Jump to content
SAU Community

Cold Start

08r3308

By 08r3308,
in General Maintenance

 Share

Recommended Posts

central coast person Proficient

central coast person

Posted
Posted

Cleaning the cold start regulator will do nothing as it is only a valve that opens and shuts. The disc is half open at 20 degrees celsius making the idle about 1400RPM, so when you start your car and its starts that second time if it idles high when cold and low when hot then the regulator is operating fine.

As for power FC, it could be running a tune that is able to handle a rich cold start and yes you cold have had a faulty ECU but i don't know why or how the ECU would be fine the 2nd start and reset hours after only when its cold. Then in summer this problem does not occur (well for me), that's how i figured out it was a leaky injector then i pulled the rail out and primed the pump and saw it drip. 08r3308 you should do this because your going to have to eliminate possibilities with so may different opinions.

SargeRX8 Grand Master

SargeRX8

Posted
Posted

I'm starting to get a VERY rich fuel smell which happens only for about 2 seconds when I start the car. Not when I prime, only start. Ive got brand new injectors seated in a fuel rail with all brand new seals and rings. There is no smell of fuel in the engine bay at all. I can smell it in the cabin for a couple of seconds. Fuel hoses are all tight and secure. I think I'm just running way too rich and some raw, unburnt fuel is making its way into the exhaust before being burnt. The power FC isn't giving me any starting issues.

I too can now suggest you check your injectors. Its not hard to do. Have someone keep priming your fuel pump and just have a smell around the engine pay. Its a PITA to yank out the fuel rail, and the smell of fuel is really strong so if it is leaky I'm sure you will smell it.

Your engine bay should NOT smell like fuel.

central coast person Proficient

central coast person

Posted
Posted

I'm starting to get a VERY rich fuel smell which happens only for about 2 seconds when I start the car. Not when I prime, only start. Ive got brand new injectors seated in a fuel rail with all brand new seals and rings. There is no smell of fuel in the engine bay at all. I can smell it in the cabin for a couple of seconds. Fuel hoses are all tight and secure. I think I'm just running way too rich and some raw, unburnt fuel is making its way into the exhaust before being burnt. The power FC isn't giving me any starting issues.

I too can now suggest you check your injectors. Its not hard to do. Have someone keep priming your fuel pump and just have a smell around the engine pay. Its a PITA to yank out the fuel rail, and the smell of fuel is really strong so if it is leaky I'm sure you will smell it.

Your engine bay should NOT smell like fuel.

When you go to fill up with petrol do you get that "PSSHH" sound when taking the cap off, also on hard right turns you will get a stronger than usual fuel smell ....... if so then its the fuel filler cap. Other than that there is a million and one things to try.

SargeRX8 Grand Master

SargeRX8

Posted
Posted

Do you really think if there was a leak that you won't be able to smell it? Fuel has one of the strongest smells and even a drop in your engine bay will be very distinct. Ive got my old fuel rail here which was pulled out of the car to fit in the new rail. Ive pulled out all the injectors and the rubber is still nice and supple and there are no cracks or tears.

I just think that if there was leaky fuel, you would smell it. Just loosen the rail where it sits, lift it up and them keep priming your fuel pump over and over and watch for leaks.

SargeRX8 Grand Master

SargeRX8

Posted
Posted (edited)

Yeah I was thinking about that... if its leaking it will be leaking into the piston causing the cylinder to flood and bog down. Why not let it die down as it does then rip out the spark plugs and look for wetness. Its MUCH easier to pull spark plugs than it is to pull the rail.

When you go to fill up with petrol do you get that "PSSHH" sound when taking the cap off, also on hard right turns you will get a stronger than usual fuel smell ....... if so then its the fuel filler cap. Other than that there is a million and one things to try.

My old car did and that. I just tried it out on this car(and I recall when I used to go fill up) it does not do the psssh sound. I don't think it ever has... I took the cap off my other skyline and chucked it onto this one. The car is warm so I'm gonna let it pressurize then remove it see if it makes a difference. Is the filler cap not going pssh a problem WITH the filler cap?

Edited by SargeRX8

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • iain_ST44GA
      M35 VQ25DET starter motor

      By iain_ST44GA · Posted

      Hi Guys, Does anyone know any aftermarket part numbers for a starter motor to suit the VQ25DET? I can find lots of alternative part number for the VQ35DE, which I assume would fit, but there is a lot of conflicting information out there. Thanks..
    • Murray_Calavera
      R33 GTR running -9 with no tune

      By Murray_Calavera · Posted

      I don't understand how this hasn't boiled down to - Upgrade the turbo when you have everything required. ECU, injectors, fuel pump, turbo, etc. Do it all at once.  If you don't have everything required, just enjoy the car as it is and keep saving up your pennies. 
    • Duncan
      R33 GTR running -9 with no tune

      By Duncan · Posted

      Sounds like you've got an interesting adventure ahead here with local support if you have trouble! My guess is that, unboosted, you will be OK with a small upgrade like -9. What will happen is that once the stock ECU sees more airflow than it expects it will add a heap of fuel and pull a heap of timing to be safe because it can't understand how it could get that much air without there being an issue. You will see clouds of black smoke and it won't pull hard through the midrange and top end. So, overall it will be a bit frustrating but should be OK. If you are still nervous set the base timing back 2o through the CAS, but it will be even more sluggish everywhere. As said above through...this is not my guarantee your engine won't be blown into a million pieces, leaving you looking for very hard to find parts A better idea is get a computer with logging ASAP, wire in a wide band O2 sensor and a use remote tuner. I've done multiple cars this way and while it is not as good as a specific tune on a dyno they can get it 90% right. I'd suggest if you can afford an R33 GTR these days you can afford an ECU and tune. And if you can't afford that you sure won't be able to afford the rebuild if it goes bad in the meantime,.  
    • Duncan
      New kid on the block

      By Duncan · Posted

      Yeah it would be nice if someone took the time to put that sort of information together, but there are a lot of variations in looms. I think you are making this way hard for yourself if you just want to get it running....sourcing an SR20 with the right wiring will be a billion times easier than matching the RB loom to an S15 chassis. If you do end up going this way, you just need to trace every wire in the loom with a multimeter, 95% of them will go to a location you can confirm at the ECU.....and then post it up for the next person who needs it  
    • Duncan
      Coolant leak?

      By Duncan · Posted

      Just top it up with water, and keep a general idea of how much you added. It is normal for water to be pushed into and pulled out of the reservoir through the cap, and it should not be more than half full or it will be likely to overflow when hot. Any decent mechanic can do a pressure test of the cooling system to confirm if you have a leak. Keep in mind if it is only leaking a little and when hot it may well evaporate before you see it hit the ground
×
×
  • Create New...