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1999 Nissan Maxima stalling

Tiny
MR.MAX
  • MEMBER
  • 1999 NISSAN MAXIMA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 15,900 MILES
One month ago replaced all six coils - running rough.
SES light has been on for last 3 weeks, but car seems to run normally now. Mechanic said codes indicated "running lean" but no other info.
Been using regular gas since I bought the car at 98k miles.

Friday the car was fine; Sat. Morning no power; stalls when I push on the gas. Starts right up, idles ok, but no power. Can rev up to 3k if I push the gas pedal very slowly, but can't drilve out of driveway.
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Monday, February 8th, 2010 AT 5:01 PM

7 Replies

Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
If you would get some mass air flow cleaner and remove the mass air flow unit and clean it. If that don't help then you will need a digital multi meter to test it.
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Tuesday, February 9th, 2010 AT 9:31 AM
Tiny
MR.MAX
  • MEMBER
  • 4 POSTS
Cleaning MAF didn't have any effect. I have a digital multimeter; how would I use it to check the unit?
Thanks
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Wednesday, February 10th, 2010 AT 5:11 PM
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Do you have the code from when the engine light was on? Do you have a digital multi meter? Are comfortable doing some tests on the mass air flow meter if I get the procedure for you? Get back to me with what you can.
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Thursday, February 11th, 2010 AT 8:59 AM
Tiny
MR.MAX
  • MEMBER
  • 4 POSTS
I do not have the past code. THe last time he checked it, my mechanic said only that it was "running lean" and he couldn't get a definite reading.

I do have a digital multimeter.

I also replaced the fuel filter yesterday: no change.

Unplugging the MAF doesn't make any difference in the way it runs: won't rev above 2K, stalls under load.

Thanks
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Thursday, February 11th, 2010 AT 9:16 AM
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
OK at idle the mass air flow sensor should be putting out 1.0 to 1.7 volts and at 2500 rpm should be 1.5 to 2.1. If you can't get the enging to 2500 rpm with no load then the mass air flow unit is bad. You check the voltage at the white wire by back probbing the harness with a paper clip or something with the it plugged in. Make sure the engine is a full operating temp or you will get false readings.
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Friday, February 12th, 2010 AT 10:42 AM
Tiny
MR.MAX
  • MEMBER
  • 4 POSTS
I looked at my digital VOM, and realized that it's AC settings were 200 and 400 volts. No way to test the output of the MAF.
So I ordered one from Ebay for 60 bucks and it finally came today. Put it in, and the car revs right up. All seems to be well after a quck test drive.
Check engine light is still on. Oh Well.
A great learning experience.

Thank You for all your help!
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Monday, February 22nd, 2010 AT 3:48 PM
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
It won't go out till you turn it off with a scan too. So find a local parts store that will do a free scan and pull the codes so you can clear them and see if it comes back on.
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Tuesday, February 23rd, 2010 AT 9:10 AM

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