Steve or NissTech EGR&Knock sensor problems

Oh, I may not be here to get the answer, as I am in the strike zone for Francis.....may have to RUN! If I do I'll be in Atlanta, I may come buy ans see your shop Steve....where are you located? Didn't you say your around Conyers??? I'll have my 97 Max with me and would like to get you to look at it. (The 96 SE is my daughters) Thanks Bitsbucket

manifold....I

The knock sensor CEL is often tripped by other sensors. A bad knock sensor is also not a problem in the short term, expensive to replace. So it's a good idea to trace/solve the other CEL (EGR in your case) and wait to see if the Knock sensor throws codes on its own, later.

manifold....I

I don't have my FSM with me, so my best suggestion is groups.google.com and maxima.org to see if it's been covered before.

Dave

im in the path too bits.

I'll get back to ya on this one

I will be boarding up tomorrow

manifold....I

FWIW, I know three people (including myself) who have had bad knock sensors on this generation of Maximas. Seems to have a limited lifespan.

For future reference, I was able to replace the sensor without removing the intake manifold by using the right combination of ratchet extensions and universal joints.

Nope probably has both problems, the knock sensor doesn't set the CEL.

The CEL is being caused by the EGR, probably a clogged intake passage.

It's not the valve itself, it's the passge in the intake.

Not really, that's the only problem I've seen so far though.

No.

BTW the knock sensor might just need the connections cleaned.

Nope, in scottdale, near decatur area. See the map at our website.

So Nissan decided to have the computer NOT throw a CEL for a knock sensor, but it will throw a CEL for a EGR? In other words I could have been driving around with a bad knock sensor, not see a CEL and then when the EGR valve had a problem, it threw a code and I saw both codes, with my Digimoto computer analyzer, but it was initially set by the EGR valve?

So, I need to check the problems as independent problems, not as a combination problem?

If the passages are clogged, the upper manifold MUST be removed to clean? Do I have to remove the lower intake manifold?

What is the MOST common problem? Clogged passages, or a problem with the EGR valve itself?

Knock sensor is expensive, other than the check in the manual is there anything else I can do?

Thanks John

Exactly. The knock sensor isn't an emmisions control device.

Yep.

Yep. It's not -that- hard to do it. You have to clean out the pipe going to it as well.

No.

I've never seen a valve bad and cleaned dozens of upper intakes and pipes.

Again clean the connectors on the sensor and install a new plug on the end of the harness and see if it resets the code for it. If it does, the sensor is dead. BTW this causes the timing to default to the retarded position and causes a loss of performance and MPG.

it's not going to be something most people would notice. It just operates in "regular gas" mode all the time. Many people are too cheap to buy good gas so it might not matter?