slow to reach 3000 rpm

clasavi

Petty Officer 2nd Class
Joined
Mar 8, 2010
Messages
119
1998 mercuries 350 EFI MPI
Engine Serial OL067176
Sterndrive OL153367

On the water today, the boat was slow to reach 3000 rpms from WOT but thereafter the rpms climb was normal. she topped at 4800 rpm but I think it should have been in the 5200 rpms range.

on a another note, she couldn't keep RPMS at a steady rate for example when I set the speed/throttle to approximately 3400 rpms she slowly decreased to 3000 rpms.

all plugs, wires, distributor cap and rotor are new as well as the TPS.

I have recently set the timing. could it be timing?
 

TheHunter990

Seaman Apprentice
Joined
May 27, 2012
Messages
41
Re: slow to reach 3000 rpm

Recheck your timing. What did you set it too?

You could have bad gas, or low fuel pressure (bad pump).

Did your problems start after you install the new plugs, wires, etc? Sometimes the plug gap can be VERY off from what it should be. (.035" normally).

Did you setup the new TPS sensor correctly? Not sure on the spec, but it will need a certain voltage at idle or wot.
 
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