white4d96 Posted June 28, 2011 Report Share Posted June 28, 2011 ...okay, not really. But it sounds like it does Thing is, only does it for like 3 seconds on startup, randomly. Then it'll surge a bit (like to 1200, nothing massive) for a minute then drop. Vac leak? Quote Link to comment Share on other sites More sharing options...
Addicted to eaton Posted June 28, 2011 Report Share Posted June 28, 2011 Check for vac at the map. Quote Link to comment Share on other sites More sharing options...
94 olds vert Posted June 28, 2011 Report Share Posted June 28, 2011 My car sounded like it had a cam. The rubber hose around the brake booster was shot. I replaced that and I went away. Quote Link to comment Share on other sites More sharing options...
white4d96 Posted June 28, 2011 Author Report Share Posted June 28, 2011 You replaced it and you went away? :lol: I do need to replace my rear breather tube? That plastic tube in the intake tube that IIRC goes to rear valve cover, mine's held together by electrical tape I'll replace the brake booster hose too, as I have next to no brake assist as well (which I actually kinda like ) Quote Link to comment Share on other sites More sharing options...
joecutlass Posted June 28, 2011 Report Share Posted June 28, 2011 I had the same issue and it turned out being the tps was bad. Quote Link to comment Share on other sites More sharing options...
94 olds vert Posted June 28, 2011 Report Share Posted June 28, 2011 Yeah, I was mad my car didn't sound awesome anymore and I went away. Your problem could be a vacuum leak. Like you said if your breather tube patched by electrical tape. Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted June 28, 2011 Report Share Posted June 28, 2011 yes, fix breather tube, PCV problems can cause all kinds of weird idle things to happen. Quote Link to comment Share on other sites More sharing options...
Garrett Powered Posted June 29, 2011 Report Share Posted June 29, 2011 I had the same thing. turns out the problem was the engine had a built cam in it. lol Quote Link to comment Share on other sites More sharing options...
white4d96 Posted June 30, 2011 Author Report Share Posted June 30, 2011 I had the same thing. turns out the problem was the engine had a built cam in it. lol If only that was it. Speaking of PCV issues, the elbow on my PCV going to the vacuum hose keeps collapsing. Replaced both PCV and elbow still does it. Quote Link to comment Share on other sites More sharing options...
dodgethis Posted June 30, 2011 Report Share Posted June 30, 2011 If only that was it. Speaking of PCV issues, the elbow on my PCV going to the vacuum hose keeps collapsing. Replaced both PCV and elbow still does it. Are you saying that when you look at the pcv gromet thats the L shape that hooks to the plastic line that it expands and contracts? I was going to say i had the same situation with me when i did a tune up and ended up was given the wrong gromet. I think it was a dang spark plug boot that was an L shape. That thing didn't do the job whatsover. I was going to mention, try to head down to the autozone, or some auto parts store that sells, the "Help PCV fix" or something like that written on the box. It comes with the rubber gromet and and the plastic black line thats connected to it. I just took a knife and cut between the line and gromet, and used the gromet to fix the problem. Quote Link to comment Share on other sites More sharing options...
dodgethis Posted June 30, 2011 Report Share Posted June 30, 2011 Are you saying that when you look at the pcv gromet thats the L shape that hooks to the plastic line that it expands and contracts? I was going to say i had the same situation with me when i did a tune up and ended up was given the wrong gromet. I think it was a dang spark plug boot that was an L shape. That thing didn't do the job whatsover. I was going to mention, try to head down to the autozone, or some auto parts store that sells, the "Help PCV fix" or something like that written on the box. It comes with the rubber gromet and and the plastic black line thats connected to it. I just took a knife and cut between the line and gromet, and used the gromet to fix the problem. One other thing when my pos gromet would pop off the plastic line, and lost vaccum, man my 3100 would knock, stumble, sound like complete shit, until i fixed it. Quote Link to comment Share on other sites More sharing options...
white4d96 Posted July 6, 2011 Author Report Share Posted July 6, 2011 Okay, Doing some messing around and found something interesting: If I pump my brakes with the car running, it will "lope" like it does on initial startup. So I'm thinking booster-ish area. I have heard the boosters are failure prone, but what else should I check first? Hose, check valve, ??? Quote Link to comment Share on other sites More sharing options...
spiderw31 Posted July 6, 2011 Report Share Posted July 6, 2011 Okay, Doing some messing around and found something interesting: If I pump my brakes with the car running, it will "lope" like it does on initial startup. So I'm thinking booster-ish area. I have heard the boosters are failure prone, but what else should I check first? Hose, check valve, ??? Disconnect the brake booster line from the plenum, and cap it off. You'll know for sure if the booster / check valve is causing the issue that way. Of course you'll have pretty terrible brakes, so don't drive it that way! Quote Link to comment Share on other sites More sharing options...
white4d96 Posted July 8, 2011 Author Report Share Posted July 8, 2011 Pulled booster hose and plugged it and she started up perfect, no issues. The check valve should just pop off right? Quote Link to comment Share on other sites More sharing options...
spiderw31 Posted July 8, 2011 Report Share Posted July 8, 2011 Yes, I believe it just pops off. If pulling the vac line off at the plenum did resolve the issue, I'm gonna say your booster probably has a slow leak. I'd also guess that if you pressed the brake pedal without starting your car after it has sat for a day results in a rock hard pedal. Quote Link to comment Share on other sites More sharing options...
white4d96 Posted July 8, 2011 Author Report Share Posted July 8, 2011 Surprisingly it's not that hard. Just for shits I backed down and up the drive with the hose plugged and it was firmer than normal, but still controllable. An emergency stop would be hairy, but that's about it. But yes, if I leave the car sit the pedal firms up. As will it if I pump the pedal like 3 times with engine off. If the booster is leaking I will just get a new 88-93 one (to clear clutch MC when I 282 it) Quote Link to comment Share on other sites More sharing options...
spiderw31 Posted July 8, 2011 Report Share Posted July 8, 2011 But yes, if I leave the car sit the pedal firms up. As will it if I pump the pedal like 3 times with engine off. Yeah, that's probably a leaky booster then. Pumping the pedal with the car off depletes the vacuum "reservoir", but it should not deplete on its own that quickly. So what happens then is since the booster has no vacuum when you first start the car, it basically is a giant vacuum leak until it is replenished. Quote Link to comment Share on other sites More sharing options...
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