Ok so tonight I decided to give my 75 comet a push as in flooring it so I do and get it up to about 90 and it backfires.. So I go to slow down and as I hit about 15- 20 mph it starts missing real bad so I go to stop and it stalls so I turn the key and it starts back up but is running like crap.. So I limp it home with it dying at every stop well I finally get it home and it's serging pretty bad so I put it in park and it's still missing bad and pop the hood to see if any vacuum line came loose but could not find any so I turn it off and go to star it and it doesn't start.. Just turns over.. I have checked spark it's getting it and tried starting fluid and still nothing.. Could it have jumped time? The rotor spins but it's acting like it's getting no spark.. I have no idea what else it could be any help would be appreciated I
Well the old saying goes if you have fuel and spark it should run, that is if the spark is at the right time. Could be that your timing chain is shot and jumped. I would put the engine at top dead center and pull the distributor cap off and see where the rotor is pointing, at least that is a good place to begin
Make sure that the TDC you have it on is the #1 TDC, the crank makes two revolutions for every one of the distributor. If you have it on TDC and it's pointing at #6, then go around one more turn for #1. While doing this, you can also use a breaker bar and 15/16" socket on the crank bolt and while turning the crank back and forth, watch to see how far you can turn the crank before you see the distributor rotor move. If it's more than a few degrees, then the timing chain and/or gears are shot
Ok went out to try and start it and it started right up but Idled rough then died and had some white smoke ccoming out the exhaust but still will start right up.. Was wondering if maybe that Backfire might have did something to the carb? I can also smell gas inside the cab. Maybe getting to much gas or not enough?
If the carb is an older Holley when it back fired it may have blown out the power valve, you will still want to check for timing issues though
It's A 4 bbl weber carb it looks like an edlelbrock also I noticed that it looks wet all over it and had some gas pooled on the valve cover flange..
Okay I took a look at your pics and see you are running an Edelbrock, I dont know anything about them. I did notice the air cleaner you are using though, I have seen that style catch fire from a back fire through carb. The foam catches fire, very scary.
Hope it's not as hard as a holly had one on a Chevy and went to rebuild it and was totally lost haha anyways I'll pull it off and take a look at it
And that can't be emphasized strongly enough... Only 4bbl carb simpler than a Holley is a 4100 Autolite...
Ok got to looking at and checked the timing and from what I can see its sitting at 20 before tdc? And as for the carb it looks to be leaking at the accelerator pump? And all the gaskets seem to be soaked in gas.. And when it's running it seems to be.. On a phone and can't upload pics of what I'm talking about but it's the part has the throttle hooked to with a shaft going into the right side of the carb..
Here's as good as I can get on this phone.. I just recently moved and have not had the Internet turned on yet.. http://i.imgur.com/bJS7Ipa.jpg
If you have a vacuum gauge would be a good idea to check to see if it rapidly falls to nearly zero as the engine stalls... If so you could have a plugged catalytic converter that was damaged by the high speed run...
I have no cats. Headers to h-pipe to flows. And only way I can keep it from stalling is turn up the idle screw..
