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3800sc bad tap noise by pontiacfierokid1985
Started on: 11-14-2020 11:10 PM
Replies: 2 (71 views)
Last post by: Dennis LaGrua on 11-15-2020 03:19 PM
pontiacfierokid1985
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Ok so 3800sc out of a 1997 riviera I finally finished the install and got it running I did a test drive with it the other night stock open manifold out the trunk to see how it would go and now all the sudden I have this what could this be. I got the motor from a bone yard which showed 150k on the odometer. Heard it run didn’t make any tapping but now it sounds like it’s top end knock
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coolink13
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Report this Post11-15-2020 10:00 AM Click Here to See the Profile for coolink13Click Here to Email coolink13Send a Private Message to coolink13Edit/Delete MessageReply w/QuoteDirect Link to This Post
Sorry to hear about the knock. you could drain the oil and check for metal or silver colored oil to start with. Next pull the valve covers for inspection and see what you find?? I was going to look at a 1998 buick 3800 super charged with 157K . I lost out on it. but I was going to rebuild it. Hope this helps
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Dennis LaGrua
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Report this Post11-15-2020 03:19 PM Click Here to See the Profile for Dennis LaGruaClick Here to Email Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post
Get yourself 2 1/2' of 1/2"or 3/4" hose and a large funnel. Using duct tape fasten the hose to the funnel. Now start the engine and use the hose as a stethoscope, the funnel being the ear piece end. Probe around and you will locate the noise.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
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