i' ready to knock my truck out

1bads-10 · 06-14-2009, 04:31 PM

i have a 1993 chevy s-10 blazer 4.3l W engine.it has two knock sensors one on the driver side(in the head)and the 2nd one is on the passager side near the back of the engine,in the head. my ? is this i don't really have alot of money and to replace the knock sensor is 35 to 45 bucks.can i bypass the far passager side knock senors or do i have to buy one.i have been to a few junk yards but these vortec 4.3 are hard to find,and the Z engine does not have two knock sensor.so what can i do.

**wrench97** · 06-14-2009, 04:48 PM

The sensor is less then $30 not really worth pounding around the junk yards for.
http://www.autozone.com/autozone/cat...ll&totalPages=[I@1339749&currentPage=1&vehicleNValue=&navValue=15900126&parentId=cat30067&fromString=&fromWhere=null&filterByKeyWord=&categoryNValue=&categoryDisplayName=Engine+Management&_requestid=1315320

**wrench97** · 06-14-2009, 04:49 PM

The sensor is less then $30 not really worth pounding around the junk yards for.
http://www.autozone.com/autozone/cat...uestid=1315725

1bads-10 · 06-14-2009, 04:52 PM

i forgot,also with this sensor not in use my from breaks are dragging.will this also be the cause

**wrench97** · 06-14-2009, 05:01 PM

No the knock sensor should have nothing to do with the brakes check the hoses and calipers, The brake hoses can fail internally causing fluid pressure to remain on the caliper, and the calipers can get rusty and pistons hang not returning.

1bads-10 · 06-14-2009, 05:04 PM

thanks,so theirs noway to bypass that knock senor?

**wrench97** · 06-14-2009, 05:25 PM

No it will set the check engine light and put the ECM into open loop just like it is now without that input the ECM won't get the timing or air/fuel ratio set correctly leading to poor fuel mileage(rich) or burnt pistons(lean).

**Raylo** · 06-14-2009, 06:46 PM

Beware... these things are not that easy to change. It has flats like a nut but that is onlky attached to the innards and when you go to try to turn it most likely the internals will break loose from the housing. On mine the knock sensor body was basically welded into the motor with what looked like red thread locker. So the innards just spun around without actually getting the whole sensor to turn. I ended up having to remove a lot of interference and then get some vise grips on it and use a torch to heat up the head around it. I left a thread on this over at S10forums. I'll see if I can find it and link it here.

Here is the thread from when I had to pull my drivers side KS. There are a few pics in there that might be of interest. What a PITA!

http://www.s10forum.com/forum/f107/i...-break-358670/

1bads-10 · 06-16-2009, 12:08 PM

Quote:

Originally Posted by Raylo

Beware... these things are not that easy to change. It has flats like a nut but that is onlky attached to the innards and when you go to try to turn it most likely the internals will break loose from the housing. On mine the knock sensor body was basically welded into the motor with what looked like red thread locker. So the innards just spun around without actually getting the whole sensor to turn. I ended up having to remove a lot of interference and then get some vise grips on it and use a torch to heat up the head around it. I left a thread on this over at S10forums. I'll see if I can find it and link it here.

Here is the thread from when I had to pull my drivers side KS. There are a few pics in there that might be of interest. What a PITA!

http://www.s10forum.com/forum/f107/i...-break-358670/

i was having problems with the rear knock sensor and i replace it,but now i went to fire it up to clear the codes and this thig won't turn over,i also notice that whenever i would touch or move the oil pressure senor on the rear of the engine it would turn on&off the fuel pump,whats up with that?

**wrench97** · 06-16-2009, 12:15 PM

Sounds like a loose wire, connector or the sensor is bad does it appear to be leaking oil?

1bads-10 · 06-16-2009, 12:39 PM

Quote:

Originally Posted by wrench97

Sounds like a loose wire, connector or the sensor is bad does it appear to be leaking oil?

no,but the plug itself is broken.why would it turn the fuel pump on&off?

**wrench97** · 06-16-2009, 02:05 PM

The electric fuel pump is hooked through the oil switch so that if the engine isn't running and loses oil pressure it shuts the fuel pump down.

1bads-10 · 06-16-2009, 02:17 PM

so if the oil pressure sensor is unpluged it shuts the pump off?

**wrench97** · 06-16-2009, 02:41 PM

Yes it will

1bads-10 · 06-17-2009, 04:14 AM

thanks brother,i'm off to school here in an hour to fix my truck.thanks you have been a big help.

06-14-2009, 04:31 PM	#1 (permalink)
1bads-10 Registered User Join Date: Jun 2009 Posts: 7 OS: vista	i' ready to knock my truck out i have a 1993 chevy s-10 blazer 4.3l W engine.it has two knock sensors one on the driver side(in the head)and the 2nd one is on the passager side near the back of the engine,in the head. my ? is this i don't really have alot of money and to replace the knock sensor is 35 to 45 bucks.can i bypass the far passager side knock senors or do i have to buy one.i have been to a few junk yards but these vortec 4.3 are hard to find,and the Z engine does not have two knock sensor.so what can i do.

