Backfire when accelerating from 40mph to highway speed

leftside11 · Post by **leftside11** » May 11, 2008, 6:15 am

Hi all,

Slick is choking when I attempt to get up to highway speed. Where should I start to look for the problem?

Also what type gasoline are you using to filler up?

What weight motor oil is recommended for the upcoming summer?

Thanks in advance

36truck · Post by **36truck** » May 11, 2008, 8:02 am

Check your power valve & accl. pump on the carb. 10W40 motor oil. Standard rebuild engine regular gas works a hotter engine use premium gas.

racerx1699 · Post by **racerx1699** » May 11, 2008, 8:03 am

What motor and trans do you have?
1. Points and dwell
2. timing
3. Carb
4 Fuel filter
Gas could depend on your motor, I would think reqular would be fine
Oil could depend on your location, I live in Maryland and run 10w 40 all year.
Hope this helps some.

blackagatha · Post by **blackagatha** » May 11, 2008, 9:43 pm

take the vacuum advance hose off the carb and suck on it, if you get a mouth full of stinky air you got a bad advance... that sounds like a likely culprit.

if you dont get a mouth full of stink air, still pop the dizzy and check that the advance moves the breaker plate when you suck. it might be stuck.