WHAT ARE THE KNOCK SENSOR AND THE SPEED SENSOR. I HAVE A RENAULT ESPACE WHICH I AM CURRENTLY HAVING PROBLEMS WITH, IT WON'T START WHEN ENGINE IS WARM.
2007-09-30 06:11:42 · 4 answers · asked by CLAIRE K 1 in Cars & Transportation ➔ Car Makes ➔ Renault
The spark is generated at the coil. To get to the plug it travels through spark plug wires and the spark plug itself. The wires and the spark plugs have a high internal resistance which reduces the spark intensity.
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2007-09-30 06:24:11 · answer #1 · answered by R1volta 6 · 0⤊ 0⤋
Its the same spark but your plug leads may be resistive.
The knock sensor is a device bolted usually to the cylinder block that is used to detect when there is detonation going on in the engine cylinders. Detonation (put simply) is when parts of the fuel / air mix combust prematurely in the cylinder for various reasons you don't need to know. Its bad because it can blow holes in your pistons.
One way of reducing detonation is to use a signal from a knock sensor to retard the ignition timing (done via the engine ECU). It allows the ignition timing to be as advanced as is safe or indeed mapped to be. If the knock sensor fails, it is likely that your engine ECU will default to a safe ignition map to get you home.
A speed sensor - It may refer to an engine speed sensor- usually a hall effect (magnetic) pick up on the engine flywheel that feeds engine speed and and timing signals to the engine ECU.
You can live without a knock sensor but can be stuffed without a speed sensor.
In any event be assured that your car is probably much more unreliable than most given its make. Best buy a Honda or Toyota, some of which are made in the UK.
In my experience its hard to find anyone in the garage trade who really knows about engine management systems let alone afford the stupid prices for diagnostic equipment. If you find one, don't let them go.
And finally (sorry for rambling - its me age) there could be many reasons for your hot starting problems - try renault forums, there may be a well known ongoing issue that causes it.
2007-09-30 07:24:52 · answer #2 · answered by I loathe YH answers 3 · 0⤊ 0⤋
There isnt much difference in the spark except for the resistance of the H T leads. Your problem is likely that the mixture is over rich when starting from cold as the result of a sensor problem
2007-09-30 06:22:36 · answer #3 · answered by Anonymous · 0⤊ 0⤋
If it won't start when the engines warm it could be the cold air sensor wherever that may be on that car. It's telling the brain that the car is cold even when it's warm and therefore the mixture is wrong and makes it a pig to start
2007-09-30 06:14:47 · answer #4 · answered by Anonymous · 0⤊ 0⤋