225 Pro Max Cranking Problem

[jay j]

When Motor Is Cool(1st Crank Of The Day Or After 2-3 Hours Sitting) It Will Not Take Gas It Will Idle But A Little Low And Sometimes Shut Off But I Have To Feather The Pedal To Get The Rpm Up. This Might Take 30 Seconds To Maybe A Minute . After That It Runs Great Idles Great. When It Does This And I Give It A Little Gas You Can Hear The The Extra Air Going To It But It Is Like The Timing Is Not Coming With It. I Just Rebuilt It And Left The Advance Module On It, But It Did This Same Thing Before I Went Thru It. I Can Get Another Advance Module To Plug In And Check Or Do You Think It Could Be In The Map Sensor Or The Block Temp Sensor?
Any Way To Check? On Another Motor I Used To Run A 470ohm Resisitor Between The Block Sensor With A Switch So I Could Fool The Box By Telling It It Was Already Hot But Needed The Switch To
Get The 30% Enrichment To Crank. It Does Not Act Lean But I Do Not Know.

[David L]

Sounds like the throttle position sensor is out of adjustment.

disconnected the two (bullet connectors) port temp sensor wires. With the key switch on, throttle arm at rest position (idle) the voltage between the orange and blue wire on the TPS (wire color needs to be confirmed) should be 0.250-0.280 volts.

My once upon a time my PM had the same cold start symptoms. The TPS then showed about 0.010 volts.

I re-adjusted the TPS to spec and life was good.

[Jay Smith]

I'm with David , TPS out of adjustment.........

good luck,

[sosmerc]

It does sound like the tps needs to be set richer (higher voltage reading). Have also seen a few bad temp sensors...and they combine with the tps on the same circuit to signal ecu for more or less fuel. (disconnecting the temp sensor makes it go 40% richer) If it runs a whole lot better with the temp sensor disconnected, then you are running too lean.