Digital Dash Issue
Thread Starter
5th Gear
Joined: Sep 2014
Posts: 5
Likes: 0
From: Acton California
Digital Dash Issue
Just purchased an exceptionally clean 1984 C4 with 42,000+ original miles. Well kept car. My 6th vette.
My issue is this. I was happily cruising home at 65 mph, turned on the a/c and shortly thereafter the oil pressure idiot light came on and the pressure was reading 8. (I just change the oil Sunday and knew I was topped off. Smog tested last week and the car came in way below average across the board.)
I reduced speed and the pressure went to 15, accelerated and it went back to 8. Shut off the a/c to reduce the load and pressure went to 35. Turned the a/c back on and down to 8 again. A/c back off pressure back to 35.
Now I know the a/c is in no way responsible mechanically for an oil pressure drop, so it must be a digital dash issue since the reading only drops with the a/c on.
Anyone with a clue to point me in the right direction?
Also according to the fuel mileage average readout I'm getting 21.9mpg, but the range readout is way off showing 80 miles left with half a tank of gas left.
I've read through the forum and am very impressed with your knowledge and courtesy.
Thanks
My issue is this. I was happily cruising home at 65 mph, turned on the a/c and shortly thereafter the oil pressure idiot light came on and the pressure was reading 8. (I just change the oil Sunday and knew I was topped off. Smog tested last week and the car came in way below average across the board.)
I reduced speed and the pressure went to 15, accelerated and it went back to 8. Shut off the a/c to reduce the load and pressure went to 35. Turned the a/c back on and down to 8 again. A/c back off pressure back to 35.
Now I know the a/c is in no way responsible mechanically for an oil pressure drop, so it must be a digital dash issue since the reading only drops with the a/c on.
Anyone with a clue to point me in the right direction?
Also according to the fuel mileage average readout I'm getting 21.9mpg, but the range readout is way off showing 80 miles left with half a tank of gas left.
I've read through the forum and am very impressed with your knowledge and courtesy.
Thanks
Team Owner
Joined: Sep 2003
Posts: 20,179
Likes: 673
From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
Condition of grounds?
I'm not worried about oil pressure. Of course a mechanical gauge is the only real confirmation.
I'm not worried about oil pressure. Of course a mechanical gauge is the only real confirmation.
Thread Starter
5th Gear
Joined: Sep 2014
Posts: 5
Likes: 0
From: Acton California
Thanks. I will follow-up after work today on grounds.
Oil Producer
Joined: Apr 2014
Posts: 9,388
Likes: 2,749
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
Thread Starter
5th Gear
Joined: Sep 2014
Posts: 5
Likes: 0
From: Acton California
I discovered the same identical problem discussed on another vette site.
Thought it would be a wiring issue as several of you suggested.
http://www.corvetteactioncenter.com/...es-unique.html
Thanks again for your input and courtesy.
Thought it would be a wiring issue as several of you suggested.
http://www.corvetteactioncenter.com/...es-unique.html
Thanks again for your input and courtesy.