[acejed]

Having occasional stumbling and stalling. Usually within 5 minutes of start up. One stall and its usually fine for the day. If i keep my foot on the gas it will get past the stumble. History of vehicle: 79 gle . 84 engine and 5 speed. Just about everything on this car has been replaced with in last couple years. Exception being the fuel pump . Head/valve job last year. All tune up items are new. Warm up regulator? Thanks in advance

 

[Jim Mesthene]

Lambda pulse setting?

 

[acejed]

Is that the small capsule by the fuel filter ?

 

[jvanabra]

It was always the warmup regulator on my '80 900T. (Which is why it doesn't have CIS anymore... )

 

[Jim Mesthene]

The Lambda system sets the mixture according to information from the O2 sensor (within a narrow range).
The setting is expressed in Pulse Relations or Duty Cycle. It must be in its working range.
The other thing is a Pressure Impulse Contact.

 

[c900]

The WUR can be the culprit, but also check the AAV is working right - it's just like the AIC on a 16V car but doesnt have an 'ecu control' function as it's simply a two-wire device. It's interesting that 8V cars in some markets got lambda and some didn't.