Knock Codes
Thread Starter
Cruising
Joined: Jan 2020
Posts: 13
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Knock Codes
dr8531 , Today 02:22 PM
I had to change out the oil send unit so I went ahead and replace MAP, Camshaft sensor, knocks with harness. After job was complete after driving 30-40 miles check light came on, was both knock sensors. I did replace everything with acdelco except knock material, so I ordered all new again but got acdelco and reinstalled, torqued to 20nm and ran harness straight back with fatest part of harness at manifold. Again both knock codes once again, timing of code pulling is all over the place.
I had no codes prior to initial replacement.
Any ideas on what would cause this?
I did break that cheap plastic evap tube from the firewall to the canister, replaced with fuel hose and hose clamps
I had to change out the oil send unit so I went ahead and replace MAP, Camshaft sensor, knocks with harness. After job was complete after driving 30-40 miles check light came on, was both knock sensors. I did replace everything with acdelco except knock material, so I ordered all new again but got acdelco and reinstalled, torqued to 20nm and ran harness straight back with fatest part of harness at manifold. Again both knock codes once again, timing of code pulling is all over the place.
I had no codes prior to initial replacement.
Any ideas on what would cause this?
I did break that cheap plastic evap tube from the firewall to the canister, replaced with fuel hose and hose clamps
Thread Starter
Cruising
Joined: Jan 2020
Posts: 13
Likes: 0
I found the issue, when I removed old ones pieces broke off and I vacuumed the sensor holes but did not look in there assuming I got everything. There was a large piece on there that I found after taking intake off again. But she has not thrown code in past 2 days so I think I am in the clear!
Drifting
Joined: May 2008
Posts: 1,692
Likes: 490
From: Denver, NC
I found the issue, when I removed old ones pieces broke off and I vacuumed the sensor holes but did not look in there assuming I got everything. There was a large piece on there that I found after taking intake off again. But she has not thrown code in past 2 days so I think I am in the clear!
You did not over torque them, but it sounds like you tightened them against something that was not supposed to be in there which would have had the same effect. This was an interesting read and thanks for posting the result.
