Question about Chevrolet Cars & Trucks
Rick may have placed his question in the wrong category but I'll give it a shot... First, Rick, I'm going to have to presume the 'carb' is actually a throttle body and the wires are going to the injector spray nozzles on the top of the 'carb' throttle body.
If your engine is backfiring through the throttle body it can mean one of three things,
!.) First if it runs, or even won't run, double check the spark plug wires to make sure #1 wire goes to the #1 cylinder and the rest are to the correct cylinders too. Just two wires crossed will backfire through the intake with flames. For referencing which is where, The #1 cylinder on 350 small block Chevy is the forward most cylinder on the drivers side of the engine. The cylinder behind #1 is the #3 cylinder the #5 and #7 on the drivers side. The #2 cylinder is the forward most cylinder on the passenger side with #4 behind it then #6 and #8 in the rear. The firing order for all Chevy V-8's is as follows; 1-8-4-3-6-5-7-2. Looking at the engine from the front of the car the #1 cylinder tower on the distributor cap is usually at the 5 o'clock position or pretty close to it. The distributor rotates in a clockwise direction.
2.) The second condition could easily be the distributor timing is off. If you haven't turned the distributor any then that isn't the problem. If it runs double check the ignition timing for accuracy.It should read between 8 - 12 degrees advanced.
3.) Lastly, and this may be difficult to swallow if it's true but here goes. You could have either a sticking intake valve or a flat cam lobe on one of your cylinders. To check this pull the wire off the distributor cap and put it back on one by one to see if the engine runs differently with it off. If no change if found that is your failing cylinder to investigate. By that I mean to check the compression reading on that cylinder.
Changing Distributor Cap and Rotor Chevrolet Truck GMC 350 305 How to 1988 95 GM Truck Ignition Systems
Posted on Dec 06, 2016
Testimonial: "ok I have had dealings with a flat cam lobe recently and that's not the problem it's something eles and the wires are correct when I change plugs I did 1 at a time"
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Posted on Jan 02, 2017
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