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....:rolleyes: I checked the OBD1 codes again...Check cam sensor and/or knock sensors:eek: 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....:thumbup2 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"....:rolleyes: I would like to keep the old Sword alive but I don't want to "pour" hundreds of dollars into a deepening HOLE...:confused: Any thoughts, experience or knowledge about engine knock solutions would be greatly appreciated...Thanks |
Is this a knock you can hear? Is it lower in the engine? You said you found metal in the oil. What's your oil pressure?
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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's of some help Thanks for the rapid reply & question(s)... |
When I get home I will post a video and you tell me if that's what yoru hearing.
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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's 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...:rolleyes: 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. |
2 Attachment(s)
Hard to hear in this video.
https://www.gmforum.com/attachment.p...ine=1311728780 This one you can really hear. https://www.gmforum.com/attachment.p...ine=1311728780 |
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...:thumbup2 |
another video attempt
Let's try this again...still having issues....:confused:
So here is a link to photo-bucket: http://s1139.photobucket.com/albums/n545/embassary2002/ Hope this is working...:cool: |
That sounds like you spun a bearing.
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Yep, that sound is not a good sound. That sound is a rod bearing.
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Ok...rod bearing
I'll start looking into that possible repair....
Thanks for the extra effort to provide your vehicle "engine knock" & to listen to mine...:thumbup2 Is this a DIY worth the time, $Money & effort for a vehicle w/ 245K miles...? |
Well...that depends on you and what it's worth to you.
If a motor goes on my Regal (which I paid $1400 for a year ago) I'd toss $250 into a JY motor, then drop it in within a day. To me that's worthwhile. I'll be putting a transmission in soon. It cost me $200 to rebuild it. If you think the car is worth $500 and the motor runs you $300.. well, it's all in how you feel about the car. |
Well, I like the vehicle & how it handles under normal driving conditions....the engine performed for such a long time...with relatively good mileage around 30 mpg highway...!!!
However, it is becoming a rust bucket...! I'll probably just part it out or schedule a trip to the bone-yard. The tires, 'CAT', radaditor & transmission will provide a few $Recycled $funds... |
X2 on putting a $300 junkyard motor if you like the car but know it has a limited lifespan due to rust.
Then while it is still running you have time to make an informed decision about what you will replace it with. Roger. |
If you have the tools you can rebuild. Pick up a short block, and about $200 in gaskets.
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Where ya getting a low cost shortblock S1 Danno? Seems that a possible longblock is much less work .
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Around here they want $650+ for a running long block, and $200-$300 for a good short block.
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Dayyyyum. Glad I don't live there.
Here at the local "whoknowswhatyourpulling" yard. A long block/whole motor is $175. You don't really know anything about it, but I've pulled a few and had great success. |
When I called around they wanted up to $1400 for a engine, plus a core charge. No thanks. I can rebuild for far less.
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