Jcrow Posted December 9, 2004 Report Posted December 9, 2004 I just noticed that if i'm in park (happens in all gears) and I press the brake pedal - the idle will slightly rev up. Does anyone elses do this? its a 3.1 Quote
ShockTherapy Posted December 9, 2004 Report Posted December 9, 2004 the power assist is draining power from your system, making the alternator kick in and up the revs by 100 or so, you can really see the effect at night, try it with the headlights on. Quote
WhiteOut Posted December 9, 2004 Report Posted December 9, 2004 the power assist is draining power from your system, making the alternator kick in and up the revs by 100 or so, you can really see the effect at night, try it with the headlights on. Not that I have any better explanation for whats going on, but that doesn't make any sense at all...power brake assist is by intake vacuum not electricity. Quote
digitaloutsider Posted December 9, 2004 Report Posted December 9, 2004 Mine does the same thing. I actually think it's the brake lights themselves. Quote
95 3-4 Posted December 10, 2004 Report Posted December 10, 2004 Its just the use of the vacuum that does it, pump them real fast some cars will stall Old cars used vacuum wipers, under WOT when there is no vacuum the wipers stop, close throttle blade and all kinds of vacuum and they spin real fast, also had vacuum clutches Shoebox Chevies had a vacuum ashtray as a dealer installed option, would vacuum the smoke into the engine and the ashes into a mason jar Quote
digitaloutsider Posted December 10, 2004 Report Posted December 10, 2004 Shoebox Chevies had a vacuum ashtray as a dealer installed option, would vacuum the smoke into the engine and the ashes into a mason jar That's awesome! Quote
Regal_GS_1989 Posted December 10, 2004 Report Posted December 10, 2004 I got a 97 Lumina At home that does the exact opposite thing. when you step on the brakes, the idle drops. doesn't do it every time you step on the brakes, but it does it often. Also, if you put on the rear defroster, or put the car into reverse, it will do this sometimes, To the point to where the car feels like it is going to stall, but never does. BTW, it has been doing that since my parents bought the car in 2000. Still got the oringinal altenator in it though. Quote
Jcrow Posted December 10, 2004 Author Report Posted December 10, 2004 Damn! I was hoping to find the cause of my off-idle stumble Quote
phantomshado Posted December 11, 2004 Report Posted December 11, 2004 I'd check all of your vac lines, I'm thinking that there is a leak in there somewhere. Quote
Jcrow Posted December 11, 2004 Author Report Posted December 11, 2004 I think so too, but it dosen't do it all the time. If I spray some carb spray around the throttle body, egr, and "4 tube vacuum thingy", the rpm goes up slightly. The problem is I can't tell which one it is. You spray it once and it wont do it again. Quote
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