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Post by saqib777 on Jan 2, 2013 5:07:47 GMT -5
Hi all, Here in Pakistan, most of us drive their cars primarily on CNG rather than petrol and so do I. Since cars are more tuned for gas (timing etc), there're much issues in carbs in pretty much all old cars due to ill maintenance. When I bought the car about 5 years back, its carb had to be changed straight. Now after the swap, I was mis-lead and had drilled the carb to install an injector for CNG (at the back side) thus to remove the venturi. It did give me awesome performance on gas but totally screwed the carby itself. Car DOES run on both fuels but on petrol, I'm getting black smoke and poor mileage (both idle and accelerated condition). Running too too rich. There's knocking too if try to accelerate too suddenly. I know this is a repeated question and discussed many times, but how am I supposed to achieve a better mileage by adjusting the air fuel mixture? Also where to locate this adjustment? I went through all diagrams but couldn't locate the adjuster. Just a note, I also had the distributor modified for electronic ignition about 4 years back. Installed an NEC chip. Removed the hassle of point, much better pickup. So that shouldn't really be an issue. Plus, it seems that I have various vacuum lines missing. Could someone guide through here? Many Thanks. s772.photobucket.com/user/dapower777/media/Subaru%20Justy%20Forum/01012013017_zpsc657ad55.mp4.htmls772.photobucket.com/user/dapower777/media/Subaru%20Justy%20Forum/01012013018_zps7d872fba.mp4.html
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Post by saqib777 on Jan 2, 2013 5:21:10 GMT -5
One more thing noted, the screw I mentioned to be hidden in this picture, it seems to cause no effect. What is it for anyway?
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Post by gearheadeh on Jan 2, 2013 7:05:55 GMT -5
Hi all, Here in Pakistan, most of us drive their cars primarily on CNG rather than petrol and so do I. Since cars are more tuned for gas ( timing etc), there're much issues in carbs in pretty much all old cars due to ill maintenance. There are a lot of dual fuel (Gasoline and Propane) vehicles in North America. They use an aftermarket ignition control made by Autotronic that adjusts the ignition to be optimum for either fuel, this would help with the knocking you experience whilst on Gasoline, because you have it adjusted to optimize for the Natural gas.When I bought the car about 5 years back, its carb had to be changed straight. Now after the swap, I was mis-lead and had drilled the carb to install an injector for CNG (at the back side) thus to remove the venturi. It did give me awesome performance on gas but totally screwed the carby itself. If the venturi is gone.. .. .. it is gone. Better to start with another factory carb and install the CNG line in a better spot. There is no way to adjust the overall fuel mixture on a gasoline carb. One has to remove and replace fuel metering JETS to do that. you are thinking of the idle mixture screw which doesn't affect overall mixture in that way.Car DOES run on both fuels but on petrol, I'm getting black smoke and poor mileage (both idle and accelerated condition). Running too too rich. There's knocking too if try to accelerate too suddenly. I know this is a repeated question and discussed many times, but how am I supposed to achieve a better mileage by adjusting the air fuel mixture? Also where to locate this adjustment? I went through all diagrams but couldn't locate the adjuster. Just a note, I also had the distributor modified for electronic ignition about 4 years back. Installed an NEC chip. Removed the hassle of point, much better pickup. So that shouldn't really be an issue. Plus, it seems that I have various vacuum lines missing. Could someone guide through here? Many Thanks. Might be of a little help:subarujusty.proboards.com/index.cgi?board=howtos&action=display&thread=2257
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Post by gearheadeh on Jan 2, 2013 10:15:06 GMT -5
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Post by saqib777 on Jan 2, 2013 23:13:21 GMT -5
Thanks gearheadeh, I did visit a couple of carby experts here who after inspection simply refused to repair saying it'll be of no use. He said, that their could be serious damage done to jets due to the drill. So I guess I'll have to search for another non-tempered carb. I do have an electric valve on the gas kit. Any help on the vacuum lines? specially the one I highlighted in the picture... I really would want to get this carb to be improved in some manner since hunting in the junkyards for a good working carb isn't easy either. Also, what's this for? It's not connected to anything in my car. Can you guide where does this go? A few more:
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Post by hashim5003 on Jan 3, 2013 3:55:56 GMT -5
AOA! saqib. I have that car too. can you plz tell me that from where you done your car's mechanical work?
