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Car Forum / Nissan / Nissan Cars / December 2004

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Failing Smog Test help - 96 Xtra Cab (Auto, 4 cyl)

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Slacker - 29 Dec 2004 00:43 GMT
Here are the symptoms:

- Check Engine Light on.
- Slight Hesitation when accelerating from a dead stop.
- There's a ticking sound coming from somewhere near/underneath the air  
cleaner. Only happens when truck is moving, and is intermittent. This  
sound happened all the time before the replacement of the EVAP Solenoid  
and Idle Valve Assy... now it rarely happens, but still does once in a  
while.

Emission Test Result: Everything passed good with the exception of the

        NO(PPM)
@15 MPH       1993 (max allowable 539)
@25 MPH       1816 (max allowable 792)

I took the Emission test when my check engine light mysteriously  turned  
itself off.

Repairs I've had done (before the smog test): Replaced cracked exhaust  
manifold. Replaced AAC Valve Assy, Idle Air and the EVAP Solenoid.

The repairs were done in response to the following codes found in the  
computer: PO304 & PO402. There was at least on other code, but I forgot  
what it was :-( I want to say P442, but I'm really not sure.

Any idea on what could be causing the really high NO readings and the  
check engine light?
Signature

Slacker

Slacker - 28 Dec 2004 22:57 GMT
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JimV - 29 Dec 2004 02:21 GMT
> Here are the symptoms:
>
[quoted text clipped - 24 lines]
> Any idea on what could be causing the really high NO readings and the  
> check engine light?

You need to have the current codes read for anyone to make an educated
guess.
Idlafie - 29 Dec 2004 10:03 GMT
NO is produced when temperatures in the combustion chambers exceed 2500
degrees Fahrenheit. Excessive engine temperatures could be caused by a
lean fuel mixture, by retarded timing, by carbon buildup inside the
combustion chamber, or by a malfunctioning engine cooling system. The
function of the EGR System is to reduce NO. It does this by rerouting
exhaust gases back through the intake manifold to lower engine temperatures.
Check to see if the EGR valve is getting vacuum. There is usually a
little vacuum hose on the side or the top of the EGR valve. Remove the
vacuum hose, place your fingertip over it & rev the engine...you should
feel suction on your fingertip as you rev the engine. If you're not
getting any suction, then check the secondary valves on the EGR system
for either faulty sensor or cracked, melted or broken vacuum line.
If the EGR system is okay, then check your timing along with pouring
some Seafoam into your crankcase, intake manifold & gas tank.
http://www.seafoamsales.com/motorTuneUpTechGas.htm
That will help get rid of the carbon buildup in the combustion chamber.
Anyhow, hope this helps...
ID

> Here are the symptoms:
>
[quoted text clipped - 24 lines]
> Any idea on what could be causing the really high NO readings and the  
> check engine light?
Slacker - 29 Dec 2004 22:22 GMT
Hmmm... interesting, maybe my friend is right about the timing belt/chain  
thing??

Anyway, I got an appointment to have it looked at this Friday.

Thanks for the detailed info.
--
Slacker

> NO is produced when temperatures in the combustion chambers exceed 2500  
> degrees Fahrenheit. Excessive engine temperatures could be caused by a  
[quoted text clipped - 38 lines]
>>   Any idea on what could be causing the really high NO readings and  
>> the  check engine light?

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Slacker

 
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