Thread: New 496 wont run??

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Originally Posted by DennyW

He said in his post that: I am waiting for my fitting to come in so I can install a gauge and see my pressure. My carb has sight glasses so I can see the float levels and they are set to just below half way.

No disrespect meant, but we know he has an excess idle fuel delivery problem. While I missed the "waiting on a gauge" part buried in solid block of text with no paragraph breaks, my bad. However, excessive fuel pressure is a #1 suspect and should be checked first. Regardless of where the sight glass shows on a motor that won't run long enough to adjust properly.

My second question "Can you close the idle mixture screws completely and the motor still run?" While an overly rich condition (burning eyes) could account for the low vacuum (6hg), it could also be indicative of a vacuum leak or transition slot over exposure and closing the idle screws can confirm this.

It has always been my intention to help.

Okay guys, I didn’t want to cause a fight, I just wanted some help. So back to what I have done, last night after the car sat all day I went and turned the mixture screws in all the way and backed them out only half a turn, opened the idle screw up a bit and tried to start it and it started instantly and ran at about 2200rpms. I let it run for about 4-5 mins and shut it off. Checked for leaks and then started it again, it was idling way too high so I closed the throttle screw a bit and it ended up dying again.

After that I pulled number one plug and Bork scopes the cylinder and found just a tiny bit of fluid built up on the piston. I opened the throttle a little bit and it ran again but at a higher rpm, I can’t get it to idle very well at regular idle but I didn’t have much time to let it run and warm up though.

Thanks and yes I have watched that and other videos but most are on the same line as that one where it tells you what the adjustments are but not what they do and the effects on the carb and engine running performance when you do change them. I haven’t really found a video that really covers this well so I can really understand what I am changing inside that carb when I do those adjustments.