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87 TPI 305 sputters and dies at idle after injector replacement

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Old Sep 22, 2024 | 03:27 PM
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Car: 1987 Trans Am
Engine: 305 TPI
Transmission: 700R4
87 TPI 305 sputters and dies at idle after injector replacement

Clearly I messed something up, so I went back through the injector install process and still had the same results.
All vacuum lines are connected
If I don’t have my foot on the gas then it will slowly sputter out and die or just die instantly.
The only thing I can think of is a possible vacuum leak at the cold start injector.
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Old Sep 22, 2024 | 03:52 PM
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Re: 87 TPI 305 sputters and dies at idle after injector replacement

What injectors did you take out?
What did you put in?
What is the tune?
Did you disturb the CSI? Is there in fact a vac leeeek there? (spray can of carb cleaner, NOT brake parts cleaner, is your friend)
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Old Sep 22, 2024 | 04:49 PM
  #3  
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Car: 1987 Trans Am
Engine: 305 TPI
Transmission: 700R4
Re: 87 TPI 305 sputters and dies at idle after injector replacement

Replaced all 8 stock injectors with stock injectors. Stock tune, almost everything on the car is stock. And yes I took out the cold start injector to do the job, I’ll have to see if theres a leak there once I have a second person to keep the car running when I check.
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Old Sep 22, 2024 | 04:52 PM
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Car: 1967 Camaro, 91 z28
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Re: 87 TPI 305 sputters and dies at idle after injector replacement

Csi only is active when cranking. Power goes through the starter to the timer switch the to csi. So unless it’s stuck and leaking it’s not he cause.What brand of injectors ? Hopefully not 30-40 a set of eBay specials.
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Old Sep 22, 2024 | 05:00 PM
  #5  
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Car: 1987 Trans Am
Engine: 305 TPI
Transmission: 700R4
Re: 87 TPI 305 sputters and dies at idle after injector replacement

Originally Posted by Tuned Performance
Csi only is active when cranking. Power goes through the starter to the timer switch the to csi. So unless it’s stuck and leaking it’s not he cause.What brand of injectors ? Hopefully not 30-40 a set of eBay specials.
Not 100% sure of the brand I would have to check the box, but I saw a few videos recommending them as a stock replacement, and they did fix my injectors issues.
The only things I feel it could be is a vacuum leak somewhere or low fuel pressure.
But I don’t see what I could’ve done to cause low fuel pressure
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Old Sep 22, 2024 | 05:03 PM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 87 TPI 305 sputters and dies at idle after injector replacement

Originally Posted by drsnac
Not 100% sure of the brand I would have to check the box, but I saw a few videos recommending them as a stock replacement, and they did fix my injectors issues.
The only things I feel it could be is a vacuum leak somewhere or low fuel pressure.
But I don’t see what I could’ve done to cause low fuel pressure
what is fuel pressure ? Does it hold after the prime ?
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Old Sep 22, 2024 | 05:08 PM
  #7  
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Car: 1987 Trans Am
Engine: 305 TPI
Transmission: 700R4
Re: 87 TPI 305 sputters and dies at idle after injector replacement

Originally Posted by Tuned Performance
what is fuel pressure ? Does it hold after the prime ?
Still waiting on my fuel pressure tester to arrive, but when I releived the pressure last night to replace my fuel filter it seemed like the normal amount, not that that means anything as I was just judging it by eye.
Just the symptoms point to pressure or a bad vacuum leak. It runs great with my foot on the gas though.
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