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well after searching I havent found anything useful on the PSP sensor.

I have found several other threads that seem to have the exact same idle problem but none have a successful solution

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Are you getting a P0550 code? Even in history

That code is for an open PSP anddefaults the minimum rpm to 800

In drive, 800 equates to a pretty high RPM when you put it into N or P

Pre-1995 - DTC codes OBD1  >>

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

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unfortunately no other codes other than the 0507.

It is idling around 800 to 850 in gear, and in park or neutral right around 1100RPM.

I went to my local dealer today and got the run around . And I couldnt afford the diagnostics charges for now.

Again thanks for all the info

GM FAN FOREVER

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Things that can create a high idle

Vacuum leak, should set lean code, but have you looked?

Is the oring on the IAC motor?

PSP sensor being OPEN, would set code

Manual throttle cable binding

Throttle plate not closing fully

Bad PCM, invoking high idle in error

PCM not able to 'learn' idle

Worn throttle plate shaft

Visually/physically inspect for the following conditions:

  • Throttle body tampering (adjustment screw).
  • Restricted air intake system. Check for a possible collapsed air intake duct, restricted air filter, or foreign objects blocking the air intake system.
  • Throttle body. Check for objects blocking the IAC passage or throttle bore, excessive deposits in the IAC passage and on the pintle, and excessive deposits in the throttle bore and on the throttle plate.
  • Vacuum leaks.

Check for poor terminal contact at the IAC harness connector

Check terminal contact at the PCM connector C1 terminals 8, 9, 10 and 11.

Repair terminal contact if needed

Replace the PCM. Refer to PCM Replacement/Programming

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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ok well this is where I am at. Today I put the car back in the garage and ran the engine while using a straw to try to pinpoint any leaks. I could swear I could hear something toward the power steering pump, near that valve but could not pinpoint anything. So I decided that being the problem didnt start till I did the intake job to pull everything apart and start from scratch. I have everything apart except the fuel lines(I have to pick up my tool) and am praying I didnt crack the intake upon installation. I ordered new intake manifold gasket set and once I pull it off i am going to closely inspect everything again

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Good, let us know how this develops. Maybe the valve was leaking vacuum. Keep in mind that you can buy a new one. Do you need more info on its R&R?

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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When you mention the valve are you talking about the flapper valve on the intake? I cant find any info on that valve and the dealer tells me the intake needs to be replaced.

I am curious on the torque specs.

What are the specs for the bolts on the intake and what are the specs on the stud bolts . Does anyone have a torque spec diagram?

GM FAN FOREVER

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intake is removed, lots of pics.

Now I dont know if this means anything but . The square sensor on the intake(manifold pressure sensor i presume) haad a different partnumber than the 99, sowhen I did the intake I used my old one on the new intake. I did that correct right?

I inspected everything and noticed nothing out of the ordinary, no cracks or anything but I have ordered the gasket set. Maybe the gaskets are bad. I wuld have ordered them before but I could not afford them. TB spacer and TB gasket look fully intact. Butterfly looks fine.

Ialso have to ask. It states to install the TB gasket with petroleum jelly, I assume this is strictly to hold the gasket in place? I did not use anything when I installed the gaskets and they stayed in place.

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GM FAN FOREVER

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Well unfortunately I have to wait till the 12th for my parts to get here.

I ordered the intake manifold gaskets, thermostat, housing gasket. I am hoping for the best but I guess it will sit for now

GM FAN FOREVER

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I just looked through your photos, the mating surfaces are nice and clean. I am sure its just shadows, but the throttle place in those photos does not look fully closed, have a look for me.

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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well thanks for looking. I inspected the throttle plate and there is a shadow at the bottom. other than that it looks like it closes all the way. I am really hoping for the best once all is put back together. It just seems funny the idle thing didnt start happening till I cleaned everything and replaced the intake

GM FAN FOREVER

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well thanks for looking. I inspected the throttle plate and there is a shadow at the bottom. other than that it looks like it closes all the way. I am really hoping for the best once all is put back together. It just seems funny the idle thing didnt start happening till I cleaned everything and replaced the intake

We need to look into that over pressurization valve to see if it can be inspected. Did you old whistling valve set any lean codes?

Did you re-use your old intake gaskets? Did you use the correct tightening sequence and torque spec for the intake bolts?

