://www.mercruiserparts.com/Show...g&inbr=11669&bnbr=60&bdesc=Fuel+Supply+System

Turn Key Start: Theory of Operation
The TKS system has been added to carbureted engines to:
? Provide additional fuel to air mixture when starting a cold engine. Idle speed is slightly
increased by supplying the additional fuel / air mixture required to start a cold engine.
? Prevent enrichment when starting a warm engine.
COMPONENTS
1. The TKS carburetor casting allows starting fuel to be drawn from the float bowl and
mixed with air in a chamber. This enriched mixture is drawn into the engine through an
opening in the carburetor body below the throttle plate.
2. The TKS module mounted to the carburetor. When 12V DC is applied, the TKS module
will warm internally, causing a plunger to extend from the module and close the
enrichment fuel air passage in the TKS carburetor.
3. On 3.0L engines, an oil pressure switchprovides a ground (-) path for the TKS module.
Positive (+) voltage is continuously supplied through a 20 amp fuse directly from the
engine circuit breaker.
4. On V-6 and V-8 engines an existing oil pressure switch provides 12V positive (+)
voltage to the TKS module. Ground for the TKS module is continuously supplied.
TKS SYSTEM OPERATION
The TKS Carburetor assembly provides precise fuel and air delivery during startup for all
temperature conditions. An electrothermal valve, the TKS module, is installed on the
carburetor assembly.
Before startup and according to ambient temperature, the TKS Module brass sleeve
retracts, and the enrichment fuel and air valve is opened.
The TKS fuel / air passage is normally open, allowing fuel enrichment mixture through the
carburetor continuously, unless the passage is blocked by the plunger of the TKS module.
With the key switch in the start position, the vacuum of the engine pulls the enrichment fuel
and air into the intake manifold.This starts an electrical warming of the module.
With the circuit completed, the electrothermal TKS module brass plunger extends to block
the enrichment passage.
Once the TKS module brass sleeve is fully extended, the enrichment fuel and valve are
fully closed, and enrichment stops.
In order to keep the TKS module warming and the starting channel in the carburetor closed
when engine is warm a second circuit has been added. For additional information, see the
"Typical Starting System Components" in Section 4A for your particular engine type.

 

[boydog40]

exactly what mine is the TKS carb. the fuel filter is a small filter directly in front of the fuel line inlet, it was clean as new.i have noticed that sometimes it will crank and run perfect, then other times it will crank and not accept any fuel/throttle while in gear, I can give it all the throttle I want in neutral without hesitation. looking at the carb diagram what is the "module" right to the left of the fuel inlet? it is electrical, what does it control?

 

[Fun Times]

That's part of the enrichment module system.

Be sure to search online 'mercruiser service manual 41 that covers the TKS carb.

 

[boydog40]

found that manual, it states that enrichment module to be the TKS module, could that be the problem?

 

[Bondo]

i have noticed that sometimes it will crank and run perfect, then other times it will crank and not accept any fuel/throttle while in gear, I can give it all the throttle I want in neutral without hesitation.

Ayuh,.... Bein' 9 years old,.... Check the lower shift cable, at the shift plate, 'n see if it's draggin', triggerin' the interrupt switch,....

If the cable has never been changed, it way over due,.....

 

[Rick Stephens]

Ayuh,.... Bein' 9 years old,.... Check the lower shift cable.

Zactly.

 

[perna00]

Check the linkage on the top/side of the engine that connects the interupter with the throttle. I have a 2007 3.0 tks and the plastic clips that holds them together came apart and separated from the top plastic sleeve. It might be a common problem with that series.