My buddy just picked up a 84 chevy truck the other day, we ran it around alittle bit today. And about an hour ago we went to start it and when if fired up fire came out of the carb. We put the fire out and now it won't start. Any ideas?
backfired and took out something inside the carb or burnt some wires before you got it out? cant really tell ya without being there but thats my best guess
Timings off, give the dist a twist
timing could be way off... found this to be my problem, when my carb was a fire breather loll the dizzy gear was worn down to almost nuthing.... the hold down bolt came loose and was allowing the dizzy move up and down.... but yes check all your wires and what not too, Depending how long it was on fire... I dont think it burned up anything in the carb... If had some pretty good ones going and never a problem with em
Quote from: xjs3667 on July 13, 2012, 08:54:16 PM
timing could be way off... found this to be my problem, when my carb was a fire breather loll the dizzy gear was worn down to almost nuthing.... the hold down bolt came loose and was allowing the dizzy move up and down.... but yes check all your wires and what not too, Depending how long it was on fire... I dont think it burned up anything in the carb... If had some pretty good ones going and never a problem with em
But it wasn't running like the timing was off, it seemed to be fine
Could have taken out the power valve in the carb, usually does when they backfire
Quote from: 71 Highboy on July 13, 2012, 09:44:01 PM
Could have taken out the power valve in the carb, usually does when they backfire
this is true Ive had it happen with a good back fire... but I could always still get her to start.
And really the only I found out that my timing was so far off, was I needed to replace a lifter obviously dizzy has to come out to take off intake and blah blah blah.. It ran just fine after a few pops and occasional fireball out the hood loll but Im pretty sure it was the vac advance taking care of it after she got going...... I was really like wtf? I drove that truck everyday and always thought it was just from my bad lifter it was backfiring like that.... but thats the way it works, try to fix one thing and ya find a whole mess of problems lmao
If you was closer I would give ya hand, its hard to tell without looking at it,
but.... every motor needs 3 things: spark, fuel and air. take one out the equation your motor aint runnin, so check it all over,
Start with spark, make sure your getting spark, pull #1 plug and crank it over, ground the plug good and look for the little blue spark. if thats good.
check timing.
Bring #1 cyl. tdc on compression stroke. take dizzy cap off, make sure rotor is pointing towards #1 cyl.( timnig might be a little off but it will run) if that checks out good,
dump some gas down carb or spray some ether in it, if it fires something bad in carb.
process of elimination, time consuming...yes... better than throwing parts at it...Hell yes :)