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- Mar 8, 2009
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I have a 04 Tahoe Q5 5.7 It has been sitting for about 4 or 5 years with about 100 hours on it. I started digging into it replacing all sorts of things that were not working. starter, battery, trim motor, solenoids, impeller and trim switch. I got it to the point of firing it up but it will not idle. I rebuilt the carb and it still the same. the motor seem to run great when you give it some throttle. I can get it to run at about 1100 to 1200 RPM's but any less it dies. It seem to be dumping to much fuel into the carb and it floods itself out at low RPM's. I have had it idling at 600 to 800 a few times but only for about one minute and it will idle up and die after that. I took the fuel pump and fuel filter off and checked them seems to working fine. not sure what to do please help.
Need to try that rebuild again. Your carb at no time should be dumping or pouring gas into the engine. This is way you can only keep it running if you rev it up. Either your float is sinking, float level is set incorrectly, needle valve is not seating and shutting off the fuel into the bowl when bowl is full. Pull the carb back apart and recheck settings and if it is clean.
Also you did clean/check fuel lines going to carb and replace filters?
To get more input on your issue this should be posted in the Mercruiser I/O section (or other I/O section if it is something else), this is for outboards.
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