06-14-2009, 04:48 PM	#2 (permalink)
wrench97 Moderator, Hardware Team Join Date: May 2008 Location: S.E. Pennsylvania Posts: 17,919 OS: Win7	Re: i' ready to knock my truck out The sensor is less then $30 not really worth pounding around the junk yards for. http://www.autozone.com/autozone/cat...ll&totalPages=[I@1339749&currentPage=1&vehicleNValue=&navValue=15900126&parentId=cat30067&fromString=&fromWhere=null&filterByKeyWord=&categoryNValue=&categoryDisplayName=Engine+Management&_requestid=1315320 __________________ Power Supply and Selection

06-14-2009, 04:49 PM	#3 (permalink)
wrench97 Moderator, Hardware Team Join Date: May 2008 Location: S.E. Pennsylvania Posts: 17,919 OS: Win7	Re: i' ready to knock my truck out The sensor is less then $30 not really worth pounding around the junk yards for. http://www.autozone.com/autozone/cat...uestid=1315725 __________________ Power Supply and Selection Last edited by wrench97; 06-14-2009 at 04:50 PM.

06-14-2009, 04:52 PM	#4 (permalink)
1bads-10 Registered User Join Date: Jun 2009 Posts: 7 OS: vista	Re: i' ready to knock my truck out i forgot,also with this sensor not in use my from breaks are dragging.will this also be the cause

06-14-2009, 05:01 PM	#5 (permalink)
wrench97 Moderator, Hardware Team Join Date: May 2008 Location: S.E. Pennsylvania Posts: 17,919 OS: Win7	Re: i' ready to knock my truck out No the knock sensor should have nothing to do with the brakes check the hoses and calipers, The brake hoses can fail internally causing fluid pressure to remain on the caliper, and the calipers can get rusty and pistons hang not returning. __________________ Power Supply and Selection

06-14-2009, 05:04 PM	#6 (permalink)
1bads-10 Registered User Join Date: Jun 2009 Posts: 7 OS: vista	Re: i' ready to knock my truck out thanks,so theirs noway to bypass that knock senor?

06-14-2009, 05:25 PM	#7 (permalink)
wrench97 Moderator, Hardware Team Join Date: May 2008 Location: S.E. Pennsylvania Posts: 17,919 OS: Win7	Re: i' ready to knock my truck out No it will set the check engine light and put the ECM into open loop just like it is now without that input the ECM won't get the timing or air/fuel ratio set correctly leading to poor fuel mileage(rich) or burnt pistons(lean). __________________ Power Supply and Selection

06-14-2009, 06:46 PM	#8 (permalink)
Raylo TSF Enthusiast Join Date: Feb 2006 Location: Maryland, USA Posts: 521 OS: XP Desktop, Vista HP Notebook, XP Notebook	Re: i' ready to knock my truck out Beware... these things are not that easy to change. It has flats like a nut but that is onlky attached to the innards and when you go to try to turn it most likely the internals will break loose from the housing. On mine the knock sensor body was basically welded into the motor with what looked like red thread locker. So the innards just spun around without actually getting the whole sensor to turn. I ended up having to remove a lot of interference and then get some vise grips on it and use a torch to heat up the head around it. I left a thread on this over at S10forums. I'll see if I can find it and link it here. Here is the thread from when I had to pull my drivers side KS. There are a few pics in there that might be of interest. What a PITA! http://www.s10forum.com/forum/f107/i...-break-358670/ Last edited by Raylo; 06-14-2009 at 06:59 PM.

06-16-2009, 12:15 PM	#10 (permalink)
wrench97 Moderator, Hardware Team Join Date: May 2008 Location: S.E. Pennsylvania Posts: 17,919 OS: Win7	Re: i' ready to knock my truck out Sounds like a loose wire, connector or the sensor is bad does it appear to be leaking oil? __________________ Power Supply and Selection

06-16-2009, 02:05 PM	#12 (permalink)
wrench97 Moderator, Hardware Team Join Date: May 2008 Location: S.E. Pennsylvania Posts: 17,919 OS: Win7	Re: i' ready to knock my truck out The electric fuel pump is hooked through the oil switch so that if the engine isn't running and loses oil pressure it shuts the fuel pump down. __________________ Power Supply and Selection

06-16-2009, 02:17 PM	#13 (permalink)
1bads-10 Registered User Join Date: Jun 2009 Posts: 7 OS: vista	Re: i' ready to knock my truck out so if the oil pressure sensor is unpluged it shuts the pump off? Last edited by 1bads-10; 06-16-2009 at 02:20 PM.

06-16-2009, 02:41 PM	#14 (permalink)
wrench97 Moderator, Hardware Team Join Date: May 2008 Location: S.E. Pennsylvania Posts: 17,919 OS: Win7	Re: i' ready to knock my truck out Yes it will __________________ Power Supply and Selection

06-17-2009, 04:14 AM	#15 (permalink)
1bads-10 Registered User Join Date: Jun 2009 Posts: 7 OS: vista	Re: i' ready to knock my truck out thanks brother,i'm off to school here in an hour to fix my truck.thanks you have been a big help.