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2.8L Motor Knock.. 3rd motor by DKcustoms
Started on: 11-03-2017 06:38 PM
Replies: 3 (165 views)
Last post by: Patrick on 11-05-2017 05:31 PM
DKcustoms
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Report this Post11-03-2017 06:38 PM Click Here to See the Profile for DKcustomsSend a Private Message to DKcustomsEdit/Delete MessageReply w/QuoteDirect Link to This Post
https://youtu.be/wDe5EEQhKTk

the motor in my 87 GT has developed a knock when its warm.

Maybe I should have changed the oil as soon as I got it instead of driving it about 500 miles after it had sat for 5+ years...

Going to try and drop the oil pan this winter and replace the rod bearings.
The last two 2.8s I've had both threw rods (before I got them) due to low oil and poor maintenance, I guess I should have been proactive and not beat it as hard.
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Patrick
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Report this Post11-03-2017 09:14 PM Click Here to See the Profile for PatrickClick Here to Email PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by DKcustoms:




the motor in my 87 GT has developed a knock when its warm.


Perhaps it sounds a whole lot different in person, but over my speakers here it sounds more like a rough-idling engine with some sort of an exhaust leak.

Can you feel it knocking/banging while its running?

[This message has been edited by Patrick (edited 11-04-2017).]

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DKcustoms
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Report this Post11-05-2017 04:20 PM Click Here to See the Profile for DKcustomsSend a Private Message to DKcustomsEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Patrick:

Perhaps it sounds a whole lot different in person, but over my speakers here it sounds more like a rough-idling engine with some sort of an exhaust leak.

Can you feel it knocking/banging while its running?



The exhaust leak sound is from no air filter on the car in the video, its open at the throttle body

Car idles fine, has brand new wires/cap with a new ICM.

Only knocks when warm.
I strongly believe it is knock anyway.
Can low or irregular oil pressure cause knock? Because when it does this the oil gauge jumps around like crazy, but it 5 quarts of high-mileage mobil-1 in it, it has plenty of oil.

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Patrick
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Report this Post11-05-2017 05:31 PM Click Here to See the Profile for PatrickClick Here to Email PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by DKcustoms:

The exhaust leak sound is from no air filter on the car in the video, its open at the throttle body


No, I'm not referring to the high-pitched intake hiss. I'm referring to the deep bassy sound.

 
quote
Originally posted by DKcustoms:

5 quarts of high-mileage mobil-1 in it, it has plenty of oil.


What weight is the oil?

[This message has been edited by Patrick (edited 11-05-2017).]

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