Can't get '06 GTO to start on key only.

[Johnyhotrod]

This is a heads/cam (238/242 duration) car. I upped idle speed to 825rpm at warm idle areas.... too much less, and the car would set misfire codes and map out of range errors

I cranked the crank airflow to max values to try and get it to start, I upped the Park position minimum idle airflow column to match actual running airflow (15 g/s).

I zerod out the flare control spark table.

I upped cranking timing.

None of this made a difference imho. I still have to go at least 1/4 throttle to get it to start.

Also, there is a long delay before it will idle upto commanded idle speed...

Any suggestions?

[MyM8V8]

Have you drilled the butterfly? (throttle body blade)

[Johnyhotrod]

Have you drilled the butterfly? (throttle body blade)

Hahahaha... no. Shit, we used to do that back in the 80's. You mean we still have to?

[MyM8V8]

Don't laugh!!! It worked for me! I just drilled a 4mm hole and all the problems I was having went away.

[Johnyhotrod]

Don't laugh!!! It worked for me! I just drilled a 4mm hole and all the problems I was having went away.

Thought about that when i could not get the betterfly to open over 20%...

[Highlander]

Do not drill the TB hole.. your's is drive by wire and you can tune it out...

[MyM8V8]

Do not drill the TB hole.. your's is drive by wire and you can tune it out...

So is mine. I spent forever trying to tune it out until some one told me to drill it, and hey presto, it worked. (I did port the TB at the same time but i doubt the porting had anything to do with it)

Any chance of a to do list for an E40 dbw?

Oh, btw, mine idles nice now at 650 .

[jfpilla]

If when porting the TB the ridge was touched it will create some startup and/or idle issues.

If you have not done so, try reducing your VE's.

1200 rpms (-10%), 800 (-20%), 400 (-30%).

[MyM8V8]

If when porting the TB the ridge was touched it will create some startup and/or idle issues.

If you have not done so, try reducing your VE's.

1200 rpms (-10%), 800 (-20%), 400 (-30%).

Cheers. I did pretty much try everything before drilling.

I was very careful not to disturb the ridge as I thought it could create issues. But I had the idle problems way before I decided to drill. I ported and polished the TB when it was off for drilling, not before.

[jfpilla]

Cheers. I did pretty much try everything before drilling.

I was very careful not to disturb the ridge as I thought it could create issues. But I had the idle problems way before I decided to drill. I ported and polished the TB when it was off for drilling, not before.

I should have been more clear. I was responding to the original poster. He should try this before putting a hole in his TB.