Having trouble tuning the new MY wagon

Venom · Post by **Venom** » Thu Sep 30, 2010 3:57 pm

Hey guys,

Trying to sort out my new My wagon and i am having trouble with the car getting way too much fuel.

Car has new transitor style coil (Bosch GT40RT), leads, plugs, very good condition dizzy with new points and vacuum mechanism, second hand carb from Suba bits which was in really good nick. Timing is good, spark is very strong, vacuum is good (EGR bypassed), cylinder compressions are (1 = 130, 2 - 145, 3 - 155, 4 - 155).

I did not touch the carb apart from replacing the float and the little plug mechanism on it and adjusting it slightly. Car is still very rich even with air/fuel screw all the way in. It fouls the plugs in about 5 minutes at idle to the point the car starts to backfire. New carb is jetted exactly the same as the old one so i'm pretty certain it is stock. Old carb has a blocked jet that is crossthreaded in and will not come out, so no good for testing.

Car starts leans out with revs but still seems rich, idle is shocking with lots of black smoke and annoyed neighbours. Cylinder 4 has random knock, maybe bent valve? As i said above it has excellent compression (consistent 155). Not sure what else to do

Mechanics in ballarat not interested in carb problems.

steptoe · Post by **steptoe** » Thu Sep 30, 2010 11:42 pm

blocked air bleeds in carbs can cause odd and various symptoms - try carby cleaner or all purpose thinners dribbled into it not running if carb cleaner not available

discopotato03 · Post by **discopotato03** » Fri Oct 01, 2010 7:21 am

Many years since I've had a carbureted engine .

I guess things to check are fuel level/choke mechanism/anything blocked .
Not running overly huge fuel pump and pressure . If there's a return line is it blocked .

There used to be a way of swapping the leads around on an inline 4 to make the engine backfire (and backpurge) carburettor passages/jets . Don't know which ones on flat four but some ornery old mechanic'l know .

A .

Venom · Post by **Venom** » Fri Oct 01, 2010 8:21 am

Choke is manual and functioning correctly. Carby has been cleaned out with cleaner. It only has one fuel intlet, no return. I will test fuel pressure today. Considering just buying a weber kit, but are these any good for a RWC considering they don't have the same emissions gear?

Post by **TOONGA** » Fri Oct 01, 2010 9:22 am

in regards to the fitting of a weber

http://www.subarubrat.com/Retrofitting% ... V%2032.htm

and concider getting a weber from the US as our dollar is nearly the same as the US sheckle and the webers in the US are up to a third of the price of one here (never understood how that guy on ebay got away with it)

and as for emissions

showthread.php?t=17673&page=4

that way you keep your original aircleaner and 99% of the emissions stuff

TOONGA

Venom · Post by **Venom** » Fri Oct 01, 2010 2:05 pm

Thanks Toonga i was looking for that stock air filter on the weber pictures.

Recarb in QLD is about AU$420 posted for their conversion kit. That is for no choke or idle solenoid.

From the States you can get a 32/36 DGV for around US$190, plus add another 80-90 for the adapter and gaskets etc. Or a full Weber conversion kit for around US$320. Then add around $100 international shipping. Even using a mail forwarding service, then add the mail forwarding costs ontop of that at the end of the day it still works out to be about $400. Although the difference is you get a genuine Weber kit rather than a Empi one from Recarb. Then you need to find a site that will accept international billing and international shipping/mail forwarding addresses.

Also the Gemparts on Ebay who do a recond weber kit for about $600.

Venom · Post by **Venom** » Fri Oct 01, 2010 2:26 pm

Ok bit the bullet and bought the Redline Weber conversion kit from the US, kit number K 730 M. Au$440 inc shipping which was a bit more than the Empi kit from Recarb but alot less than the recon Weber kit from Gemparts, and this kit is brand new

http://www.redlineweber.com/carb-kits/auto/subaru/

If anyone else is interested i purchased it from: http://www.carburetion.com/

Post by **TOONGA** » Fri Oct 01, 2010 4:32 pm

well done and see even with shipping still way cheaper than ebay guy (I refuse to name him)

I was going to suggest a few more things you could try but ditching the aging hitachi carby is probably a good start

Im looking at the modification of the subaru air cleaner as well just to try and hide my EJ20 a bit

TOONGA

Venom · Post by **Venom** » Tue Oct 05, 2010 8:56 pm

Picked up a third carby yesterday from the wreckers. Better than the first two for about 20 mins. I think i understand why everyone says to just get a weber. Thought i would clean it but must've dislodged some black stuff and blocked a jet. So tried putting nice shiny jets from second carb but this cause overfueling again. Swapped it all back over and then i had a different problem again etc etc etc 2 hours later idle is smooth, no misses while revving but still a slight hesitation when stabbing the throttle. Good enough for RWC. Thank f*ck a weber is in the mail

Venom · Post by **Venom** » Sun Oct 17, 2010 4:30 pm

Weber is in, it is awesome. Spent two days trying to work out why car was only running on two cylinders. Problem = i left a rag in the manifold! Ironic considering it was there to stop shit falling in. Pulled it out today, lucky it didn't go all the way.

Cheers,
Rhys

YouTube · Post by **El_Freddo** » Sun Oct 17, 2010 4:48 pm

Venom wrote:Trying to sort out my new My wagon and i am having trouble with the car getting way too much fuel.

I didn't know there was a new MY wagon out

Venom wrote:Weber is in, it is awesome. Spent two days trying to work out why car was only running on two cylinders. Problem = i left a rag in the manifold! Ironic considering it was there to stop shit falling in. Pulled it out today, lucky it didn't go all the way.

Good to hear she's coming along! Got the RWC yet? And do you think the weber carb conversion is worth the bang for buck spent?

Cheers!

Bennie

Venom · Post by **Venom** » Sun Oct 17, 2010 9:26 pm

Comparing it to bang for buck in rebuilding a hitachi i think its a better choice. Car goes well and i'm happy with it. Took me about two hours to fit, and thats including plumbing up the crankcase ventilation hoses to the air filter and new vacuum lines.

Cheers,
Rhys

Post by **TOONGA** » Sun Oct 17, 2010 10:32 pm

lol "now where is that rag I used to keep everything clean?"

good to hear you are enjoying your new weber, they really do make a difference power wise but you must be gentle if you want fuel economy as when that second barrel opens it devours fuel.

TOONGA

YouTube · Post by **El_Freddo** » Sun Oct 17, 2010 10:41 pm

TOONGA wrote:good to hear you are enjoying your new weber, they really do make a difference power wise but you must be gentle if you want fuel economy as when that second barrel opens it devours fuel.

Why not reduce the size of the second jet or does this not work?

Just curious

Cheers

Bennie

1111giles · Post by **1111giles** » Mon Oct 18, 2010 4:40 am

Pay the price and enjoy the fun !:mrgreen:

Post by **TOONGA** » Mon Oct 18, 2010 9:08 am

El_Freddo wrote:Why not reduce the size of the second jet or does this not work?

Just curious

Cheers

Bennie

this works to a point but then when the jet is too small the engine runs lean at revs which makes lots of problems like pinging, overheating, melting pistons or detroying engines

TOONGA