Volvo S80 A performance sedan that offers top notch luxury, outstanding handling and so much more.

Many Throttle Issues

Old 09-28-2018, 02:12 PM
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Join Date: Sep 2018
Posts: 2
Default Many Throttle Issues

Hello !
I just joined this forum because I bought a superb volvo s80 in february.

So... Bad things started when the car stalled and an unstable idle, up and down, (1000rpm, 1500rpm then 900... etc) and sometimes it would do it so low, it simply stalled. The stalling got fixed cleaning the Throttle body, awesome, but not the idle issue.
My mechanic dived into it and said that even if the throttle body was clean, it was dying and so were the spark plugs. He replaced the spark plugs and it was... smoother but still not good.
He then replaced the throttle body for a brand new one, original part from Volvo and boy hell unleashed. It had to be reprogrammed and the car ran like absolute garbage. The main dealer reprogrammed the throttle body and ... well.... it's drivable but not quite.

ISSUES RIGHT NOW: The car does two different weird things.
1. The rough idle: touch the throttle, it revs and goes back down to 1000rpm then rises to 1500rpm and back to 1000. It does this about 3-4 times and stabilizes.
2. Touch the throttle and the car starts to rev by itself ! all the way to 4000 then 3500, 3700, 2500 and stabilises... not... not brilliant.

What does my mechanic thinks it might be... he bought a specialized Volvo computer because the ones he had were no good. An error code for the Lambda sonds pop up. Apparently before I bought the car, they got changed and it looks like they didn't do a good job. Since they measure the richness of the fuel/air mixture, those being bad could mean the engine computer is trying to compensate and does not know what to do.

Could it be that? Has anyone had this kind of issues ?

Thanks in advance
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