| [GMCnet] 454 (and 455) knock sensors [message #81300] |
Wed, 21 April 2010 09:12  |
KB
Messages: 1262
Registered: September 2009
Karma:
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Senior Member |
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I've been going through the TBI wiring harness I got recently, that I'm told came from a 1989 Chevy Silverado 3500.
After much searching, I've determined there is no knock sensor on it. If I can believe the online parts searches,
there was an ESC module made for 7.4 liter engines (to drive the knock sensor), but it's rare and expensive.
Searching through assorted manuals, I find that most if not all 7.4 liter trucks of that era didn't have knock sensors,
though 5.7 liter ones did.
I'm trying to figure out if it's worth adding one in. I believe the ECM (7747) can support it if I add the pin, wiring, ESC module, etc.
So, my question: why did GM put knock sensors on 5.7 liter engines, but not the 7.4??
Perplexed,
Karen
1973 23' Patience Tester
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Karen
1975 26'
San Jose, CA
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