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Knocking in Engine?

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Old 07-19-2015, 01:09 PM   #1
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Hi I'm a 16 year old owner of a base model 1970 mustang 302 v8 5.0L and I know what you're thinking "that dumb 16 year old probably hot rodded the **** outta that car and threw a rod." Wrong! I am aware of how much of a delicacy having a car like that is I baby it even though it is my daily driver... So 8 have a modded HEI Distributor to fit a ford and I was casually driving to work when I took a turn and noticed my car had died. I had noticed it was off time when I tried to restart it. I loosely defined it and drove the last block to eork. When on my way home I had discovered a slight knocking noise and as iI refined my car for real and adjusted carb a bit while car was running it increasingly got worse and at this point I'm scared to drive it and I would like to know what you guys might think it is BTW I still have good oil pressure
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Old 07-19-2015, 01:12 PM   #2
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I* not 8 and re timed not defined
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Old 07-19-2015, 04:43 PM   #3
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Knocking is tough to diagnose without hearing it. You need to make a video of it. Could be a lot of things. First place that I would start is with that HEI dizzy, make sure that the bearings are OK and the rotor isn't hitting the cap. Beyond that, could be a rod, lifter, detonation, etc.

You might also verify that the mark on the balancer is actually TDC
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Old 07-20-2015, 09:30 AM   #4
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You didn't say how many miles on the engine or how you determined the timing was off. There are many different knocks as JC316 said. Is it a detonation knock or a mechanical knock? Did the distributor move or is the rotor pointing move? If the engine has many miles, you could have jumped the chain because it is stretched. Make a video with sound so we can hear what you are talking about.
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Old 07-22-2015, 12:45 PM   #5
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The question I have is why a 16 year old with a 1970 Mustang isn't hot rodding the **** out of it?
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Old 07-22-2015, 03:25 PM   #6
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I think it barely has 2000 miles after the overhaul iI did on it 3 months ago and its definitely a mechanical knock iI think from the oil pan and i will try to get a video asap and i dondon't hotrohotrodhotrod iitit bc imI'm smart and know iI will be the one fixing iit
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Old 07-23-2015, 08:03 AM   #7
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Posting up a video of the noise might help but unfortunately determining where a knock is coming from can be tough even if you're standing right over the engine much less over the internet.

If your distributor checks out then pull the valve covers and see if the rockers are still in place. As you rotate the engine see if everything is going up and down like it should.

If everything looks good then you will need to go deeper and pull the heads to look for any scoring on the cylinder walls. Keep in mind that it just take a little bit of scoring to make the engine sound like it is beating itself to pieces.

If everything looks good there, now you're pulling the pan.

It sucks. We have all been there and feel your pain.


What kind of oil pressure do you have?
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Last edited by fastbackford351; 07-23-2015 at 08:08 AM.
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Old 07-23-2015, 08:03 AM
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