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Old 06-28-2020, 11:40 AM   #1
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Default strange idling problem

I have just bought a 1998 Maxum 2300 with 5.7 TBI mercruiser. It always starts easily but sometimes it imediatly cuts out, if i keep it running on the throttle it will rev fine but then wont idle most of the time .
It had code 21, 22 and 34 TPI high voltage, TBI low voltage and Map sensor low voltage . when I got it the idle was very high and rough , I found the ground and signal wires to the TPI were cut . after repairing it now has this slow idle cutting out problem.
I have cleared the fault codes and they have not come back, the previous owner fitted a new TPI and IAC .
When it does idle ok after a while the IAC starts to hiss loudly and with the flame arrestor off it can be seen to be opening up more, Is this the ECM trying to save the engine stopping because of another fault ? there is a steady spray from the injectors at all times , I picks up very well with no hesitation when the throttle is snapped open.

Any ideas please ?
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Old 06-28-2020, 12:07 PM   #2
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Welcome aboard!

Under Documents of this site you can find Mercruiser manual #24 which has a troubleshooting guide for fuel injection systems.
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Old 06-29-2020, 05:49 PM   #3
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Quote:
Originally Posted by mmwjr View Post
Welcome aboard!

Under Documents of this site you can find Mercruiser manual #24 which has a troubleshooting guide for fuel injection systems.
Thank you for the welcome ! I have downloaded the manual already and been through every dignostic check . I dont have access to a scanner as in Thailand but I have found a way to read and clear fault codes.

It is not throwing up any fault codes now .
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Old 06-29-2020, 06:02 PM   #4
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I would replace the IAC again. They are know to be bad right out of the box sometimes.
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Old 06-30-2020, 12:20 AM   #5
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I would replace the IAC again. They are know to be bad right out of the box sometimes.
Use a OEM IAC folks have had issues with others.
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