rasheed
Well-Known Member
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I have an interesting phenomenon of more power and smoother driving at night or early in the morning than during the heat of the day. Its hitting over 38 degrees in the middle of the day and I notice consistently when it gets above about 30 the car just loses power and it feels like I'm towing a dead elephant. Am I right in guessing this is ECU/MAF related and that its changing the mapping somehow to cope with what it considers (a) thinner air or (b) extreme ambient heat conditions? Also at about those temperatures the AC quits. There are other AC related problems I'll get to later but could it be the BECM or ECU telling the AC to leave off and not put additional load on the engine?
So two questions, why lose power if its hot outside and why does the AC die when most needed? Hope better brains than mine will weigh in!
Cheers.
Edit: Correction - AC stops cooling but does not quit. It IS an extra load on the engine, (this is the other issue, it feels much heavier over the last few days, noticeably sapping engine performance where it was fairly imperceptible before). Switching it off at the HEVAC unit disengages the compressor clutch and frees up the car a leeeetle bit. This is not in Berlin by the way its in Dhaka where I "commute" for work.
So two questions, why lose power if its hot outside and why does the AC die when most needed? Hope better brains than mine will weigh in!
Cheers.
Edit: Correction - AC stops cooling but does not quit. It IS an extra load on the engine, (this is the other issue, it feels much heavier over the last few days, noticeably sapping engine performance where it was fairly imperceptible before). Switching it off at the HEVAC unit disengages the compressor clutch and frees up the car a leeeetle bit. This is not in Berlin by the way its in Dhaka where I "commute" for work.
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