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Discussion Starter · #1 ·
so ....
2001 Nissan Altima GXE
error codes: multiple cylinder misfire and vacuum system vent control circuit system (vacuum leak, no big deal)
124,000 miles on it
no check engine light at all though that's good prolly means it's a minor fix and not the intake manifold gasket issue these things have commonly

what I was told by a nissan expert is :
"Probably a bad vent control valve. This is bolted to the canister under the car. If it's got misfires then I would check the intake manifold gasket first as suggested."
also " it's a good deal, it looks solid and if all it needs is a window you're doing good. If it needs an intake manifold gakset, roughly $800-$1000 Far as the windshield goes, I really don't know, same with the glass for the door, it's not something I have any pricing on. Another part they should look at would be the distributor, they tend to fail on this model as well. The thing is, since you don't have any check engine light the distributor is likely fine."

and lastly he said " hese cars have issues with the intake manifold gaskets causing rough running and misfires. You may also have an issue with a blocked catalytic converter. The engine itself is pretty bulletpoof and 120k is really nothing on these engines. Usually good for 200k or so."

that's all I know so far.

Any input you can give me as I'm taking it into all star automotive on Tuesday to have it fixed up to hopefully pass inspection and I would like to be prepared and equipped with the things I should know going into this so I can optimal result for the least amount of $. Please any input is appreciated very much thank you in advance!
infinite love,
-matthew roberts

trim style C

99 Posts
Several things that could cause misfires:
  • What brand of spark plugs are you using? You should be using OEM NGK plugs; other brands such as Champion or Bosch many times cause driveability problems in Nissan engines.
  • The cam position sensor may be marginal.
  • Incorrect fuel pressure. Tee-in a temporary fuel pressure gauge between the fuel feed hose and the fuel rail. The readings at idle should be as follows:
  • with vacuum hose connected to the fuel pressure regulator: 34 psi
  • with vacuum hose disconnected from the fuel pressure regulator: 43 psi
  • There may be a major intake system vacuum leak. To check the intake system for a vacuum leak, attach a vacuum gauge to a full vacuum source. With the engine fully warmed up, the reading at idle should be 18 - 20 InHg. At 3,000 RPM, it should be 21 InHg. If readings are under 18 InHg, check the intake manifold nuts to make sure they are tight. The gasket may have failed; spray a water mist at the gasket to see if the gauge reading changes. Also check the intake plenum bellows at the throttle valve and at the MAF for cracks or loose clamps.
  • Dirty fuel injector(s). Run some good injection cleaner, like BG products 44K, through the system; give the cleaner about a week or two to do it's job.
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