2008 G6 3.5L. Under heavy accel, the engine ‘cuts out’ at...


2008 G6 3.5L. Under heavy accel, the engine ‘cuts out’ at 4000rpm in every gear. It is a shutoff type of response. If I keep pedal planted it throttles back/down like I let off down to idle. Just purchased car, owner thought it wa...

2008 G6 3.5L. Under heavy accel, the engine ‘cuts out’ at 4000rpm in every gear. It is a shutoff type of response. If I keep pedal planted it throttles back/down like I let off down to idle. Just purchased car, owner thought it was a tranny problem. But it’s clearly a sensory problem transmission acts totally fine. Mechanic's Assistant: How many miles are on the Pontiac? What size is the engine? 130k 3.5L Mechanic's Assistant: Are you fixing your G6 yourself? What have you tried so far? Yes. Haven’t tried anything. It has handful of O2 sensor codes. Was going to start there. I have seen how the cat can be clogged. But it doesn’t ‘sputter’ or struggle. It hits a limiter or threshold had cuts out. Mechanic's Assistant: Anything else you want the Mechanic to know before I connect you? No thanks

Automotive Expert
Howdy from Tennessee, I'm Chris aka Moose. Who am I helping today? I'm glad you've come here to get help. I will do my best to get the answer you are looking for. I help many customers, so sometimes my replies are delayed, I will respond once available. I try to be online at 1-5 pm and 10 pm-5 am every day. - Can I get the stored codes? - If you do not hit 4k, does it run perfectl?

Name is \*\*\*\*\* \*\*\*\*\* Columbus NE! Runs fantastic otherwise. P0036 P0054 P0056 P0060 P0141 P0160 P0161 A bundle of O2 downstream it looks like, I wasn’t sure if a O2 issue like this would cut the car off like that.
Automotive Expert
Hello, Clay P0036 bank 1 sensor 2 heater issue P0054 bank 1 sensor 2 heater resistance P0056 bank 2 sensor 2 heater issue P0060 bank 2 sensor 2 heater resistance P0141 bank 1 sensor 2 performance P0160 bank 2 sensor 2 activity P0161 bank 2 sensor 2 performance You obviously have some O2 sensor issues with the sensors or their wiring but those should not cause the symptoms you have. I believe there is a concern with the fuel pressure not able to keep up. I do recommend diagnosing and addressing the codes, steps are shown below, but I would also check the fuel pressure during the 4k RPM issue. [https://www.dropbox.com/s/tx1i9bur6gmlnm4/G635heater.pdf?dl=0](https://www.dropbox.com/s/tx1i9bur6gmlnm4/G635heater.pdf?dl=0) The fuel pressure should stay between 56-62 psi. Thank you for seeking us for help, I hope I provided what was needed. Press reply if you need to follow up. If you liked my answer please let me know so I can mark your question complete. Moose

Perfect will do thanks
Automotive Expert
Glad to help

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