Quote:
Originally Posted by bwood
...
I can't remember if the knock sensor for a 305 is different than the 350? ChevyTech might be able to answer that one. There are different kinds for different engines, although they may all fit in the same hole. As far as installation, it just threads into the block drain on the passenger side, nothing complicated.
|
Be careful on what you follow because there is a lot of mis-information on this issue.
It is my understanding that the knock sensor has to match the ESC module.
If you swap engines, but keep all the electrical parts with the vehicle, it will not be a problem.
That being said here is how people get into problems.
A vehicle with a 305 may, and often does, come from the factory with a different ESC module & knock sensor then the same model that has a 350 engine. This is especially true when it comes to Tuned Port Injection vehicles, such as the Camaro.
When the switch was made to electronically shift transmissions with a PCM, instead of an ECM, the ESC is built into the PCM instead of having a separate module. On those cars a PCM swap is usually done so the Knock sensor needs to be swapped to match the ESC which is in the PCM. This is where the statement that the knock sensor must be swapped originates from and people don’t realize that the model year, vehicle and the exact parts being used makes a difference in which knock sensor to use.
On some years and models the same knock sensor is used with a 305 and a 350. Other years they are different with different ESC modules.
Here is another example of why it is so important people give more complete information when asking a question. A 1993 1500 with an automatic transmission uses an 8192 BAUD rate PCM. A 1993 (and some later model year TBI trucks) with a 5 speed manual transmission used a 160 Baud rate ECM, like the older TBI trucks use, with a separate ESC module.
If someone tells you to swap the knock sensor without asking several questions, they may be wrong.
I have held my opinions to myself on this topic because I am not positive, as I have not done ALL the research on it myself, and I don’t trust anyone else’s work, but this is what I believe is true.