YearOfTheGus

iTrader: (2)

My car was running rough at cruising speed. Felt like a thudding or knocking under light throttle, but went away when I gave it more gas. Once I got home I parked the car and checked the tranny fluid thinking it may be low, turned out to be fine. Then I noticed a groaning noise and traced it to either behind or under the backseat. It seemed to happen every 5 seconds or so, and continued after I turned the car completely off (key was out). I took the gas cap off after and it seemed to stop, not sure if that's a coincidence. I planned on getting a video of the sound but it only did it once (very faint) when restarting the car.

So, I'm guessing this is the fuel pump?

Matt93SE

iTrader: (44)

Could be the fuel pump.. is it a mechanical sound, or just an air escaping sound?

You could also have a leak in the filler tube vent hose.. I don't know if it would cause that noise, but it's in the same general area and is *usually* bad on a 20 year old car if you haven't replaced it.

YearOfTheGus

iTrader: (2)

Sounded like it was mechanical. Are you referring to the hose that's used to fill the tank, or is the vent hose something else? The former was replaced by my uncle a couple of years ago.

Matt93SE

iTrader: (44)

There's actually two hoses there. There's the larger (1.5" or so) fill tube, and then a smaller 5/8" vent hose. It's the smaller vent hose that usually tears.

YearOfTheGus

iTrader: (2)

Figured I'd ask here instead of starting a new thread.

http://www.courtesyparts.com/kb_sear....php?keywords=[14010A]+\(j30&cPath=1610_1611_1612_1623

Why does it list two gaskets for the VG30E? One for 1989-1992 and another for 1993-1994, the older one being about a 1/3 of the price.

chrome91

iTrader: (1)

the link doesnt come to anything specific on the site lol

YearOfTheGus

iTrader: (2)

ah sorry

http://www.courtesyparts.com/14010a-...611_1612_1623&

and

http://www.courtesyparts.com/14010a-...611_1612_1623&

YearOfTheGus

iTrader: (2)

Also, I'm seeing two rear motor mounts listed on RockAuto.com. rear right (part#8602) and rear left (part#8603). Which is the one almost directly behind the front mount?

DennisMik

iTrader: (2)

The groaning noise could be the gas tank equalizing pressure. My 94 and 97 would "wheeze" after parking it and when I opened the gas cap slowly, I could hear air hissing as the vacuum that builds up was equalized.

YearOfTheGus

iTrader: (2)

Managed to get a video of the sound.

http://www.youtube.com/watch?v=txG8nmYVmqY

EDIT: I can upload a video of the sound happening with the car off if needed.

ve30max

iTrader: (2)

I am willing to bet money on the pump. Tear it apart and get a better look.

YearOfTheGus

iTrader: (2)

Went ahead and ohmed out the injectors just to get an idea if the pump is the main cause of my problems.

Cylinder 1: 10.9 ohms
Cylinder 2: Will just check when I'm replacing the others
Cylinder 3: 8.9 ohms (only a year old, Bosch brand)
Cylinder 4: 148 ohms
Cylinder 5: 48 ohms
Cylinder 6: 8 ohms


I'm guessing the ones at 8-9 ohms are fine, and only lower than they should
be due to the car not being warmed up?

Any ideas on those manifold gaskets I posted links to?

gfnk357

I just checked my injectors last weekend and was pretty sure #2 was out. BenStoked posted that there is a subharness that lets you check cylinder 2 without pulling the intake. The subharness is on the drivers side of the engine, you'll need to unhook the plastic intake pipe and rotate it out of the way to get to the subharness but it's pretty easy to check and then you can know how many injectors you need going into the job.

YearOfTheGus

iTrader: (2)

I was just going to replace the remaining 5 stock injectors. I didn't check #2 because I didn't feel like moving my intake piping.

Hectic

iTrader: (20)

Sounds kind of like the sound my pump makes for an extended period once or twice a year. Usually happens when the car is off. Although it doesn't happen in quick bursts like yours, it lasts for about 5 seconds and is pretty loud. Just swap the pump.

gfnk357

Good plan, I should probably do that on mine, I just don't have the cash for 6 new injectors right now.