87 rx7 gxl NON TURBO

Intake, Headers, Magnaflows

When starting cold, runs very rough. Have to hold the revs at 2500 to 3k to keep it goin until it backfires a 5 to 10 times, then it kicks in and runs fine. When re-started hot, lots of blue smoke for a few seconds, then clear. Has new plugs (3 months), Platinum NGK's. Changed wires, tried different set of coil/ignitors from an 88, did the same start cold, and the coils from it worked fine on the 88. Any ideas would be helpful

Thanks - Ron

 

Backfired for about 2 minutes this morning before it smoothed out. This can't be good for anything inside there.

 

Additional information: I am losing coolant, but no drips on the ground. The sensor buzzer goes off regularly, but I can make it stop by revving a few times but to stop it for a few days, I have to fill it up.

 

You should start with a compression test of your motor.

 

Nemisis: I'm trying to figure out where you are heading....Is there a "head gasket" type of water seal between the rotors? could there be a crack that acts differently hot vs cold that could be responsible for all of these symptoms? That's a re-build...right? I've had it suggested (by J-Rat on RX7club.com) that if I fill the water system (cold). And pull your EGI fuses. Leave the water cap off. Crank motor. Geyeser out of the water neck = blown water seal. Same as a bad head gasket.

Whaddyatink?

-Ron

 

There is no head gasket on these cars. I guess the water seals could be considered similar for explaination sake. Have you tried this test? What happened?



I suggested testing your compression on the motor because of yourr starting and idling problems. These could be caused by lowered compression. Possibly not though, you can't tell until you have tested them.



In my estimation, these are the best places to start. Go from there based on your findings.

 

I'll do the compression test, and the Geyeser test.

Thanks a bunch....I'll pick the thread up at that point.

-Ron