Lean warm/hot restart

[lostsoul]

When restarting after the engine has reached operating temp it is very lean ( 1.3ish lambda ) for 30 -  60 sec. I have increase the post start enrichment and the post start decay time .... has improved but still about 1.1ish lambda.

Is there anything else I could/should be looking at? 

[Jeffersonc]

Funny, I am having the same issue. Would like to hear what others have to say.

 

Good read here in regards to same problem.
 

 

[Ducie54]

Watch your IAT on a hot restart. If the temp sensor gets heat soak the ecu in modelled mode will pull out fuel. Add fuel to the high temp no throttle area of the iat correction table.

[lostsoul]

Had thought about the IAT correction but thought that should off if using Modeled Fuel Equation ?

[cj]

its off because "sensible" values for IAT fuel enrichment are already used as part of the modelled calculation. 

You *can* turn it on if you have a reason to do something "non-sensible", such as completely opposite of normal like add fuel at high IAT value at specific throttle opening, and just set the majority of the table to 0 except the points you want to change. The modelled fuel behaviour is still going on in the background. Think of it like an additional overlay table which you dont normally need.

[Ken Dunkley]

Hi- My engine suffers badly from heat soak and i have done the same as cj suggested and have managed to get the problem sorted to the point where im happy with it .