choke

Phoenix7 · 09-09-2008, 01:20 PM

better coolant/water ratio. Better battery. Better oil (or correct viscosity for your temps). That's all I can think of to help you turn your car on in COLD weather (mind you I don't think I've seen anything lower than 30*).

Jeff4764 · 09-09-2008, 01:29 PM

it starts fine cold, but once it warms up its harder to start and has a problem idoling.

vex · 09-09-2008, 01:36 PM

Quote:

Originally Posted by Jeff4764

it starts fine cold, but once it warms up its harder to start and has a problem idoling.

Check your compression. As well as do a tune up on your car. You may have to adjust the idle, and a few other things here and there. Make sure your TPS is in spec and all the rest. This is a hot start issue, not cold. Also, what's your car? S4 or S5?

vex · 09-09-2008, 01:34 PM

Quote:

Originally Posted by Jeff4764

is there an automatic choke on an 87 rx7. I know its fuel injected and most of them dont have them, but theres gotta be something of the sort
for it to start cold.

Careful with your question there's two different systems that were instituted for the car to start up in cold weather. There's also a third system that I'll describe later to better help you understand.

Quote:

Originally Posted by phoenix7

better coolant/water ratio. Better battery. Better oil (or correct viscosity for your temps). That's all I can think of to help you turn your car on in COLD weather (mind you I don't think I've seen anything lower than 30*).

Yes, having the correct Viscosity and a better battery and at least a 50/50 mix of coolant will help in the cranking during cold weather. Also in aiding a cold start you must have good compression on both rotors. Carbon build up also may interfere with cranking.

The two systems built for the RX7 and specifically for the FC is the accelerated warm up protocol, and the Cold start system. Both these systems are not that good at doing what they should. Accelerated warm up puts un-needed stress on the engine and the Cold Start System flat out fails.

The third system is a standard protocol that all cars have. It's the cranking fuel map. This is based on coolant temperature and will alter the P/w of the injectors for start-up.

Ensuring that you have the correct oil, and the proper systems disabled will help you in starting the car.

09-09-2008, 01:29 PM	#2
Jeff4764 Rotary Fan in Training Join Date: May 2008 Posts: 40 Rep Power: 0	it starts fine cold, but once it warms up its harder to start and has a problem idoling.