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Back fires thru carb when excellerating but lopes when u take off manual trans

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Do you hear a pop pop poping under heavy acceleration or just one big back fireing when first accelerating? it could be an intake valve pop pop poping,and electrical,on the big bafireing under lite to med load. A cracked,or worn cap and rotor,weak coil wire,dirty carbruator,faulty accelerator pump in carb bad vacumn advance !slow ignition timing. BAD points and condenser if equiped on older model with carb.

Posted on Sep 03, 2010

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Start by testing fuel pressure. If not at specs, change filter and fuel pump. Pressure should be high, probably in the 40-50 psi range, any shop could tell you specified pressure. Also check for trouble codes, use a scanner.

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Back fires thru carb, dies if i take foot off gas IF i get it to start

Sounds like a timing problem. Back firing through the carb usually indicates that the timing is after TDC instead of before TDC. Not running would be an indication of the same. The normal timing is just a few degree before TDC (BTDC).

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Car starts ok then stops when you take your foot off the excellerator to back up or go have to keep your foot on excellorator untill engine warms up.before that if you have to stop at a stop...

clean or replace your IAC, idle air control valve. you can clean it with a can of spray carb cleaner. also clean the throtle bore and plate. use an old tooth brush to get in there.

the IAC controls your idle speed. it can become gummed up with deposits.

use the rest of the carb cleaner to check for vacuum leaks. just run engine and shoot short bursts at hose fittings and connections. The idle speed will change if you find a leak. dont catch on fire doing this!

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