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Massimo msu 400efi intermittent problem

Samuel Girten
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Samuel Girten Rookie

Samuel Girten

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Posted

So I have a msu400 efi. Ran fine, pulled it into the shop to do my typical routine maintenance, cleaned air filter, change oil, etc. 

So now it won't run right. Starts and idles, stumbles on acceleration. If I baby it I can get it moving, but dies after a few hundred feet and then is hard to start. Will start back and idle just fine as long as you don't rev it up. 

So what I've done so far.

Verified fuel pressure at injector, never losing it. (54psi)

replaced fuel injector. Verified spark right after dying (sparking like hell)

checked valves. ( Proper clearance) replaced map sensor, idle control sensor, and tps. (No change)

disconnected negative battery cable for 20mins (no change)

checked exhaust, (free and clear) 

Checked air filter again and intake tube (all good)

After it dies or if I just let it sit before starting it, it throws code 113, which I've seen is IAT voltage too high or open circuit. I have a 4 wire sensor and am not sure the wiring back to the ecm nor can find a good diagram. Not even sure if this is a problem or just a code it would throw if it is just not running. 

Any help would be appreciated 

ElbowRoom Rookie

ElbowRoom

Posted
Posted

My bet is also on loose or corroded ground. Why did you change both headlights? Did both go out at the same time? That's unlikely. This again sounds like possible loose connection or ground.

motojoe Explorer

motojoe

Posted
Posted

It sounds like your "Low Oil" switch is not working right and is sending a message to the ECU that it is low on oil.  Check all the connections especially the one that connects to the oil sending unit.

 

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