89 Iroc no start hot.
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89 Iroc no start hot.
My 89 350 Iroc cold starts fine, with 2 cranks. Once the engine comes up to operating temperature, after driving it a few miles, I shut it off. Take care of whatever business I have to, then return to the car. Turn the key & nothing. Fuel pump pressurizes the lines & that's all. Replaced the battery & starter. That was fun. Still doin the same thing. Once hot, no start. After about 3 hours, with the hood closed, it fires right up & runs fine. I'm sure that if I opened the hood, it would cool faster. Took it to a local shop & they couldn't find anything. Anybody here have any ideas? 49k mile car.
#3
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Re: 89 Iroc no start hot.
Nothing as in no crank, or nothing as in it just spins with no combustion?
My hot start issue was bad injectors. It's pretty common, I'd start by ohming them cold and hot.
My hot start issue was bad injectors. It's pretty common, I'd start by ohming them cold and hot.
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Re: 89 Iroc no start hot.
Forgot to mention that the first thing I did was replace all the injectors, as 3 of them were hella clogged.
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Re: 89 Iroc no start hot.
Rust. Replaced the fuel filter, drained the fuel tank & scoped it. Tank was amazingly clean for being 31 years old.
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Re: 89 Iroc no start hot.
[QUOTE=Komet;6454775]Nothing as in no crank, or nothing as in it just spins with no combustion?
When I turn the key, nothing happens. It's like there's no engine under the hood. Total silence, outside of the fuel pump pressurizing the lines.
When I turn the key, nothing happens. It's like there's no engine under the hood. Total silence, outside of the fuel pump pressurizing the lines.
#9
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Re: 89 Iroc no start hot.
That sounds like a VATS problem maybe. Do you still use the key with the pellet in it? Do you have another key? Not sure what the hot start would have to do with it but seem like you've tried the usual stuff.
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Re: 89 Iroc no start hot.
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Re: 89 Iroc no start hot.
Failure to crank under those conditions could be a classic older Chevy problem. When the starter solenoid gets hot it requires more voltage to engage the starer than the factory (older) wiring can provide.
After the engine cools down some it will work again.
The solution I've used is to install a relay under the hood that is triggered by the start wire and connects battery power to the s terminal on the solenoid when activated.
Kits are available: https://www.summitracing.com/parts/prf-30202
After the engine cools down some it will work again.
The solution I've used is to install a relay under the hood that is triggered by the start wire and connects battery power to the s terminal on the solenoid when activated.
Kits are available: https://www.summitracing.com/parts/prf-30202
#13
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Re: 89 Iroc no start hot.
Well, you can test if it's VATS by bypassing the start enable relay in the driver's footwell. Make a jumper out of thick wire and two male spade terminals. If it goes from no cranking to cranking after the bypass, you know that relay isn't being energized by VATS.
edit: VATS also disables the injectors so don't crank it forever this way if it does crank, this is just for testing.
I'd also recommend closely inspecting battery cables and all wiring going to the starter area for burns, breaks, splits, etc.
edit: VATS also disables the injectors so don't crank it forever this way if it does crank, this is just for testing.
I'd also recommend closely inspecting battery cables and all wiring going to the starter area for burns, breaks, splits, etc.
Last edited by Komet; 01-26-2022 at 10:32 PM.
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Re: 89 Iroc no start hot.
Well, you can test if it's VATS by bypassing the start enable relay in the driver's footwell. Make a jumper out of thick wire and two male spade terminals. If it goes from no cranking to cranking after the bypass, you know that relay isn't being energized by VATS.
edit: VATS also disables the injectors so don't crank it forever this way if it does crank, this is just for testing.
I'd also recommend closely inspecting battery cables and all wiring going to the starter area for burns, breaks, splits, etc.
edit: VATS also disables the injectors so don't crank it forever this way if it does crank, this is just for testing.
I'd also recommend closely inspecting battery cables and all wiring going to the starter area for burns, breaks, splits, etc.
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Re: 89 Iroc no start hot.
It's not my daily driver, so I can only work on it on weekends. I work long days & do not feel like beating my head against the car on week nights.
#18
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Re: 89 Iroc no start hot.
Easy check when hot and no start. Turn headlights on, try the starter. If the lights go out and stay out you have a bad battery cable or connection. The high current draw of the starter opens the circuit, the current draw of the headlights keeps it open. Heat and resistance deal.
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Re: 89 Iroc no start hot.
I think the first thing to do would be to see if you are getting voltage to the starter / solenoid when you turn the key.
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Re: 89 Iroc no start hot.
Well, you can test if it's VATS by bypassing the start enable relay in the driver's footwell. Make a jumper out of thick wire and two male spade terminals. If it goes from no cranking to cranking after the bypass, you know that relay isn't being energized by VATS.
edit: VATS also disables the injectors so don't crank it forever this way if it does crank, this is just for testing.
I'd also recommend closely inspecting battery cables and all wiring going to the starter area for burns, breaks, splits, etc.
edit: VATS also disables the injectors so don't crank it forever this way if it does crank, this is just for testing.
I'd also recommend closely inspecting battery cables and all wiring going to the starter area for burns, breaks, splits, etc.
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Re: 89 Iroc no start hot.
My 89 350 Iroc cold starts fine, with 2 cranks. Once the engine comes up to operating temperature, after driving it a few miles, I shut it off. Take care of whatever business I have to, then return to the car. Turn the key & nothing. Fuel pump pressurizes the lines & that's all. Replaced the battery & starter. That was fun. Still doin the same thing. Once hot, no start. After about 3 hours, with the hood closed, it fires right up & runs fine. I'm sure that if I opened the hood, it would cool faster. Took it to a local shop & they couldn't find anything. Anybody here have any ideas? 49k mile car.
#23
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Car: 3 Trans Ams & an Iroc Z
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Transmission: Birds manual, Iroc auto
Axle/Gears: 342
#24
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