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Guest Message by DevFuse
 

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A simple problem


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28 replies to this topic

#1 MachineAgeVictim

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Posted 01 April 2006 - 11:10 PM

I just picked up a '79 4wd wagon :headbang:, when I give it too much throttle it feels like the fuel cuts out, I have to slowly eccelerate

#2 moosens

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Posted 02 April 2006 - 01:03 AM

MAV is back and goin old school.:headbang:

Nice little ride you picked up there.

Check all vacuum hoses for cracks,etc.?

#3 Zefy

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Posted 02 April 2006 - 01:15 AM

that sounds like textbook accelerator pump failure... its a pretty easy fix... however if you're going to replace your accel pump you might aswell rebuild your carb completely...

to test if its the accel pump and not some other problem:

pop off your air can... then hold your choke open with a screwdriver or something... get a light and shine it down into your carb... now with your other hand turn your throttle... first thing you should see is that arm at the very top of your carb on the front move up on a pivot... and you'll see on the other side of the arm a little rubber boot... you should see that get compressed down... under that little rubber boot is your accel pump... it shoots raw gas into the carb so it doesn't die when you stomp on the throttle... (do all this with the car off... its easier...)

now look into your carb with the choke open...(you might need to turn the key to the on position as to get the fuel into the float bowl)

pull the throttle open and closed... just keep popping it... you should see gas getting squirted into your carb... if you don't, your accel pump is dead...

check that then tell us the results! :)



#4 MachineAgeVictim

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Posted 02 April 2006 - 01:39 AM

Thanx moosens, my garage just didn't seem complete without a subaru (after I sold my RS). and I need to get one of those "Charter Member" icons :banana:here's some shots of the new ride http://forums.nasioc...ad.php?t=974257

thanx zefy!!! I'll try that when I get back from Key Largo this weekend, would that be related to not having a vacuum line on the valve on the intake funnel for the airbox? man it's been a long time

#5 Skip

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Posted 02 April 2006 - 08:42 AM

Have we been made the April Fool?

MAV you'll have to prove it's you
by showing the picture of the
special hood you made.

Then I will believe this not an AFJ*


*April Fool Joke

#6 moosens

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Posted 02 April 2006 - 09:45 AM

...somebody help me i just saw the pics :slobber: :slobber:


NICE RIDE!!!!!!!!!!!!

Yup,try the vacuum hose first for kicks.;) Check the one that goes to the brake booster too.

#7 MachineAgeVictim

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Posted 03 April 2006 - 09:51 PM

SKIP!!!! how are ya??

It's not an April Fools joke :lol: but I can't prove it because this hood isn't getting cut even for a NACA air vent :D

I'll be testing the carb tomorrow, but I think it's getting fuel, I saw fuel squirting in from the top, does the throttle need to be wide open? which vacuum hose should I check first? also I noticed the hose coming off the bottom of the airbox is plugged and goes no where, is it important?

#8 Zefy

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Posted 03 April 2006 - 10:19 PM

I'll be testing the carb tomorrow, but I think it's getting fuel, I saw fuel squirting in from the top, does the throttle need to be wide open? which vacuum hose should I check first? also I noticed the hose coming off the bottom of the airbox is plugged and goes no where, is it important?


wait, are you talking about a little one about 8-10'' long and about the width of a pen? there are two that go on the air box... one wraps around the top of the air box and attaches to the little can on the air funnle doo-dad...

the other one is VERY important! it attaches to the intake manifold and without it on you have a MAJOR vacuum leak! it attaches to the manifold on the passenger side... look hard... its right ontop the intake right near a little vacuum can... plugs onto that then into the air can on the bottom...

#9 TheSubaruJunkie

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Posted 04 April 2006 - 12:45 AM

WOAH HEY MAV!!! WELCOME BACK!!!! :)

-Brian

#10 MachineAgeVictim

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Posted 05 April 2006 - 10:08 PM

here's some pics :headbang:

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I took it out again and opened it up more, it seems to "backfire" when I step on the gas but it accelerates fine now

#11 ShawnW

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Posted 05 April 2006 - 11:38 PM

That'd probably be the timing set incorrectly. Oh and welcome back and enjoy your charter icon.

#12 TheSubaruJunkie

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Posted 05 April 2006 - 11:40 PM

Set your timing to 10 or 12 degree's. Also, isnt there something you can plug with a quarter to fix backfire problems on those old EA's?

