2000 Malibu surge under load Have recording from code reader.

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Mar 23, 2013 | 8:17 PM

mjshort

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2000 Malibu surge under load Have recording from code reader.

I have a 2000 Malibu, 3.1L V6 with 167000 miles on it. I've had a problem where the car surges when under load, cruising around 60 MPH going up a hill. You can see the RPMs changing on the tach. Usually just a couple of hundred RPM.
I've read many posts that had fixes from new plugs to temp sensors. I've replaced most of them and I just tried cleaning the MAF sensor, as well as the EGR valve. It seems slightly better, but it still does it.
I've attached a recording from my actron reader. Is there anyone out there who can read these? The surging started happening around frame 8 thru 11 (approximately, it was hard to watch and drive). Any help would be appreciated.

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Malibu surge.txt (10.6 KB, 353 views)

Mar 24, 2013 | 8:35 PM

mjshort

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Found it

I found the problem with my malibu. It was the MAF sensor. I found this on another forum:

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oNotPromoteQF/> <w:LidThemeOther>EN-US</w:LidThemeOther> <w:LidThemeAsian>X-NONE</w:LidThemeAsian> <w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript> <w:Compatibility> <w:BreakWrappedTables/> <w:SnapToGridInCell/> <w:WrapTextWithPunct/> <w:UseAsianBreakRules/> <w

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ontVertAlignInTxbx/> <w:Word11KerningPairs/> <w:CachedColBalance/> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> <m:mathPr> <m:mathFont m:val="Cambria Math"/> <m:brkBin m:val="before"/> <m:brkBinSub m:val="--"/> <m:smallFrac m:val="off"/> <m:dispDef/> <m:lMargin m:val="0"/> <m:rMargin m:val="0"/> <m:defJc m:val="centerGroup"/> <m:wrapIndent m:val="1440"/> <m:intLim m:val="subSup"/> <m:naryLim m:val="undOvr"/> </m:mathPr></w:WordDocument> </xml><![endif]--> GM informational document (#PI01385A):
4T40E , 4T45E , 4T65E Surge Slip Condition Under Load in 2nd, 3rd , and or 4th - kw 3.1 automatic body chuggle fourth hesitation hot LG8 miss second shift third valve #PI01385A - (Mar 25, 2004)
When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.
Condition/Concern:
The 4T40E/4T45E/4T65E automatic transmission may experience a slip surge condition in second, third and or fourth gears while under load, such as driving up a long hill or mountain. The conditions either separate or working in combination seem to cause the 'Engine Load %' to drop to a value which the PCM commands a lower line pressure (increase in PCS amperage).
'Normal' degradation of MAF over time aggravated by induction of foreign material (fine dust, oil from non-OEM air induction systems; secondly, build up of carbon deposits in combustion chamber/intake valves over time; thirdly, outside ambient temperatures above 95 degrees F(35 degrees C) seem to aggravate the condition.
Recommendation/Instructions:
The MAF should be swapped from a known good unit or replaced and the vehicle evaluated
Clean the top half of engine to remove carbon deposits.