Back again for help.....rough idle. - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-21-2006, 01:12 AM   #21
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Got the tee from the dealer...asked about the bulk vacuum hose too...had him give me a sample of each size to test for fit.....think i've got it narrowed to the right size...going back tomorrow to pick up some vacuum hose. Do I need to take off the airbox to get to the ones by the vaccum canister thingy? and while i've got that off i'm thinking i may as well tackle the TB cleaning...got a new gasket for that....just hear that bracket can be a PITA. Here'* a pic of the connector for reference:

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Old 07-21-2006, 05:07 AM   #22
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zeroburnz

Thanks for posting the part # for that vacuum T.
That is the first rubber part that I have seen sold separate from a hose assembly.
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Old 07-21-2006, 03:35 PM   #23
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Default Any other ideas guys?

Okay just talking a few guys at work here.....is it possible that the upper intake manifold gasket is leaking from the inside without any outside indications? I have never lost any coolant nor do I have any leaks. Seems that most failures in here mention the coolant loss. Anyway my other question is if this were happening would it cause a misfire on a single cylinder? They recommended I take a propane torch and with the flame off move it around near where the gasket seals the upper and see if the idle smooths out. In all reality I don't know what else the problem would point too......i've been to the dealer already and they were no help at all....wanted me to sell them my car nonetheless....appreciate your ideas guys...keep'em coming.
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Old 07-21-2006, 05:10 PM   #24
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Quote:
For the straight connectors, you can get a 1 foot length of each of 7/32" and 9/32" vacuum hoses and cut to length to replace all the straight ones.

Like I said, replace all the straight connectors while you are at it, including those under you airbox at the vacuum cannister. For the "T" connector, call or go to your local Pontiac or GM dealer. I paid about $3.20 for mine. I think somebody said they got one at their local AutoZone or Advance, but the ones near me didn't have them.

Replacing the cracked vacuum connectors on mine completely solved my mis-fire problems.
As mentioned, the 7/32 and 9/32 sizes are what you need, about a foot of each.

Also, have you replaced all the vacuum connector pieces yet? If not, do that and see what you get before moving too far forward, IMO.

And yes, you have to remove the airbox and move the PCM to get to the evap cannister.
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Old 07-24-2006, 12:05 PM   #25
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Hey guys. Replaced all the vacuum connections down by the evap. canister and some others that looked like they needed replacing. Have noticed that my rpms at idle have smoothed out a little and no more jerking when the transmission shifts. I am however still getting the misfire code on cylinder 3. Other suggestions?
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Old 07-24-2006, 12:12 PM   #26
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I know you put in new/different coils, but have you tried swapping those around to ensure that you didn't get one bad coil? It wouldn't be the first time that has happened.
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Old 07-24-2006, 04:55 PM   #27
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Propane?
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Old 07-25-2006, 11:14 AM   #28
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Lash - Yup, I've switched the coils around since putting on brand new ones. No change.

Ted- Gonna go get some propane after work and check for leaks
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Old 07-25-2006, 11:26 AM   #29
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OK, so, I'm going to sugest a couple things to check again, even though you've recently replaced some of these items.

- Pull Plug #3 and see what you can see. Moisture? White? Oily? Wet? Cracked ceramic?

- Replace plug wire #3 or exchange with another wire of similar length (be extra careful not to mix up!). Sometimes even a new set of wires can have a bad one in it.
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Old 07-26-2006, 11:06 AM   #30
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Ill take a look at that plug and wire later tonight. Also, I still smell fuel from the vac lines going into the FPR. Thoughts on doing a fuel pressure test? Just trying to narrow it down further since its only misfiring on one cylinder....unless a leak could be throwing it off.
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