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post #1 of (permalink) Old 02-17-2019 Thread Starter
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Check Gauge light issue.

Our 95 Caprice 5.7L is still showing "Check Gauge" light and very slightly raising the throttle (while in Neutral) it goes out.
I have a new TPS (standard), Map sensor, I.A.C. all adjusted correctly with a very clean throttle body assy. NO codes. Battery is new, pos. & neg. cables and starter new because of dragging starter, corroded cable at starter and 7-yr old Duralast battery. Starts with a very strong "Zoom". Cold idle settles into a nice slower idle soon as expected. MAF sensor clean, Clean air filter.

Fuel pump, sending unit all good. Oil pressure and water temp. good. Cabin heat hot. All gauges reading normal. When ran for approx. 15-20 min as wife gets across town, sitting at a light, then the check gauge light shows up. Not check engine.

I have the GM repair manuals and it does not have a Check gauge troubleshoot area..... Has there been an upgrade. The publications dept. tell me that I don't have the books that I have in hand from a closed Chevrolet dealership. 178K mi.

I don't know if the brake pedal switch has an issue? I don't think my injectors are misfiring intermittently as they might could? I don't know if the Blue Streak replaced pcm might have an issue?

PLz Help guys..... I know someone has had to have had this issue too....I cant afford to pay for another car on disability...
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post #2 of (permalink) Old 02-17-2019
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On my 1999 Corvette, if the check gauge message and light illuminated, a chime would sound. It meant for the driver to check all the guages to determine if one was out-of-range, indicating a problem (such as low oil pressure, overheat, low tire pressure, etc.).

Do all of your gauges work properly? Are any reading inaccurately? I know you stated they were good.

I would suspect a defective oil pressure sending unit (switch) first, or a defective temperature sending unit second. Once a defective switch triggers a warning, however brief, it will turn on the check gauges light (and/or message and chime on some GM cars).

Generally, a defective oil pressure switch will show a drop in oil pressure when the engine oil gets hot at idle. Does the oil pressure light flicker at all during idle?

You can have hot HVAC output, but have a defective engine coolant temperature switch, which tells the computer that the vehicle is not warmed up fully (or is slow to warm up). Generally, that will set a code (with no check engine light) for slow engine warmup, usually meaning the thermostat is stuck open.

I would try the oil pressure switch and see if that corrects the problem. Since raising the idle speed (and raising the oil pressure) causes the check gauge light to go out, Id bet from afar that is your problem. The switch requires a special oil sending unit socket, and do NOT put addtional sealer on the threads (other than what comes on it). I would buy an ACDelco part, and not aftermarket. The OEM switch is inexpensive.

One other thought - if you use a cheap, aftermarket oil filter - that can cause low oil pressure at idle. I would use an ACDelco oil filter also.

Let us know what you determine.
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post #3 of (permalink) Old 03-03-2019 Thread Starter
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All at first I did change the coolant temperature switch mounted on the front of the water pump (or thermostat housing-hard to remember). Then the engine temperature switch on the passenger head.
The car then had a very old battery and starter (7yrs old) and the positive battery cable at the starter end was starting to corrode, so I replaced all of them at the first of the year. It now starts very strong again. New Ground cable too. Standard cables with rubber coating.The alternator is a Car Quest 140 amp newer one too.
It always runs without any flickering in the dash gauges. In the past I have changed the oil pressure gauge with an aftermarket I think without looking at receipts. In the past I did send off the dash cluster to get it to show the L.E.D speed indicator's again. I am wondering if there could be a small issue sending the check gauge light on? It now only comes on after driving it around town for some time between stores. After it has run for an extended period. I always let my vehicles warm up in my car port. Then take it around the neighborhood. Then a test run up to speed of 55mph on cruise for a short 8 mile jaunt before giving it a final-green light go-its ok again...
Now my wife has lost faith in the old gal. It has 178 k miles on it. I wonder if it now is either in the opti-spark, Blue Streak ECM, or the instrument cluster. The AC Delco spark plugs are still in good condition. Tomorrow I will check the injection pluses with the noid light. I have always used Lucas fuel additive. I am now using liquid-molly fuel injection cleaner just to boost the injection cleaning if needed, The OBD 1 aldl will not show any codes. My GM OBD 1 check engine will not work on the 5.7L.
Thank you all for your input
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