2000 Cadillac Deville P0101 MAF sensor and or performance

Tiny
ENIGMA0303
  • MEMBER
  • 2000 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 145,000 MILES
I filled my tank up and added Berrymans b12 in gas tank at that fill up. The temperature was 30 degrees or less for most of the day. I get a engine light, code was MAF, I replaced the old one keeping mind to ensure no air leaks when installing the new one. A day or two later weather is still in the low 30's or colder and I get a stutter in the enging, a slight one then smoothes out. I have Autoxray 6000 connected, I find a pending code of the p0101 MAF sensor, I later sprayed berrymans b12 carb and throttle body spray to check for leaks as it was idling, did not hear any rpm increase, I checked all air clamps to ensure they were tight. Checked the MAF conector to see if any pins were bent, none were bent, re connected it. Drivability now is more frequent with the hessitation sometime around 42 mph and 62 mph, instead of once or twice I feel more 5 - 6 times one way. All this started when the weather got colder and after I added berrymans to the gas tank. I do not believe berrymans did anything as it is a additive, and GM was or is still using it themselves. Any ideas?
Wednesday, January 13th, 2010 AT 3:34 PM

11 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,119 POSTS
Are you still getting the same code? Is it doing the same thing as the old MAF?
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+1
Wednesday, January 13th, 2010 AT 7:21 PM
Tiny
ENIGMA0303
  • MEMBER
  • 5 POSTS
I am currently not getting an actual code tripped with the service light, I have a pending code for the same at this time. The old MAf triped service light which yeilded the maf code, which I replaced it, and I am only getting the pending code not a service light with actual maf code yet or at least not to this point. As for the 2nd part of your question, it is only producing a pending code now.
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Thursday, January 14th, 2010 AT 9:17 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,119 POSTS
Recheck to make sure all connections are clean and tight. Also, if they are, you may have gotten a bad part.
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Thursday, January 14th, 2010 AT 10:33 AM
Tiny
ENIGMA0303
  • MEMBER
  • 5 POSTS
All conections are tight. Just replaced it again. Will know later tonight or tomarrow morning if it was that.
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Thursday, January 14th, 2010 AT 2:25 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,119 POSTS
Let me know what you find.

Joe
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Thursday, January 14th, 2010 AT 3:57 PM
Tiny
ENIGMA0303
  • MEMBER
  • 5 POSTS
It is doing the same, a pending code for MAF sensor air flow performance issue P0101. A trouble code was not found now, a pending code was.
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Friday, January 15th, 2010 AT 6:45 AM
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Post for me the full 17 digit VIN, I can run it and see if there is a calibration upgrade to the PCM, to address a false P0101. I believe there is for your vehicle.
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Friday, January 15th, 2010 AT 10:32 PM
Tiny
ENIGMA0303
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  • 5 POSTS
VIN 1G6KD54Y2YU274933
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Monday, January 18th, 2010 AT 7:37 AM
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Here is what I found, and your vehicle does apply. The only determining factor is what the current calibration is. This would be something a dealer could interrogate and find out. It may be a bit difficult to read with this layout, it was the best that copy/paste could do.

12566985 - Control Module

12567188

12567936

12573775

12585584

Part Number Cal. ID# CVN Description
12585584 12585667 0000D56B New calibration to improve generic scan tool operation
12573804 00003585
12573775 12573568 0000FF61 New calibration to correct false setting of DTC P0327
12573804 00003585
12567936 12568840 00007B9E New calibration to correct false DTC P0101 and/or P0327
12567965 0000624A
12567188 12567236 0000C6FE New calibration to implement the crank sensor ignition diagnostic fix
12567217 0000B682
12566985 12567031 000090CC Control module calibration
12567013 0000D541

Selected Options:
VIN: 1G6KD54Y2YU274933
Controller: PCM/VCM Powertrain/Vehicle Control Module

You said you sprayed for vacuum leaks and did not notice an idle increase. That may not have identified a concern. Ideally, looking at fuel trim values while checking is a more secure method, Due to strategy, the vehicle may make idle corrections, and it may go unnoticed, if anything, the idle may decrease. Bottom line, there is probably a calibration upgrade for a false setting P0101. If it is a fault, the calibration may not technically resolve it. If it is setting as a result of unmetered air entering the engine, you have a small number of possibilities. The intake plenum boot between the intake and throttle housing is most probable. Often times it splits on the lower portion, and can be accompanied by a P0171 and 174(both banks lean). Other than that, secondary air vacuum solenoid source, fuel regulator vacuum line, and the breather hose are the others.
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Monday, January 18th, 2010 AT 9:27 PM
Tiny
RONB1822
  • MEMBER
  • 2 POSTS
Got a 2000 cadillac Deville with an accelerator that accelerates without touching the pedal. We diagnosed by taking starting fluid and spraying by intake. After removing intake we noticed that in the intake boot that the round part going into the intake, had a very small crack on bottom. After changing boot. Put intake back on, the car has ran fine ever since. You will not see the crack unless you take it off. This part cost $28 to replace.
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Saturday, February 24th, 2018 AT 8:01 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,714 POSTS
Great addition to this thread! Please feel free to help out whenever you are on the site :)

Cheers, Ken
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Tuesday, February 27th, 2018 AT 3:23 PM

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