Thread: Wont start/idle

My 200sx wont start/idle right and im wondering, which sensors can cause it to not start?
It is a 95 with the sr20; i've already checked plugs, wires, cap, etc. I tested the distributor and it fires all the injectors like it should. When the key is on the start position it will turn on the pump like it should for about 10 seconds so Im thinking fuel pump should be good but will test with a pressure gauge. The car cranks but wont start or if it starts it wont stay running.
Right now I suspect my coil is going since the spark seems weAk; i've already replaced the maf with a known good unit too.
What else can i look at? Im running out of ideas here

maf, ivac, coolant temp sensor, all grounds.

ivac, coolant temp sensor, all grounds.

does the car start better if it is cold?

It wont start at all or if it does it wont stay running for long.
Grounds are all connected (intake manifold).
Also no CEL codes...

theres alot more grounds then just intake mani. i belive there are 8 needed ground in the engin bay for a sr20. and still check the coolant temp sensor ( its right above the oil filter and is red 2 wire pigtail. next to a single wire black pigtail. and again check the ivac.

He is referring to the engine to body grounds. In my experience when the engine to body grounds are in bad shape the car won't even attempt to turn over. However, it is 30 minutes worth of work and free, so it should be towards the top of your list of things to try.

the first post shows grounding locations
http://www.sr20-forum.com/general-sr20/38900-how-do-i-prevent-corrosion-new-grounds.html

also you should have atleast 1 ground from your transimssion to body

I know all those are connected except for maybe #5 and #7. Trans to body is connected as well.
Motor does turn over BTW, starter engages and everything.

Checked all grounds and they are all there no corrosion.
Im thinking the ECU might have gone bad, what are usual symptoms of a bad one? Also which year G20 ECU can i get to replace mine? 200sx are scarce in my area.

O2 sensor maybe... Did you pull the plugs and look at them? Are they rich (wet)?

Did you do anything different to the car (add parts etc.) or was it fine one day and then not starting the next morning?