When the car is cold in the morning it very hard to start although the engine turns over easy. When it eventually starts it run at 900rpm which it maintains hot or cold. A new start temperature sensor was fitted on instruction from a mechanic, yet no improvement.
I've owned the same car. Check that the fuel relay 'primes' the system before you start the car. When you turn the key to the on position (all you dash lights, ready to start) you should hear the fuel pump run for a second or two. If it doesn't run you can replace the relay for about $30. If the relay is not the problem, it may be a check valve within the fuel line to the engine. This valve keeps fuel from draining back to the tank when the car is sitting. That way, there is fuel close to the motor when it's time to start. The temp senor was not a bad shot, they were thinking it was bad sensor not telling the cold start injector to run. Obviously not the case. However, the injector itself may be faulty in some way. As long as the car always starts, it's one of these problems, assuming the ignition system and engine mechanicals are in running order.
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Probably the o-rings for the injectors are leaking-this will cause fuel under pressure to leak into a static cylinder, when you try to start it the plug is wet with fuel and the car will be difficult to start. They are pretty easy to replace on early 90's Nissans.
Hey Everyone, this is a little tip for your morning start up, Where i live its geting cold and Everyone hates cold starts,
If you turn your key twice, Just before you start, wait for engine light to go on, Wait for it to go off, turn the car off, turn the car back on wait for the engine light again, when it goes off, start your car,
This primes your fuel pumps for a better start especialy if the car has been sitting for a good while
see if your engine has a ECT sensor (temp sensor that delivers information to your ECM) they are installed on the intake side of the cylinder head, it usually has 2 cables, have it checked replace if necesary
try running lighter weight oil in the winter time, if the oil is too cold the starter will have to work extra hard to turn the engine over and sometimes this will cause fuel problems because the injectors are timed with the engine.
The cold start valve is not operating correctly. Either the engine coolant temperature sensor is bad or the cold start valve itself is bad. You can check the engine coolant temperature sensor by going to radio shack or any electronic store and purchase a 15k ohm or higher resistor. Disconnect the engine coolant temperature sensor (ECTS) harness. Bridge the 2 female spade connections in the harness with the resistor. Start the engine. If the engine starts you need to replace the ECTS. If the engine is still hard to start, you need to remove the cold start valve, (wear safety goggles, and whatever you do don't smoke) place the cold start valve in a glass and have someone crank the engine. You should see gas coming out from the cold start valve. If not take a ohm meter and measure the terminal at the cold start valve after disconnecting the wire harness. The meter should read 25 ohms. If it doesn't replace the cold start valve.