So ive got 1/5 time a hard engine start/iddle issue for first 15-20 sec(hot or cold engine)i have to hold the trottle a little and my afr are rich(10.3-10.8)other than this issue when engine is hot idle is fine and afr

Setup is 8000km engine/head rebuilt,brand new oem spark plug,plugs,rotor,cap,waterpump etc and im on a pr4 chipped obd1 ecu street tunned

I dont really know where to look at,my R is in great shape iac is clean ,im on try another ecu/chip

 

when it doesnt do this, what is your resting idle?

Have you messed with the throttle stop screw at all? Or adjusted the throttle cable at all?

 

Iddle is 950 rpm(approx),,trottle cable and stop screw/idle screw are flawless..maybe the trottle position sensor/tune /ecu or chip??

 

will try a p06 and new chip

 

I just tried a p06 chipped and a 3hours (and still in test) of testing and no issue for now! weird situation??!!,, the chip job on the p06 was made by a professionnal vs my pr4 by a newbee,i will post a picture of the pr4 later tonight..we can see the poor job

 

uptdates,,same result with the p06,,,so i changed the coil/ignitor in my dizzy,,now the car start but run ritch at cold start,and when the engine is warm,,i have to give 1/4 of trottle to be able make start the engine,,,i will take a look at the ect sensor and ignition timiing

edit: ive changed the ect and same thing... made a video


Type r idle and rought start :

 

Anyone think that my tunning could be wrong??

 

Is your engine/head OEM rebuild?

What is your fuel pressure set at? Do you have a gauge on it? Check to see if its constant with pressure or fluctuating/losing pressure. Fuel Pump could be slowly showing signs of it being on its way out??

If all of those things are OK or new or checked, if you have another MAP sensor laying around try that. Also reset your ECU when installing the new MAP sensor.

 

Forged internal(wiseco,eagle and arp) head is crower stuffed..ive not looked the fuel pressure..ive read on the web about the symptoms of a bad fuel system and i think this is not my issue i can hear the pump at acc just before starting the engine..my map sensor work a1 but when i unplug it my engine die in less than second..

 

With that much work done it really needs a proper tune. Something just the slightest bit off could be causing a intermittent start issue.

 

And also no c.e.l