starting issues

[Gianni]

Take fuel rail out with injectors. See which injectors are firing and which aren't. It would be good to see what kinda pressure the fuel rail is holding. I also have a spare fuel rail and regulator kicking around if rail turns out being te problem

 

[PREDATORVR4]

Yeh im going to get a new reg since i only have the stock reg on atm im hoping that might help.

 

[Gianni]

Big fuel of testing. Always replace with stock parts to find problems. Upgrading whilst having problems can cause more problems and make it harder to find. Had a mate instal cams and car wouldn't start. So he went ahead and did injectors and turbo and regulator and manifolds ect before fixing the other issue. Ended up timing being an issue. Then fuel aswell. The way we figured it out in the End was take off all the mods he had done since the issue

 

[PREDATORVR4]

Yeh well ive tried that way and didnt change anything lol everything to do with spark or fuel ive swapped with matching stock parts and hasnt made a difference, Im just not getting fuel in the cylinders

 

[Gianni]

Can u see fuel coming out of each injector?
Have you done a compression test? If fuel is coming out of all injectors. Then maybe a compression issue is making no power from 3 cylinders.

 

[PREDATORVR4]

Ok i got a test light and found all 4 injectors have power but no pulse.

 

[PREDATORVR4]

Could it be my CAS?

 

[Gianni]

It could very likely be the Cas. I have a spare if you wanna test with a new one. Otherwise could be something ecu related too

 

[PREDATORVR4]

Well the only thing is the motor was from my old vr4 which had a mircotech and was tuned. But now ive removed the microtech and installed the stock ecu and standard loom since i had the same issue when i put that motor in this car, so basically i have left the CAS as it was when it was tuned and had the microtech.

Would adjusting it back to stock help before i replace it?

 

[Gianni]

Yeah try the Cas in different positions.see what u get honestly don't know how to test if a Cas isn't working though

 

[PREDATORVR4]

So adjusting it wont do any harm?

 

[Gianni]

Nope. Just messes with when your spark plugs injectors ect squirt and fire ect.

 

[PREDATORVR4]

Ok thanks ill give it a go

 

[PREDATORVR4]

Well i spent ages adjusting the cas sensor but nothing changed sigh

 

[4piknup]

Stop buying bits for it, and get a compression tester.
Test it wet and dry and give the results.
What cylinder is it running on? Remove plug leads til it makes it run worse?

A test light has no way of testing pulse. You really need a duty cycle tester on a multi meter. But if the light is illuminated when you crank engine I would suggest you have a pulse.
With a multimeter, you will get 5v at 100% duty, 2.5v at 50% duty. Etc.

 

[JayRome]

Stop buying bits for it, and get a compression tester.
Test it wet and dry and give the results.
What cylinder is it running on? Remove plug leads til it makes it run worse?

A test light has no way of testing pulse. You really need a duty cycle tester on a multi meter. But if the light is illuminated when you crank engine I would suggest you have a pulse.
With a multimeter, you will get 5v at 100% duty, 2.5v at 50% duty. Etc.

as above...

 

[razza]

Something else to consider is the water temp sensor. If your ECU isnt getting a reading for that the car wont start. I would get a datalogger onto your car to you can check the outputs of all the sensors. Then you can eliminate a few things.

 

[4piknup]

It's starting, but not running on all cylinders

 

[PREDATORVR4]

Hmm well i tested compression sometime ago it was fine.

It wont start at all at the moment the pots are dry