3800 Series III Knock Sensor Location
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- čas přidán 8. 09. 2024
- Hello viewers,
This video is a request video made from one of my subscribers.
note this is not a repair video. Just on the location of the sensor
The 3800 Series III engine is considered a robust engine that is easy to work on. But some things are not so easy. The Knock Sensors are one of those things.
Technically, that is only half true. The front knock sensor (which is what this video is requested for and based on) is fairly easy. The rear knock sensor is a different story
This video shows the location of the front sensor, and discusses, but does not show, the rear.
This was done on a 2005 Pontiac Grand Prix. Should cover all 3800 Series III engines, including
2004 2005 2006 2007 2008 Pontiac Grand Prix
05 06 07 08 09 Buick Lacrosse and Allure
2006-2008 Buick Lacrosse
Disclaimer
I assume no liability for property or vehicular damage or injury incurred as a result of any of the information contained in this video. I recommend safe practices when working with any and all tools, including but not limited to electrical tools, power tools, pneumatic tools, any lifting apparatus, including jacks, jack stands, and automotive lifts, manual tools, chemicals, lubricants, and any other instruments used within the video. Due to factors beyond my control, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of all above mentioned tools or equipment, or any other items mentioned above, and all information contained in this video is the sole responsibility of the user and not myself or Nexus Auto. Caution is advised and any practices by the viewer is at user discretion. Any tool or part recommendations or links are given for informational purposes only and it should be assumed to be bought at your own risk. I or Nexus Auto assumes no liability for any damages, premature part failures, or incorrect parts made from purchases made online, including but not limited to tools, parts, instruments, jacks, chemicals, lubricants, etc.
Thanks for sharing this story. Getting tired of not being able to translate the audio or see what there’re pointing the camera at. Good job!
No problem at all! Happy to hear the video was enjoyable! Thanks for watching, it's much appreciated!
Gracias Dois Mio por tus bendiciones y todo que me das y por cada dia que me das Amen ❤
Yesssiiirrrr appreciate it a ton!! Now let me watch and see where its at!
No problem at all. Hope it helps out. Let me know.
At 300k miles first owner this is the first time having issues with the knock sensor
Wow! Happy to see your GP is still going (knock sensor aside). Hope it's the front one and not the back
@@NexusAuto pretty sure it’s rear I’ll see what I can do. Have rebuilt the trans twice in the car without dropping it so hopefully I can figure it out without dropping it for this
@@r2c479 oh nice. Hopefully you figure a workaround on it Let me know how it goes
Guess I'm the lucky one. I have this exact engine in my 05 grand prix and what do you know it just through an error code p0332 (The rear knock sensor) 😳 any suggestions on the best coarse of action? You have one of the only videos on CZcams that even shows you the location of the 2 sensors. Any advice you might be able to give I would be grateful. Very informative video, subbed immediately 👍
Oh no...I feel for you.
unfortunately, I do not have direct experience wit the rear knock sensor, so I have no personal tips. I have discussed with other GP friends in the past, and it is a terrible job to do. Sorry, have to be honest.
Technically speaking, the service manual says you need to actually disconnect and separate the transmission from the engine to do this, as it is directly in the way! I know, crazy.
From those I talked to, the let me know it can be done without that, but it takes an EXTREME amount of patience. You have to go in with a wrench, and ever so slowly, in essentially 1/16th turns, move it bit by bit until it moves freely enough to just get 2 fingers in there to spin it the rest of the way.
Here are 3 very important tips the I heard as well
-Although the slow turns are tedious, the first hardest part is getting the leverage to get it turning to begin with. Once it is 'broken' free, it will likely spin, just takes a long time
-Many wrenches do not fit, nor does a ratchet. Some have let me know they had to grind down a wrench to fit. But not everyone had this issue. I guess this depends on the wrench manufacturer and size.
-Last, and most crucial, knock sensors need to be torqued correctly. If it is slightly too lose or tight, it will get the ECM a false reading and it may still think it is defective, when in fact it could be a difference of a few ft lbs. Some guess as they tighten, some did trial and error.
I know this info makes it sound like a giant Pain in the ass, and it is, but it can be done.
Hope this helps give some insights. Thanks for the sub too, I very much appreciate it!
@nexus auto have you ever seen or heard of both knock sensors going out at the same time?
I have, but it is extremely rare. Normally there is some other underlying reason. I have seen it happen though.
What about the ac pressure switch where's that located. And what's the symptoms of bad knock senor
A bad knock sensor is going to cause the engine to be unable to regulate unusual knocks from combustion, and the ECU can become confused. It can throw off the timing of combustion, and in extreme situations, can cause very poor combustion. This can lead to carbon build up, poor intake temps, bad fuel economy, a loud tick from the engine,and more. They don't go often, but they are problematic if they go.
I'll take a look into making a video on the pressure switch location as well. Keep an eye out.
