92 oldsmobile 88 stalling when cold fine when warmed up - Page 4 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Oldsmobile When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 03-07-2006, 05:17 PM   #31
Senior Member
True Car Nut
 
Join Date: Mar 2004
Location: Ames, Iowa
Posts: 3,066
Thanks: 0
Thanked 1 Time in 1 Post
bill buttermore is on a distinguished road
Default

Quote:
Originally Posted by 92olds88royale
fuel pressure tested good. all grounds are good.
OK, but did you check the Fuel Pressure Regulator vacuum hose right after you shut the car off?
bill buttermore is offline   Reply With Quote
Old 03-07-2006, 07:53 PM   #32
Senior Member
True Car Nut
 
Join Date: Mar 2004
Location: Ames, Iowa
Posts: 3,066
Thanks: 0
Thanked 1 Time in 1 Post
bill buttermore is on a distinguished road
Default

If your car is still exhibiting a significant change in idle speed or quality when you remove the oil filler cap, you almost certainly have a vacuum leak. That is why I keep asking you to look at vacuum related components, and suggest the propane test for leaking gaskets.

You may have other problems, too, but you should NOT be able to change the idle quality by opening the oil filler. That is not a normal condition.

Still, there may well be something I am overlooking here. I'll see if I can find some better qualified help for you.
bill buttermore is offline   Reply With Quote
Old 03-07-2006, 08:42 PM   #33
Senior Member
True Car Nut
 
Join Date: Mar 2004
Location: Ames, Iowa
Posts: 3,066
Thanks: 0
Thanked 1 Time in 1 Post
bill buttermore is on a distinguished road
Default

OK, got some help from a smarter mechanic.

Is your car losing oil between changes? Do you notice any smoke out the tailpipe? The reason for asking is that worn intake valve stem guides and seals can create a connection between the intake manifold and the crankcase that might explain or contribute to the idle problem. It could throw off the vacuum/pressure balance that the PCV valve is trying to maintain at idle.

But this kind of wear would not normally be expected at 83K miles. Did you buy this car new? Do you know the oil change history, or of any overheating incidents?
bill buttermore is offline   Reply With Quote
Old 03-07-2006, 11:29 PM   #34
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Jan 2006
Location: westchester county ny (cortlandt manor)
Posts: 136
Thanks: 0
Thanked 0 Times in 0 Posts
92olds88royale is on a distinguished road
Default

i baught the car off my grandmother the car was babied i baught the car with 56k miles tune up once a year oil chance every 3k miles no smoke out the tail pipe only when cold but thats like condensation. i checked the vaccum hoses coming from the fuel pressure regulator no fuel in them. i really have no idea and neither do any mechanics im gunna do the propane test tomarow.
92olds88royale is offline   Reply With Quote
Old 03-08-2006, 02:20 AM   #35
Senior Member
True Car Nut
 
Join Date: Mar 2004
Location: Ames, Iowa
Posts: 3,066
Thanks: 0
Thanked 1 Time in 1 Post
bill buttermore is on a distinguished road
Default

Here is what better mechanics have to say about your problem:

Quote:
Originally Posted by willwren
I'd love to see him leave the oil cap off and install a breather in it'* place and see if the car would re-learn idle. If it DID, I'd expect a compression test would be in order. Blow-by CAN be learned by the PCM. As can a Bad PCV valve/breather combination or swap.

Can we get a compression check? Not only dry, but BOTH wet and dry? ...
Quote:
Originally Posted by willwren
.... If the wet and dry compression checks read the same, look at the PCV or LIM seals.

If the dry is worse than the wet, it'* the rings (not likely).

If the wet and dry are still the same after the PCV and LIM seals are ruled out, look at the valve stem seals.

The wet improving compression will only point to rings/blowby.
Quote:
Originally Posted by ssei1995
.... Try Will'* recommendation and let us know the results. You either have a damaged intake manifold, or blow-by from the rings or valve guides, or a bad PCV valve or broken PCV "O" ring seal.
If it turns out that you have a leaking lower intake manifold, the propane test will only reveal a breach from an intake port to the atmosphere. If the breach is between an intake port and the underside of the manifold (crankcase), the propane test will NOT reveal this. The lower intake manifold gasket commonly fails on these cars, but usually results in coolant in the cylinders and oil. If you are still running your original upper intake manifold, it is time to change it and your lower intake gaskets anyway. See this info: http://www.bonnevilleclub.com/forum/...e=article&k=38
bill buttermore is offline   Reply With Quote
Old 03-08-2006, 12:52 PM   #36
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Jan 2006
Location: westchester county ny (cortlandt manor)
Posts: 136
Thanks: 0
Thanked 0 Times in 0 Posts
92olds88royale is on a distinguished road
Default

what are lim seals lower intake manifold? the propane test showed nothing this morning then i tried it with carb cleaner and nothing.
92olds88royale is offline   Reply With Quote
Old 03-08-2006, 12:56 PM   #37
Senior Member
True Car Nut
 
Join Date: Mar 2004
Location: Ames, Iowa
Posts: 3,066
Thanks: 0
Thanked 1 Time in 1 Post
bill buttermore is on a distinguished road
Default

Yes, sorry about the jargon. LIM= Lower Intake Manifold
bill buttermore is offline   Reply With Quote
Old 03-08-2006, 01:00 PM   #38
Senior Member
True Car Nut
 
Join Date: Mar 2004
Location: Ames, Iowa
Posts: 3,066
Thanks: 0
Thanked 1 Time in 1 Post
bill buttermore is on a distinguished road
Default

Quote:
Originally Posted by 92olds88royale
what are lim seals lower intake manifold? the propane test showed nothing this morning then i tried it with carb cleaner and nothing.
So it would appear the gaskets are not leaking to the atmosphere. Did you go around the throttle body UIM (upper intake manifold) seal too? If you cannot detect any change all around the outsides of the intake seals, then I would do the compression tests dry and wet (wet = with several squirts of oil on top of the piston through the spark plug hole to temporarily seal the rings) like willwren suggests and see what you get.
bill buttermore is offline   Reply With Quote
Old 03-08-2006, 01:05 PM   #39
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Jan 2006
Location: westchester county ny (cortlandt manor)
Posts: 136
Thanks: 0
Thanked 0 Times in 0 Posts
92olds88royale is on a distinguished road
Default

i checked around the throttle body and around the intake manifold , and nothing. But it does sound like air is leaking neer the pcv even though its all sealed up. It might just be the belt though im not sure. i will go out in do a compression test in a few minutes and see what turns up.
92olds88royale is offline   Reply With Quote
Old 03-08-2006, 01:36 PM   #40
Senior Member
True Car Nut
 
Join Date: Oct 2005
Location: Central Florida
Posts: 7,030
Thanks: 0
Thanked 0 Times in 0 Posts
lash is on a distinguished road
Default

You can isolate the sound you are hearing near the PCV valve by using a length of hose. One end placed to your ear and the other near the PCV or other areas until you can tell which is making the sound.
lash is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
92 88 won't restart after sitting. Cold start fine, imediate restart fine chevjerico Oldsmobile 8 05-27-2013 12:07 AM
Stalling after warmed up. 4carb 2000-2005 9 10-04-2009 10:59 AM
stalls & jerks when cold when warmed up idles rough 92olds88royale Oldsmobile 4 02-01-2006 08:09 AM
0-85 vid...with warmed up torque convertor... harofreak00 Your Other Rides: Pics & Videos 35 08-29-2005 09:16 PM
Surge problem with my SSEi only when warmed up. RyanSSEi 1992-1999 2 12-20-2002 11:00 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 10:06 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.