curtis73
Member
- Joined
- Sep 1, 2018
- Messages
- 121
- Reaction score
- 6
- Points
- 18
- Location
- Harrisburg, PA
- Vehicle Year
- 1994
- Make / Model
- Mazda
- Engine Size
- 4.0
- Transmission
- Manual
About three times in the last year, my 94 B4000 has a hiccup. It cranks and starts and runs rough and barely idles at about 500 rpm. I can usually get through it with modest throttle or just waiting a bit. It will run rough for 30 seconds or so, then kicks in with a misfire on one cylinder for a few seconds, then runs great. Fuel pressure tests great, right in the middle of the spec.
The other day I pulled into a restaurant for dinner. Came out, started, sputtered, died. Crank but no run. Occasional fire on a couple cylinders but not enough to keep it running. I started poking around under the hood. Pulled a plug wire and got good spark, but when I pushed the schraeder valve on the fuel rail I got vapor/air for the first couple seconds. I cycled the key a few times, got more vapor/fuel. Once I got mostly fuel, I tried to start it but still no-go. Had it towed to my buddy's shop. Three days and she couldn't duplicate the problem. She used it for parts runs to get it up to temp, tried it cold, tested pressure. No issues.
I took it back and used it yesterday and it acted up one more time (sputtering idle for a bit) OBD1, so no CEL.
Ideas?
The other day I pulled into a restaurant for dinner. Came out, started, sputtered, died. Crank but no run. Occasional fire on a couple cylinders but not enough to keep it running. I started poking around under the hood. Pulled a plug wire and got good spark, but when I pushed the schraeder valve on the fuel rail I got vapor/air for the first couple seconds. I cycled the key a few times, got more vapor/fuel. Once I got mostly fuel, I tried to start it but still no-go. Had it towed to my buddy's shop. Three days and she couldn't duplicate the problem. She used it for parts runs to get it up to temp, tried it cold, tested pressure. No issues.
I took it back and used it yesterday and it acted up one more time (sputtering idle for a bit) OBD1, so no CEL.
Ideas?