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 Zuma 155 BBK no cold start. 
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Newb
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Post Zuma 155 BBK no cold start.
Hi Guys,

I have a 09 3500mls 155bbk, cam,SRP 4 hole 140cc injector, rc variator spring,rollers, valves within spec.

will not start in cold morning weather, it seems too be running rich, plug is sparking and soaked

any ideas.

Thanks


Thu Nov 24, 2016 11:15 am
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Posts: 269
Post Re: Zuma 155 BBK no cold start.
Can you charge the battery to full then try to turn it?

how old is the spark plug?

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Thu Nov 24, 2016 1:03 pm
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Post Re: Zuma 155 BBK no cold start.
original fuel pump?


Sun Nov 27, 2016 5:52 pm
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Post Re: Zuma 155 BBK no cold start.
dem50 wrote:
Hi Guys,

I have a 09 3500mls 155bbk, cam,SRP 4 hole 140cc injector, rc variator spring,rollers, valves within spec.

will not start in cold morning weather, it seems too be running rich, plug is sparking and soaked

any ideas.

Thanks


make sure battery is charged and on the battery tender if not used for a week or longer. cold start is the hardest to do and needs a strong battery.

change to new spark plug.

the EFI has a cold start feature where it runs super rich like a choke on a carburator. this makes it worse at cold winter as the colder it gets the ecu will dump more fuel to compensate. so with a strong battery and good spark plug it should turn over and spin freely, takes couple more tries per normal to get it started.

if really cold like snowing outside. can consider going with 5w-40 instead of 10w-40. this helps alot in cold start. the engine can make a complete revolution, easier due to less resistance from the motor oil. but when ambient temps come back up make sure to switch back to 10w-40. 5w-40 don't do well in the summer for these motors.

you can also reset the idle speed control so matches winter conditions better. toggle the key off and on 4x in a row and each position hold for 3 seconds. then start engine and let it idle for 10 minutes. the ecu will recalibrate the idle valve to match the super rich condition in cold winter. sometimes it helps, sometime it doesn't. it's mostly the strong battery issue, i had customer use a battery booster and motor spins faster like normal and fires right up. also need to remember battery in nature drops in performance in cold climate and some even go dormant like shoria.

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Sat Aug 12, 2017 7:25 pm
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