Hi people I'm new here and new to my boats.
I have searched hi and low on the discussions and cannot find my problem.
I have a 1997 sport nautique with gt40 351w and since I've bought it it has given me these problems.
number 1 is it starts fine cold but does have a rough idle seems to surge a little until it pans out with a slight rough idle then when ive run it for a while and it it at operating temp it is hard to start and once it does start it surges badly unless I give it some throttle and then it goes away and will run fine.
number 2 is it will rev out to 4800rpm some days then others 4500rpm and the other day it would only rev to 4000rpm seems to have the power each day but not the revs each day.
I have run the scan tool with engine off and it passes but then when I run the scan with engine on it will initially rev up to 1200rpm for a while then dies and stays at code 12 which means idle out of range high. I'm not exactly sure but I'm thinking it could be idle air control, map sensor or throttle position sensor?
any help would be greatly appreciated. Thanks in advance
I have searched hi and low on the discussions and cannot find my problem.
I have a 1997 sport nautique with gt40 351w and since I've bought it it has given me these problems.
number 1 is it starts fine cold but does have a rough idle seems to surge a little until it pans out with a slight rough idle then when ive run it for a while and it it at operating temp it is hard to start and once it does start it surges badly unless I give it some throttle and then it goes away and will run fine.
number 2 is it will rev out to 4800rpm some days then others 4500rpm and the other day it would only rev to 4000rpm seems to have the power each day but not the revs each day.
I have run the scan tool with engine off and it passes but then when I run the scan with engine on it will initially rev up to 1200rpm for a while then dies and stays at code 12 which means idle out of range high. I'm not exactly sure but I'm thinking it could be idle air control, map sensor or throttle position sensor?
any help would be greatly appreciated. Thanks in advance
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