SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: Ckaz21 on March 08, 2015, 08:18:20 PM

Title: Idle Issue?!!
Post by: Ckaz21 on March 08, 2015, 08:18:20 PM

454. Mild build-049 heads 278 xtreme marine cam. 10.5 compression, New 850DP Holley as of last July. Toward the end of the season I started noticing the idle getting worse and worse, didn't look into it cause I didn't want to bother at the time.

Took it out today and it kept dying after I would slowly left off the gas after cruising. Other thing it does is when it idles it does so sporadically, every time I start it, it will idle at a different rpm and sound different. If I give it gas real quick it will hesitate and cut out.

I'm thinking its a vacuum leak..any other ideas?

Thanks 

Title: Re: Idle Issue?!!
Post by: crewchief22 on March 08, 2015, 08:22:16 PM

Vacuum leak is a good place to start looking.  What distributor do you have?  Inspect it to make sure the advance mechanism isn't binding up.

Title: Re: Idle Issue?!!
Post by: Ckaz21 on March 08, 2015, 08:29:33 PM

MSD Streetfire HEI. I know its not the best but the weight don't seem to bind at all every time I test them.

Title: Re: Idle Issue?!!
Post by: jyeager on March 08, 2015, 10:21:03 PM

Quote from: crewchief22 on March 08, 2015, 08:22:16 PM

Vacuum leak is a good place to start looking.  What distributor do you have?  Inspect it to make sure the advance mechanism isn't binding up.

X 2 👍👍👍👍


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Title: Re: Idle Issue?!!
Post by: SS-201 on March 08, 2015, 11:36:32 PM

Spray and  even sure your air bleeds are clear

Title: Re: Idle Issue?!!
Post by: aquaholic72 on March 08, 2015, 11:43:07 PM

X2 make sure air bleeds are clean.. alil chunk of poop can cause havock

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Title: Re: Idle Issue?!!
Post by: JBASHAM on March 09, 2015, 01:30:43 PM

Quote from: Ckaz21 on March 08, 2015, 08:18:20 PM

If I give it gas real quick it will hesitate and cut out.

I'm thinking its a vacuum leak..any other ideas?

Thanks

Check the accelerator pumps.


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Title: Re: Idle Issue?!!
Post by: Ckaz21 on March 09, 2015, 01:36:29 PM

What exactly do you suggest checking on the pumps?

Title: Re: Idle Issue?!!
Post by: JBASHAM on March 09, 2015, 09:50:47 PM

Make sure they're both squirting properly.. If not, that would definitely cause your hesitation on acceleration


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