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C4 wont stay running

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Old Jan 27, 2024 | 09:13 AM
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Default C4 wont stay running
Hello everyone, i am a new member and in need of some help. i have a 1987 convertible that has a rebuilt motor and wont stay running.
1. i change fuel pump and sending unit
2 changed fuel injectors and fuel filter
3. changed fuel pressure regulator
4. changed coil and modules and spark pugs and wires
i have plenty of fuel pressure and spark, fuel tank is full.
i can start it for 30 seconds at a time and it stalls out.
what am i missing, i checked timing several times and it looks good.
any advice would be greatly appreciated and thank you in advance.
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Old Jan 27, 2024 | 09:23 AM
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How does it run in those 30 seconds? Rich w fuel smell? Or stumbly? ( thats a word righ?)
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Old Jan 27, 2024 | 09:58 AM
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Originally Posted by 2011KLR
How does it run in those 30 seconds? Rich w fuel smell? Or stumbly? ( thats a word righ?)
Hi 2011KLR, it runs (stumbily) RPMs at 600
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Old Jan 27, 2024 | 10:27 AM
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600 RPMs isnt teribly low but is a bit low... I didnt see you mention your IAC... Have you done minimum idle/air set procedure?
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Old Jan 27, 2024 | 10:54 AM
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I didn’t do a iac would that cause a stall after 30 seconds
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Old Jan 27, 2024 | 11:11 AM
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Specifically 30 seconds, not likely.

read up on the min air adjistment. Do that, see if it helps.
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Old Jan 27, 2024 | 11:12 AM
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Don't want to sound too obvious but have you checked the battery?

I drove a C4 that ran "stumbly" and it needed a battery.
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Old Jan 27, 2024 | 11:42 AM
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Battery is brand new, I will try the iac adjustment
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Old Jan 27, 2024 | 12:36 PM
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I did the iac reset, on my right side exhaust manifold is spitting fuel my injectors are from South Bay fuel injectors and they are brand new
IAT wasn’t connected and now it’s running but I have a very small amount of fuel coming from right side exhaust manifold
Last edited by danielamanda1; Jan 27, 2024 at 06:51 PM.
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Old Jan 27, 2024 | 07:22 PM
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Itsounds like youve found something to fix. 😎
Then see where you stand.
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Old Jan 28, 2024 | 08:55 AM
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You must have a cylinder or two not firing. Are your new injectors the right size. Dan
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