EFI specs for techmate pro

[further]

Hi all,
2004 5.0gxi-D. Looking for all the specs that I can compare techmate pro output to. Not finding anything in any of the manuals I have. Suggestions?
Thanks

 

[alldodge]

Agree VP doesn't put to many actual values for a given sensor like Merc and Indmar does. The GXI manual list some fuel pressure values and 5V sensor but not a lot more.

They are using mostly GM/Delphi sensors so could use the Merc manual to get some ideas

 

[further]

Thanks for the reply. Would you know what the normal output for the IAC should be? I’m getting 22-25 at idle and 35 at 1500 rpm. Trying to diagnose a hard starting condition when cold. Some photos of the diagnostic info attached

 

[alldodge]

Normal 750 rpm idle the IAC would be 20-40 counts
TPS volts look good
Battery volts (if throttle was bumped to 1500 for a sec) should be reading 14V
Normally if the motor is not in base timing mode the advance will be all over the place but still close to 8*. Was the advance rock steady?

 

[further]

Battery volt goes to 13.6 at 1500 and spark advance goes to 14 and stays there. Idle spark advance is 7. Thought normal idle is 600?

 

[alldodge]

Volts are a bit low, but not bad, as before 14.5V would be normal

Agree 600 normal, I'm use to watching my 509 which is 750. That said your showing 950

Fuel pressure 50 to 60 psi at the rail

When are you getting the hard start?

 

[further]

Sorry pics are out of order and I didn’t include the idle info when I was at idle on the throttle - I’ve attached. The 950 shows “desired idle speed” when I bumped the throttle to 1500 rpms. Not sure why that would be higher when the throttle is bumped. Would think desired idle would always be 600?
Recently replaced the fuel pump with a paint less refurbished assembly and have 50psi on rail and 8psi on low side.
Problem has been ongoing for as long as I can remember (I’ve had the boat for 4 years) but seems to be getting a bit worse every year. Besides the cold start, motor runs great and no issue on starts once it’s warmed up. WOT 4800 rpm at 42mph- 4 blade prop. Gets up on plane super quick with 2 people and my 100lb ridgeback, 3/4 tank of fuel. 24’ Deck boat btw about 5000lbs.
Issue is… every time I get to the boat and fire it up cold, I crank in neutral, it fires up and idles down and stalls, 2nd time same issue… normally the 3rd time it’ll stay running, lately sometimes it takes a 4th attempt. If i put it in fast idle and start it, she’ll fire right up and stay running as long as I don’t bring the throttle back down to idle too quickly and let her warm up a bit. Not a big issue but it just doesn’t seem right and I want it right. Could it be a leaking injector causing a flooding condition?

 

[alldodge]

That sounds like the Engine coolant Temp (ECT) sensor and or the Manifold Air Pressure. You may even have a MAPT (MAP with Temp). When cold the ECT should tell the ECM that its cold and give it more fuel, just like a choke on Carb. When cold the IAC should be allowing more air since there is more fuel but not that much more.

Once it warns up the choke opens or the fuel is leaned because it burns more effectively. The MAP and TPS along with ECT determines how much fuel it gets. Look at the scanner when cold and see what the sensor tells the ECM what the temp is.

 

[further]

Coolant temp read 113 when I first started it up today cold with the scanner connected and MAP volts 1.68. The two screen shots are at idle cold

 

[alldodge]

At 113* the motor things its all warmed up, so its not getting enough fuel

 

[further]

At 113* the motor things its all warmed up, so its not getting enough fuel

Ah ok so sounds like I’m looking at replacing the ECT then…. Thank you for the help alldodge!

 

[further]

Sorry bout all the questions… but confused on which is the proper sensor. Am I looking at 19 or 20. I think 19 is on the tstat housing and 20 is on the exhaust manifolds - one on each side.

 

[alldodge]

It should be 19 because the ECM sensors use a ground wire, where temp gauge sensors use the body as ground

 

[further]

It should be 19 because the ECM sensors use a ground wire, where temp gauge sensors use the body as ground

Thank you!

 

[further]

It should be 19 because the ECM sensors use a ground wire, where temp gauge sensors use the body as ground

Alldodge… replaced the ECM and MAP today and seems to have done the trick. Hooked the Rinda up and temp at startup was high 80’s and idle was better. Real test will be the next time I start cold and hopefully it’ll start up on the first try without stalling. Thanks again