-Brian

#13 MachineAgeVictim

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Posted 06 April 2006 - 12:02 AM

That'd probably be the timing set incorrectly. Oh and welcome back and enjoy your charter icon.


thank you x2

I'll move the timing, till just before it spudders at idle right?

#14 Skip

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Posted 06 April 2006 - 02:48 AM

An engine running lean will also backfire through the carb.

The accel pump issue will cause it to go lean
when you step on it.

The best method for the timing is the ping test,

advance it till it pings under load then back it off a few deg's.

You have looked at and set the point gap -aye?

#15 MachineAgeVictim

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Posted 06 April 2006 - 10:33 AM

haven't done anything yet :) I'll check it out

#16 Kostamojen

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Posted 07 April 2006 - 12:16 AM

LOL, I missed this thread, but caught the one over on NASIOC :P

Great find :D

#17 MachineAgeVictim

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Posted 15 April 2006 - 07:20 PM

So I'll replace the accelerator pump but where can I buy one?

#18 jonas

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Posted 15 April 2006 - 09:53 PM

HAWT WAGON! :headbang:

#19 Zefy

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Posted 15 April 2006 - 10:41 PM

i'd recommend getting a complete carb rebuild kit... it shouldn't cost more then 50 bucks...

you'll get all the gaskets and the accel pump... just make sure you get the carb kit for the right carb... ask for one for the 1600 and they should be able to help you at the parts store...

you don't need to use the whole kit... yet its a good idea to rebuild it all anyways... just so you know what you're dealing with...

carb cleaner and compressed air is pretty much all you need to do a carb...

#20 MachineAgeVictim

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Posted 17 April 2006 - 09:32 PM

well I got the carb kit ($18) and installed the new accel pump and I still have the same problem, I also replaced the coil... so what else could it be?

I can't find the timing notch on the crank pully, where is the match on the block?

#21 Caboobaroo

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Posted 17 April 2006 - 10:09 PM

ok, timing on these older Subarus is through the bellhousing. If you look in the top of the bellhousing at the back of the engine, you'll notice a hole which you can see the flywheel through. There's supposed to be a large rubber plug over it but sometimes they get lost. Anyways, hook up a timing light and shine it through the hole. You should be able to see the timing marks on the flywheel. If not, with the engine running, take a Scotch Brite pad or some steel wool and press it up to the flywheel to clean it off. I've also had to go back over the timing marks with a white out pen to be able to see them again. Once you can see them, then you'll be able to set the timing correctly.

#22 MachineAgeVictim

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Posted 18 April 2006 - 10:01 PM

Well, I set the timing to 10 then tried 15, still does it, could it be a binding throttle cable? the pedal and throtte comes back just fine, could it be binding when I push it dowI'll have to catch some video of this, it does seem like it's leaning out when I give it throttle under load

you know I should replace the fuel filter, is there only one? or one in the back too?

#23 swiftt

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Posted 19 April 2006 - 11:36 AM

Sounds like you've done some of these but for the sake of being thorough;

  • Check/adjust timing
  • Set point gap (maybe a good idea to just replace points/condenser because they're consumable and so cheap)
  • Check/set plug gap
  • Be sure coil/plug wires are good by checking with an ohmmeter.
  • Check cap and rotor for excessive carbon buildup and cracks/scratches inside the cap.
  • Check for vacuum leaks (carb base gasket, intake gaskets, all vacuum hoses, brake booster, carbon canister). If you don't have a 'tuned' ear and have trouble hearing any vacuum leaks, you can use a spray bottle filled with water. As the engine idles, spray a mist around all the previously mentioned areas. If there's a leak, the water will be sucked into the engine and the idle will drop/die.
  • Set carb mixture (too lean will miss at idle and backfire when accelerating.)
  • Verify carb secondary is opening.
  • If you've a solid lifter engine (you probably do), you should adjust the valves too. A tight, or burnt, valve will cause backfire. A burnt valve will require the head be removed and the valve repaired/replaced.

Good luck!



#24 MachineAgeVictim

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Posted 19 April 2006 - 12:18 PM

Thank you!!
I do have a miss at idle too, and the little afterfire with shut down too, could it be the carb mixture then? where is the adjustment for it?

#25 Caboobaroo

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Posted 19 April 2006 - 01:18 PM

have you checked the anti dieseling solenoid mounted on the side of the carburator? Just a thought sicne you mentioned something about an afterfire when you shut it down. Also, have you tried using some Seafoam through the carb? Might help with whatever might be in there!




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