HELP: problem at cold start

[KSA.m6]

Hi everyone,

I recently had a problem with my car and i don't know what is wrong with my baby

At COLD start, after the initial engine crank the RPMs go above 1000 as usual but after that when it starts to come down the revs start going above 1000 and drops to about 500 and back up again. it continues to do that until the engine warms up after a minute or so.

I have tried to clean the air filters, Mass air, added fuel injector cleaner but it's not improving.

No fault codes either

M6 F06 GC, DPs, drop in filters, AKRA exhuast & ESS tune

PLEASE ADVISE

[2007 to 2016 M6 Cab]

Originally Posted by KSA.m6

Hi everyone,

I recently had a problem with my car and i don't know what is wrong with my baby

At COLD start, after the initial engine crank the RPMs go above 1000 as usual but after that when it starts to come down the revs start going above 1000 and drops to about 500 and back up again. it continues to do that until the engine warms up after a minute or so.

I have tried to clean the air filters, Mass air, added fuel injector cleaner but it's not improving.

No fault codes either

M6 F06 GC, DPs, drop in filters, AKRA exhuast & ESS tune

PLEASE ADVISE

I got the same thing occasionally and had what sounds like the same setup with catless down pipes ... the racing idle occurred on cold starts and if I gave it some throttle it went away.

Since I went to dinan stage II it seems to have gone away


I am assuming it has to do with the change in back pressure with the dp and akra and the ECU working with that and the air/fuel mix ... my last M6 cab with the V10 and K&N cold air intakes and the eisenmann cat back did the same thing and it did not have a tune

[KSA.m6]

Originally Posted by 2007 to 2016 M6 Cab

I got the same thing occasionally and had what sounds like the same setup with catless down pipes ... the racing idle occurred on cold starts and if I gave it some throttle it went away.

Since I went to dinan stage II it seems to have gone away


I am assuming it has to do with the change in back pressure with the dp and akra and the ECU working with that and the air/fuel mix ... my last M6 cab with the V10 and K&N cold air intakes and the eisenmann cat back did the same thing and it did not have a tune

If that was the case, why did it just show up now, i had this setup for a while now with no issues...

[1MEANM6]

i got the same thing but not everyday and my car is stock

[speedracerlo]

I get in randomly on colder days. Warm or hot days never. I had it when my car was bone stock so I don't think it's an issue. It will definitely happen when I try to drive before cold start is over.

[2007 to 2016 M6 Cab]

Originally Posted by speedracerlo

I get in randomly on colder days. Warm or hot days never. I had it when my car was bone stock so I don't think it's an issue. It will definitely happen when I try to drive before cold start is over.

very strange from a car development and engineering perspective

[KSA.m6]

Originally Posted by speedracerlo

I get in randomly on colder days. Warm or hot days never. I had it when my car was bone stock so I don't think it's an issue. It will definitely happen when I try to drive before cold start is over.

That was also happening. but I'm mostly concerned about the new issue.

[KSA.m6]

Any more thoughts...

[KSA.m6]

Could it a vacuum leak ?

[KSA.m6]

Can someone tell me how much is the Mass Air reading at idle supposed to be???

someone told me it should be around 17-18
I'm getting 12-13

[nabizzy]

Time to do upgraded turbos, meth, clutches, axels, JB4, backend flash, and intake

F it

LOL

[KSA.m6]

Originally Posted by nabizzy

Time to do upgraded turbos, meth, clutches, axels, JB4, backend flash, and intake

F it

LOL

I holding back the devils inside of me, but I don't know for how long