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Old 02-05-2024, 12:52 AM   #1
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Default Engine starting issues

Hi all,

I have an issue with my 350 Mag engine that I was hoping to get some advice:

The issue first occurred a few weeks ago while I was sitting at idle waiting for a pick up. The engine revs started fluctuating. I tried to push the throttle but nothing happened and it then cut out. Trying to start did nothing at all. Gave it some time and changed the battery selector for both to number 2. I also squeezed the fuel prime a couple of times (should have done one or the other). Fired straight back up after that so assumed corrosion in the selector.

Went out the following week and after turning off the engine it wouldnít restart. It would try to turn over but sounded weak. Turning the selector did nothing this time. Jump starter had no effect.
Noticed the battery gauge was reading 10V.


Mechanic has been out to look. Tested batteries and all good. Checked all cables an earths and also good. He managed to get it to fire up after a few tried. Said there was a lot of black smoke when it did but Iím guessing weíd just flooded the engine trying to start?


Anybody had something similar? The low voltage at the gauge is throwing me but not sure if this is normal when not running?
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Old 02-05-2024, 05:17 PM   #2
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There should not be a fuel primer bulb for a I/O, they are only used for outboards.

Being a 350 Mag engine it is fuel injected; correct? You may have an issue with the IAC.
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Old 02-05-2024, 10:32 PM   #3
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Quote:
Originally Posted by mmwjr View Post
There should not be a fuel primer bulb for a I/O, they are only used for outboards.

Being a 350 Mag engine it is fuel injected; correct? You may have an issue with the IAC.
Interesting, it definitely has the bulb.
Yes, itís fuel injection. I did ask the mechanic about the IAC last time as he reckoned it wasnít that but maybe one of the other fuel sensors. Itís the low voltage thatís confusing me.
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Old 02-06-2024, 12:47 AM   #4
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That bulb could be the issue and itís under suction from the fuel pump and can collapse. I recommend it be removed. A MPI system should self prime when the key is turned to the run position prior to rotating to the start position. Did your mechanic try reading for fault codes?
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Old 02-06-2024, 10:49 AM   #5
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Thanks - he didnít mention any error codes but Iíll mention it to him when heís there next
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