SR20DE Cold Start Problem

GTiR 14 · Postby **GTiR 14** » October 12th, 2009, 9:30 am

SR20 guys, I need your help with this one.
Engine is in a SSS Bluebird. In the morning it tumbles almost starting but keeps cutting off. I'll continue this process over and over until it starts. After it starts it runs fine and would start perfectly for the rest of the day. The next morning, it's the same thing again.
I initially thought it was the coolant temperature sensor, that was changed but same problem.
What could be causing this problem?

praise · Postby **praise** » October 12th, 2009, 10:01 pm

Firstly, did you use an original sensor? These sensors are colour coded as well. Make sure you use the same colour and original sensor only. Try another sensor, sometimes the new one can be faulty. Secondly check your plug wires and finally use electrical grade contact cleaner on all electrical connections. Also check your fuel pressure before starting in the morning. Sometime the fuel pressure is under the required amount of PSI, this could also be the result of a defective gas tank cover. After a run, open the gas tank cover and listen for a rush of air, breaking the vacuum. If you do not hear this, your cover is defective.

THE SYNDICATE · Postby **THE SYNDICATE** » October 13th, 2009, 4:17 pm

Also check your fuel pressure before starting in the morning. Sometime the fuel pressure is under the required amount of PSI

was thinking this but i doubt it.

GTiR 14,Does the car 'stutter' when u rev it out?

GTiR 14 · Postby **GTiR 14** » October 14th, 2009, 6:40 am

^^^No stuttering or anything, once the car is started it works fine.

praise, the sensor used was the same color as the one that came out. I'll try your other suggestions and see if that helps.

NiSmO-R · Postby **NiSmO-R** » October 14th, 2009, 8:53 am

What kind of oil do you use?

praise · Postby **praise** » October 14th, 2009, 8:58 am

Are you using the correct heat range spark plugs?

GTiR 14 · Postby **GTiR 14** » October 14th, 2009, 10:00 am

What kind of oil do you use?

Currently using Castrol 20-50W but I'm considering switching to NP Ultra.

Are you using the correct heat range spark plugs?

I use NGK V Power, I need to check the heat range on that.

TriniGT · Postby **TriniGT** » October 14th, 2009, 12:57 pm

Sounds like a clogged Cold start unit/ IACC Valve. On the intake manifold there is a unit that is held with four bolts that too has the idle screw. I would remove it and get some bars or carb cleaner and give it a thorough cleaning and replace and see if that helps. You may then need to sequence the TPS and idle to have it running at a proper idle RPM. Looks like after tumbling the engine gets just warm enough to start but initially when cold it won't budge.