Jump to content
CaddyInfo Cadillac Forum

Recommended Posts

I have a 94 Seville STS and it won't start. When I do get it to start it shuts off after 30 seconds and won't start again. After about 4 or 5 hours it will start up again and shut off. I have the code p080 - Fuel System Rich and also a clicking noise under the hood I believe is coming from the ISC Motor. I've tried getting it out of flood mode...... 1. Key off Foot to the floor 2. Key on and when it starts remove foot immediately. How can I get it started, what needs to be replaced? I'm being told maybe spark plugs and wires, a ISC motor or maybe a faulty FPR.

Link to comment
Share on other sites


I have a 94 Seville STS and it won't start. When I do get it to start it shuts off after 30 seconds and won't start again. After about 4 or 5 hours it will start up again and shut off. I have the code p080 - Fuel System Rich and also a clicking noise under the hood I believe is coming from the ISC Motor. I've tried getting it out of flood mode...... 1. Key off Foot to the floor 2. Key on and when it starts remove foot immediately. How can I get it started, what needs to be replaced? I'm being told maybe spark plugs and wires, a ISC motor or maybe a faulty FPR.

Car won't start is a vague statement

Is is cranking, not cranking, clicking, not clicking when you turn the key? It sounds to me like its cranking but wont start

A rich fuel system could be related to a bad FPR, you need to check that, I believe your FPR is located inside the intake. Do not start the car with the intake cover off.

The ISC should not be causing the starting problem, but it sounds like it needs cleaning and adjusting

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

Link to comment
Share on other sites

So when it DOES start for those 30 seconds... does it run normally?

Or is it really rough with stinky exhaust?

{edit:

"When I do get it to start it shuts off after 30 seconds"

"It's cranking but not starting"

Which one?!

}

Got a buddy with a fuel pressure gauge?

At least that'll let you know if the FPR is at fault.

Edited by Dr.Fiero
Link to comment
Share on other sites

okay it starts about every five hours but only for 30 seconds then shuts off. and it wont start afterwards for about another five hours all it does is cranks but not start. I've removed the manifold cover now what do i do?

Link to comment
Share on other sites

do you see or smell strong gas fumes?

turn the key on and see if you see fuel leaking, but dont start it

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

Link to comment
Share on other sites

you need to see what your fuel pressure is through your fuel rail, it should be 40 to 50 psi and hold steady for your 1995 and earlier northstar.

This test should be done with the key on and engine off. Then start your engine and watch your fuel pressure, it should be lower by 3 to 10 psi.

Edited by heitzman
Link to comment
Share on other sites

The fuel rail should be an aluminum color and should set on top of the intake and connected to your injectors with a shrader valve at the end of it. The fuel rail is a U shape.

Link to comment
Share on other sites

Yes, that is your FPR. I would put new gaskets on and put it back together and see what your fuel pressure is. Can you hear your fuel pump running when you turn the key to the on position?

You might also do new O-rings on the injectors.

Link to comment
Share on other sites

I don't see a vacuum line I believe there isn't one on mine because the FPR is located inside the intake right under the cover and I don't see any leaks anywhere else.

Your year does not have a vacuum hose, like the later years

On your year, its IN the intake and vacuum directly affects the FPR, if you see any fuel at the FPR port its bad, it looks WET to me, but maybe thats oil?

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

Link to comment
Share on other sites

If you look at the picture alot of gas did come out of the part where i labeled leak and maybe a little by the FPR. So if I replace that it should start right? One more question that wasn't answered, if I turn the key to the on position, shouldn't gas be coming from one of those two spots I labeled or shouldn't I be getting at least some fuel to the fuel rail?

Link to comment
Share on other sites

Gas should be supplied to the fuel rail, but there should be no gas leaking externally.

The ISC motor should hold the throttle plate open a bit when the key is turned on. If it does not, the engine is being choked and will not start or run. Try holding you foot on the accelerator just enough to crack the throttle plate and see if it starts.

Link to comment
Share on other sites

I am sorry, I can't help you with this year. Someone will stop by that is familiar with this year and this set up, its very different than the 96 forward that I am familiar with.

If you can wait a day, I would wait a day to see what our members who are familiar with this intake setup say

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

Link to comment
Share on other sites

I replaced the Fuel Pressure Regulator and the car started. But the P080 code will not go away. Online it says

P080 (E080) ....................................................... Fuel System Rich. But according to ALLDATA I need to perform a TP Sensor/Idle learn procedure I've done that but the code won't go away. Should I replace the ISC Motor?

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...