Isuzu Trooper Runs rough check engine light reduced power?

Answer 1

Check Engine and Reduced Power

P0401, P1125, P1295, P1515

I had this problem. It drove me crazy for a while. My father previously owned the car and a professional mechanic serviced the car several times. He replaced the accelerator position sensor and whatever else he did I don't know. I don't blame the guy for not being able to fix it, as they only have so much time to figure car troubles out because they have other people to service. However, I am just someone who began to read a significant amount of information on the automobile: the engine, the brakes, the suspension, the sensors, ...the overall functioning. I did two gasket overhauls, with changing various parts to update the functioning (timing belt, plugs, several sensors, cooling system parts, charging system, pulleys, dented oil pan, oil pump, seals, valves on one of the cars, ...whatever I thought "hey, after 200,000 miles, it probably makes sense", I think it does; mind you, I did do specification checks on what needed checking with the cylinder heads). I still drive one of them (3000GT, may as well be a car you like), and a 2000 Eclipse (bought it brand new, and constantly kept up on the oil), which is now deceased (I won't go into the details), but I still pulled the engine (which still ran awesome, when I checked to see if it still ran <thank God, that would have been a total waste> and to replace this car....ta da >>> my old man gave me the 2000 Trooper. (I apologize for the long story, just want you to get an idea of what where I'm coming from)

With 168,000 miles, and no timing belt change, sparks pugs, literally nothing... I went ahead and did all that plus some other stuff merely because I was deep enough into the area, or had access, rather. When I pulled off the "common chamber" which is the intake manifold I began to clean it and was surprised by a large blot of built up crap in the port for the "MAP SENSOR!!!". It ruined the sensor itself which I did not rule out right away because I just wanted to see what would happen. I left the old one in but purchased another one just in case. Low and behold a few days went by, there were no mil or reduced power for those few days but bam they did come back on. I REPLACED THE OLD MAP WITH THE NEW AND NOW IT RUNS BEAUTIFULLY, NO PROBLEMOS. It's been a couple of months now, I can take it anywhere and not worry about the limp home mode preventing me from controlling the throttle and making me feel like the only idiot being able to reach that 10 MPH limit on the way back home.

I did purchase an Isuzu electronic copy of the manual (from HELM INC.) and it mentions so faintly about the correlation between the MAP reading and the throttle position. They mostly point to the TPS or Accelerator sensor predicament, so who'd of thought (I can only imagine that you can only publish a limited number of scenarios, not every possible one). The MAP reading also affects the EGR reading which was the initial check engine light cause. This was definitely what fixed mine.

ON A FINAL THOUGHT:

The automotive engine and the whole car itself is really really really a crazy marvel of invention. And though this world doesn't push people to realize this in its most direct way. after all, who has time right? people should make time to try and follow how it works and what keeps it working. It would save a lot of misery and aggravation.