Cruez Posted June 15, 2006 Share Posted June 15, 2006 Ok. Here is another problem on a different car. This is on the 510 wagon I drove back from Utah. I only get about 25 mpg and you can tell it is running pretty rich. I checked the vacuum, ignition timing and changed the coil. Still running rich. It has a stock looking hitachi carb, (rebuilt). It has an L18 in it. When you come to a stop and start to go again, it has a stumble right off idle. That is the only time it acts up. It idles fine, doesn't miss. It seems to be a little lacking on power though escpecially in the upper rpm range. Is it possible the cam timing is off ? Quote Link to comment Share on other sites More sharing options...
MONGO510 Posted June 15, 2006 Share Posted June 15, 2006 Check the float level. A sinking float was a very common problem with the hitachi carbs. Quote Link to comment Share on other sites More sharing options...
Cruez Posted June 16, 2006 Author Share Posted June 16, 2006 Float seems to be right on the line in the glass.. Should I try "tweeking" the float ??? Or could it be something else? Quote Link to comment Share on other sites More sharing options...
ezzzzzzz Posted June 20, 2006 Share Posted June 20, 2006 Is the choke stuck closed? Sounds silly but I've seen it before. Quote Link to comment Share on other sites More sharing options...
Cruez Posted June 20, 2006 Author Share Posted June 20, 2006 Choke is opening fully... someone mentioned the power valve might be stuck slightly open... I am going to put another carb in and see what the results are.. That would eliminate 1 factor. Quote Link to comment Share on other sites More sharing options...
Clifton Posted June 25, 2006 Share Posted June 25, 2006 25 mpg sounds pretty good for a 30 year old carbed engine? I'm lucky to get that on the highway with a perfect afr. Quote Link to comment Share on other sites More sharing options...
Cruez Posted June 25, 2006 Author Share Posted June 25, 2006 even with a 1.8 and a 2200 lb car ?? Quote Link to comment Share on other sites More sharing options...
Clifton Posted June 25, 2006 Share Posted June 25, 2006 3.0, 2500lb car. It takes a certian amount of power (let's say 40 hp) to move a a given weight (2500lbs) at whatever speed (65mph). It doesn't matter if it's a 1.8 or 5.7 it will take roughly the same amount of fuel to make that 40 hp to move the weight. There are V8 guys on the board that get same the mileage I get with twice the motor. Do you have a 5 spd or 4 spd? Is your mileage highway or street? If highway, how fast? Anything over 65 and mine drops quite a bit. New Scions weigh 2500lbs and have 1.5l that are alot more fuel effiecent but only get 32 city. They are a little heavier but I can't see an L18 510 ever getting 30+ mpg just becuase it a little lighter. Quote Link to comment Share on other sites More sharing options...
DavyZ Posted June 28, 2006 Share Posted June 28, 2006 26 mpg is what I managed with my stock 510... Davy Quote Link to comment Share on other sites More sharing options...
Cruez Posted June 28, 2006 Author Share Posted June 28, 2006 hmm.. maybe the mileage is ok... but its still running a little on the rich side and slugglish on the top end..which may indicate the fuel not burning completely... I'll take a look at the timing marks on the gear soon... I think that may be the culprit, since the mileage factor has been ruled out.. Quote Link to comment Share on other sites More sharing options...
Shift Posted June 29, 2006 Share Posted June 29, 2006 Isn't that common on carbed cars? Running a little rich I mean. Would think running it a little richer should help with the top end. advance the dizzy a little to run a little leaner. Quote Link to comment Share on other sites More sharing options...
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