Cold start injector question
Thread Starter
Intermediate
Joined: Jun 2021
Posts: 29
Likes: 3
From: Kentucky
Cold start injector question
I have a 1985 Corvette and I’m in the process of replacing the fuel injectors and other stuff. I bought a cold start block off plate and was wondering if that will cause an engine code or not? Thanks for any advice.
Pro
Joined: Dec 2018
Posts: 728
Likes: 420
From: Wisconsin
2023 Corvette of the Year Finalist - Modified
2022 C4 of the Year Winner - Modified
Finalist 2020 C4 of the Year - Modified
It won't cause any codes but will likely result in the engine cranking longer before it starts in colder temperatures. The cold start injector isn't connected to the ECM.
Why are you removing it?
Why are you removing it?
Team Owner
Joined: Sep 2001
Posts: 62,066
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
No it won't come back to the ECM, so no code will set.
You may have some issues cranking up some and then initially running on colder mornings. The ECM would be tuned in 85 to expect that CSI to be working in its built-in fuel tables.
You may have some issues cranking up some and then initially running on colder mornings. The ECM would be tuned in 85 to expect that CSI to be working in its built-in fuel tables.
Melting Slicks
Joined: Nov 2016
Posts: 2,148
Likes: 2,978
From: So Cal
2023 C4 of the Year Finalist - Unmodified
You're about to create a problem where one doesn't now exist.
The Cold Start Injector assists with "cold start" up to 95 deg F of coolant temp. The CSI is only active while the key is in START, there is no power to the CSI system at any time other than in START. You will notice longer crank times, and it may not start at all depending on how "cold" it is. I had an 88 that wouldn't start the first start of the day at 70F. The fuse for the CSI was blown, and when replaced it fired right up..
The Cold Start Injector assists with "cold start" up to 95 deg F of coolant temp. The CSI is only active while the key is in START, there is no power to the CSI system at any time other than in START. You will notice longer crank times, and it may not start at all depending on how "cold" it is. I had an 88 that wouldn't start the first start of the day at 70F. The fuse for the CSI was blown, and when replaced it fired right up..
Last edited by IHBD; Feb 15, 2022 at 11:23 AM.
Instructor
Joined: Jan 2021
Posts: 146
Likes: 37
Yep I actually had mine off for a bit because I was having issues and suspected a leaky injector - starting it was a real pain in the *** compared to having the CSI on. I recommend keeping it unless you're going to alter the tune to bypass it.
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
So do this:
pick a cold morning
unplug it.
start your car. See how long it takes.
Start it the next day plugged in assuming it’s around the same temp.
then pick 40 degree days, 50 degree days, etc.
it’s your call
pick a cold morning
unplug it.
start your car. See how long it takes.
Start it the next day plugged in assuming it’s around the same temp.
then pick 40 degree days, 50 degree days, etc.
it’s your call
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