1987 engine not starting after shutoff
10-03-21, 10:15 AM
#1
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1987 engine not starting after shutoff
I am new to RX7club. I have owned this car for 2.5 years using it as a daily commuter. the car runs fine but it does not want to start after driving/shut off. it needs time to cool off, then everything is fine. does anyone know why this happens and/or what the fix is? Thanks. 10/3/21
10-03-21, 01:19 PM
#2
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Welcome to the forum 
Usually this is caused by leaky fuel injectors or low compression.
Leaky fuel injectors is the most common. The car shuts off, fuel slowly seeps into the intake from the injectors leaking. Then when you try to start the car is flooded. When the car cools back down the higher cold compression helps it overcome the flood and start back up.
The quick and dirty way to test this is to drive the car until it's hot and then instead of using the key to shut the car off, disconnect the fuel pump using the 4 pin connector under the drivers side shock tower carpet (rear side). You'll hear the car sputter and die as the fuel in the rails loses pressure. Then reconnect it and try to start. If it works, it was probably injectors. They can be cleaned and rebuilt cheaply, but you need to take the intake apart to get to them.
Compression is the next likely cause, but don't worry about that until you've tested the injectors.
Usually this is caused by leaky fuel injectors or low compression.
Leaky fuel injectors is the most common. The car shuts off, fuel slowly seeps into the intake from the injectors leaking. Then when you try to start the car is flooded. When the car cools back down the higher cold compression helps it overcome the flood and start back up.
The quick and dirty way to test this is to drive the car until it's hot and then instead of using the key to shut the car off, disconnect the fuel pump using the 4 pin connector under the drivers side shock tower carpet (rear side). You'll hear the car sputter and die as the fuel in the rails loses pressure. Then reconnect it and try to start. If it works, it was probably injectors. They can be cleaned and rebuilt cheaply, but you need to take the intake apart to get to them.
Compression is the next likely cause, but don't worry about that until you've tested the injectors.
10-04-21, 03:05 PM
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I tried to respond to you but i got an email that it did not go thru.
i drove it for about 30 miles and then disconnected the fuel pump connector, then re-connect and it started back up.
the car would not start after sitting about 15/20 minutes of the injector leaking into the manifold(?)
edit:
i think there was an error to my method of logic here.
i think i should have pulled the fuel pump connector to stop the engine, then wait 20 minutes to re-connect before trying to re-start the engine.
with the fuel pump stopped there should not have been any leaking fuel thru the injectors.
i will drive the car again in the morning and try this out.
thanks for your help.
thanks!
i drove it for about 30 miles and then disconnected the fuel pump connector, then re-connect and it started back up.
the car would not start after sitting about 15/20 minutes of the injector leaking into the manifold(?)
edit:
i think there was an error to my method of logic here.
i think i should have pulled the fuel pump connector to stop the engine, then wait 20 minutes to re-connect before trying to re-start the engine.
with the fuel pump stopped there should not have been any leaking fuel thru the injectors.
i will drive the car again in the morning and try this out.
thanks for your help.
thanks!
Last edited by mikebolin; 10-04-21 at 09:22 PM. Reason: i think i missed something.
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