surfjimbo

Hello, I have a strange noise issue. This noise has been with my 1996 Tacoma 6cyl 3.4L engine since I?ve had it at 65K miles?I?m just about to hit $140K and runs great. I keep up on the maintenance with the truck very well (at least I think I do). This noise has baffled me from day one. It only presents itself when I?m driving up to the mountains in higher elevations (I live in Southern, CA). It sounds like a ?wheezing pig? (guess that?s the best way to describe it). The wheezing sound is coming from a black box that is located in the engine compartment, on the driver?s side, from the "cylinder shape" closest to the Master Cylinder. The wheezing sound will continue even after I turn the truck off. It?s pretty loud too, sort of embarrassing almost. The sound will continue for about 10 minutes slowly getting better. Any ideas? Any help would greatly appreciated! Thank you

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habanero

That's the fuel vapor recovery thingy.....seems there's a valve of some sort that likes to go bad on it....not that that is what's wrong with yours....I'm NOT a mechanic or even close.
Mine was doing it for awhile, but has stopped for some reason, nothing that I did.

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My rides:
'96 4Runner SR5 4x4, manual. Deckplate, ISR, extended rear diff breather mods, flipped receiver hitch, power antenna switch, Garage door opener switch in dash, Kill switch somewhere in there, Thule playpen, system 1.2 installed without any swear words even when my kid walked off with my tools........

Bigblock

Not to sure on this one,have you ever replaced the fuel cap?Any vaccuum lines missing,plugged,kinked,leaking?Thats the evap canister BTW.Next time try screwing the cap out a few turns to releive pressure and see if it quits.Its a cheap place to start.May not be the cap though.

surfjimbo

I changed the fuel cap when I first got the truck, and I just replaced the fuel filter last weekend, I think it was the original one. Maybe that might help. I'll try the fuel cap idea...if that at least helps stop the noise. I checked all the hoses and they are all good. I'm going up to the mountains tomorrow so i'll get a chance to see if the new fuel filter helps. If not, releasing the fuel cap to stop the emabarrasing noise is a good idea. My truck does not deserve such humiliation!!!

surfjimbo

Changed out the fuel cap, it did not help the noise when I was in the mountains this weekend. It was not as bad though as it has been in the past and when I stopped the truck, the noise stopped with it. Any more ideas?

ducaria

My truck does the exact same thing just not as loud. Dont know what it is.

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MTL_4runner

Sounds like you either have a leaking vacuum/EVAP hose or a purge valve that isn't opening correctly.

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- Jamie

1996 4Runner SR5 4X4 Auto

Deckplate Mod, Hayden Tranny Cooler, Amsoil Air Filter, OME 881/906 N86C/N91SC Lift

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.....and I am AMERICAN!

surfjimbo

At least I know I'm not going crazy and am not the only one who has this annoying pig squeeling in my engine. I will check all the vac lines, Is it possible and fairly easy to replace a purge valve? i'm not even sure how to get to it. I'll have to look at the chiltons for that one. Good ideas of where to start though...thanks

rimpainter.com

It's a known issue that's covered (info only) by a TSB. It doesn't hurt a thing, it simply makes an annoying noise. There is a $20 fix from the dealer and it goes between the EVAP canister and the actual line (which goes to the fuel tank and relieves pressure due to temperature).

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MTL_4runner

Christian, is that the same as the EVAP "buzzing" fix?

__________________
- Jamie

1996 4Runner SR5 4X4 Auto

Deckplate Mod, Hayden Tranny Cooler, Amsoil Air Filter, OME 881/906 N86C/N91SC Lift

Best OBD II scan tool I have used!.

.....and I am AMERICAN!

midiwall

Yeup.

Like someone else said, loosening the gas cap will stop the noise until pressure in the tank builds up again (from ambient heat). Mine's done it since it was new, I only learned about the gas cap trick a couple of years ago.

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~ Mark
'96 4Runner Limited S/C MI - 370cc injectors, Air! horns, Airaid MIT, ATS A-arms, 285/75/R16 BFG MTs, Bored TB, Brembo slotted, Cobra 75 WXST, Deckplate, Downey headers, Hayden cooler, IPT valve body, Level 10 torque convertor, Meanstreak exhaust, OME/OME rears, On-board PC (XM, Nav, WiFi, etc), Port 'n Polish, Remote Start, SAW fronts, Hilux console, SMT-5, Stubb's sliders, Supra MAF, TJM-17, 2.0" pulley, Viair 450c, Walbro 190, Weasy2k cams

MTL_4runner

I've never heard it described as a "wheezing pig" so that threw me off a bit.
Mine's been doing that since new, but it doesn't bother me a bit.....too lazy to fix I guess.


Here's the info if surfjimbo is so inclined:
http://yotatech.com/showthread.php?t=45575

__________________
- Jamie

1996 4Runner SR5 4X4 Auto

Deckplate Mod, Hayden Tranny Cooler, Amsoil Air Filter, OME 881/906 N86C/N91SC Lift

Best OBD II scan tool I have used!.

.....and I am AMERICAN!