What could cause my car to shake and lose horsepower when accelerating rapidly?
What is your question?
I've only owned it for 4 months so I'm not sure about past maintenance. I replacedthe coils and spark plugs when iI got it. I felt it sputter a few times, like a misfire, so I took it to my Volvo mechanic. He told me the only issue he could find was low/dirty oil. So we did an oil change. It is still having the same issue. When I get on the freeway or speed up to go around someone the engine struggles and the check engine light flashes. City driving is perfect. I do get electrical fluctuations when I use my AC, so I stopped using it, but I still get the shaking on acceleration. I was thinking if I can get help in the forums I can tell my mechanic specifically what to fix so my car doesn't die. I love my car. Its been my dream car for the past decade.
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The shop did plug it into the computer. The only code it had was for a misfire in cylinder 8, which is impossible on a 5 cylinder car, and a mirror temp sensor error. And this is a volvo specialty shop.
provide me with the trouble codes. I may give this one a direction. :)
ECM-1100 Outside temperature sensor- signal too low ECM-644A Camshaft control - faulty signal (was yellow the mechanic says this means it is not causing any problems, is he lying?)
Camshaft trouble code can be causing ur issue. Have ur vehicle's timing checked. V70 uses a belt so they wear overtime and is recommended to be replaced every 100k miles. Check ur owners manual for the right interval. Also check ur cam vvt which adjusts ur timing depending on driving conditions this vvt is electrically controlled and allows oil to pass Thru small orifice in the vvt which can be clogged by oil sludge and debris. A not uncommon thing to happen on a 12 year old car. A clogged vvt or bad electrical connection to the vvt can cause issues as well. Also, i think yellow means the problem is not currently present. But was stored as a history code. Update us with the fix as i am curious. Im sure someone wil be help by this thread somewhere down the road.
It has a new-ish timing belt. But I will have him check out the vvt. Thank you so much for some sort of direction to go in. Hopefully this helps. I'll let you know. :)