90 Tohatsu TLDI surging issue

BosGradyWhite

Recruit
Joined
Jul 6, 2017
Messages
1
Hi I was told there was a tohatsu guru or two on here who may be able to help. I have a 90 tohatsu 2004 model TLDI that surges in low RPM.. say in the 600-1000 range. It starts up right away and doesnt seem to be doing it at high rpms at all. But this surging has gotten worse and worse now. I had the motor to a certified tohatsu dealer and they found a beat up air injector wire so that was replaced and a bunch of codes were cleared... after putting load back on the engine it started to act up worse,, however the codes did not come back in..fuel pressure is good, batterries are 1000 cca and new....this engine came off a lake bot and I just installed it on my boat, so it is used but new to me and my boat..looking for advice.. was reading on here a bit.. I did not reset the TPS...but wondering if it needed to be reset if it would throw a code..thank you very much in advance for the advice.
 

Sea Rider

Supreme Mariner
Joined
Sep 20, 2008
Messages
12,345
Welcome to Iboats,

Does the surge continues at idle after OB is sufficiently warmed up ?

Happy Boating
 

pvanv

Admiral
Joined
Apr 20, 2008
Messages
6,500
Always, always reset the TPS initial setting. Then continue with diagnostics.
 
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