Mercury 250 EFI question - TexasBowhunter.com Community Discussion Forums

TxAgHntr · 01-13-2021, 08:48 PM

Question: 2005 Mercury EFI 250

Starting from cold, prime the bulb, turn the key and press in for automatic choke, engine starts up nicely and idles appropriately.

After that, same progression except priming bulb and not pushing in for choke. (I have checked for bulb tight and it has been fine) So just normal cranking after been running around...crank, try’s to start but doesn’t, seems to struggle for gas, so I push neutral button on shifter and push throttle up to give it some gas, it starts and I have to idle it back down and put in gear and runs normal.

Runs normal while running, when stopped and in neutral it seems to run fine until I turn it off...then struggles to start unless I give it some gas...

So cold starts are great, warm engine starts struggle unless give throttle

What gives?

easeup · 01-13-2021, 10:21 PM

idle speed stop just a little too low

TxAgHntr · 01-13-2021, 10:23 PM

Quote:

Originally Posted by easeup

idle speed stop just a little too low

On cold start it cranks up fine and idles fine...

Not arguing, asking...if my idle speed was too low wouldn’t it struggle to start cold too?

Buck hunter332 · 01-13-2021, 10:29 PM

Quote:

Originally Posted by TxAgHntr

On cold start it cranks up fine and idles fine...

Not arguing, asking...if my idle speed was too low wouldn’t it struggle to start cold too?

Not necessarily because I believe when it’s cold it idles higher till it get to temp

TxAgHntr · 01-13-2021, 10:31 PM

Quote:

Originally Posted by Buck hunter332

Not necessarily because I believe when it’s cold it idles higher till it get to temp

Good point. Thanks, I'll look into this.

Buck hunter332 · 01-13-2021, 10:34 PM

A buddy has a rude that dose the same thing starts right up in the am then cranks for what seems like 30 seconds after the Initial start up he just lets it ride tho

TxAgHntr · 01-13-2021, 10:43 PM

Yeah, I've been letting it ride for a few months, just figure I would try to figure it out in the slower season.

Walker · 01-14-2021, 06:30 AM

Try bumping the choke for a warm start.

bossbowman · 01-14-2021, 09:21 AM

I would ask over here, http://www.bbcboards.net/forumdisplay.php?f=8 make sure to include your serial # or they won't respond.

01-13-2021, 08:48 PM	#1
TxAgHntr Ten Point Join Date: Oct 2011 Location: Georgetown Hunt In: Runnels County; Williamson County	Mercury 250 EFI question Question: 2005 Mercury EFI 250 Starting from cold, prime the bulb, turn the key and press in for automatic choke, engine starts up nicely and idles appropriately. After that, same progression except priming bulb and not pushing in for choke. (I have checked for bulb tight and it has been fine) So just normal cranking after been running around...crank, try’s to start but doesn’t, seems to struggle for gas, so I push neutral button on shifter and push throttle up to give it some gas, it starts and I have to idle it back down and put in gear and runs normal. Runs normal while running, when stopped and in neutral it seems to run fine until I turn it off...then struggles to start unless I give it some gas... So cold starts are great, warm engine starts struggle unless give throttle What gives?

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01-13-2021, 10:21 PM	#2
easeup Ten Point Join Date: Oct 2008 Location: Texas	idle speed stop just a little too low

01-13-2021, 10:34 PM	#6
Buck hunter332 Six Point Join Date: Oct 2016 Hunt In: The water	A buddy has a rude that dose the same thing starts right up in the am then cranks for what seems like 30 seconds after the Initial start up he just lets it ride tho

01-13-2021, 10:43 PM	#7
TxAgHntr Ten Point Join Date: Oct 2011 Location: Georgetown Hunt In: Runnels County; Williamson County	Yeah, I've been letting it ride for a few months, just figure I would try to figure it out in the slower season.

01-14-2021, 06:30 AM	#8
Walker Ten Point Join Date: Oct 2006 Location: San Antonio	Try bumping the choke for a warm start.

01-14-2021, 09:21 AM	#9
bossbowman Ten Point Join Date: Aug 2012 Hunt In: Bosque Brown Freestone Hill Navarro Counties	I would ask over here, http://www.bbcboards.net/forumdisplay.php?f=8 make sure to include your serial # or they won't respond.