Im stumped, I give up! - Page 4 - 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 01-24-2006, 11:09 PM   #31
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Me and my dad just thought of something that kinda fits all the pieces of the puzzle together. My master cylinder has a leak, you can see it going down the firewall, Since these problems arose its been using more and more fluid. Now correct me if Im wrong, but a bad master cylinder/booster, would cause a bad vacuum leak when brakes are applied. Causing a vehicle to stall. Also it could allow brake fluid to enter vacuum lines which would cause the smoke/ stumbling I've been getting?
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Old 01-24-2006, 11:10 PM   #32
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Oh yeah? I was always under the impression from what I've read on here that the rear one going bad would screw it up, so I should change both I guess huh?
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Old 01-24-2006, 11:15 PM   #33
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So it is some sort of a vacuum leak. I will have to get mine tested I guess. The only thing that confuses me on my issue is why it only does the stalling on low gas.
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Old 01-24-2006, 11:16 PM   #34
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Have you checked you fuel pressure? General area for an L36 is 48-55 Psi

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Old 01-24-2006, 11:18 PM   #35
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I have no way to. I wish I could, I don't understand why it would be low, I replaced everything maybe a year ago tops. Unless it'* the pump I did get it at Autozone...or maybe Advanced, not sure. Could it be the pulsator? Do those come with a new pump? I don't recall if I changed that.
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Old 01-24-2006, 11:21 PM   #36
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So with the problem I listed above, with the master cylinder booster, any chance thats whats throwing the EGR code too?

Oh and for checking fuel pressure, I bought a Shrader Valve pressure guage at advance for $35, figure its always handy to have
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Old 01-24-2006, 11:22 PM   #37
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Quote:
Originally Posted by ShortyzKustomz
Me and my dad just thought of something that kinda fits all the pieces of the puzzle together. My master cylinder has a leak, you can see it going down the firewall, Since these problems arose its been using more and more fluid. Now correct me if Im wrong, but a bad master cylinder/booster, would cause a bad vacuum leak when brakes are applied. Causing a vehicle to stall. Also it could allow brake fluid to enter vacuum lines which would cause the smoke/ stumbling I've been getting?
Not so sure about the brake fluid entering the vac lines...

Is the Master cylinder leaking, as in there is brake fluid at the rear of the master cylinder running down the brake booster?

And ys if the brak booster is bad enough it can cause a sorts of issues...

As a test you could pull the Vac line to the booster and plug it and see if the issues go away... If they do the booster is bad... Be careful tho, there is really good suction there... lol

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Old 01-24-2006, 11:24 PM   #38
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Theres fluid dripping down the firewall, But certainly not as much as this thing has been using. Its going though a big bottle every 2 1/2 weeks. I've seen modulators on trannys go and suck tranny fluid through the vacuum lines, So I figured some o-rings going could cause brake fluid.
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Old 01-24-2006, 11:53 PM   #39
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Quote:
Originally Posted by ShortyzKustomz
Theres fluid dripping down the firewall, But certainly not as much as this thing has been using. Its going though a big bottle every 2 1/2 weeks. I've seen modulators on trannys go and suck tranny fluid through the vacuum lines, So I figured some o-rings going could cause brake fluid.
I always say this... Its so hard when we can't be there to look at it...

On my 91 SSE the master cylinder is good but the booster is shot... Causes some idle issues, but not enough to stall it out yet..

And I have gone through a Modulator on my 95... It was sucking in trans fluid... Man that thing was expensive at the dealer...

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Old 01-30-2006, 02:09 AM   #40
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well i have a 92 se and i have been havin the same problems since my power steering pump has been replaced? ima go get it scanned also and see wat is happening with it
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