1996 5.8 ltr volvo wot to safe mode issue

rsdshoreman

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Aug 6, 2014
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1
i have 1996 chris craft 23' concept with a 5.8 ltr efi engine/DP and when it's running wot it only runs for a couple of minutes starts surging and returns to 2,700 rpm ( safe mode?) and you can maybe sneak it up to 3,000 rpm. surges at idle lately.. i've replaced both fuel pumps/ ran it on a separate tank, clean the reservoir / changed the eca / coil/pu/cap/rotor/wires/ing module/maf/. boat did get wet 2 yrs ago, partial submersion. any help would be appreciated.
 

Walt T

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Joined
Mar 16, 2002
Messages
1,369
Check fuel pressure at idle and that speed. You may have a bad fuel pressure regulator.If water got into the fuel tank and then found its way into the EFI fuel rail andd injection system then there is rust in there. Regulator is first affected. You say it is a 5.8 efi but I dont have anything that show efi on those, just carburetors so I'm basing this on the 5.7 efis.
 

Walt T

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Joined
Mar 16, 2002
Messages
1,369
Point is still the same. You said it got partial submersion....
 
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