S10 4.3 misfire after high rpm
BF Veteran
Joined: Jan 2007
Posts: 4,622
From: Florida
Most of the local auto parts stores in the USA have loaner tools (with deposit) like a compression tester.
I noticed that you are from a different country. Just curious which one. Austria?
If your rear O2 sensor is cycling like the front - then your catalytic converter is definitely bad. But that doesn't mean the cat is your performance problem - the P0430 is only an effect of your performance problem. Misfires are what kills cats. Also know that cats are not always restricted when damaged, which appears to be your case. Just forget about the catalytic converter until you have the engine running correctly. Back to basics!! Don't get lost in the OBD2 jungle!
I noticed that you are from a different country. Just curious which one. Austria?
If your rear O2 sensor is cycling like the front - then your catalytic converter is definitely bad. But that doesn't mean the cat is your performance problem - the P0430 is only an effect of your performance problem. Misfires are what kills cats. Also know that cats are not always restricted when damaged, which appears to be your case. Just forget about the catalytic converter until you have the engine running correctly. Back to basics!! Don't get lost in the OBD2 jungle!
George
Thread Starter
|
Beginning Member
Joined: May 2025
Posts: 14
From: Austria, Vienna
Just ordered a compression test tool, gotta have one anyway!
Surprised you guessed right! Austria it is, at least for the last few years, not that common to loan tools here, found a few spots, but they have quite limited stock, plus it'd just be cheaper to buy one yourself- better in the long run too
Cat is most likely bad, but I agree, most likely not a root cause here. Gonna check the compression and the cat back pressure soon. Keep you posted, thanks guys
Surprised you guessed right! Austria it is, at least for the last few years, not that common to loan tools here, found a few spots, but they have quite limited stock, plus it'd just be cheaper to buy one yourself- better in the long run too
Cat is most likely bad, but I agree, most likely not a root cause here. Gonna check the compression and the cat back pressure soon. Keep you posted, thanks guys
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