ta79pr
Veteran Member
crankshaft positions sensor or camshaft position sensor. it must be crankshaft if it is down by the oil cooler. how does it get its information? optical, magnetic?
I for 1 am very interested in your findings. Let us know if the sensor solves your problem. Then we will have to figure out a way to diagnos whether its a starter or a sensor. There must be a vag-com measureing block for this.........????? Anybody got any ideas??Michael_Akamatsu said:I have purchased a new engine speed/crank angle sensor for my 99.5 Jetta, and will install it this weekend. I have had the hot start problem, and have replaced the battery and the starter, and have checked the injection timing. I will post the result of the R&R once it is done.
I need to draw it out per the original information. I think he used a Normally Closed pushbutton and added the resistor across the two poles, when you pressed the button the switch opened and the resistor was used (to tell the computer, I'm Cold) and the car was started. Since the computer is used to the value of the temperature changing, I don't think it would throw an error code. To re-think the relay. Use a Normally Closed set of contacts, the temperature sensor wires are soldered to the NC contacts and then the resistor is soldered across the same terminals. If it's Cold and the sensor tells the computer to fire the Glow Plugs, you'd wait for the light to Go Off and start the car normally (and the relay) would still tell the computer its Cold. (No problem.) If it's Hot, as soon as you crank the starter the relay (resistor) tells the Computer it's COLD and you crank faster. How 'bout it? Yea or No? I can make a drawing or even wire a relay and try it out.rskovira said:MCathcart, I was looking at the relay hookup a little differently. What does the resistor from the common to NO do? With your hook up the relay is de-energized after releasing the stater solenoid right? Before you hit the starter solenoid do you think the signal from the ETS would have any influence before its interrupted by the relay opening?
Hello Michael,Michael_Akamatsu said:I have purchased a new engine speed/crank angle sensor for my 99.5 Jetta, and will install it this weekend. I have had the hot start problem, and have replaced the battery and the starter, and have checked the injection timing. I will post the result of the R&R once it is done.
I've had an odd thought in the back of my head for a while that perhaps when the engine is turnning over the voltage drops low enough to cause the sensors / ecu problems.sidsnot said:Since then for the past 20,000Km's I have just lived with it trying to think what else it could be. I decided to try somthing out. After the engine was at operating temprature at about 15 K.P.H. I turn the engine off & let it coast for about 5 secound & let the clutch out in 5th this way I knew the engine was turning over slowly. The engine fires right up? this proves the sensors & starter motor are not at fault.
Any suggestion.
With the engine off, 12.75V. With the engine running, 14.1V.ZapBuzz said:i'm curious what voltage others have on their battteries who have a hot starting problem. (running and/or off)