Hesitation from 'cold' start

[jemi]

I have a 2004 Porsche 996 C4S with Tiptronic and I live in the UAE where the summer temperatures are +40C for 4 to 5 months.

 

When I start the car from 'cold' bearing in mind the car bnever really cools down here even though the car is always parked in a basement car park, after I have engaged drive and started to move forwards, the car sometimes feels like it might stall and has a momentary 'flat spot', after a few minutes the car's fine......

 

I've already changed the MAF, and no difference, could it be spark plugs or ignition coils or a combination of both?

 

Any help would be greatly appreciated

[Darrell]

Try cleaning the throttle body?

[RymerC]

My 2003 does the same thing. Replace the coils/plugs because it was running very poorly in a rainstorm, and it still occasionally misses for a few seconds after startup. Cleaned throttle body, no change. Need to get Durametric or whatever Porsche software on it to see what's out of range during those few moments.

[jemi]

In 40 degree heat and 100% humidity I removed the throttle body off the car.....

 

After a thorough cleaning, I then reinstalled it and sadly it has not made a jot of difference..... :angry:

Edited July 27, 2014 by jemi

[jemi]

Finally got this resolved, new variomatic actuators fitted, no flat spots at all anymore, didn't need to get coil packs replaced or new spark plugs

[AWDGuy]

Was it a diy thing? If so,care to share the procedure?

[jemi]

Nope, both variocam solenoids had to be replaced

[AWDGuy]

which one of these is the solenoid causing the issue of hesitation from cold start?

starting to replace parts and this is one I'll do while it's out.

[jemi]

I have no clue, this does not apprear to be a photo of a Porsche 996 3.6 engine...?

[AWDGuy]

That's from an 02 3.6

[jemi]

This is what the the Variocam solenoid looks like on a Porsche 996:

 

http://rennlist.com/forums/996-forum/651593-wtb-variocam-actuator-and-solenoid.html

 

 

Not sure what they are in your photo

Edited March 9, 2015 by jemi

[Ahsai]

This is what the the Variocam solenoid looks like on a Porsche 996:

 

http://rennlist.com/forums/996-forum/651593-wtb-variocam-actuator-and-solenoid.html

 

 

Not sure what they are in your photo

That's odd. The one in your link is from variocam 3.4L but you said you have an '04, which should be identical to AWDGuy's photo, which is a 3.6L variocam+.

[jemi]

I'll take your word for it, I did not replace my actuators

[AWDGuy]

Yeah. ..was going to say...those pics are a 3.4 for sure. mine are from a 3.6.

Edited March 9, 2015 by AWDGuy

[jemi]

The garage here in Dubai replaced mine

[AWDGuy]

have a close relationship with them? anyway you could ask? would help me out a lot. those sensors are over $200/each here in Canada.

I don't want to buy the wrong one/wrong side.

Edited March 9, 2015 by AWDGuy

[Vltor]

Did anyone ever figure out which vario needs to be replaced for dead spot on start up? I have an 02 that is also doing this.