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454 Backfiring issue

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che77y

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« Reply #25 on: March 24, 2015, 10:30:42 PM »
Perhaps a few lazy lifters since she's been sittin?


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« Reply #26 on: March 25, 2015, 06:23:11 AM »
Brad does it clean up at higher rpm's?


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« Reply #27 on: March 25, 2015, 06:31:11 AM »
Brad does it clean up at higher rpm's?


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Nope.

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« Reply #28 on: March 25, 2015, 06:39:41 AM »

Nope.

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. Just having the carb rebuilt sounds kind of fishy.


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« Reply #29 on: March 25, 2015, 07:01:01 AM »
. Just having the carb rebuilt sounds kind of fishy.


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Sort of kept trying to go down that road. ...

I think so too.

I'm thinking stupid lean somewhere.

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« Reply #30 on: March 25, 2015, 07:10:42 AM »

Sort of kept trying to go down that road. ...

I think so too.

I'm thinking stupid lean somewhere.

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. That's what it sounds like I would have the carb rebuilder have another go at it or find a new one.


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« Reply #31 on: March 25, 2015, 07:16:07 AM »
. That's what it sounds like I would have the carb rebuilder have another go at it or find a new one.


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There are two on a tunnel ram. Twice the opportunity for a slight boo boo.

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« Reply #32 on: March 25, 2015, 07:18:37 AM »
The thing is that the backfire isn't a lean pop. It's a loud bang with 6" of flame shooting out. To me thats unburnt fuel getting into the header and burning.

The other thing is that its rhythmic. If I wasn't standing in front of it and checked the firing order maybe 5-6 times myself, I would bet it was a crossed plug wire, but its not.

Hal is bringing over a ready-to-run distributor today and they are gunna give it a go. If it still does it after that, I'm starting to wonder if the timing chain went bad.

Also, its a MSD 6a box, no rev chip in it.
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« Reply #33 on: March 25, 2015, 07:35:05 AM »
The thing is that the backfire isn't a lean pop. It's a loud bang with 6" of flame shooting out. To me thats unburnt fuel getting into the header and burning.

The other thing is that its rhythmic. If I wasn't standing in front of it and checked the firing order maybe 5-6 times myself, I would bet it was a crossed plug wire, but its not.

Hal is bringing over a ready-to-run distributor today and they are gunna give it a go. If it still does it after that, I'm starting to wonder if the timing chain went bad.

Also, its a MSD 6a box, no rev chip in it.

So the grounds were good and the pickup wires didn't get reversed?

I was sure that was a possibility.

It could be cross talking, but with two different caps, rotors and wires. It sort of all but eliminates it.

I would eliminate fuel stuff first. But trying the distributor cannot hurt.

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« Reply #34 on: March 25, 2015, 09:26:07 AM »
Is an hei distributor make sure the metal ground strap is in the cap, I've seen those get left out.

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« Reply #35 on: March 25, 2015, 12:01:15 PM »
Is it possibly  the swapped firing order? I forget what cylinders they swap but maybe thats it. Or  is it jumping spark. In the wires?

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« Reply #36 on: March 25, 2015, 12:08:13 PM »
The swap is 4 & 7

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« Reply #37 on: March 25, 2015, 12:09:10 PM »
Thanks for the help but as stated the firing order has been checked a dozen times.
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« Reply #38 on: March 25, 2015, 12:13:21 PM »
Ok wasnt sure if maybe it was forgotten that it was swapped

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« Reply #39 on: March 25, 2015, 04:01:00 PM »
This Fukker running yet?  Lol

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« Reply #40 on: March 25, 2015, 04:20:09 PM »
I got my money on some bent pushrods 👍


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« Reply #41 on: March 25, 2015, 04:36:13 PM »
Not yet we will be working on it again tonite so fingers crossed

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« Reply #42 on: March 25, 2015, 06:16:32 PM »
Popping out exhaust, cyl is firing with exhaust valve partially open. Pull one plug wire at a time when the popping stops you will know what cylinders are causing the problem. Sounds like incorrect firing order.

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« Reply #43 on: March 25, 2015, 06:39:44 PM »
Popping out exhaust, cyl is firing with exhaust valve partially open. Pull one plug wire at a time when the popping stops you will know what cylinders are causing the problem. Sounds like incorrect firing order.

not trying to be rude, but we checked the firing order a million times as stated above.

If I had not even checked it myself several times, I would agree with you.
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« Reply #44 on: March 25, 2015, 06:47:54 PM »
could there be moister in the distributor or a cross feed between wires?
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« Reply #45 on: March 25, 2015, 07:50:42 PM »
Still doing it with a new distributer.  Checking float levels now

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« Reply #46 on: March 25, 2015, 08:05:13 PM »

I got my money on some bent pushrods 👍


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I have to agree or a couple stuck valves.  Seen this a couple times.  Has there been valve covers pulled yet??


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« Reply #47 on: March 25, 2015, 08:12:53 PM »
X2 on pulling the valve covers.

Could you put a timing light on each wire to verify each cylinder is consistently firing?
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« Reply #48 on: March 25, 2015, 08:15:10 PM »
Did the plugs get checked?
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« Reply #49 on: March 25, 2015, 08:41:02 PM »
I think we got it :)


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