98 502mag mpi surging

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06-02-2015 | 05:10 PM

#11

BUP

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Joined: Jul 2011

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From: Ft. Worth TX

I know every darn SB that Mercruiser put out in the last 40 years

A possible good read for whomever

http://www.marinemechanic.com/merc/d...umptesting.PDF

06-02-2015 | 05:21 PM

#12

BUP

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Joined: Jul 2011

Posts: 9,594

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From: Ft. Worth TX

and another good read for whomever

http://www.boatfix.com/merc/Bullet/99/99_07.pdf

06-02-2015 | 05:42 PM

#13

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Joined: Nov 2004

Posts: 14,090

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From: On A Dirt Floor

Pretty close description of a partially clogged clogged ca t ! LOL.

Get ready for this to happen soon....on these forums.

06-02-2015 | 06:20 PM

#14

Kaama302

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Joined: Nov 2011

Posts: 111

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From: Beverly Farms, MA

Quote:

Originally Posted by 33outlawsst

what Im saying is put a gauge on it and watch it as it starts surging, is that what you did, it has the smell of vapor lock to me, u turn it off, cools down, runs fine, till it heats back up, or did I miss something

Yeah, If I back the throttles down to 2500rpm it runs fine and will bot miss a beat. Bring it back up and it starts surging.