20 Most Recent 2005 Volvo S40 - Page 6 Questions & Answers

A whistle is a hard thing to figure out, mainly because the tiniest hole can make a sound, even one that cannot be seen. I a a like problem with my intake manifold, I finally found it by carefully using starting fluid in small localized area along the manifold and when I found the hole the engine rpm came up then back down, but I could not see the hold even with a magnifier glass. So am not sure how to give you any ideas on how to check to find a hole you cannot see in your case, but I know even a antenna on your car can if bent slightly will also whistle on some models (this is why some antennas have a small wire wound around the main shaft, to break the wind passing the antenna.) Good luck on figuring this one out.

P0303 is a misfire on cylinder 3 - check the ignition and injector on that cylinder. P0171 means engine is running lean (probably related to the above).Start by checking the tune of the engine, verifying with a timing light that all cylinders have spark. Since these are coil over plug, swapping cylinder 2 with cylinder 3 should result in P0302 in addition to P0303 DTCs being set. If there's a problem with the VVT (Variable Valve Timing system) then there should be a DTC associated with that as well.If you have spark, then it goes on towards a faulty injector. If both spark and fuel are present, it's possible that the VVT (Variable Valve Timing) system is freewheeling cylinder 3. Usually that implies the hydraulic lifter seals are faulty though there should be a noticeable valve tap at idle.In any case, testing out ignition then fuel then ruling out VVT-related issues should resolve the problem completely. I have seen many of these have problems with the plumbing to the valve lifters getting clogged and that results in a dead cylinder.

Won't turn over or won't start? If it won't start - chances are good the oil must be changed and the glow plugs looked at. Need more information on this - specifically, does the engine attempt to run at all? Any DTCs?

first check your compression if that checks out have your alternator tested it can cause the engine not to start

ill bet the wires are crossed

Do you have the remote, i.e. The deadlock system is activated and deactivated using the remote control key fob, which allows the driver to open the car as they approach. It seems you have activated the steering lock which is for preventing thieves to make a getaway. Use the remote to deactivate it and then try starting the car.......sodeep
P.S. The security system is a built-in feature of this model

This sounds like a fuel pump issue. The system should be tested for fuel pressure and then repaired accordingly. Let me know what else you need.

and the problem is.....

Usually about 1800-2200 rpm