strange problem
Thread Starter
Instructor
Joined: Nov 2008
Posts: 196
Likes: 3
strange problem
A strange problem came up on my 86. The fuel mileage and range will go to zero randomly. When they go to zero the idle speeds up to around 1k. They will come back to normal and the idle is okay. When they zero out when I am driving the car seems to run the okay with no problems. I have actually been sitting at a light when they would zero out and the car would want to move as the idle sped up.
Any ideas on this one? Oh, all other readouts are fine, as is everything else with the car running.
Any ideas on this one? Oh, all other readouts are fine, as is everything else with the car running.
Le Mans Master
Joined: Jul 2007
Posts: 5,356
Likes: 2
From: No HOA, New Hampshire
Cruise-In X Veteran
St. Jude Donor '09
It sounds to me like a ground problem. Every time I do any work on the Vette I look for the closest ground point and clean it even if it is not causing any problems. 
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Have you done any work to the car since prior to the problem showing up....welding, jumpstarting....etc.? Does it only do the "0" when the fuel switch is set to "instant" or does it do in when switched to "average" also? Bad connections to, from or within the cluster might be a possibility as mentioned in the above post. It is also possible that there is a problem with the fuel level sender circuit. The fuel level gauge in the the early C4's can take up to 10 seconds to respond to a fuel level change....where as the MPG or Range are more quick to respond. Your problem sounds more like a cluster electronics issue to me though.
Thread Starter
Instructor
Joined: Nov 2008
Posts: 196
Likes: 3
Have you done any work to the car since prior to the problem showing up....welding, jumpstarting....etc.? Does it only do the "0" when the fuel switch is set to "instant" or does it do in when switched to "average" also? Bad connections to, from or within the cluster might be a possibility as mentioned in the above post. It is also possible that there is a problem with the fuel level sender circuit. The fuel level gauge in the the early C4's can take up to 10 seconds to respond to a fuel level change....where as the MPG or Range are more quick to respond. Your problem sounds more like a cluster electronics issue to me though.
No work had been done on the car. I did think the cluster was going bad. I don't understand how that would affect idle speed.
Oh, it doesn't matter if the fuel setting is instant or average.
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
