Having problems with your 2001 Volvo S40 ?

Check engine light is always on, when cold start the engine runs very rough and has to be warmed up fully before there is no danger of it stalling when in gear. From idle to 1500 rpm the engine runs very rough, after 1500 rpm it is much smoother, spark plugs are darker than they should be, have new coils, plugs, plug leads, airflow meter, temp sensor, throttle position sensor, none of this made any difference, compression is good and fuel pressure is good, any ideas??

Posted / edited by AnonymousUser on : 15-01-2018

Answers :

\012I think you should go to ur nearest Volvo service shop and have them check ur ECU for proper and accurate scanning of problem in the sensors and switches.\012
\012Hope that helps u out!
It could be the catayltic converter, the exhuast is not pushin as much.my car does the same my mechanic says hes almost sure its the CAT, if anything let your mechanic look at it for proper diagnostics, get the scanner and scan the computer and get the code, then google the code to see what could be causing it. auto zone scans it for free
Repair Help & Product Troubleshooting for 2001 Volvo S40

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Check engine light is always on, when cold start the engine runs very rough and has to be warmed up fully before there is no danger of it stalling when in gear. From idle to 1500 rpm the engine runs very rough, after 1500 rpm it is much smoother, spark plugs are darker than they should be, have new coils, plugs, plug leads, airflow meter, temp sensor, throttle position sensor, none of this made any difference, compression is good and fuel pressure is good, any ideas??

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