its moaning!

dotcom · 01-16-2009, 05:38 PM

so my 91 ex cab moans loudly whenever i start it. it lasts for 30 to 45 seconds and then goes away. it seems to be coming from the back of the cab/truck and i can not hear it outside the truck. but in the cab it is loud, any ideas? anyone else have this issue?

thanks
sean

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space-junk · 01-16-2009, 06:20 PM

...

soooo many jokes that could be made...

auto or man? and is this noise at idle or driving??

Jay351 · 01-16-2009, 06:21 PM

I guess you could say you "turn your truck on"

DC.Woods · 01-16-2009, 06:30 PM

Dirty minds... oh crap thats what I was thinking

toyota4x4907 · 01-16-2009, 06:42 PM

Do you have like a sub or amp in the rear of the cab?

dotcom · 01-16-2009, 08:36 PM

auto 3.0 has a pos stereo with only speakers in the front. only thing i have done is a new fuel pump lately, could that be making the noise? it sounds like there is a ghost in the back of the truck. only at idle on startup before you move.

dntsdad · 01-16-2009, 08:43 PM

fuel pump vibrating on something?

Lots of jokes to be made here!!

Kiroshu · 01-16-2009, 08:52 PM

Sounds like you def left somethin loose relating to your pump. Is your exhaust loose?

scope103 · 01-17-2009, 01:06 PM

Any chance the moaning is coming from the rear of the engine on the passenger side? (Lift the hood, use a paper-towel tube as a stethoscope). If so, I would guess it's the PAIR valve. More than one on this list has reported that one or more of the four screws holding it together loosened up, which will cause a) moaning b) that is present for 30sec-3min after starting.

If that's your problem, it isn't tooooo hard to fix, at least if you have small hands and a very short phillips screw driver.

abecedarian · 01-17-2009, 06:18 PM

The PAIR valve could be a culprit- it's basically a pair of reed valves and it's possible that they are oscillating causing a moaning like noise.
But being you can't hear it outside the truck it's likely something in the fuel system- the pump or something connected, oscillating. Maybe even the fuel filter has some air in it and it's taking a bit to get the air out. Could even be the fuel pressure regulator.
If it were the 22re and a little older, I'd suspect the pulsation dampener but I don't believe the V6 has one.

space-junk · 01-18-2009, 12:36 AM

pulsation dampner sounds dirty...

01-16-2009, 06:21 PM	#3 (permalink)
Jay351 Contributing Member Join Date: Feb 2007 Location: maple ridge, British Columbia, Canada Posts: 8,647	I guess you could say you "turn your truck on" __________________ 91 Pickup - xcab - 5sp - 3.0 - SR5 - 4x4 - 250k \|2.25" catback w/ magnaflow cat + glasspack \| Weasy2k cams \| Aisin manual hubs \| Diff breather mod\| Marlin HD clutch \|3" BL \| es3000's \|2" AAL \|1.5" bj spacers \| ISR \| Alpine headunit \| 4" Infinity fronts/5" rears \| 4.88's \|Rear lockright \| 33x12.50" BFG M/T on 15x8" steelies \|Hella 500's \|4" reverse lights\| Grant GT \|idler arm brace\|hella E-codes\| Marlin armor \|SS IFS brace \| %100 Amsoil synthetic http://www.cardomain.com/ride/2572486

01-16-2009, 06:42 PM	#5 (permalink)
toyota4x4907 Registered User Join Date: Sep 2008 Location: Fairbanks, Alaska Posts: 2,336	Do you have like a sub or amp in the rear of the cab? __________________ '95 4runner\|22re\|5spd\|130K miles\|ISR\| 2" BL\| 31x10.5 \| CompuStar Auto-start\| two 170mm LightForce\|anti-sway bars removed f/r\|Warn manual hubs\|ADD bypassed\|Diff breather extensions\|XLPerformance muffler '88 4runner\|22re\|5spd\|206K miles\|Sold '93 single cab\|22re\|5spd\|150K miles\|Sold\| Pro IFS

01-16-2009, 08:36 PM	#6 (permalink)
dotcom Registered User Join Date: Nov 2008 Posts: 40	auto 3.0 has a pos stereo with only speakers in the front. only thing i have done is a new fuel pump lately, could that be making the noise? it sounds like there is a ghost in the back of the truck. only at idle on startup before you move. __________________ The Mortgage Guy! 91 Toyota ex cab 4x4 silver with 5.5in lift, 33's, rear locker, HAM radio, GPS, CB radio, 9000lb winch www.griffithlending.com or 303-459-2586 I do everything the voices in my wifes head tell me to do.

01-16-2009, 08:52 PM	#8 (permalink)
Kiroshu Registered User Join Date: Oct 2007 Location: wade, NC Posts: 1,342	Sounds like you def left somethin loose relating to your pump. Is your exhaust loose? __________________ My current: 1986 Toyota 4runner SR5 EFI 4cyl 2.4L 22RE 5-Speed 242,000 Miles 95% Stock __________________ (Still working on restoring her) My old: 1988 Toyota 4runner SR5 EFI V6 3.0L 3VZ-E 5-Speed 302,000 Miles All stock (sold)______________ (Was my fastest truck i miss her...) My old: 1989 Toyota 4runner Non-SR5 EFI 4cyl 2.4L 22RE Automatic 231,000 Miles (sold)______________ (was my quietest and slowest yota.)

01-17-2009, 01:06 PM	#9 (permalink)
scope103 Registered User Join Date: Sep 2007 Location: San Francisco East Bay Posts: 195	Any chance the moaning is coming from the rear of the engine on the passenger side? (Lift the hood, use a paper-towel tube as a stethoscope). If so, I would guess it's the PAIR valve. More than one on this list has reported that one or more of the four screws holding it together loosened up, which will cause a) moaning b) that is present for 30sec-3min after starting. If that's your problem, it isn't tooooo hard to fix, at least if you have small hands and a very short phillips screw driver. __________________ 1994 6cyl 4wd XCab -- all stock

01-16-2009, 06:30 PM	#4 (permalink)
DC.Woods Contributing Member Join Date: Nov 2008 Location: Michigan Posts: 191	Dirty minds... oh crap thats what I was thinking

01-16-2009, 08:43 PM	#7 (permalink)
dntsdad Registered User Join Date: Jan 2009 Location: Fresno, Ca. Posts: 295	fuel pump vibrating on something? Lots of jokes to be made here!!

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