Crossfire shutting off
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Crossfire shutting off
I'm having issues with an 83 z28 crossfire . I have replaced the fuel pump. Fuel pump relay switch. Ignition switch and the oil pressure sending switch. All due to trouble shooting and fails. Now she will give me five starts and runs. But will shut off mid run after the fifth start. And then after a day or so. Starts up and does the same thing. What else cod I be overlooking? There is no in line fuse. And I don't feel it's a bad ground. Because I don't have to do anything but let it sit. Then it starts..
Joined: Sep 2005
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Crossfire shutting off
Fuel/air, spark, compression.
The magic "Big 3".
Which one goes away after the fifth start?
Don't get bogged down in a bunch of "changed this replaced that now what". Fuel/air, spark, compression. It's just not that hard.
Compression rarely "goes away" in this kind of situation. That narrows it down to fuel/air and spark.
Air also rarely goes away. For at least most of my time on this planet, the air has been reasonably consistent. There was ONE major blip around 252 million years ago, it REALLY SUCKED for awhile there maybe 20 million more or less, but other than that, for the last billion and a half or so, it's been pretty consistent. So... probably not air.
Awright, fuel, or spark. Kind of a no-brainer.
Squirt some starting fluid into the TBs. Just a bit; maybe 2 seconds into each. Does it start RIGHT UP? Yes/no:
Yes: you have a fuel system problem. Go to work on the fuel system.
No: you have a spark problem. Work on the ignition system.
See, that wasn't so hard, now was it?
The only time you'll have an issue, is if the problem is the distributor. Specifically in the pickup coil part of it. Because, that's BOTH what produces spark, AND, what tells the ECM that the engine is turning and therefore needs fuel. Butt hay, we'll burn that bridge when we get to it. Do the simple thing first.
The magic "Big 3".
Which one goes away after the fifth start?
Don't get bogged down in a bunch of "changed this replaced that now what". Fuel/air, spark, compression. It's just not that hard.
Compression rarely "goes away" in this kind of situation. That narrows it down to fuel/air and spark.
Air also rarely goes away. For at least most of my time on this planet, the air has been reasonably consistent. There was ONE major blip around 252 million years ago, it REALLY SUCKED for awhile there maybe 20 million more or less, but other than that, for the last billion and a half or so, it's been pretty consistent. So... probably not air.
Awright, fuel, or spark. Kind of a no-brainer.
Squirt some starting fluid into the TBs. Just a bit; maybe 2 seconds into each. Does it start RIGHT UP? Yes/no:
Yes: you have a fuel system problem. Go to work on the fuel system.
No: you have a spark problem. Work on the ignition system.
See, that wasn't so hard, now was it?
The only time you'll have an issue, is if the problem is the distributor. Specifically in the pickup coil part of it. Because, that's BOTH what produces spark, AND, what tells the ECM that the engine is turning and therefore needs fuel. Butt hay, we'll burn that bridge when we get to it. Do the simple thing first.
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Joined: Sep 2018
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Re: Crossfire shutting off
The power to the fuel pump that's intank. Is what shuts off. So the car stalls. As far as I know. That chain reaction starts from the ignition switch from the turn key. That receives power from the battery. It then switches on the power to the fuel pump. If the oil pressure is to low the oil pressure sending switch shuts off power to the fuel pump too. But all are new. And nothing has to be replaced or switched. It just starts back up. A day or two later
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