MAP (MAPT) Sensor

Why are you asking? Are your engines throwing codes?

Never had a problem with the MAP sensor on either engine in the boat. Never had a problem with a MAP sensor on any of the cars. They are very robust little devices!
 
Have not had codes checked, but do have issue that I'm trying to resolve.
Engine runs rough after starting ( starts normal) almost wants to stall ( shakes ) If given little throttle it runs smooth with no upper end issues. Will resolve after warm up period.
Have all new plugs, rotor, cap and wires. Recently replaced injectors because of CF3 issue with paint. New CF3 unit and IAC
Feel like i's a sensor issue when cold, I also smell gas in water exhaust only when I have the rough idle. After warm up, no smell gas and engine runs fine
Any help would be appreciated
Rich
 
Sounds like the EFI is doing too much cold engine enrichment or it's too lean a mixture to fire when cold You need to connect a scanner to see if and why it's excessively rich or lean. Other than that, was the fuel system and rail flushed following the replacement of the cool fuel module? If the fuel system wasn't flushed, the new injectors could be partially clogged resulting in a lean condition that's too lean to fire reliably cold, but will fire when hot. The downside of that is under a load, too lean can cause internal engine damage. So you need to find the problem, soon.
 
the 'engine coolant temp' (ECT) sensor is considered to be the prominent sensor.....it tells the ECU when the coolant reaches normal operating temp so that the ECU can go into 'closed loop' mode meaning it will use inputs from all of the sensors to effectively and efficiently manage the air/fuel ratio and ignition timing to maximize engine performance...if the ECT sensor is faulty the ECU cannot manage these things properly and the engine may never go into closed loop mode and may be wasting fuel and cause rough idling......

cliff
 
I don't believe that a 2005 has catalytic converters nor lambda sensors. Without lambda sensors it cannot go closed loop. Furthermore, once the lambda sensor starts showing a signal, the PCM switches to closed loop mode.

I'm pretty sure that his problem isn't the ECT.
 
Sounds like one of the plugs isn’t firing for some reason when cold, that’s why you see/smell gasoline in the exhaust.

I would remove all spark plugs immediately after a cold start. Don’t Let it run long enough to smooth out. Look for the wet plug that smells like gasoline.

If it’s a middle cylinder right under one of the risers, I’d also be concerned about the condition of the manifolds and risers, possible water leaking in.
 
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