So i just did an engine swap on my navigator,try to start at first time it cranks and the motor runs,but i notice this wining noise so while im trying to figured out whats the noise was, suddenly a loud snap happened i hsut off the car immediately go under the car and check the starter, i touchted it and it was very hot, so isaid fine get a new one a rebuilt one, bench test it seems ok, installed and there it was again damn.Now im a bit slow on electrical side, i need help on two solve this issue. thanks in advance jack
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Re: starter motor always turning
The starter is not disengaging back. When you start the car the end of the starter pushes out, then retracts again. find out why it is doing that. This could be a mechanical problem. I dont think it is electrical at all.
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Are you saying the starter motor won't crank the engine? At the starter motor, two voltage circuits, one comes from the battery, hot all the time. The other circuit goes hot with key in the crank position and is wired through the neutral or clutch switch. The starter motor grounds through engine block. You have all grounds hooked up, correct?
Now, if your saying it cranks good but won't start, have to check spark, proper fuel pressure and all that good stuff. Go from there.
I want to see if i catch your drift ! When you turn the key in the ignition switch to start , nothing happens ? Have you tried moving the gear slector to the neutral position to see if it starts then ? Park neutral safety switch problem , maybe .
Here is a description of how it works or how it's suppose to work .
Circuit Description (ECM/PCM Controlled)
Moving the ignition switch to the START position sends a 12-volt signal to the engine control module (ECM)/powertrain control module (PCM) Crank Request circuit. The ECM/PCM verifies that the transmission is in the PARK or NEUTRAL position. With the transmission in Park, voltage flows through the Park/Neutral position switch and feeds the starter relay coil. The PCM then grounds the control circuit of the starter relay. When the starter relay is energized it allows battery positive voltage to the starter solenoid S terminal. On some vehicles the starter will continue to crank the engine with the key released until it starts or the crank command has timed out to prevent excessive heat build up in the starter circuitry or the ECM/PCM receives an engine run flag.
Circuit Description (BCM Controlled)
Moving the ignition to the START position signals the body control module (BCM) that engine crank has been requested. The BCM verifies that theft is not active and sends a serial data message to the powertrain control module (PCM) requesting engine start. The BCM also energizes the RUN/CRANK RELAY. When the RUN/CRANK RELAY switch side closes, and the vehicle is in Park or Neutral or with the clutch is fully depressed, if equipped, supplies voltage to the starter relay coil. The PCM verifies the transmission is in Park or Neutral and the clutch is fully depressed, if equipped. The PCM will then ground the control circuit of the starter relay, closing the switch supplying voltage to the starter solenoid. On some vehicles the starter will continue to crank the engine with the key released until it starts of the crank command has timed out to prevent excessive heat build up in the starter circuitry or the PCM receives an engine run flag.
Do you mean the starter motor runs but the engine will not crank? If so the problem is at you starter there is a small gear that makes the conection between the starter motor and the engine. Some times you can tap the starter with a hammer while someone try's to start it and it will loosen the gear and start. if this works change the starter.
The RX8 has always been a bit problematic at starting, at least until Mazda started fitted uprated starters (~2006). The standard, weak starter motor spins the engine quite slowly, causing problems getting compression to start the engine.
There's various things to try...
DON'T pump the gas whilst starting - foot OFF the accelarator (might be beneficial to depress the clutch just to reduce the loading on the starter motor). Check all the RX8 owners' forums - standard advice.
DO use a confident turn of the key - keep cranking until it catches (but not for more than 10 seconds - in which case leave for 10 seconds before trying again) - don't just crank for a second or two, then retry. That's as per owner's manual.
DO ensure that you leave the engine to warm up ALWAYS before shutting off - to avoid fuel being left in the rotor - that affects compression badly if left any period of time, resulting in very poor starting (risk of flooding).
If non of the above helps, get a hot-engine compression check to ensure that the engine isn't shot. If the engine is okay, then consider getting an uprated starter motor, or 3rd-party replacement. Many 2004/2005s have had their starters replaced (I considered mine, although I've had no problem over winter :)