Just Converted From Points To HEI Distributor On My 71 Impala. Timing Is Set But I Now My Carburetor Pops

There are 11 Answers for "Just Converted From Points To HEI Distributor On My 71 Impala. Timing Is Set But I Now My Carburetor Pops"

1. Infoman6617 says:

   Not in time yet or you have a wire crossed
2. Lt1bbody says:

   Did you take the vacuum advance line off and plug it before you timed it? If not the timing may be too far retarded and making it pop.
3. Alanrt1 says:

   Recheck the timing. The distributor may have been put in one notch off.
4. Mrmischief27 says:

   You need to mess with the timing a little more.
5. Dodge Man says:

   The timing is still to retarded on it try advancing it up some,high energy ignition distributors run more advance than point ones do,keep going a few degrees higher with it until it stops popping and make sure the timing was set to no-1 on top dead center or else you may not get it to stop ,i have change d a bunch of those over before,they run better with hei in them,good luck.
6. Tom B says:

   Check your firing order again
   18436572
7. Alyssa S says:

   If you set your timing with a timing light it will be wrong because it is set for the points not the hei so you need to mess with the timing until it doesnt make the popping noise anymore and you can only do that by ear. so loosen the distributor and start the car and turn it until its not popping anymore. hopefully that will fix it.
8. Bobweb says:

   Make sure the timing chain is not so worn as to cause a big variation in timing.
9. Hummertech H3 says:

   If the car did not do this before then it obviously has something to do with the distributor, it is possible the distrubutor was stabbed 180 degrees out of time, it is also possible that it could be a tooth off, best thing to do is bring the #1 cylinder (front left) to top dead center on the compression stroke, then line up the distributor pointer with the #1 spark plug tower, now you know you are in time, then use the timing light to set the timing for 6 degrees before tdc with the vacuum hose disconnected and plugged. also make sure the b+ terminal on the distributor has 12 volts to it, the points should have had a resistor wire and you aren’t getting a full 12 volts, also verify the firing order, the cylinders are 1357 on the left side (driver’s) and 2468 on the passenger’s and the order is 18436572.
10. Origdirtyoldman says:

    Depending on the pop the distrib is 180 degree’s out, the distrib is one tooth off, or you have the spark plug wires on the wrong plugs.
    Are you sure the engine was TDC on number one when you put it in? As the distrib goes in it rotates about 3 degrees as the teeth mesh, did you offset it before pushing it down.

    Turn your engine over until the timing marks line up on #1 (intake valve just closed, exhaust hasn’t open yet, or put some toilet paper in #1 and #6 spark plug holes, #1 will blow out and #6 will suck in when the engine is TDC. The roter in the distrib will point at number one wire. Then make sure the rest of the wires are in the correct order, on the intake manifold the firing order (plug wire order) is cast in front or behind the carb.
    Also check the OHMs reading on the wires. The reading should all be close to each other. If one of the wires was damaged, it will crossfire to the next cylinder especially #5 and 7. Also wipe the inside of the distrib cap with alcohol. If you dropped the distrib, there may be a hidden crack that is causing a crossfire.

    Also another major thing. Your points were 6 volt, the HEI is 12 volts. On your firewall is a 2 inch long white ceramic block. This is your step down resistor. Bypass this block to raise the voltage up to 12. If you can’t find it, on the steering cloumn wiring harnes, you ignition switch has two leads ign1 (wire to the restistance block) and ign2 (12 volt wire straight to the coil fore starting). Put a “suitcase connector” on these to wires to act as a jumper.
11. Chevyraceman_383 says:

    Timing is wrong, dizzy installed on wrong stroke. 180* off

    Pull dizzy and re set it again.

    #1 and #6 cyl are both at TDC at the same time.. 1cyl is ready to fire and other one is noty.

    Make sure you get #1 on the compression stroke