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Post by saqib777 on Jan 3, 2013 4:27:28 GMT -5
hashim5003W/salam. I didn't visit a mechanic for more than 3 years now. Just routine lubricant change etc. For engine/carb etc I had a guy who's now in middle east. Was in I-9 Islamabad. But this car has made me visit the suspension guyz alot. Seems no one can understand it's front suspension. For that I have tracked an expert in Gwal Mandi and one in Chah Sultan, Rawalpindi. Where're you located?
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Post by hashim5003 on Jan 3, 2013 5:54:11 GMT -5
Yeah it's front suspension is very difficult to understand. I live in Lahore. It's carb is creating a problem, I didn't get it serviced since i bought this car 6 years ago. i need its brake work done. no one understand what the problem is.
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Post by hashim5003 on Jan 3, 2013 5:56:47 GMT -5
I saw your car. It's in very good condition.
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Post by saqib777 on Jan 3, 2013 6:05:06 GMT -5
hashim5003Thanks for the compliment What problem are you facing on brakes? front or rear? This car has good braking. Maybe I can help. You know, when I used to take the car to any mechanic, they simply wouldn't understand the issue so how to resolve is far from possible. So I used to take print-out of layouts and actual diagrams to make them understand. Believe me, that helped a lot.
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Post by hashim5003 on Jan 3, 2013 12:49:18 GMT -5
I have to press the pedal at least two times to make the pressure then it works. i also changed the master cylinder but nothing happened. Now I am thinking of to change the booster, but i don't want to resolve the problem by changing everything. Actually i didn't give much time to this car and used very rarely. After my studies I am planing to recondition it.
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Post by saqib777 on Jan 4, 2013 9:16:32 GMT -5
If you haven't already replaced the pads and seals then do check one last thing before swap. If engine is healthy then still the pressure will decrease if rear drums are worn out which is quite probably in old cars. What brand is your brake pads?
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Post by hashim5003 on Jan 13, 2013 9:46:59 GMT -5
don,t know about brand of pads. didn't even replaced them. can you tell me that where is that corburetor person in gawal mandi becoz my car is not starting on petrol. i need to fix that. and if i get some manual then may be i could do it on my ownself.
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Post by saqib777 on Jan 13, 2013 10:47:41 GMT -5
Well, that's the problem. The carby guy left the country I myself am tracking someone good at Hitachi carbs.
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Post by saqib777 on Jan 13, 2013 14:58:12 GMT -5
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Post by hashim5003 on Jan 14, 2013 1:17:26 GMT -5
I will take the photos. yesterday i checked the carb and start the car i noticed that it is throwing petrol out of carb towards air filter!
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Post by saqib777 on Jan 14, 2013 1:33:04 GMT -5
It's definitely flooding. You can have it remade. It'll be costly considering the gas crisis situation these days. I would suggest to have the carb completely tuned for petrol, stay away from gas. I'm also planning the same. It's just that I had a gas injector drilled in my carb. What Model is yours? 1st or 2nd Gen? Do you still have the original vacuum lines correctly installed?
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Post by hashim5003 on Jan 14, 2013 2:38:50 GMT -5
I have 2nd gen. I think both have the same engine? no vaccum lines are not installed correctly. I found pics of the vaccum lines on this forum. I will post it asap.
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Post by saqib777 on Jan 18, 2013 1:03:56 GMT -5
Eagerly waiting for the pix I need all the help I can get on vacuum lines. Also plz do post pix from your car. I bet it'll the same model of the carb too. I even have doubts on the fuel line connectivity. If... 1st line is for fuel INLET 2nd line is for fuel RETURN Why there's a 3rd line? What are the correct connections? Comfused...
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Post by Armageddous on Jan 18, 2013 15:08:59 GMT -5
A brake pedal that needs to be pumped up is more then likely an issue with the rear brakes either out of adjustment or a broken spring, etc.
As far as your rich running on petrol issue goes it really sounds like your carburetor is screwed.
As far as your vacuum lines, I highly doubt they're causing any issues. Most of them won't affect your car in the way you're describing, and because your ignition is modified a lot of your lines could have been deleted because they were not needed.
My advice is to locate an aftermarket carburetor and adapt it to fit your car, finding a stock one for your car that both works good and is unmolested is not going to be easy, and if the drilling/tapping of the propane line doesn't work again, you could be wasting a lot of money.
Terry
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