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#1
05-24-2012, 07:02 AM
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1997 LT1 starts rough, stalls then fires up perfectly?
I have a 1997 Maristar 225V with the Lt1 w aprox 600hrs. This is my 3rd year owning the boat and it has been absolutely flawless until late last fall. After a session on the river, the boat had sat at the dock for about 30 min after shutting down. Upon restarting to put it on the trailer, it ran very rough and surged in idle up to about 1600 rpm. I gave it some throttle in nuetral and it seemed like it just wouldnt take it and stalled. I refired the engine and it ran instantly perfect once again. This has never happened again until the past weekend.
Same scenario exactly. Engine was hot (160). Boat sat for 30 min or so, then upon restarting to put it on the trailer it ran rough and died. Turned the key to restart after stalling and it ran as perfect as ever. Any thoughts or ideas on this? It almost seems like the feul is vapourizing or a sensor wasnt working for a moment but being completely EFI theres not much I can check when the problem only exists for 15 seconds or so. Thanks in advance... Brent 
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#2
05-24-2012, 07:49 AM
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have you replaced your fuel filters lately?
my LT-1 idled rough, replaced the IAC and idled fine
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#3
05-24-2012, 08:31 AM
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I have a 96 Prostar LT1. If you were in the deep south like me where it gets hot as Hades outside, I would say maybe vapor lock. If we run our boat hard for a while then let it sit baking in the sun with the motor box down, it will spit and sputter and die upon restart. I've had to put a rag over the fuel filter connection before the feul rail, unscrew it and a bunch of feul vapor will come out under pressure. I did this with the blower on and plenty of ventilation....and noone smokes around me. I let it sit for 5 minutes ventilating, then it runs like a champ.
I've learned to use my boat paddle and prop the box open for ventilation while we are off eating or whatever. I doubt in the northeast that is your problem...and I'm no mechanic, just an engineer who likes to try to be. In the deep south of Alabama...it gets pretty warm :-)
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#4
05-24-2012, 09:29 AM
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very similar sounding problems this past year in my 1997 5.7 TBI...Ended up being a filthy fuel tank. If you have not pulled that baby out and looked at it I would. replace the fuel filter a couple of times after you get that tank clean if that is the problem.
__________________
2004 MariStar 230 VRS with X Package Come find us on 'da Bayou
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#5
05-24-2012, 10:40 AM
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Thanks for the replies guys. I should have mentioned I changed both fuel filters after the first time this happened. Probably only put 10 hrs on it since. Might be time to have a look inside that tank.
Odd thing is it starts perfectly and runs without even a sputter just after it stalls out from running so poorly. Almost like shutting off the key and turning it back on has reset something. (no engine light either) I will look into the fuel tank this weekend and grab a new set of filters as well.
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#7
05-24-2012, 05:54 PM
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Quote:
now that I think about it, mine was idling low and often required a little throttle exercise to get it back to normal. R2 the IAC and it was smooth sailing ever since, may or may not be your problem. good luck
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#8
05-24-2012, 10:16 PM
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IAC is idle air control valve?
In the auto world, they usually fail open and then give you trouble when it is cold outside by allowing in too much cold air in the engine at idle. Does it operate different in a boat?
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#9
05-26-2012, 05:14 PM
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Last year, upon start up on my lt-1 it would idle right around 1500 rpm and then settle down, i replaced the IAC on the throttle body and it solved the problem it was worn at the end.
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#10
05-26-2012, 07:52 PM
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Quote:
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