VolvoS70 Hesitation

[MartinO]

Hello all,

 

I'm trying to work through a hesitation problem with my 2000 S70 non-turbo.  When I start the car and drive for about 10 minutes all is fine and then the problems begin:  After the warm up and a few miles when driving along at constant speed the car surges just a little and then on acceleration it hesitates until I push accelerator more and then it gets on with the acceleration fine.  No idle problems at all...its just when the car is at constant speed going into acceleration when problems arise.

I initially changed out MAF sensor and plugs before my mechanic looked at the car.  He cleaned the throttle body so far and is saying the next step would be new ETM.

I'm seeing a lot of discussion on bad ETMs but I'm not seeing any others having situation where car is fine when cold.

I will probably take it back to him tomorrow but was just wondering if anyone else knew of this problem.

 

Thanks all for any help.

[Midnight Caller]

Oxygen sensors (lambda probes) could also give this kind of behaviour.

[MartinO]

Ok thanks.  That never occurred to me so will take a look at those also.

[Ihatespeedbumps]

Do you have any DTC's stored?

[MartinO]

As a precaution I took the car into a 2nd shop have those read and they are indicating bad ETM also.  I took the unit out and shipped to Xemodex and will get that back today and will hopefully be happily back on the road this evening! Nice people they are at Xemodex.