Where is the location of the fuel filter ? I have to change mine, I have a 08 Grand Prix base
That is some unfortunate news. In mid 2005, GM moved the fuel filter from its own part sitting just underneath the driver side door, on the underbody of the car, to an all in one unit as part of the fuel pump. There is no standalone fuel filter anymore. If you need it changed, you have to change the whole fuel pump assembly, which is inside the gas tank
@@NexusAuto thanks man I was so confused! And that’s very unfortunate, but thanks for making videos I learned a lot from you!
@@Angel-e85 No problem at all. I am glad to hear these video helped out. That's awesome news.
I have an 08 randprix 175 k miles. been a great car so far as long as i can keep the field rats from chewing on my wires..grrr i have the PO332 code for rear bank 2 knock sensor mechanically the car runs good
another code that pulls up with it is P2430 secondary air injection sensor pressure circuit. Te guy at autozone said he wouldn't worry about it as long as the engine runs good. he said it mainly for emission control. I live in Oklahoma so we don't have emission testing requirements It look like it would be a real pain in th butt to change out. have you done any videos on this code? for the 3800 series three engine. thanks for your reply and Happy Thanksiving everybody!!
I haven't done a video on these codes, but I can confirm the rear knock sensor is one of the hardest things to work on at home. It is in a terrible spot. Your autozone guy is right...it is really only for emissions. However, it should be noted that if the knock sensor does give a far off enough reading, it can actually cause the car to run really rough, as the car will get confused on how much air/fuel ratio it needs. Officially, I always say to repair any fault. Unofficially, if the car is running with no issues, you're ok. If the car still running rough, it may be a primary cause.
@@NexusAuto thanks for the reply. I did check with my local repair shop today he said the labor guide calls for 7 hours repair and dropping the transmission to get to it to replace it. The sensor is about $57. so I am not going to do it for the time being since my car seems to be running ok- same with my smog pump code $700 quote to replace it so I am skipping that repair LOl. glad we have no emissions test requirements in Oklahoma :) if Joe Biden wants to send me a personal check to repair both issues have him reach out to me here LOl
@@okjeepguy5179 LOL If Biden confirms the checks are going on, I'll definitely let you know!
Sounds good on your car. Just keep a casual eye on the car, but as long as it's running ok, you should be good to go
Does the knock sensor prevent the transmission to go into gear.
@@jimmynaughton8675 it can definitely affect the transmission. I'm not sure if it will go far enough to prevent it from going into gear...I've never heard of that personally. But a bad sensor can definitely make the transmission shift hard and erratically. So I guess it may be possible.
@NexusAuto ok thank you. I need to find a way to get down to Bangor from caribou to pick up a parts car that is a grand prix also.
@NexusAuto if I get the sensors fixed I will definitely let you know if it goes back into gear or not.
@jimmynaughton8675 if you can get that parts car over, that would be awesome!
@@jimmynaughton8675 sounds good..let me know how it goes
I have a bad one on the back side can I do it myself???
Can it be done? Yeah. But it is giant pain! You will need a ton of patience to get it done, and some creativity. Unfortunately, it is mounted in a small spot a the back of the engine, and the transmission is mounted right up beside it.
I kid you not...in the service manual, it says you have to remove the transmission to do it.
There some discussions on the web on how it can be done without doing that, but I have yet to do it myself. This is why I did not film it at the time of this video.
Unfortunately, the forums are not very descriptive, but they do give some tips and shows it can be done. If this sounds too much of a hassle, definitely get it done at a technician, but it will not be cheap.
Hi
I have a 06 grand prix gt supercharged
120k
It has a very random p0300
I changed the plugs and wires at 80k
Should I do them again
Or just get it scanned at a dealer to know for sure
It runs like brand new
Zero missing at full or half
Sometimes it idels chunky
I would say to get it scanned. There is no good reason why your plugs and wires are bad after 40k of use. It is possible for sure, but unlikely. It could be anything from the knock sensor in this video, to intake manifold gasket leak (a common issue on this code), bad coil, etc. The chunky idle is probably from this random intermittent p0300. If it were me, I would be scanning first.
@@NexusAuto it only has 120kms and was my dad's car who gave it to my mom
I'm told her if it comes back to take it to dealer and get it scanned
Ty tho
@@benkalinowski5834 No problem at all. That is amazing mileage for an 06 car! Lots of life left. Hopefully the issue gets found, or goes away completely on its own lol.
Which bank are you focused on in this video? Bank 1 or bank 2?
This is bank 1, before the cat. Bank 2 is significantly harder to get to, and is located at the rear, near the transmission
@@NexusAuto is it possible for you to show it ?
@@ozziemathis4400 I can, but not at this, as my GP is currently parked. But I'll bring it out soon once winter is up, so I can look at filming it then
@@NexusAuto currently working on my Monte since it has the same issue I ended up finding but having a problem getting to it gonna try with a 3/8th 21”-22” and see if that works
@@ozziemathis4400 Hopefully it all works out ok for you! It is very tricky to do. Let me know how it goes
U can't replace ?
@@user-oj8xk6kz2u it can be replaced. The front one is easier than the rear one. I didn't replace mine as it's working fine
Is that the lower bank 1
Yep, this shows Bank 1 directly. Bank 2 is located at the rear of the engine, in the same general area at the rear, which is near the transmission