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Tom
Tom, ASE Certified Technician
Category: Nissan
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Experience:  Qualified to repair all makes and models.
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1998 nissan altima 2.4l gxe.........engine at idle is spuratic, sputtering as if it wants

Resolved Question:

1998 nissan altima 2.4l gxe.........engine at idle is spuratic, sputtering as if it wants to die out .....have to give it gas to start...runs great when being driven...would this be caused by the knock sensor being disconnected...just replaced fuel pump, tried to replace knock sensor friend broke connector so it is not connected at all ...car was reacting like this before I even touched it just not this bad.....could it be the egr valve or egr transducer
Submitted: 4 years ago.
Category: Nissan
Expert:  Tom replied 4 years ago.
What's the code for the engine light other then the knock as sensor p0325.
Customer: replied 4 years ago.
p0171 bank 2 running lean.....p1402....p0325
Expert:  Tom replied 4 years ago.
Two issues the p1402 is an EGR issue . The valve sticking etc .

P1402 - EGR function (Open)

Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
Possible Causes
- The EGR volume control valve circuit is open or shorted
- EGR volume control valve leaking or stuck open
- EGR temperature sensor
Tech Notes
Start by cleaning the EGR valve, if the code persist it may be necessary to replaced the EGR Valve
Possible Solution
- Clean EGR Valve
- Replaced EGR Valve
When is the code detected?
EGR flow is detected under the condition that does not call for EGR.
P1402 Description
This system controls flow rate ofEGR led from exhaust manifold to intake manifold. The opening of the EGR by-pass passage in theEGR volume control valve changes to control the flow rate. A built-in step motor moves the valve in steps corresponding to the ECM output pulses. The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is determined by considering various engine conditions. The EGR volume control valve remains closed under the following conditions.
- Engine stopped
- Engine starting
- Engine idling
- Low engine coolant temperature
- Excessively high engine coolant temperature
- High engine speed
- Wide open throttle
- Low battery voltage
The p0171 is a faulty mass air flow sensor . These need to be checked next for this issue . The knock sensor will not cause this issue. These are the next steps. Hoped this helped . Positive feedback and bonuses greatly appreciated.
Customer: replied 4 years ago.
thanks alot ...went to buy those egr parts yesterday no one had them (except egr valve which I bought 3 months ago)probably dealer parts
Expert:  Tom replied 4 years ago.
Yes dealer will have these parts these are the next steps. Hoped this helped. Positive feedback and bonuses greatly appreciated.
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