Cold Startup issue

civic4g · Post by **civic4g** » Wed Dec 03, 2008 3:52 pm

Unpluged the iacv and no drop in the rpm was seen. Closed idle screw until +/-500rpm as Gaskleppie recommended, now just need engine to be cold again and test. I've a felling that will have a good surprise because IACV DC correction is way different than it was. It was @ -68% and now it's very close to NO correction at all. Let's see how it behaves.

civic4g · Post by **civic4g** » Thu Dec 04, 2008 7:14 am

Test done. It's better but not perfect, rpm still drops a couple times but far from stalling the engine. The AC trick will help until Calvin can code something (i hope he will), the idea is to get the IACV more/fully opened when ect is below certain temperature.

Post by **Gaskleppie** » Thu Dec 04, 2008 1:20 pm

I have a lot of obd2 cars running and none of them needed a lot of extra tuning. I always set the idle part of the maps a bit on the rich side (13:1) and when I finish the tune and set closed loop on it runs nice without falling deep into the revs. I dont see the point of changing the software. Just tune the hardware right and the software will do the rest. Some extreme cam engines need extra care but I always got them right.

Bindegal · Post by **Bindegal** » Sun Dec 07, 2008 4:06 am

As for tbÂ´s with no FITV and OBD1 eacvs: I have contemplated setting up a solenoid using a general purpose output to draw in extra air @ coolant below 50c or something. I spent some time fighting against an annoying euro accord type R. Which has a 3-wire eacv, so I had to hook up an OBD1 one externally. ItÂ´s a pain

/Allan

xenocron · Post by **xenocron** » Mon Dec 08, 2008 1:55 pm

Been having this issue now too... Car starts and idles perfectly cold...soon as I press in the throttle a little, rev drop and car stalls or almost stalls (depends on how cold it is outside). if I let the car warm up for a little, no issue once the car is a little warmer. I have a couple of ideas, but havent had a chance to play (just moving the car inside to outside and vice versa), but weird that it seems temp related to me.

hondagourou · Post by **hondagourou** » Wed Dec 10, 2008 9:45 pm

xenocron wrote:Been having this issue now too... Car starts and idles perfectly cold...soon as I press in the throttle a little, rev drop and car stalls or almost stalls (depends on how cold it is outside). if I let the car warm up for a little, no issue once the car is a little warmer. I have a couple of ideas, but havent had a chance to play (just moving the car inside to outside and vice versa), but weird that it seems temp related to me.

Exactly the same issue here (-5Â°C and colder). With an obd2 ecu, everiting perfect. Someting in the OBD2 code correct this situation. My idle is 500rpm iacv disconnect.

civic4g · Post by **civic4g** » Sun Dec 28, 2008 9:48 pm

It's getting worse. Help please.

Post by **Gaskleppie** » Tue Dec 30, 2008 6:11 am

You have to make cold start datalogs. Calvin is in Suriname and does not have these kind of cold temperatures. Make sure your wideband is working at cold start!

Bindegal · Post by **Bindegal** » Tue Dec 30, 2008 7:05 am

Maybe even power wideband from a seperate power source so accurate data is available right from the start (literally!)

/Allan

Wazzzup · Post by **Wazzzup** » Tue Dec 30, 2008 7:27 am

I wanted to make a coldstart log but eCtune is locked up. Temp is -7 celcius.

RoadXY · Post by **RoadXY** » Tue Dec 30, 2008 4:03 pm

run force update. It (now) update's to .6