Question about 1996 Nissan Maxima

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EGR Flow and Knock sensor 1

I have a 1996 Nissan Maxima and been having some problems for awhile.
Usually ill start the car and go for a drive..just regular, clean driving. And out of nowhere the car's rpm will jump and so will the car and then it dies..while im driving.
I attached the computer to it and it read that i have two problems.
EGR Flow Malfunction
Knock Sensor 1 Limit Malfunction
I'd appreciate if you tell me what these are, where they are located, and what to do???
Thanks,
George

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  • Anonymous Jan 19, 2009

    same thing

  • Anonymous Feb 25, 2009

    A bad knock sensor can throw multiple ghost O2 sensor codes. Ask me how I know -.-

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Hi

The EGR valve allows a percentage of exhaust gas back into the engine during part throttle driving conditions. The exhaust gas enters the combustion process and cools the charge down slightly which lowers the emissions.

The EGR flow malfunction is usually rectified by removing the EGR valve and cleaning out the valve itself and the port(s) on the intake where it was sat, which have probably become narrowed due to all the deposits. You need to use a piece of wire to get right into the ports and clean them right out. The valve is connected to both the intake manifold and the exhaust, it is round and will have a vacuum pipe to it. It will either be mounted directly on the intake manifold, or linked to it via a hose, probably metal, and it will be linked to the exhaust via a hose, probably metal.

The knock sensor listens for engine knock, usually caused by incomplete combustion or over advanced ignition timing, and retards the ignition timing to counteract the knock.

You very highly likely have a faulty sensor, but check the wiring first. To suss the problem properly you would need to have alive scan carried out.

Knock sensors are usually located under the intake manifold on these cars and are a complete pain to get to. You'll probably need a universal joint type of affair to get it off. They held on with one bolt.

Very best regards

Geordie

Posted on Jun 14, 2008

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I have a 1996 maxima that first showed trouble code nock sensor and 02 senor after cat .replaced both clear the codes two days later check eng light comes back on and there is multi codes PO130, PO150, PO325,PO400, P1445 MY QUESTION IS WOULD THE EGR BLOCKAGE CAUSE ALL THE CODES TO COME UP .or what else would be the cause. thanks paul

Posted on Jun 28, 2008

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Technical Description

Knock Sensor Circuit Malfunction
What does that mean?

A knock sensor tells the engine computer when one or more of your engine's cylinders are "knocking", that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged. The computer uses this information to tune the engine so that it doesn't knock. If your knock sensor wasn't operating properly, so that it was always indicating a knock, the engine computer's response may have been to change the ignition timing on your engine. Knock sensors generally bolt into or thread into the engine block. This P0325 code may show up intermittently or the Service Engine light may be lit constantly. Other knock sensor related DTC codes include P0330.
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook Symptoms

You may notice drivability problems including a lack of power and perhaps some hesitation. There may also be other symptoms.
Causes

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Possible Solutions
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Sources: W. Farmer - Nissan


P0400 - Exhaust Gas Recirculation Flow Malfunction OBD-II Trouble Code Technical Description

Exhaust Gas Recirculation Flow Malfunction
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The exhaust gas recirculation (EGR) valve is vacuum controlled valve that regulates the amount of exhaust gases that re-enter the cylinders. The powertrain control module (PCM) determines how much based on engine load, temp, and other conditions. If the PCM detects that the amount of exhaust gases entering the cylinder were insufficient or non-existent, this code is set.
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook Symptoms

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A code P0400 may mean that one or more of the following has happened:

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Since EGR valve designs are different, no one test will suffice:

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