1990 corvette idling too high
Thread Starter
Intermediate
Joined: Jul 2013
Posts: 44
Likes: 0
1990 corvette idling too high
I had an injector problem and had to replace them. Once replaced the engine ran good but it would not idle down. When cranked it goes up to around 1500 - 1800 then idles back to around 1000. Does anyone have a solution?
Drifting
Joined: Jul 2012
Posts: 1,796
Likes: 14
From: Nampa Idaho
Sounds like a vacuum leak or maybe your air idle control valve?
Was it doing this before the injectors were replaced?
http://www.ecklerscorvette.com/corve...1990-1995.html
Was it doing this before the injectors were replaced?
http://www.ecklerscorvette.com/corve...1990-1995.html
Team Owner
Joined: Jul 2004
Posts: 28,432
Likes: 3,285
From: Hartford WI
Where did you get the injectors from? If it is from some internet source that nobody knows, it is possible they got a bad or mismatched set. Are you SURE you checked for vacuum leaks? If so check one more time. Use a propane torch on your hoses. One might be cracked.
Race Director
Joined: Apr 2002
Posts: 10,036
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From: Anaheim CA
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Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
If all you did was replace injectors they could be undersized. High idle is vacuum leak, or a lean condition. Buy a cable here:
http://www.reddevilriver.com/aldl.html
This will allow you to datalog the vehicle and observe what's going on. Look at BLM (block learn memory) counts. 128 is perfect, and 160 is lean, and 108 is rich. You can identify if you have a lean condition. Sorry, but a catalog store is not a place to buy injectors unless you know exactly what you're getting. You could borrow a good scanner and make a similar observation also. I've had nothing but trouble dealing with cars that have used these Standard products injectors.
http://www.reddevilriver.com/aldl.html
This will allow you to datalog the vehicle and observe what's going on. Look at BLM (block learn memory) counts. 128 is perfect, and 160 is lean, and 108 is rich. You can identify if you have a lean condition. Sorry, but a catalog store is not a place to buy injectors unless you know exactly what you're getting. You could borrow a good scanner and make a similar observation also. I've had nothing but trouble dealing with cars that have used these Standard products injectors.
Safety Car
Joined: Jan 2006
Posts: 3,940
Likes: 42
From: shavertown Pa.
Spray some carb cleaner or brake cleaner around the injectors and listen for a stumble, if you are getting a stumble that is the engine trying to burn the carb cleaner getting in around the injectors.
Could be the injectors are the wrong size for the holes or the donuts on the bottom of the injectors are broken letting air suck in (vac leak).
Could be the injectors are the wrong size for the holes or the donuts on the bottom of the injectors are broken letting air suck in (vac leak).
Team Owner
Joined: Jul 2004
Posts: 28,432
Likes: 3,285
From: Hartford WI