Posted by rickyracer (IP: 209.20.170.79) on February 01, 2000 at 00:02:12:
In Reply to: Drivability problem posted by Erik on January 31, 2000 at 18:48:04:
:a little carb test, just spray a little WD-40 at the throttle shafts and listen to the engine, if the speed changes at all the shafts are worn. Your jets are probably way to big for the 302. 600 isn't to big but it is possible to have to big of jets. What size are they and what do the plugs look like. The only way those secondaries will open up is under a in gear, down the road load, and you can the spring in the dashpot to change the opening time.
I know what you are thinking if you have read my previous posts, damn that guys car is piece of junk.I posted these question last nite I think but the MB was changed so it got lost I guess.Anyhow , my problem is my car doesn't seem to be running at full potential and it gets bad gas milage.My engine now has about 700 miles on it since the rebuild and I would think it should be freeing up a little and getting good milage by now, but it only get on an average 13.5 miles per gallon between city/highway.Now I am not sure why this is happening so please tell me if there is something wrong with my set-up and let me know if my assumption is correct.Rearend is 3.00:1 , C4 trans., 302 (stock bore/stroke), cam: DUR. 260 int. , 270 exh., Valve lift:.424 int., .448 exh., I am running headers and Edlebrock performer intake.Now here is where I think my problem is , I am using a 600 cfm Holley from a 75 F250 that had a 390.The carb. is running really rich and I have leaned it out as much as I can ,but it is still rich(If I lean it too much it won't idle smooth)possibly the jets are too big? I am also babying the car and still no luck with MPG.Also , the carb. throttle shaft doesn't have the pin for the A/T kick down , so I am running it without , any problems with that?And final question , my secondaries don't seem to be opening (at least not when floored from stop, haven't taken speed high enough to see if they open at high speed)what could be causing this?Should I just junk this carb. in favor of an Edlebrock?