93 351w popping backfiring through intake

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Dec 21, 2014 | 11:55 PM

351wmudder

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93 351w popping backfiring through intake

I've had this truck for couple years just sitting it has done it since i first bought it and let it sit do to other projects. Well now Ive been working on it and I'm about start college to be a auto tech and I was wondering what would cause this to happen I've read on multiple sites from running to lean to jumping a timing chain tooth and so on and none have really have an answer to what it was so can tell me what they think it is it pops under load. Thanks in advanced for the replies and information.

Dec 22, 2014 | 12:32 AM

JKNW

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Popping through the intake is a timing issue. Could be as simple as someone has the plug wires in the wrong firing order.

Dec 22, 2014 | 12:46 AM

351wmudder

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Thanks for the quick reply I'll get the firing diagram back out and double check again

Dec 22, 2014 | 12:55 AM

351wmudder

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Well its not that simple of a fix wire wise lol

Dec 22, 2014 | 02:58 AM

grinditout

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distributor could be 180 out.

Dec 22, 2014 | 07:29 AM

rla2005

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From: Kentucky

Quote:

Originally Posted by grinditout

distributor could be 180 out.

The truck would not start and run if that was the case....

Dec 22, 2014 | 09:47 AM

351wmudder

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Quote:

Originally Posted by rla2005

The truck would not start and run if that was the case....

It runs and idles fine just when ever you give it sudden rpms it'll start the popping noise not sure what it could be never had a motor do this.

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Dec 22, 2014 | 09:57 AM

David7.3

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From: Oakhust NJ Jersey Shore

Bent pushrod. broken valve spring. Way lean condition. check fuel pressure first. Of course check your firing order. Bust out your old vacuum gauge, watch the needle, should see a steady 15-18 inches. Than accelerate and she if it drops smooth or bounces around, you can narrow down your valve or pushrod that way, I have seen cam lobes round out and not give you the lift you need.