Cold start problems

[Tony77]

Hi guys I'm back again I was off cause i was fiting my new setup .. but now im with an issue I wounder if u guys can help . Cold start problems in the morning it never starts first time changed crank sensor still same tried changing fuel same again any ideas please

Sent from my SM-G935F using Tapatalk

 

[S3 Hilife]

Have you scanned for faults with VCDS? Also try disconnecting MAF sensor and also check temperature of CTS is reading correct with VCDS

Steve

 

[Tony77]

Have you scanned for faults with VCDS? Also try disconnecting MAF sensor and also check temperature of CTS is reading correct with VCDS

Steve

Yes bro nothing comes up but i will try to disconnect the maf and see what happens from there cts is new ..cheers even spark plugs was changed

Sent from my SM-G935F using Tapatalk

 

[<tuffty/>]

Might help if you gave a bit more information on the 'new setup' in case there is a hardware change contributing to the problem... can only diagnose based on assumption of a standard car...

<tuffty/>

 

[Tony77]

Might help if you gave a bit more information on the 'new setup' in case there is a hardware change contributing to the problem... can only diagnose based on assumption of a standard car...

<tuffty/>

Tdo5 20g hybrid 640cc injectors.

Sent from my SM-G935F using Tapatalk

 

[<tuffty/>]

First obvious question... is it mapped for this new setup yet?

<tuffty/>

 

[Tony77]

First obvious question... is it mapped for this new setup yet?

<tuffty/>

Yes with 407bhp... will try and start it with Maf unplugged and see what happens

Sent from my SM-G935F using Tapatalk

 

[<tuffty/>]

has it never started properly or just started doing this?

<tuffty/>

 

[Tony77]

has it never started properly or just started doing this?

<tuffty/>

Just on this engine but my old engine never had this issue ... my previous engine I snapped a rod so so this one but since I fitted this one been having this problem and i have no idea what to do now ‍‍‍‍

Sent from my SM-G935F using Tapatalk

 

[S3 Hilife]

So it started doing it straight after swapping the engine? but ran fine with the old engine after your hardware upgrades or was all that done when the engine was swapped?

 

[Tony77]

So it started doing it straight after swapping the engine? but ran fine with the old engine after your hardware upgrades or was all that done when the engine was swapped?

No man we just swaped the engine everything else was and still is same I reackon it's some kind of sensor or maf it can't be the fuel man I dont think anyways

Sent from my SM-G935F using Tapatalk

 

[Tony77]

No man we just swaped the engine everything else was and still is same I reackon it's some kind of sensor or maf it can't be the fuel man I dont think anyways

Sent from my SM-G935F using Tapatalk

Just unplugged the maf still same

Sent from my SM-G935F using Tapatalk

 

[<tuffty/>]

so it was mapped on the previous engine and you built a new one to the same spec with rods?

Have you had a smoke test for leaks?

<tuffty/>

 

[Tony77]

so it was mapped on the previous engine and you built a new one to the same spec with rods?

Have you had a smoke test for leaks?

<tuffty/>

Yes it was ... rods still the original ones .. And no smoke tests

Sent from my SM-G935F using Tapatalk

 

[S3AMJ]

Yes it was ... rods still the original ones .. And no smoke tests

Sent from my SM-G935F using Tapatalk

Let me get this right, you’ve not upgraded the rods on the new engine that you’ve swapped everything over too? And the reason why your old engine failed was because you bent a rod?

 

[Tony77]

Let me get this right, you’ve not upgraded the rods on the new engine that you’ve swapped everything over too? And the reason why your old engine failed was because you bent a rod?

He'll no I bent a rod cause of the ko4

Sent from my SM-G935F using Tapatalk

 

[S3AMJ]

Ahhh right, ok. So this engine is forged then. Ok. Best thing to do is scan with VCDS. Could be a multitude of things, like others have mentioned, faulty MAF, vacuum leak, etc.


Sent from my iPhone using Tapatalk

 

[Tony77]

Ahhh right, ok. So this engine is forged then. Ok. Best thing to do is scan with VCDS. Could be a multitude of things, like others have mentioned, faulty MAF, vacuum leak, etc.


Sent from my iPhone using Tapatalk

Thanks boys

Sent from my SM-G935F using Tapatalk