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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Here is info regarding the over pressurization valve, the number refer to the attached photo

Inspect the intake manifold for the following conditions:

  • Damage to the pressure relief valve mounting bosses (1)
  • Damage, debris or restrictions to the pressure relief valve port (2)
  • Damage to the pressure relief valve components (3)

post-2998-130998667822_thumb.gif

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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Inspect the intake manifold for the following conditions:

  • Damage, gouges or cracks to the intake manifold sealing surfaces and grooves (1)
  • Damage or excessive scoring to the fuel injector bores

Inspect the front of the intake manifold for the following conditions:

  • Damage, debris or restrictions to the intake manifold passage (1)
  • Damage to the plenum duct neck (2)

Inspect the intake manifold for the following conditions:

  • Damage, debris or restrictions to the PCV system hose port (1)
  • Damage, debris or restrictions to the vacuum port (2)

Inspect the intake manifold cylinder head deck for warpage.

    Locate a straight edge across the intake manifold cylinder head deck surface.
  1. Insert a feeler gage between the intake manifold and the straight edge. An intake manifold with warpage in excess of 0.25 mm per 25 mm (0.010 in per 1.00 in) must be replaced.

Repair or replace the intake manifold as necessary.

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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Ok the original intake threw no lean codes, just had a very loud whistle about half the time.

The part I regret was not replacing the intake gaskets. I could not afford them when I did the job. Usually I wouldnt even think twice.

the engine I pulled the replacement intake from ran good except the pulled head bolts(thus the reason why I went that route)I pulled it from a 99 Deville

One thing I do know is that the manifold pressure sensor was diffeent on the 99s intake than mine. I used the one from my original intake.

Physically looking at the replacement intake I see nothing out of the ordinary.

The big question I have is How do you torque the 4 studs? I was worried about that also because it just didnt seem right whenn tightening the studs(when I say studs I mean the 4 studs that the cover are secured through).

Judging by the picture It looks like I can remove the 2 screws and check the internals of the valve. Why I dont remember seeing them I dont know.

Again thanks for all the help

GM FAN FOREVER

Nice, clean, luxury= fine automobile

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Ok the original intake threw no lean codes, just had a very loud whistle about half the time.

The part I regret was not replacing the intake gaskets. I could not afford them when I did the job. Usually I wouldnt even think twice.

the engine I pulled the replacement intake from ran good except the pulled head bolts(thus the reason why I went that route)I pulled it from a 99 Deville

One thing I do know is that the manifold pressure sensor was diffeent on the 99s intake than mine. I used the one from my original intake.

Physically looking at the replacement intake I see nothing out of the ordinary.

The big question I have is How do you torque the 4 studs? I was worried about that also because it just didnt seem right whenn tightening the studs(when I say studs I mean the 4 studs that the cover are secured through).

Judging by the picture It looks like I can remove the 2 screws and check the internals of the valve. Why I dont remember seeing them I dont know.

Again thanks for all the help

The intake gaskets can usually be reused unless they are damaged.

As far as torquing the studs, I believe I used a deep socket when I Timeserted the engine in my STS.

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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The intake manifold bolts get tightened in a cross pattern to 89 INCH pounds, using a deep socket as KHE stated

Throttle body spacer and throttle body attachment bolts are torqued to 106 INCH pounds

I don't see anything on the manifold pressure sensor, what is that?

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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SO do the 4 studs have the same torque spec as the rest of the bolts?

There is a sensor on the intake towards the throttle body. square . Think it is called a manifold pressure sensor. It just pops onto the intake

100_2307-1.jpg

GM FAN FOREVER

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Ok the original intake threw no lean codes, just had a very loud whistle about half the time.

The part I regret was not replacing the intake gaskets. I could not afford them when I did the job. Usually I wouldnt even think twice.

the engine I pulled the replacement intake from ran good except the pulled head bolts(thus the reason why I went that route)I pulled it from a 99 Deville

One thing I do know is that the manifold pressure sensor was diffeent on the 99s intake than mine. I used the one from my original intake.

Physically looking at the replacement intake I see nothing out of the ordinary.

The big question I have is How do you torque the 4 studs? I was worried about that also because it just didnt seem right whenn tightening the studs(when I say studs I mean the 4 studs that the cover are secured through).

