4l80e change very quick to 4 gear ,first trip after start up

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Ponrov
Posts: 58
Joined: Mon Oct 17, 2005 11:58 am
Location: Norway Chevy 97 K1500 SCSB,. Pontiac Firebird Formula 72 400. Range Rover 77 Land Rover seri1-88 56

4l80e change very quick to 4 gear ,first trip after start up

Post by Ponrov »

Need som help/advice
4l80e change very quick to 4 gear ,at the first trip after start up ,but after 1.5 miles it's working normal.
If I stopp and turn off the engine wait 5 min and start up again , 4l80e act the same , but only after 0.5miles its ok.
I have test with diffrent oil temperatur its the same.
It's a 2wd , suspekt it act like it's 4wd in lowgear .
The car it's a 72mod Firebird ,400 Pontiac Engine with 0411/Road Runner ECU .


Br Ponrov

Ponrov
Posts: 58
Joined: Mon Oct 17, 2005 11:58 am
Location: Norway Chevy 97 K1500 SCSB,. Pontiac Firebird Formula 72 400. Range Rover 77 Land Rover seri1-88 56

Post by Ponrov »

the reason for 4l80e switching quickly up to 4 gears ,was that the connection C2 16 and 19 on the PCM were grounded.
so that PCM received signal that 4wd low range was enabled and front axle was engaged.

97k15004wd
Posts: 1158
Joined: Fri Oct 27, 2006 7:32 pm
Location: Waikikamukau

Post by 97k15004wd »

72 Firebird? have to see some pictures!!

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