Long crank before start.
Drifting
Joined: Dec 2012
Posts: 1,504
Likes: 73
From: Georgetown TX
This is the article I was referring to about 89 ecu causing long cranking
https://tech.corvettecentral.com/200...tion-overview/
https://tech.corvettecentral.com/200...tion-overview/
Thread Starter
Advanced
Joined: Jan 2016
Posts: 62
Likes: 0
From: New York New York
Fuel pressure is fine, what exactly happens when you try and start the car, in other words what does it sound like? If you could get a video of that it could help us figure it out. Is the computer chip stock for a 1989? I would also look at your engine temperature sensor, the sensor may be reading incorrectly causing the engine to think it is warm when the engine is cold and not adding in enough starting fuel. The best way to do this is with a scanner.
Ok here is a video of it starting
mcguirjf - The pressure is not zero after shutting or before turning on the car.
mlmo - I want to rule out the ecu for now unless someone has a good way of testing that.
xrav22 - I only run 91 octane.
After the testing I did at the rail, can fuel related issues be eliminated as the cause at this point or does this need further investigation?
Last edited by silentgt; Jun 7, 2018 at 12:28 PM.
Safety Car
Joined: Sep 2001
Posts: 4,161
Likes: 554
From: Glenbeulah Wi
Ok here is a video of it starting https://youtu.be/6z7EorpbpOc . Usually its a longer crank than this but you get the idea. I don't know if the chip is stock as this car has had many owners. How do I tell? The problem with that theory is that it starts like this when its hot too so even if you are right, and its not detecting the cold correctly, it shouldn't do after it was just driven.
mcguirjf - The pressure is not zero after shutting or before turning on the car.
mlmo - I want to rule out the ecu for now unless someone has a good way of testing that.
xrav22 - I only run 91 octane.
After the testing I did at the rail, can fuel related issues be eliminated as the cause at this point or does this need further investigation?
mcguirjf - The pressure is not zero after shutting or before turning on the car.
mlmo - I want to rule out the ecu for now unless someone has a good way of testing that.
xrav22 - I only run 91 octane.
After the testing I did at the rail, can fuel related issues be eliminated as the cause at this point or does this need further investigation?
Thread Starter
Advanced
Joined: Jan 2016
Posts: 62
Likes: 0
From: New York New York
Ok so I tried something else today. I drove the car for 30 minutes and then shut it off and on three times. All three times it started in half a second of cranking. This is the behavior I'm expecting to happen when things are normal (at least that's how my more modern car starts). If the vette sits for say 30 minutes or longer, I start getting the longer crank as in the video. Is this normal for an older car like this or should I look into your temperature sensor theory?
Instructor
Joined: May 2005
Posts: 193
Likes: 8
From: West Islip NY
it is absolutely an 89 unique problem. try cranking for 3 or 4 seconds, stop, crank again and it will then start almost immediately. it can crank for 10- 15 seconds if you do not stop in between. my 89 and almost every other person I have spoken to has this issue. its the first year without a cold start injector. they got the tuning right in 90
Thread Starter
Advanced
Joined: Jan 2016
Posts: 62
Likes: 0
From: New York New York
it is absolutely an 89 unique problem. try cranking for 3 or 4 seconds, stop, crank again and it will then start almost immediately. it can crank for 10- 15 seconds if you do not stop in between. my 89 and almost every other person I have spoken to has this issue. its the first year without a cold start injector. they got the tuning right in 90
Damn, you are right. I tried this and it worked. I'm guessing there is no solution for the 89?
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