Cold as Hell and car Wont Start

[supraguy31]

Ok all, Since this is a MK3 engine I thought that it would be best to ask you all. I have a 84 Supra with a 7MGTE engine installed. Now here is the Problem.

Ive changed the Fuel Filter, Cold Start injector and the cold start injector sensor on the thermostat housing. If its decent weather in the morning, The car will start up just fine, Once the Temperature gets cold at night, I go out to start it up( About 5:00am) and it wont at all. I can sit there for 10 minutes trying to start it and all it will do is turn over.

Here is the strange thing. If I dont touch it again until probably noon time, I sit in it, Turn the Key and it will fire right up and not have anymore Problems throughout the rest of the day. Go back out the next morning when it time to go to work, Turn the key and nothing again.

Can someone please tell me what is going on here. I dont understand what the cold weather has to do with a car not starting up or even firing.

Robert

 

[MDCmotorsports]

Possibly a moisture problem with an electircal plug, but Im guessing its fuel.

A cold engine takes ALOT of fuel to start. I have worked with stand alone maps before and you would be amazed how much fuel it takes to start and engine, and how little it takes to keep one running at idle.

That being said, you need to run the wiring down and verify that the cold start injector and circuit are working propery and that the computer is making it work.

 

[supraguy31]

Any Other Advice unless that works.

Robert

 

[IHI-RHC7]

I'd say give it about 90% throttle when trying to start it. IIRC 100% turns off the injectors altogether when starting, so give it lots of fuel.
What MDC said is true, it takes a ton of fuel to start a cold motor.
What's your fuel pressure?
-Jake

 

[SupraMario]

just wandering but if he is manual would it help for him to try and jump start it. get the pistons moving so that the explosion could be less???
dunno just a guess.

 

[IHI-RHC7]

No, it needs fuel to get the combustion process started.
You might want to try a fresh set of plugs/ wires, as well.

 

[supraguy31]

New MSD wires and NGK Plugs.