So I got a 94 civic sedan for free with a blown up motor. I got a used motor on craigslist and swap it......

So the car drove fine for four months now it drives only for about 20 minutes and then back fires and loses power and dies out completely and won't star at all I do smell fuel fuses..... I change the fuel relay and same problem happens...... if I wait three hours the car will star and it runs fine till it warms up in 20 or 15 minutes and does it again, it stalls, back fires, and dies out completely....... is there a sensor that can cause this problem?

Any help will be appreciated......

 

The timing belt is good....... I took another IAC valve from the junk yard and swap it and it's does the same problem. I check all the wires and everything is like its suppose to be. Is weird that is run but when it get's warm it stall and the engine dies out, any help will be appreciated.

 

Check coil and ICM and connections to them.
Sounds like it is an ign. problem, [no spark] check for spark next time it will not run. 94

 

Could it be that the ignition timing is advanced too much? At higher RPMs while the car is cold, everything is good but once it warms up the RPMs drop and the engine backfires and dies.

 

fcm^

 

check your map sensor

 

Replace the dizzy, your Ignitor is going bad, if you haven't figured it out by now.

Buy a rebuilt dizzy for about $160.00 it will be cheaper in the long run, trust me.