Interesting 3FE Problem

[lagwagon]

A little history: '91 FJ80 w/262,000 miles. The motor was replaced by a 125k motor by some friends. Shortly after passing smog it began to have hard hot restarts. It would crank over several times, then backfire and start. While checking the ignition system we found the distributor cap broken, and I mean a big window in the side. We replaced that but it didn't help the hard restarts. Eventually we had RC Engineering clean and balance the injectors as I found that two of them were flooding cyls after shutdown. HUGE improvement. Starts every time nicely, until today. Cranked it over after already driving it and it backfired, blowing the distibutor cap in half. I am going to storage to look at the hose routing on my other '91 but has anyone seen this before?
Thanks

 

[RavenTai]

WAG: could be fuel vapors are getting into the vacume system somehow and into the distribotor cap

 

[motorsargeT]

WAG: could be fuel vapors are getting into the vacume system somehow and into the distribotor cap

I agree. look at the 2 vent hoses coming off of the distributor cap. if one is connected to a small solenoid right in front of the charcoal canister it is wrong. the hose coming off of the solenoid(canister purge solenoid?) should head up towards your intake. if it's going to your cap thats a direct line for fuel vapors to get in the cap, especially if that solenoid valve has recently gone bad.