Bucking And Jerking..02 Sensors??

[chris42773]

i have a 94 q45 and im kinda confused so here goes..car starts up great runs great until it gets warm and then it starts bucking and jerking and wants to stall ..it throws a check engine light but goes away if you back off the gas for a minute or two and then the car drives normal again and another problem im having is TCS and SLIP light come on(you can hear it clicking under the hood before the lights come on) when you first start the car but i think thats a seperate problem and basically probaly just needs a new relay...like i said im confused and any opinions and advice would be much appreciated

[3Q Jay]

welcome.
you are in the right place for the G50 (1st gen Q45) platform technical knowledge.
Spend some time researching within the forum, this will help you and help us to help you.
you will need to access your ECU codes. This can be done with a screwdriver once you reach the ECU, but it is very inconvenient.
The better approach is to buy a consult like interface that works with your laptop. this will not only allow you to read and also erase codes, but to monitor parameters real time and plot the data. yes, O2 sensors are supported by all those interfaces.
but that may or may not be your actual problem.
your chassis does NOT support OBD-ii protocol, so dont waste your time with a generic scanner.

[chris42773]

the ecu has been replaced..still the same problems

[mattd1979]

My nephew's 1990 Q did this same thing and I found that when I disconnected both o2 sensors, the bucking cleared up. Try disconnecting both sensors and see how it does. If it still continues, it could be your MAF and it may need to be cleaned.

Matt