3800 series 1, 89 Sword w/engine knock - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-26-2011, 05:11 PM   #1
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Unhappy 3800 series 1, 89 Sword w/engine knock

I was updating the engine tuneup by clearing the OBD1 codes, EGR and low power...
The last tasks were plugs & wires....it seemed to have worked for only a few minutes to an hour @the most.

The idle seems fine and the accelerator peddle indicated a LOT more power...but an engine knock appeared...rather loud @that....

I checked the OBD1 codes again...Check cam sensor and/or knock sensors
Did this to both...even replaced them w/spares from the bone yard...but the engine knock it still present.

Since this engine doesn't have any mechanical way to adjust the timing/dwell from a distributor....I am seeking advise from other members who have had experiences w/engine knock....

I had given up on the engine knock being from the cam or knock sensor...for a nosier or loose valve lifters.... So I cleaned them w/commercial solutions...dropped the oil pan for inspection & cleaning...

Found some very fine metal shaving...but nothing unexpected for 245,000 miles...the lower end of the pistons looked clean & nothing loose...Nice & tight looking...

W/new oil filter, fluids & conditioners...the engine knock is about 1/2 the volume level but still there...the idle is still smooth but the accelerator power is fairly weak. OBD1 is still giving the cam & knock sensor "alarm"...!!! My Haynes repair manual has been somewhat helpful but it is fairly generic for specific "solutions"....

I would like to keep the old Sword alive but I don't want to "pour" hundreds of dollars into a deepening HOLE...

Any thoughts, experience or knowledge about engine knock solutions would be greatly appreciated...Thanks
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Old 07-26-2011, 05:14 PM   #2
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Is this a knock you can hear? Is it lower in the engine? You said you found metal in the oil. What'* your oil pressure?
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Old 07-26-2011, 05:24 PM   #3
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The engine knock appears to be on the lower end of the engine....No I have not done an oil pressure test .

The engine knock seems to be present mostly when there is not "peddle" pressure...if that'* of some help

Thanks for the rapid reply & question(*)...
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Old 07-26-2011, 06:02 PM   #4
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When I get home I will post a video and you tell me if that'* what yoru hearing.
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Old 07-26-2011, 07:50 PM   #5
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Red face 1989 LeSabre 3.8 L engine knock

I'll try to post a video clip w/audio of my engine knock....Couldn't find a way to attach it here...Sorry


I have a "cold start" (it'* 100 degrees @the moment...!)....idle w/a few pushes on the accelator peddle.... Then the ignitian is turned off....a re-start is made w/a few pushes on the accelator peddle again...

This time I did notice that the engine knock is present during the entire time it is 'running'...not just @the idle time. You just can not hear the engine knock as much because of the louder noise coming from the EGR valve....I'll have to inspect & test that again but it doesn't throw a OBD1 code anymore.
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Old 07-26-2011, 10:06 PM   #6
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Hard to hear in this video.


This one you can really hear.
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3800 series 1, 89 Sword w/engine knock-th_m4h03823.jpg   3800 series 1, 89 Sword w/engine knock-th_m4h03825.jpg  
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Old 07-27-2011, 12:38 AM   #7
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Unhappy Sounds like I have heard your engine before...

Hi Danthurs:

Yes, Yes....that sounds very similar to my engine knock...

So have you solved your engine knock....?



I noticed you used photobucket to post your videos...I'll try that for my short video clip to compare or hear my engine knock...straight from the old Sword...
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Old 07-27-2011, 01:02 AM   #8
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Thumbs up another video attempt

Let'* try this again...still having issues....

So here is a link to photo-bucket:
http://s1139.photobucket.com/albums/n545/embassary2002/

Hope this is working...
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Old 07-27-2011, 07:24 AM   #9
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That sounds like you spun a bearing.
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Old 07-27-2011, 08:01 AM   #10
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Yep, that sound is not a good sound. That sound is a rod bearing.
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