One thing I may attempt but I am very weary of doing, is swapping the Evo injector driver transistors out for a set of Non-Turbo 3000GT injector driver transistors and see if that fixes the problem... The non turbo 3000GTs utilize saturated injectors off the get go...

MrFred, is there anyway you can do some digging around in the ECU code and see if you can find a table for current vs ms applied to the injector driver, that way we could increase the duration of the initial current pulse applied to the injector driver/injector. Not to be confused with the Initial cranking pulse as that deals the actual IPW. Basically I need to be able to control the current vs time the ECU is feeding into the Injector driver/Injector...

 

I've tended to avoid the code that directly interacts with the hardware. I don't have the embedded processor background to understand it yet. acamus might be able to help here.

I can say though that there is no current driver or any sort of current control with the Evo injector system. Current is driven purely by battery voltage vs the resistance of the injector (and resistor pack if present).

 

mrfred is correct, you have no control over the current on the injector circuit, it's based entirely on voltage and resistance. This is not a peak and hold type drive circuit.

 

The only problem I have with it being the transistors is the fact that the ecu that didn't work in my car was put in another car (dans) and his car still started perfect - if the problem was within the ecu then the problem should follow the ecu, at least you would think?

I know its in the 30's here and the starting issue for me has not changed the least bit.....i still need to follow up with mrfreds fuel pressure test, I have not had the time.

 

I went from having great starting to absolute **** after changing my injector dead times today. Very similar to the starts I had prior to changing my start up tables.

I'm growning stronger and stronger in the belief this is a tuning issue. But I have zero data at this point and probably won't be able to get much over the next two weeks as I have finals to worry about.

For anybody with these injectors on the stock ECU, check out MrFred's thread on Advanced Fuel Control options in the ECUFlash section.

I halved the initial cranking pulse width vs coolant temp values from 50C and hotter and reduced the Cranking primer initial pulse by about 15%.

In the post start enrichment section, I droped the BFPW Startup Comp vs coolant temp multiplier about 25%.

These changes took the car from not starting without opening the throttle and cranking for 3-5 seconds to starting right up without any throttle at all.

 

some of you on here are getting off the beaten path. if it was a tuning issue than we wouldnt be here by now. having a car that starts well and making changes to make it not start well is not the same thing as having a car that doesnt start well and making changes that dont improve the starting. I think this is the third time this was brought up
The only problem I have with it being the transistors is the fact that the ecu that didn't work in my car was put in another car (dans) and his car still started perfect - if the problem was within the ecu then the problem should follow the ecu, at least you would think?

 

I think monitoring voltage at the ecu and injector during cranking might be the next step.

 

Never mind...

 

03whitegsr,
Mind posting up your maps... I'll give it a shot with before and after datalogs. LMK

eric.urness@paccar.com

 

Well I can definitively say it is a heat issue with the injectors for warm starts... I have been in Indiana for the past week where it has been 30* or colder and the car has been starting up right away here in the cold...

 

installed them today, no problems so far. Car runs fine. Better then ever before. Rocksteady idle no hiccups nothing. Super smooth. Starting was fine too. Will test after a long drive. So far so good.

 

Did you make any changes to the start-up IPW tables? What kind of mods do you have, etc...

Its been in the 20-30's here and my starting has not gotten much better, but does seem to start better sooner (usually after 3 hrs of sitting it still wont start good, right now it does) but it still wont start anywhere between 30min-3hrs without a lot of cranking.

 

I have a autronic sm4, I did not drive today. I will check hot starts this week.

 

oh ok - not on stock ecu.....thanks for posting the info, makes a difference as most of us having problems are all on the stock ecu BUT not everyone - there are a few on the stock ecu with 0 issues.

 

I should just buy some ID2000's...