My check engine light is on and I need to get it off to get an emissions sticker. Auto Zone ran a scan on it and said it was egr valve and knock sensor malfunction. So I replaced both and had the codes cleared out and the light came back on with the same codes. The car runs great but on occasion it does idle a little funny like it would have vaccum leak. I sprayed carb cleaner everywhere that it would be vaccum and listened with hose. I can't find anything. Any feedback or a point in right direction would be greatly appreciated.
SOURCE: P0440 Evaporative Emission Control
You need a charcoal canister and vent control valve.
You also need the EGR solenoid valve (I think it the brown one).
Valve is located in the valley of the V, towards the transmission side of engine.
Do these 1st and reset light. You may have other issues but you have to start here.
SOURCE: no vacuum to egr valve
there is an EGR vacuum solenoid somwhere that controls on/off vacuum to actuate the valve. i am not to sure of the location, but follow the vacuum line back from the egr until you find a device that looks like an electrical check valve for vacuum. that is a possibilty. but then again i am a ford,chrysler guy and am just giving you an answer based on my understanding of the functuality of a vacuum egr system
SOURCE: 1997 Nissan Altima with idle jump
The description sounds like a technical Service Bulletin Nissan came out with on your car. It fits your description to a "T".
However, the codes you are getting are not what the service bulletin reports. The code they say it sets is DTC 0400 which relates to an irregular EGR operation, causing a problem where it will not maintain an idle or Will idle roughly. There is not a recall campaign on this item.
As far as misfire problems: Nissan had a service bulletin out on problem ECM's which caused this problem. Check with your local dealer. This may possibly be covered under warranty.
The reference number is NTB97-026 The bulletin was issued March,12,1997 There was no recall on this item.
Good luck to both of you.
SOURCE: 97 Nissan Maxima OBDll code
The code p1400, is for an egrc solenoid valve, not the egr valve, they are 2 seperate items
exhaust-gas recirculation (EGR): An emissions-control system that reduces an engine's production of oxides of nitrogen by diluting the air/fuel mixture with exhaust gas so that peak combustion temperatures in the cylinders are lowered.
exhaust-gas recirculation valve (EGR valve): A valve, generally vacuum operated, to regulate the exhaust gas flow into the intake manifold.
EGR control solenoid (EGRC): receives ported and manifold vacuum, an EGR temperature sensor and a control backpressure transducer valve. THE operation of the system is controlled by the PCM which operates the EGRC solenoid. The manifold vacuum system utilizes a vacuum tap in the air intake system positioned after the throttle valve. The ported vacuum control system uses a vacuum tap in the throttle body which is exposed to an increasing percentage of manifold vacuum as the throttle valve is opened during acceleration. The backpressure transducer valve monitors the exhaust backpressure as the engine rpm increases or decreases to aid in controlling the amount of the EGR vacuum signal. The EGR temperature sensor is used to inform the PCM of temperature changes in the EGR passage way. This helps the PCM determine the EGR on/off time.
that should help on what they all do.
now by knowing all of that i highly doubt that the control solenoid could cause the problem, and if it was that then u probably have a PCM problem not the solenoid or both.P01400 generally means that the ECM is not seeing the correct voltage drop when it grounds the EGRC valve located between the banks of CLY'S near the top Radiator hose location the EGRC solenoid valve turns vacuum on to the EGR circuit or vents. With a OHM meter unplug the EGRC valve and measure resistance at the two pins. Most likely your car has a bad EGRC valve or a BAD wire to it from the engine control module. Valve Nissan Dealership would cost around $45 labor to diagnosis and replace $150. Make sure proper diagnosis is performed check the engine wiring harness with a stop lamp light bulb hooked to the EGRC connector to see if it lights up when driving. That way you know the circuit is ok. A engine harness with a open circuit is a bad surprise after spending $200 for the valve. Good Luck
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.
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Symptoms
You may notice drivability problems
including a lack of power and perhaps some hesitation. There may also be other
symptoms.
Causes
A code P0325 most likely means one or more of the following has
happened:
Sources: W. Farmer - Nissan
P0400 - Exhaust Gas Recirculation Flow Malfunction OBD-II Trouble Code Technical Description
Exhaust Gas Recirculation Flow
Malfunction
What does that mean?
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.
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Symptoms
No symptoms will likely be noticed by the
driver other
than the MIL (malfunction indicator lamp). However, non visible symptoms will be
increased combustion temperature and increased Nox emissions.
Causes
A code P0400 may mean that one or more of
the following has happened:
Since EGR valve designs are different, no
one test will suffice:
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