| [GMCnet] 454 (and 455) knock sensors [message #81300] |
Wed, 21 April 2010 09:12  |
KB
Messages: 1262
Registered: September 2009
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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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1975 26'
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| Re: [GMCnet] 454 (and 455) knock sensors [message #81308 is a reply to message #81300] |
Wed, 21 April 2010 09:48  |
voodoolng
Messages: 40
Registered: February 2004
Location: Colo
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I installed a 454 in my coach. I have purchased 3 454 1 ton 454s 89-90 trk motors and they all had the ESC and knock sensor on them. Its good to have on a hot day and a GMC load. It could save your motor.
I had the howell with no knock sen. and was always listing and adjusting the timeing. With the above the ECM will cut you back and save your motor if it starts to pinging. Your call Tim
73 Glacier Voodoo lounge
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| Re: [GMCnet] 454 (and 455) knock sensors [message #81344 is a reply to message #81300] |
Wed, 21 April 2010 13:49 |
KB
Messages: 1262
Registered: September 2009
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>Tim Petras wrote:
>
> I installed a 454 in my coach. I have purchased 3 454 1 ton 454s 89-90 trk motors and they all had the ESC and knock sensor on them. Its good to have on a hot day and a GMC load. It could save your motor.
> I had the howell with no knock sen. and was always listing and adjusting the timeing. With the above the ECM will cut you back and save your motor if it starts to pinging. Your call
The few manuals I found at the library showed no knock sensors for any of the 7.4L engines, and noted it as a 5.7-only feature in some diagrams.
I have no idea which models have it and which don't or why, but clearly some do. I was told this tbi/harness did have knock sensor, so it is a real
disappointment to find it doesn't. Guess I'll have to shop around for the right E$C module. I believe it's 16131231, if anybody has one to sell.
thanks,
Karen
1973 23' Patience Tester
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Karen
1975 26'
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| Re: [GMCnet] 454 (and 455) knock sensors [message #81347 is a reply to message #81300] |
Wed, 21 April 2010 14:05 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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On Apr 21, 2010, at 8:12 AM, KB wrote:
> 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.
>
The 1989 GMC K3500 truck with a 7.4l engine used a knock sensor. It
was AC/Delco 213324.
Emery Stora
77 Kingsley
Santa Fe, NM
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| Re: [GMCnet] 454 (and 455) knock sensors [message #81394 is a reply to message #81300] |
Wed, 21 April 2010 21:30 |
KB
Messages: 1262
Registered: September 2009
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> The 1989 GMC K3500 truck with a 7.4l engine used a knock sensor. It was AC/Delco 213324.
I've got the knock sensor. It's the Electronic Spark Control Module (ESC) that I'm looking for. They ain't cheap.
I suspect this harness came from a "V" rather than "K" model. Just guessing from the lack of knock sensor and other
harness color details.
thanks,
Karen
1973 Patience Tester
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Karen
1975 26'
San Jose, CA
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