Judging by the picture It looks like I can remove the 2 screws and check the internals of the valve. Why I dont remember seeing them I dont know.

Again thanks for all the help

For the heck of it, if the intake is off, I would check the over pressurization valve out to make sure it is OK. I just cant help but think you would get LEAN codes if unmetered air was allowed in to the intake enough to affect the idle

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 intake bolts have the same torque, those 4 just are extended so that you can put the beauty cover on

Make sure you have no leak at that sensor and any orings are in place

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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Here is info regarding the over pressurization valve, the number refer to the attached photo

Inspect the intake manifold for the following conditions:

  • Damage to the pressure relief valve mounting bosses (1)
  • Damage, debris or restrictions to the pressure relief valve port (2)
  • Damage to the pressure relief valve components (3)

Update 7/14.

I put everything back together today and did not have quite enough coolant for topoff. So I reconnected the battery and let the car sit while I went to work. Tonight I topped off the coolant. Started it up and it idled at about 800 once it settled. I didnt drive it, but it still seems high to me. I guess I wont know till tomorrow.

My 96 deville idles at 625-650 after abut 1 minute. I dont know if my seville is supposed to be similair. I really wish it had a digital tach.

I am crossing my fingers because it is very irritating.

I have 2 important questions.

I have looked everywhere on both of my intakes and cannot find that blow by valve in the picture. Am I missing something or are my intakes different?

Does anyone know the exact location of the power steering pressure sensor? I understand if it is on the rack, but where and how to access it? want to make sure I get the right sensor

Update 7/15.

unfortunately problem still exists. It seems to be idling lower than before but still throws the code. When I hookup my scantool it is saying there is throttle being applied at at idle. And that the desired idle is 627RPM but the actual idle is about 950. thatsover 300rpm over the Desired idle. I am very confused

GM FAN FOREVER

Nice, clean, luxury= fine automobile

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I have looked everywhere on both of my intakes and cannot find that blow by valve in the picture. Am I missing something or are my intakes different?

Are you talking about the over pressurization relief valve pictured in post #38? That is the valve on the 2000+ engines and is on the TB side. Yours is a spring loaded flapper door (for lack of a better description) and is on the other end of the engine in the manifold tunnel behind the P/S pump.

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I have looked everywhere on both of my intakes and cannot find that blow by valve in the picture. Am I missing something or are my intakes different?

Are you talking about the over pressurization relief valve pictured in post #38? That is the valve on the 2000+ engines and is on the TB side. Yours is a spring loaded flapper door (for lack of a better description) and is on the other end of the engine in the manifold tunnel behind the P/S pump.

Thank you. I figured something was different.

To update today went terrible. SES light keeps coming on. Asthe engine warms up the idle slowly increases. To at least 300 rpm over normal. I went 40 miles and it is worse now.

I located the PSP sensor and jumpered the plug, no change.

I am curious if it could be the coolant temp sensor, or throttle position sensor, or something like that. But the big thing is that none of this started till I replaced the intake.

worst case scenario I will have to reinstall my original intake ad hope it fixes it. But I have no idea what could be wrong with the intake I have installed.

I really cannot afford the dealer right now but may not have a choice

GM FAN FOREVER

Nice, clean, luxury= fine automobile

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Ok, I think what I did was I went to 97 in the GM SI, and there was no description of the overpressurization valve in the text and I moved forward by year till one showed up that I could post, not thinking that it was different. The photo I posted should have immediately looked different than your 97

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 only thing that this is due to the new intake, checking the P0507 again (that is what you are getting correct?), they said to check for vacuum leaks. I posted this before, but there is not much that can go wrong besides the PSP which you jumped. How are the gaskets/seals between the intake and the throttle body? When this high idle occurs can you turn the engine off and look to see if the throttle plate is closed?

Visually/physically inspect for the following conditions:

  • Throttle body tampering (adjustment screw).
  • Restricted air intake system. Check for a possible collapsed air intake duct, restricted air filter, or foreign objects blocking the air intake system.
  • Throttle body. Check for objects blocking the IAC passage or throttle bore, excessive deposits in the IAC passage and on the pintle, and excessive deposits in the throttle bore and on the throttle plate.
  • Vacuum leaks

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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