My 91 Z28 Will Not Crank Up After Being Driven
#1
My 91 Z28 Will Not Crank Up After Being Driven
I need some help I have a 91 camaro z28 5.7L 350 and it will not crank up for about a hour after it has been driven. the fuel pump and ecm has been changed. Can anyone offer some advice.
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Re: My 91 Z28 Will Not Crank Up After Being Driven
No crank or starter click? With the key on does the security light stay on? If i had to take a wild guess id say its related to VATs. Vehicle Anti-Theft System.
My car used to do it randomly, it'd be fine then id park it somewhere and it wouldn't crank and sometimes it would 20 mins later or sometimes a day later.
My car used to do it randomly, it'd be fine then id park it somewhere and it wouldn't crank and sometimes it would 20 mins later or sometimes a day later.
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Re: My 91 Z28 Will Not Crank Up After Being Driven
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Re: My 91 Z28 Will Not Crank Up After Being Driven
Before you start replacing starters or steering columns, you need to answer two important questions:
- do you have spark?
- what's the fuel pressure?
Lou
- do you have spark?
- what's the fuel pressure?
Lou
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Car: '91 Z28 convertible
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Re: My 91 Z28 Will Not Crank Up After Being Driven
Alright.
Spray some carb cleaner down the intake. If it starts, you have a fuel delivery problem.
It will die afterwards, of course.
You can also turn the key on and ground the blue (or green) wire on an injector for a second. Try staring again. If it starts, the injectors are good.
Check the connectors and wires on the back of the distributor and top of the coil. If the ECM doesn't see any pulses from the tach/coil, it won't inject any fuel.
Let us know.
Lou
Spray some carb cleaner down the intake. If it starts, you have a fuel delivery problem.
It will die afterwards, of course.
You can also turn the key on and ground the blue (or green) wire on an injector for a second. Try staring again. If it starts, the injectors are good.
Check the connectors and wires on the back of the distributor and top of the coil. If the ECM doesn't see any pulses from the tach/coil, it won't inject any fuel.
Let us know.
Lou
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#8
Re: My 91 Z28 Will Not Crank Up After Being Driven
After the car has been driven and i try to start it again but it will not crank. The fuel pressure is 45 psi at all time and it sparks everytime but the no injector spray. The fuel pump, the fuel filter, ecm chip, distributor cap, distributor rotor, the spark plugs have all been changed. checked the timing. But the injector will not spary any fuel.
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Re: My 91 Z28 Will Not Crank Up After Being Driven
Here you said that it turns over (aka crank) but today you say it won't crank. That's creating confusion.
The verb "crank" means that the starter is turning the engine. It comes from the old ages when cars had crank handles and the driver had to manually crank the car up.
So we need to make sure that we understand what's going on here.
Does the engine crank (starter turning it)?
Does it fire up (run) at all?
Lou
The verb "crank" means that the starter is turning the engine. It comes from the old ages when cars had crank handles and the driver had to manually crank the car up.
So we need to make sure that we understand what's going on here.
Does the engine crank (starter turning it)?
Does it fire up (run) at all?
Lou
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Re: My 91 Z28 Will Not Crank Up After Being Driven
Ok, you need to be clear here.
Youre driving around, car shuts off. Thats clear.
When you go to restart, does the motor spin? Yes or no.
If no, check the starter solenoid.
If yes, that determines that the engine "cranks" and doesnt "restart."
How did you check fuel and spark? Mine had this same problem and what was happening is the coilpack was getting hot and shut off. I grab the coil and its like, smoking hot. I put a replacement coil in and the car started right up.
Youre driving around, car shuts off. Thats clear.
When you go to restart, does the motor spin? Yes or no.
If no, check the starter solenoid.
If yes, that determines that the engine "cranks" and doesnt "restart."
How did you check fuel and spark? Mine had this same problem and what was happening is the coilpack was getting hot and shut off. I grab the coil and its like, smoking hot. I put a replacement coil in and the car started right up.
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Re: My 91 Z28 Will Not Crank Up After Being Driven
Ok, you need to be clear here.
Youre driving around, car shuts off. Thats clear.
When you go to restart, does the motor spin? Yes or no.
If no, check the starter solenoid.
If yes, that determines that the engine "cranks" and doesnt "restart."
How did you check fuel and spark? Mine had this same problem and what was happening is the coilpack was getting hot and shut off. I grab the coil and its like, smoking hot. I put a replacement coil in and the car started right up.
Youre driving around, car shuts off. Thats clear.
When you go to restart, does the motor spin? Yes or no.
If no, check the starter solenoid.
If yes, that determines that the engine "cranks" and doesnt "restart."
How did you check fuel and spark? Mine had this same problem and what was happening is the coilpack was getting hot and shut off. I grab the coil and its like, smoking hot. I put a replacement coil in and the car started right up.
#13
Re: My 91 Z28 Will Not Crank Up After Being Driven
correct i can start it, drive it, and turn it off but it won't restart. i have 45 psi fuel pressure and i have spark everytime but the injectors are not spraying
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Re: My 91 Z28 Will Not Crank Up After Being Driven
Alright, it's clear now.
Did you try grounding the blue (or green) wire on the injectors? Did it fire up for a sec?
What does the security indicator do when you turn the key on on restart?
Can you swap ECMs with a friend?
Lou
Did you try grounding the blue (or green) wire on the injectors? Did it fire up for a sec?
What does the security indicator do when you turn the key on on restart?
Can you swap ECMs with a friend?
Lou
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Re: My 91 Z28 Will Not Crank Up After Being Driven
That is definately strange. Most times when our cars lose injector pulse they dont have spark due to the module in the distributor. My next stop would be the ECU.
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Re: My 91 Z28 Will Not Crank Up After Being Driven
replace the starter.
10-1, that's your problem. what happens, is when the starter sylenoid gets hot, it doesn't work. that's why you have to wait an hour or so.. so it can cool down. then it fires up again.
had this issue many times. replace the starter.
10-1, that's your problem. what happens, is when the starter sylenoid gets hot, it doesn't work. that's why you have to wait an hour or so.. so it can cool down. then it fires up again.
had this issue many times. replace the starter.
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Re: My 91 Z28 Will Not Crank Up After Being Driven
that makes absoluetely no sense since the starter is working flawlessly. It cranks, has spark, but no injector pulse, putting another starter on it isn't going to pulse the injectors. Have you read this thread at all?
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