I posted this question in the GX forum, but figured I'd try here too for the larger audience. Same engine anyway. I have a 2008 GX470. Have had P0328 knock sensor code intermittently for a while. Lately it's been coming on more frequently.
Took the car through a car wash yesterday and on the drive there and back noticed a marked sluggishness. It seemed to hesitate upon acceleration before getting to 3,000 RPM or so, and just generally didn't behave like itself. I figured I'll scan for codes again and see if there is anything new. Sure enough, besides the P0328, now I am showing P0441, P0455, P0456.
P0441 - Evap emission control system incorrect purge flow.
P0455 - Evap leak (gross)
P0456 - Evap leak (very small)
Here are the techstream readings. I'll admit I don't know how to make sense of this. Hoping someone can tell me if this tells a tale. The first screenshot is with the AC's running, so higher RPMs. MAF reading is higher than the second screenshot which is just idling with no AC on.
I already ordered a gas cap gasket to replace on my gas cap. Anything else to check besides that?
Any chance this is somehow related to the knock sensor issue?
Appreciate the help.
Took the car through a car wash yesterday and on the drive there and back noticed a marked sluggishness. It seemed to hesitate upon acceleration before getting to 3,000 RPM or so, and just generally didn't behave like itself. I figured I'll scan for codes again and see if there is anything new. Sure enough, besides the P0328, now I am showing P0441, P0455, P0456.
P0441 - Evap emission control system incorrect purge flow.
P0455 - Evap leak (gross)
P0456 - Evap leak (very small)
Here are the techstream readings. I'll admit I don't know how to make sense of this. Hoping someone can tell me if this tells a tale. The first screenshot is with the AC's running, so higher RPMs. MAF reading is higher than the second screenshot which is just idling with no AC on.
I already ordered a gas cap gasket to replace on my gas cap. Anything else to check besides that?
Any chance this is somehow related to the knock sensor issue?
Appreciate the help.
