TRNW-2: 4L60E 2-3 Flare Question

[Tod Chretien]

[[ /I've not seen an aftermarket MAF that worked correctly yet ]]
/

Me neither. OEM or Delphi is a must.

On 6/26/2025 10:28 AM, Steve Everett via trnw2 wrote:
>     A gauge would be helpful, to check line rise, as far as replacing 
> the MAF sensor ,  what did you replace it with ? one from a parts 
> store?  unless it was a Delphi part, or actual AC Delco ,  chances are 
> it doesn't work correctly , Delphi makes the MAF's for AC Delco,  
>  I've not seen an aftermarket MAF that worked correctly yet,
>
>    As a quick test you can unplug the MAF and drive it with it 
> unplugged,  if the flare goes away its related to the MAF, since its 
> two completely different units I'm betting on it being a MAF problem,  
> you should also check the air filter, I've found most customers seldom 
> ever change them,  I've pulled them out so stopped up I don't 
> understand how the engine ran.
>
>     Steve
>
> On Thu, Jun 26, 2025 at 11:34 AM Tony's Autoworks via trnw2 
> <trnw2 at trnw.net> wrote:
>
>     Hello group,
>
>     Got a 2001 Chevy Suburban with a 4L60E and it flares on the 2-3 shift.
>     It does not happen all the time but will with medium to heavy
>     throttle. I installed a unit that I had on the shelf and on my test
>     drive I had the 2-3 flare. I cleaned the MAF and thought it had gone
>     away but the unit only lasted a week and it came back with no 3rd or
>     4th and the transmission temp light on and the unit was overheating at
>     idle. Figured I had a cooler blockage and replaced the radiator and
>     rebuilt the original unit that came out of the vehicle and installed
>     it. Still getting a 2-3 flare. I replaced the MAF with no change.
>     Transmission is not overheating. The only thing that is the same
>     between both units is the new torque converter. Could the torque
>     converter cause a 2-3 flare? or do I have something else with the
>     vehicle causing the issue?
>
>     Tony
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>
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-- 
Best Regards,
Tod Chretien
TRNW Inc.
http://www.trnw.net
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