Knock Sensor, again
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Q45tech
- Moderator
- Posts: 14296
- Joined: Tue Apr 30, 2002 3:19 am
- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
Re: Knock Sensor, again (kosmo69)
Depends on his experience and which Labor Guide they use.From your taking up space on property to leaving property 5-6 hours is fair.Most shops include the profit they make on selling parts to lower the hourly labor rate.T3 adds 120% to book hours to equalize losses on customer supplied parts.
Always at RISK are vacuum, air, and other hoses which may break in the plenum removal process from old age. You are expected to pay to replace those unavoidably damaged in the process.
Always at RISK are vacuum, air, and other hoses which may break in the plenum removal process from old age. You are expected to pay to replace those unavoidably damaged in the process.
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goody90q45
- Posts: 3679
- Joined: Wed Aug 17, 2005 2:07 pm
- Car: 1992 Infiniti Q45 (sold)
- Location: Orangevale, CA
Re: Knock Sensor, again (kosmo69)
Before you throw in the towel go back a round or two and tell us how you decided you've got a bad KS. Likely scenarios are:
A) The mechanic pulled the ECU codes and one of them was the KS code. If this is the case you want to find another mechanic. The KS code purposely doesn't light up the CEL since it accompanies so many codes when an engine issue occurs. The code in these cases tells you that the KS is working properly. Or,
B) The KS resistance was measured with a digital volt meter directly at the connector, or even better on the KS pins themselves, and it showed an infinite reading or something much greater than 550k ohms resistance. If this is the case and the mechanic took the measurements then you're probably at the right shop.
Let us know which it is. You're probably going to get charged 6-8 hours labor to remove the intake to change KS but it can be done by someone with small hands (female mechanic, your proctologist) without removing the plenum, saving many labor hours. Many have done it. Do a search and print up the details to give to your mechanic and save a few bucks.
A) The mechanic pulled the ECU codes and one of them was the KS code. If this is the case you want to find another mechanic. The KS code purposely doesn't light up the CEL since it accompanies so many codes when an engine issue occurs. The code in these cases tells you that the KS is working properly. Or,
B) The KS resistance was measured with a digital volt meter directly at the connector, or even better on the KS pins themselves, and it showed an infinite reading or something much greater than 550k ohms resistance. If this is the case and the mechanic took the measurements then you're probably at the right shop.
Let us know which it is. You're probably going to get charged 6-8 hours labor to remove the intake to change KS but it can be done by someone with small hands (female mechanic, your proctologist) without removing the plenum, saving many labor hours. Many have done it. Do a search and print up the details to give to your mechanic and save a few bucks.
Re: (kosmo69)
could be coils if they have not been replaced before. all Y33 has issues with coils after 10yr/100,000mi.
007
007
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goody90q45
- Posts: 3679
- Joined: Wed Aug 17, 2005 2:07 pm
- Car: 1992 Infiniti Q45 (sold)
- Location: Orangevale, CA
Re: (miata007)
Looks like you're heading in the right direction.miata007 wrote:could be coils if they have not been replaced before. all Y33 has issues with coils after 10yr/100,000mi. 007
Re: Knock Sensor, again (kosmo69)
After delaying for a long time because 4 Infiniti techs said ' that is not the problem', I had knock sensors replaced. Before having the replacement I Kept checking the KS's, ohmed just right, but performance was not there. Only one Infiniti tech said it was the KS's.Finally replaced KS's , one of the originals were cracked, so ohming them means not much.Just do it , replace everything under plenum($850.00 from Joe) and $1200 labor. The '96Q is GREAT. JUST DO IT. You will eventually.
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Q45tech
- Moderator
- Posts: 14296
- Joined: Tue Apr 30, 2002 3:19 am
- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
Re: Knock Sensor, again (alexander)
T3 has replaced hundreds of KNOCK SENSORS and everyone had a crack in the plastic housing.
The body plastic has a finite temperature limit and temp/time curve. Think of it as a type of fuse which blows [cracks] when overheated.
It took 14 years and 220k for mine in ATL to fail some fail at 100k it is a function of underhood, under plenum, and head temperature. Number of hot vs cool down cycles per day.
Poor coolant temp mainteance will raise head temperature 10-20F and this accelerates the KS failure............................SIMPLE.
I wish every owner would get a remote temperature sensor to view the under plenum head temperature driving and after shut down especially in Summer. 250F is normal 300F is not
http://www.morganelectrocerami...4.pdf
Precise torque extends replacement KS life
The body plastic has a finite temperature limit and temp/time curve. Think of it as a type of fuse which blows [cracks] when overheated.
It took 14 years and 220k for mine in ATL to fail some fail at 100k it is a function of underhood, under plenum, and head temperature. Number of hot vs cool down cycles per day.
Poor coolant temp mainteance will raise head temperature 10-20F and this accelerates the KS failure............................SIMPLE.
I wish every owner would get a remote temperature sensor to view the under plenum head temperature driving and after shut down especially in Summer. 250F is normal 300F is not
http://www.morganelectrocerami...4.pdf
Precise torque extends replacement KS life