22RE detonation ping and knock sensor question
Mar 9, 2018 | 02:15 PM
#1
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22RE detonation ping and knock sensor question
New to me '92 4X4 pickup with a about 40k on a rebuilt 22RE.
When I purchased this truck in pinged BAD on my drive home. At freeway speeds I could barely roll on the throttle to accelerate without it sounding like shaking an empty spray paint can. In my efforts to reduce some of this ping, I've given it a full tune up including NGK wires, plugs, new cap and rotor etc. Didnt really help much. Ran premium fuel, helped a LOT! Checked the timing. It was a tiny bit advanced but not much. Retarded it a bit and it helped some. So my next tank I ran regular fuel and the pinging came back. Retarded the timing a degree or two more and again, pining reduced slightly but still pretty evident. Now I'm back to just running premium which... okay, whatever. I'd rather not for obvious reasons but as a last ditch effort I'm thinking knock sensor. Do these ever fail without throwing a CEL (currently no CEL and yes, it does work). I'm wondering if I have a going-bad knock sensor and if I changed it would help the pinging since it would be sending a more accurate signal to the ECU?
At this point I don't feel like retarding the timing any further would be a good solution (and yes, I know the timing procedure on these)
Thoughts?
Thanks.
When I purchased this truck in pinged BAD on my drive home. At freeway speeds I could barely roll on the throttle to accelerate without it sounding like shaking an empty spray paint can. In my efforts to reduce some of this ping, I've given it a full tune up including NGK wires, plugs, new cap and rotor etc. Didnt really help much. Ran premium fuel, helped a LOT! Checked the timing. It was a tiny bit advanced but not much. Retarded it a bit and it helped some. So my next tank I ran regular fuel and the pinging came back. Retarded the timing a degree or two more and again, pining reduced slightly but still pretty evident. Now I'm back to just running premium which... okay, whatever. I'd rather not for obvious reasons but as a last ditch effort I'm thinking knock sensor. Do these ever fail without throwing a CEL (currently no CEL and yes, it does work). I'm wondering if I have a going-bad knock sensor and if I changed it would help the pinging since it would be sending a more accurate signal to the ECU?
At this point I don't feel like retarding the timing any further would be a good solution (and yes, I know the timing procedure on these)
Thoughts?
Thanks.
Last edited by 211; Mar 9, 2018 at 02:19 PM.
Mar 9, 2018 | 02:39 PM
#2
You have to set timing per the manual, with a jumper. Otherwise you are just guessing. Next check your plugs too see if they are too hot, if so go to a colder plug. If possible get am A/F probe and see if someone monkeyed with the VAFM and leaned it out too much. Next and more involved is cam timing advanced moe than 4 degrees?
Mar 9, 2018 | 05:49 PM
#3
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Joined: Jun 2017
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From: 02176
Verify TDC on number one cylinder, THEN confirm your timing marks are truthful.
you may be advancing it too far but observing it is correct. Not sure if different balancers/timing marks can be interchanged
on 20/22R engines but they can on Chevys and this is often a problem in the hot rod world. Balancers slip on the rubber isolation ring sometimes also.
you may be advancing it too far but observing it is correct. Not sure if different balancers/timing marks can be interchanged
on 20/22R engines but they can on Chevys and this is often a problem in the hot rod world. Balancers slip on the rubber isolation ring sometimes also.
Last edited by Melrose 4r; Mar 9, 2018 at 05:50 PM.
Mar 9, 2018 | 07:11 PM
#4
You have to set timing per the manual, with a jumper. Otherwise you are just guessing. Next check your plugs too see if they are too hot, if so go to a colder plug. If possible get am A/F probe and see if someone monkeyed with the VAFM and leaned it out too much. Next and more involved is cam timing advanced moe than 4 degrees?
Mar 10, 2018 | 07:14 AM
#5
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Joined: Aug 2007
Posts: 354
Likes: 55
From: Fresno
Thoughts: Quite a few years ago, I picked-up an '89 with the 22RE. My bro had it from new. It had around 150,000 miles on it. I took it out for a road trip in central CA summer heat. Filled with "regular" gas.
Pinged terribly so 5th was essentially unuseable. Used premium thereafter, and it still would ping a bit in hot weather. I figured it had something to do with the air temp sensor, however that works on the engine
fuel control.
Last spring, one of the injectors went bad. Shop replaced all four with rebuilt injectors. When hot weather returns, we'll see; but the pinging seems to have been fixed too. Hope this helps.
Pinged terribly so 5th was essentially unuseable. Used premium thereafter, and it still would ping a bit in hot weather. I figured it had something to do with the air temp sensor, however that works on the engine
fuel control.
Last spring, one of the injectors went bad. Shop replaced all four with rebuilt injectors. When hot weather returns, we'll see; but the pinging seems to have been fixed too. Hope this helps.
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