I got another SES code, now is P0327. Knock sensor low voltage. I understand that you have to remove the intake manifold to change this sensor. But, where is the wiring of this sensor located? It has to be outside the intake, but where? Sorry, I don't have a service manual. Please help!

Mr SE-R
'00 Camaro Z28 6spd(soon to be gone)
'93 Sentra SE-R

 

There's two sensors, actually....fore and aft. There is space under the manifold, but not much. The wires come up out of the recess where the sensors are and then they just run towards the rear of the engine and blend in to the wire harness.

TIPS!!!

When you have the manifold bolts loosened, you'll want to suspend them with zip ties so that when you slide the manifold forward the bolts won't hang up.

There is 1 electrical connect, and one SMALL vacuum connect at the rear of the manifold. Carefully slide the manifold forward (2 or 3 inches) and rotate it counter-clockwise so you can reach a hand to these connects.

The LARGE vac line to the power assist unit (brakes) needs to be removed with the manifold. Disconnect the line from the power assist unit; and feed the line at the same rate that the manifold is sliding out....WHY???....because that vac line runs behind a particularly fragile oil sensor that will snap off if you're not careful. I've had my manifold off at least three times and only had to replace that sensor the first time. It cost about $40 and the hassle so it's worth avoiding the extra work.

In my experience these knock sensors don't take kindly to water in the wires. If this sounds like a possibility in your case, you should be able to spary Wire-Dryer into the connector and into the sensor recess and blow it all out with air. I'd repeat the process a few times for good measure. I also sealed the rubber boots with silicone to prevent future water contamination. HTH

 

THANKS a lot my friend!

 

Thanks for your instructions. I have another question, you need to buy a gasket for the intake manifold?

What I will need to do this job? Parts??

Please let me know. Thanks

 

There are 8 individual ring gaskets....one for each cylinder, and I haven't replaced any of them. At some point though I'll need to upgrade my cam and at that time I'll replace them because I've been fortunate up till now, and wouldn't wanna try to buck the odds again. So to answer your question....you don't HAVE to replace them; the odds are greatly in your favor that they will seal fine if you maintain the proper torque values when you re-assemble.

I see you sent me a PM....sorry, but it wasn't available for me to retrieve it. I'll pop in from time to time and help where I can.

As far as what you'll need to do the job----all you'll need is a short 1/4 ratchet with metric sockets, needle-nose plyers, and a patient well planned order of tasks. There's no muscle work at all involved in this job, so spend your energy in the thinking process if it's new to you. DON'T force anything to fit in place or come out from where it is. The only place you'll have to exert yourself at all is where you have to feed the large vacuum hose behind the oil sensor while pulling the manifold out....this takes a little finesse.

 

Thanks again my friend!