Question about Volvo S60
This type of condition can be caused by vacuum leaks at the Intake, use a bottle of propane with a hose attached to the end and spray around the intake manifold, watch or listen for any change in the sound of the engine as it idles, also verify that there are not leaks in the exhaust by doing a smoke test, this involves injecting ATF into the engine through a vacuum hose and watching for leaks in the exhaust, the next test is the fuel pressure, make sure it is at whatever the spec is for your car, most likely about 50-60 psi, if all these tests are negative you need Volvo to hook this car up to a live engine data scanner to see what is going on, they also need to verify that all the software updates for the Powertrain control module (PCM) have been done, the bottom line here is there is no magic bullet fix for problems like this, just careful methodical testing by the book, don't throw anymore parts at this problem, that has proved by the list of parts to be a very bad idea, if you need to get the dealer involved because this is over your head do so, don't use outside shops they don't have the sophisticated test equip required to diagnose this problem, I have been a certified electronic engine control technician on Bosch fuel injection for 30 years, and have tons of real time experience to back up what i am telling you.
Posted on Sep 30, 2009
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Posted on Jan 02, 2017
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