Mechanics

MAZDA RX7 DISTRIBUTOR PROBLEM

1982 Mazda RX7 • 75,000 miles

It starts and runs for three minutes and then quits starts right back up again and runs for another three minutes and then quits again new fuel pump filter plugs. We have three of these cars but only having problem with this rotary automatic one
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Chrisrobson1
November 26, 2012.




What is the idling speed before it stalled?
Does feathering the throttle prevent it from stalling?


KHLow2008
Nov 27, 2012.
Thank you for the response. The idle speed is around 700. Neither feathering the throttle or pulling the choke prevents stalling.


Tiny
Chrisrobson1
Nov 27, 2012.
This indicates it is not a fuel metering or idling problem and could be an electrical problem. Check the ignition coil and distributor.


KHLow2008
Nov 28, 2012.
Thank you for your response. Short of changing the distributor do you know what the measurements are at the pins. Also do you know what the readings would be at the coil

thanking you in advance

Sheldon


Tiny
Chrisrobson1
Nov 28, 2012.
IGNITION COIL RESISTANCE CHECK

Set an ohmmeter in the low scale. With ignition switch turned "OFF", and coil wires disconnected, attach ohmmeter leads to primary terminals of leading coil and then trailing coil. Primary resistance should be 1.22-1.48 ohms for each ignition coil.

PICK-UP COIL RESISTANCE CHECK

1. Set an ohmmeter in the x100 scale. Turn ignition switch OFF". Disconnect connector between ignitor and distributor. See Fig. 4.

2. Connect ohmmeter leads to leading terminals and then to trailing terminals. Resistance should be 600-700 ohms at 68° F 20° C) for each set of pick-up coils.
If not, replace pick-up coil and bearing assembly.


KHLow2008
Nov 29, 2012.
Thank you again for the response

We got the car running, it was the distributor
Now it seems to be idling at 1300, with the old distributor it idled at 750. And thoughts on why it would be idling so high. How do you set leading and trailing timing

Look forward to your answer to the above questions

Sheldon
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Tiny
Chrisrobson1
Nov 29, 2012.
IGNITION TIMING

NOTE: On vehicles equipped with automatic transmission, block the wheels and place selector lever in "D" position.

1. Warm engine to normal operating temperature. Connect a tachometer, then connect timing light to leading (lower) spark plug of front rotor. Start engine and run at idle speed.

2. Aim timing light at timing indicator pin on front cover and check ignition timing. Rotate distributor to correct timing, if necessary. Tighten distributor lock nut and recheck timing.

3. Connect timing light to trailing (upper) plug of front rotor. Start engine and check timing. If not correct, loosen vacuum unit attaching screws. Move vacuum unit in or out to adjust trailing timing. Remove test equipment.

IDLING SPEED

1. Switch off all accessories. Remove fuel filler cap. Disconnect and plug idle compensator tube at air cleaner. Connect tachometer to engine. Ensure parking brake is engaged and wheels are blocked.

2. On air conditioned models, make sure throttle opener does not keep throttle lever from returning to stop.

3. Warm engine to normal operating temperature. Place automatic transmission in "D". Check idle speed. Adjust curb idle speed to specification by turning throttle adjusting screw.


KHLow2008
Nov 30, 2012.

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