Rough cold start idle

[a9entjones]

Originally Posted by Tonrogs

Small update.
Primary o2 has been swapped.
Cam sensors have all been swapped.
Issue remains.

Hi Tonrogs...

Wondering if you made any progress with this? I'm running a Sprintex 210 supercharger, ID1050x, DW300c on E85 and am having exactly the same issue on Ecutek. After one day of sitting, car is a pig to start.

Cheers....

[Grady]

Originally Posted by Tonrogs

The built engine had this poor idle since the first start after I swapped it in. The turbo was installed at the same time as the built engine.

When you say built did they change the CR? low compression, E85 and cold are not good combinations.

[naviuk]

Originally Posted by steve99

Car starts on port injection only then it runs on port injection only for first minute or two.


Then it runs whats in the pi\di ratio tables


Im guessing that you have bigger port injectors. If these are scaled badly or injectpr latency is set up badly car will often idle rough for first couple of minutes till di injection stsrt being used as a lot of tuners run 100% di injection in po\di tables. But this wont fix the period between startup and when di kicks in.


As for the vvt if the car wont idle properly after a tune reflash for about a minute with no throttle input then ecu eont eeont enable vvt. At some point car needs to idle with zero throttle before vvt will engage.


Could also be a bunch of other issues


Check your DI compiter is bolted up to engine will all three bolts, if hthat box has no earth weird stuff happens


also check for vaccum leaks especially hoses on underside of manifold , if your boosted did you clamp them as if not they will blow off with boost

Hello all.

Did anyone get to a solution here? we having the same issue.

We have DW 900's as Port injectors and i have sent the Latency/dead time according to 3bar base pressure. I have been hunting around and cannot find a conclusive answer to what the base pressure is, logging the car with ecutek the Fuel pressure - PI (Bar) has zeros throughout the logs....

We having the same issue around nasty start and initial idle and as per Steve99 you can see the PI are at 100% for a period and then it flips over to DI.

at WOT it is fantastic and when you get going it is also good but occasionally idle is iffy at best and cold start is terrible.

i've removed the Close loop fueling Racerom addition to see what affect this will have if any.

[steve99]

Originally Posted by naviuk

Hello all.

Did anyone get to a solution here? we having the same issue.

We have DW 900's as Port injectors and i have sent the Latency/dead time according to 3bar base pressure. I have been hunting around and cannot find a conclusive answer to what the base pressure is, logging the car with ecutek the Fuel pressure - PI (Bar) has zeros throughout the logs....

We having the same issue around nasty start and initial idle and as per Steve99 you can see the PI are at 100% for a period and then it flips over to DI.

at WOT it is fantastic and when you get going it is also good but occasionally idle is iffy at best and cold start is terrible.

i've removed the Close loop fueling Racerom addition to see what affect this will have if any.

Fuel pressure from in tank pump is 60 psi or 4 bar, the low pressure in tank pump is not monitored no sensor only the di high pressure pump is monitored