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My digital tach is out. The warning lights still work above it. Wondered if I am overlooking anything before I try to replace it. I checked fuses and looked through some wiring. First cadillac, didn't want to replace if I didn't have to. Thanks.

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I guess I'll tackle this on my own. I'm going to go rip out my whole dash to see if there is a way to try to test that unit. I obviously can't get trouble codes while it is out, but I do have other issues with it right now. Cheapest one I saw was 99 dollars. If anyone knows of a cheaper way please let me know.

Thanks.

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Have you checked for codes? A problematic tach can set 3 different codes. Ripping out the dash is not the way to proceed

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I can't check codes. It's a fixer upper. It doesn't run currently. (it does have fuel and fire and pressure). I just wanna make some headway today. What do you reccomend?

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I would put the TACH at the bottom of the list and get it running first

Since there are no codes possible at this point, what is it doing cranking, not cranking, etc Smell fuel? What is the fuel pressure? How did you check spark?

Does it crank? When did it run last, how did it stop running? Do you hear a vacuum leak under the hood when it cranks?

Does it crank fast?

Give some details

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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All right, sorry. I got it in janurary. It ran for about two weeks. I had a broken foot and ankles so this is my first oppurtunity to work on it.

To begin, I wanted the tach to work to check codes... Then I wanted to go from there. I'm hoping it'll turn something up instead of pulling my engine apart. I have spark, I grounded an old spark plug off of the wires to the block. Kinda medeivel, but you gotta do what you gotta do (at least I didn't hold it). Haven't measured psi of fuel, but I hit the release on my injectors and it sprayed instead of dribbled. I also put starting fluid direct, so fuel is not the issue. It drains my battery off of one start, and that is supposedly new.I think the reason for no start is

Crankshaft sensor

Ignition(friend said it happened to him)

Starter(I got that from you on here)

Voltage regulator(which means I tear out half my engine from the book)

Or god forbid it's out of time

There is plenty of more options, but I was hoping the computer on board would give me something so I wanted to start with the tach. I appreciate anything said and thanks for the time.

Bo

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And it does crank. Fuel can be smelled at the plugs . I'm not sure if it cranks fast, ithink if anything it's slow. Checked all vacuum hoses i saw. Stopped running after a short drive. Cranks like it wants to hit, which is why I tried starting fluid. (it's cheaper than a psi tester) I know this is all backyard mechanic stuff, but I have to use what I have. I don't want to waste money on this, but I will get her going soon and want to fix what's actually wrong.

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Haven't measured psi of fuel, but I hit the release on my injectors and it sprayed instead of dribbled. I also put starting fluid direct

What happened with the starting fluid? Just because the injectors spray does not mean they have enough pressure to start the engine. You really need a fuel pressure gauge to check the fuel pressure on a fuel injected car. 10 psi will spray, but is not enough to run the engine.

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Haven't measured psi of fuel, but I hit the release on my injectors and it sprayed instead of dribbled. I also put starting fluid direct

What happened with the starting fluid? Just because the injectors spray does not mean they have enough pressure to start the engine. You really need a fuel pressure gauge to check the fuel pressure on a fuel injected car. 10 psi will spray, but is not enough to run the engine.

The starting fluid wouldn't turn it over. Sorry, I don't think I'm clear online. I'm not really used to this.

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All right, sorry. I got it in janurary. It ran for about two weeks. I had a broken foot and ankles so this is my first oppurtunity to work on it.

To begin, I wanted the tach to work to check codes... Then I wanted to go from there. I'm hoping it'll turn something up instead of pulling my engine apart. I have spark, I grounded an old spark plug off of the wires to the block. Kinda medeivel, but you gotta do what you gotta do (at least I didn't hold it). Haven't measured psi of fuel, but I hit the release on my injectors and it sprayed instead of dribbled. I also put starting fluid direct, so fuel is not the issue. It drains my battery off of one start, and that is supposedly new.I think the reason for no start is

Crankshaft sensor

Ignition(friend said it happened to him)

Starter(I got that from you on here)

Voltage regulator(which means I tear out half my engine from the book)

Or god forbid it's out of time

There is plenty of more options, but I was hoping the computer on board would give me something so I wanted to start with the tach. I appreciate anything said and thanks for the time.

Bo

You said this "To begin, I wanted the tach to work to check codes... "

You don't need the TACH to check the codes, not sure what you are trying to say here. Have you tried to check the codes? The codes will come up in the DIC area

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Ranger is correct, get a fuel pressure gage, and see what the pressure is when you turn the key on

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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All right, sorry. I got it in janurary. It ran for about two weeks. I had a broken foot and ankles so this is my first oppurtunity to work on it.

To begin, I wanted the tach to work to check codes... Then I wanted to go from there. I'm hoping it'll turn something up instead of pulling my engine apart. I have spark, I grounded an old spark plug off of the wires to the block. Kinda medeivel, but you gotta do what you gotta do (at least I didn't hold it). Haven't measured psi of fuel, but I hit the release on my injectors and it sprayed instead of dribbled. I also put starting fluid direct, so fuel is not the issue. It drains my battery off of one start, and that is supposedly new.I think the reason for no start is

Crankshaft sensor

Ignition(friend said it happened to him)

Starter(I got that from you on here)

Voltage regulator(which means I tear out half my engine from the book)

Or god forbid it's out of time

There is plenty of more options, but I was hoping the computer on board would give me something so I wanted to start with the tach. I appreciate anything said and thanks for the time.

Bo

You said this "To begin, I wanted the tach to work to check codes... "

You don't need the TACH to check the codes, not sure what you are trying to say here. Have you tried to check the codes? The codes will come up in the DIC area

Perhaps he is referring incorrectly to the DIC as the tach....or possibly the whole IPC as a tach. Just a thought. Not everyone is familiar with proper terminology, and that can easily cause a misunderstanding.

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