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GETTING MISFIRE COUNTS ON ALL CYLINDERS AND CODE 4201. CATS BEEN REPLACED AND ALL COILS.

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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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What is the next step that i should do to find problem with my 2009 sebring to find the cause of this misfire?


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I have a misfire no engine lihgt


What sort of testing was done to look for the misfires?

How was it done & the results?

Why was the injector replaced,was that one problem
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You have no vehicle or motor shown

No mention of scan tool data
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Don't need MIL Lamps on the dash to have a problem

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The whole approach to solving your vehicle was wrong

I would have done a cylinder leak down test to check engine
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Next, new spark plugs & at least the back 3 coils,
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Some what similar with a 4 cyl

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Those trucks have leaking injectors some times, but that isn't
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