07-09-2016, 11:01 PM
Join Date: Mar 2009
Location: Georgetown, Guyana
I can't say that there are many recurring problems inherent to the any of the J20 engine's systems.
The timing chains can be problematic IF regular maintenance is neglected, and some folks have had "heat soak" issues with the cam position sensor, but, the symptoms of that failure don't match yours - the engine starts & runs well, but will run rough and eventually stall after it's been running for a while, it will then not restart until it has been allowed to cool, a process which can be accelerated by cooling the cam sensor with a wet rag.
From what you say, yours runs poorly from the get go and gets worse as it gets out of cold start mode - what that says to me is that you have an emission control system related issue (which is also where your codes are pointing) - in cold start mode the engine is running in what is termed "open loop", it's ignoring feedback from certain sensors and fuelling based on a preset map, when it goes into closed loop, it fuels from a different map, and adjusts based on the input from those sensors.
It seems to me like you have the tools (the codes) and you're choosing not to use them - what are the codes it's reporting?
98 - 1.8 Mitsubishi Pajero iO
98 - 2.0 Suzuki Grand Vitara - SQ420
05 - 2.0 Suzuki Grand Vitara - JB420
15 - 2.4 Kia Sportage