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Recently acquired an 84 with stock crossfire injection. The car has apparently been garaged for an extended period of time. A few days later the front injector started an intermittent shut down. Starting cold it will usually start fine and warm up, usually . After a mile or two it shuts down altogether and may or may not correct itself. It may start and run fine an hour later or not. The next day it will start and run fine, giving me hope that the work done the night before corrected the issue. Only to be dashed a mile down the road when it cuts out again.
Drained the old fuel and replaced with 93 and Seafoam. Throwing code for MAP sensor. Replaced MAP sensor, front injector, plugs, checked fuses and traced and checked wires and connectors. Condition persists.
I have considerable experience with older model Corvettes but this Crossfire system is a different creature altogether. I don't want to just throw parts at it and continue to beat my head against the wall. Any advice on where to go from here would be greatly appreciated.
When the car dies, is it up at operating temperature? My thought is that something ignition related could be getting heat-soaked then freaks out (technical term, I know), only to be fine again once the car cools off.
Welcome to the Crossfire club. We are the last of a dying breed. As you can tell, these systems have a lot of personality...
Recently acquired an 84 with stock crossfire injection. The car has apparently been garaged for an extended period of time. A few days later the front injector started an intermittent shut down. Starting cold it will usually start fine and warm up, usually . After a mile or two it shuts down altogether and may or may not correct itself. It may start and run fine an hour later or not. The next day it will start and run fine, giving me hope that the work done the night before corrected the issue. Only to be dashed a mile down the road when it cuts out again.
Drained the old fuel and replaced with 93 and Seafoam. Throwing code for MAP sensor. Replaced MAP sensor, front injector, plugs, checked fuses and traced and checked wires and connectors. Condition persists.
I have considerable experience with older model Corvettes but this Crossfire system is a different creature altogether. I don't want to just throw parts at it and continue to beat my head against the wall. Any advice on where to go from here would be greatly appreciated.
If the rear injector is normal and the front shuts down, then it is a fairly isolated problem. It is not ignition related, or any other sensor.
Each injector has it's own power supply and separate fuses, With ignition on each injector should have a constant 12V power on one pin.
Other side of each injector is grounded thru separate drivers in the ECU.
If the rear injector is normal and the front shuts down, then it is a fairly isolated problem. It is not ignition related, or any other sensor.
Each injector has it's own power supply and separate fuses, With ignition on each injector should have a constant 12V power on one pin.
Other side of each injector is grounded thru separate drivers in the ECU.
It is consistently the front injector. It does not seem to make a difference if up to temp or cold, immediately on start up or ten minutes down the road. The common denominator is always that injector. Is it safe to assume, if the wiring back to the ECM is sound, the problem is the Ecm? I appreciate the help.
It is consistently the front injector. It does not seem to make a difference if up to temp or cold, immediately on start up or ten minutes down the road. The common denominator is always that injector. Is it safe to assume, if the wiring back to the ECM is sound, the problem is the Ecm? I appreciate the help.
I don't think that it is the ECM. I would suggest making some changes to eliminate. You could do some temporary wiring to swap the feed to each injector.
If the problem stays with the front injector, then it is probably the injector that is faulty.
If the problem moves to the reat injector then the injectors are good.
Next step would be to cross feed power or driver wires only. Depending of if the problem moves you can rule out power supply or ECU.
You can use this type of terminal block to connect a wire to the injector.
84 Crossfire issues
