Engine Replace time.../ ?? Parts
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Starting Member
Joined: Jun 2016
Posts: 206
From: LAS VEGAS, NV
Ok thanks
(I just edited post I found one more)
the 01 is 600 bucks
the 99 is 500 bucks
I wish I had enough money to do that crate engine but would take me another
2 months to save that much up.
(I just edited post I found one more)
the 01 is 600 bucks
the 99 is 500 bucks
I wish I had enough money to do that crate engine but would take me another
2 months to save that much up.
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Joined: Oct 2014
Posts: 4,336
From: North Central Indiana
The engine blocks are machined differently for the mounting of this sensor, and wiring harness in your vehicle is different depending on which sensor it has originally. You should go with engine that has the same sensor as your vehicle does now. 1999 should have a 1-wire knock sensor.
1-wire knock sensor
2-wire knock sensor
1-wire knock sensor
2-wire knock sensor
Last edited by LesMyer; Jan 30, 2017 at 07:54 PM.
Thread Starter
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Starting Member
Joined: Jun 2016
Posts: 206
From: LAS VEGAS, NV
The engine blocks are machined differently for the mounting of this sensor, and wiring harness in your vehicle is different depending on which sensor it has originally. You should go with engine that has the same sensor as your vehicle does now. 1999 should have a 1-wire knock sensor.
If the 99 is a larger thread
and the 2001 is a smaller thread
Couldn't I just tap the 2001 sensor hole to the size
of 99 thread size of the knock sensor and use my existing
setup ?
Or tap a hole next to it if reversed ?
Last edited by cdtek101; Jan 30, 2017 at 08:31 PM.
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Starting Member
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From: LAS VEGAS, NV
I got the build date 11/04/2000 on the 2001 Blazer
The build sheet shows on his vs mine:
2001 Blazer -L35 ENGINE,4.3L(4.3W),CPI,V6,90 DEG 4.3W(L35)
vs
1999 Blazer -L35 ENGINE,4.3L(4.3W),CPI,V6,90 DEG 4.3W(L35)
The build sheet shows on his vs mine:
2001 Blazer -L35 ENGINE,4.3L(4.3W),CPI,V6,90 DEG 4.3W(L35)
vs
1999 Blazer -L35 ENGINE,4.3L(4.3W),CPI,V6,90 DEG 4.3W(L35)
Moderator
Joined: Oct 2014
Posts: 4,336
From: North Central Indiana
Hmmm,, Is there a difference in bolt size on these ??
If the 99 is a larger thread
and the 2001 is a smaller thread
Couldn't I just tap the 2001 sensor hole to the size
of 99 thread size of the knock sensor and use my existing
setup ?
Or tap a hole next to it if reversed ?
If the 99 is a larger thread
and the 2001 is a smaller thread
Couldn't I just tap the 2001 sensor hole to the size
of 99 thread size of the knock sensor and use my existing
setup ?
Or tap a hole next to it if reversed ?
Thread Starter
|
Starting Member
Joined: Jun 2016
Posts: 206
From: LAS VEGAS, NV
I sure hope so i want this 2001 so bad I can taste it, there is got to be way to do it.
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Joined: Oct 2014
Posts: 4,336
From: North Central Indiana
11month of 2000 is fairly early. Maybe it will be the old style sensor. ONly one way to know.
Thread Starter
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Starting Member
Joined: Jun 2016
Posts: 206
From: LAS VEGAS, NV
I am google reading everything to see if
it's been changed back otherwise
Thread Starter
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Starting Member
Joined: Jun 2016
Posts: 206
From: LAS VEGAS, NV
Looks like 99 has bigger bolt diameter so just have to Drill & Tap
2001 knock sensor hole to fit larger 99 sensor...
( if not same size 1 wire )
.. and swap oil pans ...like Lesmyer said.
Found this info so far from searching;
Our forum:
....other forum posts:...
You cannot substitute a 2 wire sensor for a single wire sensor. Their outputs are different from what I have read up on them. You will have to find a way to drill/tap the hole out to the appropriate NPT tap size (can't remember off the top of my head).
The two wire knock sensor is not compatible with the 99 PCM.
the one and two wire sensors produce entirely different waveforms.
the 99 PCM can't process the signals from a 2wire KS.
>The usual method to install a one wire sensor on an 01- up
4.3L is to drill and tap the hole in the block for a (I think)
1/4-18 NPT.
if the engine is already in the truck, doing this in the stock KS
location would be just about impossible. just relocate the sensor
to either one of the block drain plug holes, or the holes in the side
of the cylinder heads, which are already the correct thread size.
the 01 has 2 wires on the pcm that senses voltage and the 00 just has 1 wire and it is grounded through the sensor. So if you ground one wire on the 01 engine and run one wire you should be fine. Connect the dark blue wire and ground the grey wire.
2001 knock sensor hole to fit larger 99 sensor...
( if not same size 1 wire )
.. and swap oil pans ...like Lesmyer said.
Found this info so far from searching;
Our forum:
1st Post-
You cannot substitute a 2 wire sensor for a single wire sensor. Their outputs are different from what I have read up on them. You will have to find a way to drill/tap the hole out to the appropriate NPT tap size (can't remember off the top of my head).
...2 nd post ;
You have a few options.
#1 - Drill and tap the block to fit the 1/4" NPT threads on the bottom of the one wire knock sensor. This would physically convert your block to the older style.
#2 - Fab a mounting adapter that will bolt to the block using a socket head cap screw that will use the existing hole in the block and have the proper 1/4" NPT thread for the stock sensor. This may be result in the KS sitting up too high off the bellhousing, competing for space with the other items at the back of the block.
#3 - Get the connector for the 2-wire sensor, ground the gray wire, and splice the dark blue wire.
You cannot substitute a 2 wire sensor for a single wire sensor. Their outputs are different from what I have read up on them. You will have to find a way to drill/tap the hole out to the appropriate NPT tap size (can't remember off the top of my head).
...2 nd post ;
You have a few options.
#1 - Drill and tap the block to fit the 1/4" NPT threads on the bottom of the one wire knock sensor. This would physically convert your block to the older style.
#2 - Fab a mounting adapter that will bolt to the block using a socket head cap screw that will use the existing hole in the block and have the proper 1/4" NPT thread for the stock sensor. This may be result in the KS sitting up too high off the bellhousing, competing for space with the other items at the back of the block.
#3 - Get the connector for the 2-wire sensor, ground the gray wire, and splice the dark blue wire.
You cannot substitute a 2 wire sensor for a single wire sensor. Their outputs are different from what I have read up on them. You will have to find a way to drill/tap the hole out to the appropriate NPT tap size (can't remember off the top of my head).
The two wire knock sensor is not compatible with the 99 PCM.
the one and two wire sensors produce entirely different waveforms.
the 99 PCM can't process the signals from a 2wire KS.
>The usual method to install a one wire sensor on an 01- up
4.3L is to drill and tap the hole in the block for a (I think)
1/4-18 NPT.
if the engine is already in the truck, doing this in the stock KS
location would be just about impossible. just relocate the sensor
to either one of the block drain plug holes, or the holes in the side
of the cylinder heads, which are already the correct thread size.
the 01 has 2 wires on the pcm that senses voltage and the 00 just has 1 wire and it is grounded through the sensor. So if you ground one wire on the 01 engine and run one wire you should be fine. Connect the dark blue wire and ground the grey wire.
Last edited by cdtek101; Jan 31, 2017 at 01:21 AM.