Starts and shuts down in 2 to 3 sec going crazzy

[beegal3157@gmail.com]

I HAVE A 2003 CHAPARRAL 240 SHGNATURE WITH AN VOLVO PENTA 5.0 GXI-B THE PROBLEM IS I START IT IT RUNS FOR 2 TO 3 SEC THEN CUT OFF, IF WE FORCE TO START IT WITH THE THROTTLE I CAN GOT IT TO RUN AN 1600 RPM AND IT RUN GREAT AS SOON AS I TOUCH THE THODDLE I CUT OUT. WE CHANGE THE DISTRIBUTOR AND ROTOR WE CHECK THE FUEL IT'S OK AND THE PRESSURE IT'S 6O LB ON THE HIGH AND 4- 6 ON THE LOW AND HOLD, WE CHANGED THE THROTTLE POSITION SENSOR AND NO CHANGE, CHECK ALL CONNECTON ON THE ENGINE FUEL TESTED AND IT PERFECTED..... PLEASE NEED SOME HELP.....

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[alldodge]

HOWDY, I mean Howdy (sorry don't mean to shout)

Sounds like you have the classic Idle Air Control (IAC) failure. The IAC controls air flow from idle to 1500 rpm or so. See the link below item 2 - part number 3843750

https://www.marinepartseurope.com/en/volvo-penta-explodedview-7744230-25-5040.aspx

Found one on ebay for about 60

 

[beegal3157@gmail.com]

[FONT=&quot]She a 2003 chaparral 240 Signature Volvo Penta 5.0 gxi-b (300 hours) She starts and then she shuts down after running around 2 to 3 sec, I can force her to run with moving the throttle and get it to run at 1600 rpm for around 15 min, as soon as I touch the throttle she shuts down. This is what I have done so far checked the fuel ok changed the fuel filter and clean the screen changed the throttle sensor changed all the sensor in the cpu changed the oil sensor checked the fuel lines for pressure hi 60 lbs and low 4-6 and holds also changed the distributor cap and rotor and cleaned the sensor under the rotor also changed the air control sensor, checked all the warring from the key switch to the engine. Checking on the firer boy system on the boat if that could shut her down for any reason. Checked the wiring on the tac checked all the wiring on each of the sensors and we are know checking the negative wiring in the harness If any one out there could help me I will take all advice..... Thank you.....[/FONT]

 

[alldodge]

Being that it will run at 1600 rpm and then die if slowed down, its the IAC (Idle Air Control) valve. The IAC Is used from idle to around 1500 rpm to control the rpm. This is classic of what happens when it goes out