Injection Issue
Thread Starter
2nd Gear
Joined: Jun 2025
Posts: 2
Likes: 0
Injection Issue
I have a 1982 with Crossfire Injection which is new to me.
When I took possession of the car, it was running and driving, but the idle was "hunting," sporadic, and would occasionally stall out.
I changed both Idle Air Control Valves and the idle smoothed out somewhat (not perfect, but it would still run).
Less than 50 miles later, I'm broken down on the side of the road, unable to start the car.
Upon start-up, both throttle bodies are spraying, what seems to me, an excessive amount of fuel.
It will fire off, but then both TBIs cut out at the exact same time, after about 1 second of running.
I'm a decent mechanic, but not familiar with the '82 Crossfire system.
Where do I go from here?
Any help from the experts would be greatly appreciated.
When I took possession of the car, it was running and driving, but the idle was "hunting," sporadic, and would occasionally stall out.
I changed both Idle Air Control Valves and the idle smoothed out somewhat (not perfect, but it would still run).
Less than 50 miles later, I'm broken down on the side of the road, unable to start the car.
Upon start-up, both throttle bodies are spraying, what seems to me, an excessive amount of fuel.
It will fire off, but then both TBIs cut out at the exact same time, after about 1 second of running.
I'm a decent mechanic, but not familiar with the '82 Crossfire system.
Where do I go from here?
Any help from the experts would be greatly appreciated.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Have you checked the condition and/or cleaned the sensor wires in the mass flow sensor (air intake). Those wires can either be damaged or just dirty. Air flow is determined by how much resistance is in those wires. Base assumptions are that those heated wires are clean and open to the incoming air. Incoming air will cool the wires and change their resistance. If wires are dirty, they don't cool properly and provide erroneous signals to the ECU. Your fix MAY be as simple as cleaning those wires. Many other causes are "in play", but that is a simple one to check off the list.
Instructor
Joined: Aug 2023
Posts: 212
Likes: 44
From: San Antonio, TX
If it looks like a shower head spraying/dumping fuel in the throttle body then that is likely a Coolant Temperature Sensor (CTS) issue. That is found just above the water pump on the front of the block. If that comes disconnected the ECM goes crazy and dumps fuel. I think it thinks that the engine is cold and needs lots of fuel to get it going. Check the wiring and make sure there's no breaks or anything like that. Any time I've unintentionally left the CTS disconnected that's what I would experience.
Melting Slicks
Joined: May 2021
Posts: 2,291
Likes: 1,332
From: Fleming Island, FL
To the OP I'm not going to guess what you problem is. I do recommend buying a scanner to read the data stream.
Melting Slicks
Joined: May 2021
Posts: 2,291
Likes: 1,332
From: Fleming Island, FL
If it looks like a shower head spraying/dumping fuel in the throttle body then that is likely a Coolant Temperature Sensor (CTS) issue. That is found just above the water pump on the front of the block. If that comes disconnected the ECM goes crazy and dumps fuel. I think it thinks that the engine is cold and needs lots of fuel to get it going. Check the wiring and make sure there's no breaks or anything like that. Any time I've unintentionally left the CTS disconnected that's what I would experience.
Instructor
Joined: Aug 2023
Posts: 212
Likes: 44
From: San Antonio, TX
The CFI system doesn't have a mass air flow sensor instead it's a speed density system that calculates RPM, TPS, and MAP sensors for it's fuel calibration.
To the OP I'm not going to guess what you problem is. I do recommend buying a scanner to read the data stream.
To the OP I'm not going to guess what you problem is. I do recommend buying a scanner to read the data stream.
Melting Slicks
Joined: Feb 2018
Posts: 2,331
Likes: 725
From: Marietta GA
If you are still experiencing engine problems, it might be wise to get a 1982 Chevrolet Corvette Service Manual. I have a 1988 FIERO and the engine started having idling problems. The FIERO Service manual was very helpful, I even found a modern day scanner that will read the trouble codes (instead of trying to count the flashing light). Good Luck
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Drifting
Joined: Dec 2016
Posts: 1,391
Likes: 223
Have you checked the condition and/or cleaned the sensor wires in the mass flow sensor (air intake). Those wires can either be damaged or just dirty. Air flow is determined by how much resistance is in those wires. Base assumptions are that those heated wires are clean and open to the incoming air. Incoming air will cool the wires and change their resistance. If wires are dirty, they don't cool properly and provide erroneous signals to the ECU. Your fix MAY be as simple as cleaning those wires. Many other causes are "in play", but that is a simple one to check off the list.