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2000 Nissan Altima PO325 and PO300

Tiny
KD7YNB
  • MEMBER
  • 2000 NISSAN ALTIMA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 90,000 MILES
Hello. I have a '00 altima and its throwing po325 and po300. What would be some steps to start to diagnose the prob. I might change plugs, wires, cap, distributor and maybe even knock sensor itself. What would cause both those codes?
Sunday, December 16th, 2007 AT 11:34 PM

11 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0325. Knock Sensor 1 Circuit (Bank 1 or Single Sensor

P0300 Random msifire

Random misfire normally will be caused by vacuum leak or bad fuel.

Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
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Sunday, December 16th, 2007 AT 11:47 PM
Tiny
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So where do you think I should start?
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Monday, December 17th, 2007 AT 12:23 AM
Tiny
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Start with the EGR exhaust gas recirculating valve-open it up and inspect for carbon to include its passages thru the manifold.
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Monday, December 17th, 2007 AT 12:25 AM
Tiny
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K. What I see looks like 2 egr valves ontop of engine. I know that it looks like a spaceship and there is two of them. Yea im only ASE certified in brakes and steering and suspension so not helpful. What u mean by open it up, take off or just use scan tool?
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Monday, December 17th, 2007 AT 12:27 AM
Tiny
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Find it and remove it and inspect for carbon on it and the passages. Could be that its not closing creating vacuum leak.
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Monday, December 17th, 2007 AT 12:31 AM
Tiny
KD7YNB
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Ok but that could cause it to throw both of those codes? Cuz its a knock sensor malfunction, not low circuit or anything
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Monday, December 17th, 2007 AT 12:32 AM
Tiny
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The knock sensor's job is to retard the ignition timing when engine is pinging/detonating-

Hit the EGR 1st for the P0300 and follow with the KS.

What type of fuel are u using-
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Monday, December 17th, 2007 AT 12:35 AM
Tiny
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Actually its my friends girlfriends car. Most likely 85, its a girl. I know there is a tsb about the KS going bad on those so I pulled a plug today and they were ok, so I just figured replace the KS and tune up, and maybe fuel filter. But I figured if it was the EGR it would throw a code if it was that bad.
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Monday, December 17th, 2007 AT 12:38 AM
Tiny
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My friend the EGR can give a tech the crooked winding curveball that a scantool won't even pick-up they don't always pop up-I called it a magic valve with a head spinner.
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Monday, December 17th, 2007 AT 12:43 AM
Tiny
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Check out my grocery list in my 1st respond to knock out the P0300
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Monday, December 17th, 2007 AT 12:45 AM
Tiny
KD7YNB
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K well ill check that. Also I read about bad intake man. Gaskets going bad on those too so maybe thats something to look into after the egr issue?
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Monday, December 17th, 2007 AT 12:45 AM

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