air flow sensor pcmgt40

Postby Gilflight23 » Wed Jan 02, 2019 2:12 pm

hey guys trying to locate the air flow sensor on my sport naut wondering if anyone knows where to look cheers
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Re: air flow sensor pcmgt40

Postby lewy71 » Thu Jan 03, 2019 6:56 am

No MAF (Mass Air Flow) sensor on the GT40 only MAP (Manifold Absolute Pressure)
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Re: air flow sensor pcmgt40

Postby Gilflight23 » Thu Jan 03, 2019 8:05 am

Thanks heaps mate
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Re: air flow sensor pcmgt40

Postby lewy71 » Thu Jan 03, 2019 9:05 am

No worries here is some more part identifying for the GT40
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Re: air flow sensor pcmgt40

Postby Gilflight23 » Thu Jan 03, 2019 5:07 pm

cheers mate really appreciate it
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Re: air flow sensor pcmgt40

Postby Gilflight23 » Mon Feb 04, 2019 1:26 pm

Can I clean it ? I've got it off but can't get into it
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Re: air flow sensor pcmgt40

Postby lewy71 » Mon Feb 04, 2019 3:25 pm

They are a sealed unit and they work a bit different to the current MAP sensors. They produce a frequency signal to return to the ECM instead of signal voltage.
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Re: air flow sensor pcmgt40

Postby Gilflight23 » Mon Feb 04, 2019 4:55 pm

ill just replace I believe that's the source of my problem cheers mate
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Re: air flow sensor pcmgt40

Postby lewy71 » Mon Feb 04, 2019 6:50 pm

What problems are you having ??
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Re: air flow sensor pcmgt40

Postby Gilflight23 » Mon Feb 04, 2019 9:16 pm

All the home work I've done it seem to say that its the map sensor it's blowing smoke once it warms up it's hesitating loosing power under load drinking lots of fuel
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Re: air flow sensor pcmgt40

Postby lewy71 » Tue Feb 05, 2019 7:28 am

Running rich when at running temps could because the computer may still think it is cold and is supplying more fuel required thinking it is still in warm up cycle. Just like having the choke on with a carby.
Do not rule out the ECT and ACT sensors.
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Re: air flow sensor pcmgt40

Postby Gilflight23 » Tue Feb 05, 2019 7:53 am

thanks mate the good old process of elimination haha hopefully sort it out soon keen to ride
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Re: air flow sensor pcmgt40

Postby Gilflight23 » Tue Feb 05, 2019 8:01 am

I'm abit of a noob when it comes to this stuff are they hard to replace or get replacement parts for the act and ect
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Re: air flow sensor pcmgt40

Postby Gilflight23 » Tue Feb 05, 2019 8:18 am

would explain why the boats going into limp mode
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Re: air flow sensor pcmgt40

Postby lewy71 » Wed Feb 06, 2019 7:32 am

Limp mode is a different thing. On the GT40 they call it slow mode there is two switches separate to the temperature sender and oil pressure sensors that activates slow mode. The GT40 also have knock sensors but they are only used to retard the timing. You can isolate a faulty switch by just removing the wire from the switch.
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Re: air flow sensor pcmgt40

Postby Gilflight23 » Wed Feb 06, 2019 9:12 pm

wow thanks mate I will see if I can work this out
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Re: air flow sensor pcmgt40

Postby Gilflight23 » Wed Feb 06, 2019 9:27 pm

are these switches hard to find sorry to be a pain and I really appreciate your help
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Re: air flow sensor pcmgt40

Postby lewy71 » Thu Feb 07, 2019 7:24 am

Look for the tan coloured wire on the switch. My boat has a shower and heater so some of the cooling houses are a bit different.
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Re: air flow sensor pcmgt40

Postby Gilflight23 » Thu Feb 07, 2019 8:06 am

thanks so much your a champ really appreciate all your help doing testing today will let you no
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Re: air flow sensor pcmgt40

Postby Gilflight23 » Thu Feb 07, 2019 8:41 am

so if I disconnect one at a time see if that eliminates the problem ill take it out on the water only way to really test
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