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You have rvc/regulated voltage control, that circuitry is in your pcm. I'm not saying the pcm is faulty, at the moment, I don't know? You also have a battery temp sensor in the battery tray housing, that might cause problems?
Check for applicable charging system trouble codes, if you haven't already.
Based upon the info you've offered, I'd suggest your 1st and easiest fix be checking that your gas cap is firmly secured. If it's loose or missing your tank would vent any pressure that might be built up, right out the pipe that the gas cap is intended to seal.
that black box is the chacoal canister and the hose is from the evaporative sistem ...... when the car is on or the engine runing the extra gasoline cameback to the tank and make pressure on it if the hose is off or broken from the charcoal canister the . check engine light have to be on check the tip of the hose if dont fit tight or is loose will fail the smog test good luck
Since I no longer live in California, I don't care what you do but your problem sounds like the EGR system and if they replaced the valve, it isn't working, probably stuck open.
This allows exhaust gases to invade the engine when it can't tolerate it; that path should only be open when the engine isn't pulling hard or at an idle.
That widget also costs gas mileage so I always stuck a ball bearing or a screw into the vacuum hose that controls it disabling it so it never opened.
On some vehicles that can give back 10-15% of your lost gas mileage.
However, if the valve is stuck open, plugging the hose won't help at all.
A failed camshaft position sensor will show up in a number of ways. The worst-case scenario is that there is no spark in the combustion chamber. Other symptoms can include excessively long cranking time when starting cold, rough running on an intermittent basis, poor idle, stumbling or hesitation, a drop in mileage and stalling upon acceleration. These symptoms may also be caused by a failure in the wiring of the sensor.
see if also black smog is coming from exaust, if it is , most lijkelly your injector assembly is bad, but if not black smog try to locate a vacium leak, vacium leak is identified as air noise on engine while engine runing like hiseling noise.
Carburetor or fuel injection?
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