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I have a 1984 mazda 626 automatic. I have changed the neutral safety switch and vacuum diagphram. The motor turns slowly and doesn't start. Will the filter be the cause of the problem?
1984 Mazda 626 Automatic Transmission.
Standing for about a year.
Started and idled for about 30 minutes. Was fine.
Had to move between P, N, R, 1, 2 to get it started before replacing Neutral safety and vacuum diagphram.
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IF it is an automatic it is the ignition isolator switch that only works in park or neutral. If it is a manual it may be the clutch isolation switch or the neutral switch in the box. As it is a required safety device in the car It will be easier to replace the faulty switch
The circuit on newer cars with automatic transmissions has a neutral safety, or neutral start switch installed between the ignition switch and the starter. The ignition switch cannot operate the starter motor unless the transmission is in park or neutral.
Late model vehicles with manual transmissions have a starter/clutch interlock switch that requires the clutch to be depressed to the floor. Neutral Safety Switch
Normal operations of a neutral safety switch provides a quick check for the adjustment of the gear selector linkage.
To do this, move the selector slowly until it clicks into the PARK position.
Turn the ignition key to the START position.
If the starter operates, the PARK position is correct.
After checking the PARK position, move the lever slowly toward the NEUTRAL position until the lever drops at the end of the NEUTRAL stop in the selector gate.
If the starter also operates at this point, the gearshift linkage is properly adjusted.
This quick test also tests the adjustment of the neutral safety switch.
If the engine does not start in either or both of these positions, the neutral safety switch or the gear selector linkage needs adjustment or repair.
CAUTION Since you must work under the vehicle to adjust most shift linkages make sure you properly raise and support the vehicle before working under it. Also, wear safety glasses or goggles while working under the vehicle.
A voltmeter can be used to check the switch for voltage when the ignition key is turned to the START position with the shift lever in PARK or NEUTRAL. If there is no voltage, the switch should be adjusted or replaced.
If you swapped out the auto for a manual trans the car might have a neutral start safety switch preventing the starter from engaging. This would not be something you would have on a manual transmission. Instead the manual would have the Clutch Safety switch which will only allow the starter to engage if the clutch is pressed in. On an automatic it won't allow the engine to turn over unless it's in Park or Neutral. I would locate the plug for the neutral start safety switch for the old automatic transmission and bypass it.
You need to replace and adjust your transmission range sensor switch. (also known as neutral safety switch) It is located under the air cleaner ducting on the top of the transmission under the lever where the shifter cable attaches.
The park/neutral safety switch has two purposes,
1 not to let the engine start unless it is in park or neutral settings.
2 is when you manually switch gears, it tells the computer and the computer keeps the engine in check until you shift, then the computer compensates for that gear and so on.
I would check motor/ transmission mounts, drive shafts, Suspension bushings,struts, or steering linkage first.
There is a Neutral Safety Switch at the gear shifter. If this switch is broken, it will cause a open loop to check it it is in PARK position so no current can go to the starter, therefore it does nothing when it is turned on.
Sounds like the neutral safety switch is faulty. The engine should not start with the trans. in gear. It seems as though the neutral switch is not disengaging when the engine is running and then put in gear.
In addition, this could be a module fault. I would disconnect the battery for a few hours to reset the module memories. Reconnect and start the car and see if it still occurs. If so, you need to see if you can bypass the neutral switch temporarily and see if it allows you to go into gear. Otherwise, you need to plug in a diagnostic tool and see what error codes, if any, are being displayed. It doesn't sound like a shift solenoid issue, it sounds as though the neutral switch is faulty.
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