Lazy starting rb25det

[jayz706]

Once the car is warmed up it starts ok, however when shes cold shes a B***CH to start.

Any ideas? maybe a the wrong or a bad MAF or something simple like that

[JonPowell]

Temp sensor(2 wire)IAC valve inop/malfunctionAir regulator inop/malfunction

Temp & regulator are most probable.

Timing might be off also.

Could be a dirty MAF too, use electical cleaner to spray down the element inside, DONT USE BRAKE OR CARB CLEANER!

[JonPowell]

Could also be an air leak on your cracked runners???

[jayz706]

Different motor.

[jayz706]

where is the air regulator? Could it be the tps, what should it read across it

[jayz706]

Oh yeah, to make it start when its cold you must touch the throttle.

[JonPowell]

Air regulator is under the intake manifold....

Sounds like IAC or Air regulator, not TPS....sounds like it needs a little more air flow to even out the fuel its getting.

[jayz706]

Air regulator is under the intake manifold....

Sounds like IAC or Air regulator, not TPS....sounds like it needs a little more air flow to even out the fuel its getting.

Is there an adjustment on the air regulator? How should i adjust it

[JonPowell]

Air regulator is NOT adjustable, IAC is adjustable.

Air regulator works off temp

IAC works off a signal from the ECU. What is your idle RPM once the engine warms up? if it is correct then you dont want to adjust this.

Check this out also....

http://club240.com/forums/show...16091

Sounds like same problem, we are trying to trouble shoot over there also.

[jayz706]

T[QUOTE=JonPowell]Air regulator is NOT adjustable, IAC is adjustable.

Air regulator works off temp

IAC works off a signal from the ECU. What is your idle RPM once the engine warms up? if it is correct then you dont want to adjust this.

Check this out also....

http://club240.com/forums/show...16091

Sounds like same problem, we are trying to trouble shoot over there also.[/QUOTEThanks Jon I will try this stuff.

[jayz706]

Looks like we wernt getting a good enough start signal, just for the heck of it we ran a jumper wire from the starter signal( straight from the ignition) to the ecu and it seems to be working great. The big test will be this morning after sitting all night.

[JonPowell]

Any luck?

[jayz706]

Yes its working perfect. Thanks for the help

[eh?]

I have a lazy starting RB25 also. I must crank 4-5 times before it idles. Because of that my starter died. So look out.

[jayz706]

mine starts as soon as turn the key now..

[eh?]

So it was the start signal? Ecu pin 45?

[jayz706]

Cant remember what pin number, but yes it was the start signal causing the car not to start properly.