QuestionQUESTION: My Vision runs very sad when it rain or the air is full of humidity. When, the
left side of the motor (the 3 cylinders) not runs but the compression is
normal. Any misfires, and also the motors don't start sometimes. The
phenomene is only went the climat is full of humidity. Went the car, and also
the motor, is dry, is run normally and great. I have change the spark plugs,
the sparks wires, the crank sensor, the ignition coil, the full filter, the intake
gasket, the computer. Please help me and excuse me for my poor English
ANSWER: Hi Yves,
I would have suspected the spark wires, but you already replaced those.
Have you tried for fault code readout? If not, use the ignition key:"on-off-on-off-on and leave on", doing that in 5 seconds or less elapsed time. Then watch the check engine light, which remains "on", to begin to flash, pause, flash, etc. Count the number of flashes before each pause. Then repeat the process to assure accurate counts. Then combine the numbers in the order they appeared into pairs, to form 2-digit numbers which are the fault codes. The last such number will always be 55 which means "end of readout".
Then write back or go to www.allpar.com/fix/codes.html for a code translator.
Your English is excellent!
Roland
---------- FOLLOW-UP ----------
QUESTION: The only code a see is the 55 code.
AnswerHi Yves,
There are a few malfunctions that are not detectable by the engine controller. The first one to look at is the egr valve (exhaust gas recirculation) which can get dirty and thus sticks in the ajar position which will cause a no start or missing. It might be more likely to do that in a humid condition. Look for a small pipe the runs from the rear side exhaust manifold back to the air intake area/throttle body. Along that pipe you will find the valve' body attached into the pipe, and it also has a round vacuum chamber on the top. Between the top and the valve body is a flange and inside the flange you will see a rod with a circumferential slot. That rod is the valve stem. Use the tip of a screwdriver inserted in the slot to lever the valve back and forth, against spring-action in one direction which is the valve-closing direction. Feel to verify that the spring is closing the valve so that the stem is seated and at a full stop. If it seems to not move freely then spray some solvent/lubricant (such as WD-40) on the valve stem where it enters the valve body and then move the stem again to see if you have freed the action.
The other simple check is the ground connections of the battery -post cables. One is to the engine/transmission the other to the body near the battery. Make sure the ground connections are clean and shiney and tight.
I don't see anyother systems that aren't monitored which might be the cause. But let me know what you find.
Roland
