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Old 02-23-2021, 04:17 PM   #1
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MAF is low

Over the last 600 miles I have been getting some high negative LT trims at idle. -11 and -8 but intermittent. They have always hovered around zero until recently. I cleaned the MAF and new filter 4235 miles ago. I'm in a rest area so all I can do is peek at the filter and it looks new still. I have 350 miles or so to get to where I can work on this issue.


MAF readings seem to be low though, especially at idle.


Idle 6.8 to 7.1
2000 21
3000 36


Didnt have a chance to do a loaded WOT.


Based on how clean the filter still looks I'm guessing the MAF is clean as well.


Is it possible the MAF is going out at lower RPM's? My trims look good cruising along steady at 55 or 60 MPH. 4 and 5 on the LT's, sometimes 6 and the ST's bouncing around -4 to + 4.


If not the MAF, where should I start looking, in order, to find out why it runs so rich at idle?



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Old 02-23-2021, 05:12 PM   #2
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It could be a dirty Throttle body or Idle air control valve. A can of throttle bottle spray cleaner through the throttle body with the intake hose off and idling. The idle will stumble or a code could be thrown. If you have a second in the drivers seat keeping it running but at idle helps.
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Old 02-23-2021, 08:23 PM   #3
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I was thinking along the same lines. I would clean the idle bypass valve.
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Old 03-01-2021, 12:16 AM   #4
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Old 03-01-2021, 12:17 AM   #5
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Old 03-01-2021, 06:31 PM   #6
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jim58, did you figure it out?
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Old 04-16-2021, 02:53 PM   #7
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Quote:
Originally Posted by ArtJoyce View Post
jim58, did you figure it out?

Not yet. I changed plugs and wires this morning. Still getting -10ish at idle. I thought it might have been a bad batch of gas at first but it's still the same.


I'm parked for 2 months so still tinkering with it.


I'll spray the MAF down and a new filter next week.


I have the doghouse off so I'll spray some cleaner down the throttle body. Easy enough from the inside...spray and work the gas pedal.


If none of that makes a difference I'll replace the MAF.


I bought a quart of Techron concentrate. I'll run that when I head back to Cal.



If anyone has any suggestions I'm all ears.



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Old 04-16-2021, 02:56 PM   #8
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I was thinking along the same lines. I would clean the idle bypass valve.

How do I do this? Where is it? What does it look like?


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