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So i was doing some testing down a privet road trying to get ready for the first race May first and my car pulls good through first then i hit second and at about 5000rpm it starts missing and poping through the exahst and when it gets into 3rd i cant get over 85mph any ideas on whats going wrong? Its never done this before 3 days ago i had a gps in the car hit 115mph no prob? Im confused! help!
 

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engine problems

I just went through this with my crossfire distributer cap, change it out and try it, mine was popping out the exhaust also. hope this helps------Jess
 

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Sounds like the same thing mine was doing: pulled hard to 6000 rpm in first, then went flat half way through second gear. If you have a Holley, the fuel may be going to the back of the secondary bowl and starving the secondary jets. I put jet extensions on and it cured the problem. If is not a Holley, give us more info (type of carb, size, fuel pump, ignition, etc.)
 

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Discussion Starter #4
Its a 305 with a 1406 edelbrock brand new accel disributor with a accel super coil new street fire plug wires and a stock fuel pump. Headers and 2.5in exhast.
 

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In first gear it isnt under as much of a load as 2nd and 3rd. Since you have all new ignition it sounds like you are dropping off in the fuel delivery. It revs up to higher Rs in first, prolly in park too? No load. Its starvin for fuel. Just poking around but replace the fuel filter(s) JR
 

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Personally I've never heard of a lean condition(lack of fuel) causing backfiring thru the exhaust. That's not to say it can't happen...? but if the engine is laying down during the run I'd say check your fuel delivery. Best way is to put in a fresh set of plugs, go make a full pass, at the end pull over and pull a plug. If it looks like you just installed it more than likely you're lean and you need to jet it up. With those edel's you need to change the metering rods. Do yourself a favor and go buy a book on how to tune those Edelbrock/AFB carbs. Or get a good old fashion holley carb.

Also check to see your timing isn't advancing past 3,000. If it's still it could cause a misfire at high RPM.
 

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Make sure your spark plug boots aren't touching any header tubes.

Don't over think it, check the easy stuff first.
 

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Its never done this before 3 days ago i had a gps in the car hit 115mph no prob? Im confused! help!
Or get a good old fashion holley carb.

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I doubt that throwing money at a Holley will fix his problem if it did not do this 3 days ago with the Edelbrock. Sounds like electrical to me.
 

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The first thing I would do is check the timing to see if it has moved. If the hold down isnt tight, the distributor will eventually move. If the timing hasn't changed, I would follow these guys advice and check the wires, cap, rotor, etc.

Good Luck
 

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I doubt that throwing money at a Holley will fix his problem if it did not do this 3 days ago with the Edelbrock. Sounds like electrical to me.
I only suggested that because there are people out there that don't like messing with them carbs. I can't speak for him but holleys are alot easier to tune IMO. I did suggest to buy a book on them carbs so he can read up on them, see what they're all about. And yes it could be electrical...kinda of a broad statement like, " it could be mechanical..."
 

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i had bought brand new accel super coil and cap rotor did the whole tune up my car ran fine then about a week later i started having the same problem.i went nuts trying to find the problem.checked everything including replacing the fuel pump.i was about to give up then i took out the new accel super coil and stuck my old coil WOW my car ran fine.i called accel the guy on the phone was (oh you got a bad coil just send it back it happens once in a while.)i was in shock that it was no big deal to them.like it happens all the time.
try the coil
 
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