BMW 525tds

For copyright infringement and removal of materials -

Keywords: bmw questions, bmw,e39,ecu,egr,hot,mph,rev,boot,cars,bore,justanswer,questions,just answer,answers,bmw

Description: Question - BMW 525tds i have 99 e39 bmw 525tds and im after changeing - Q0. Find the answer to this and other BMW questions on JustAnswer.

Experience: Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing

I'd start by checking the connections to the EGR valve, if either the vacuum pipe of electrical connection are damaged / corroded then the EGR can be on all time which certainly will hurt performance. Its also possible that its a fault with the EGR valve so its worth removing the valve and cleaning it out with brake cleaner, if it looks particularly clogged then replace it.

If this is OK then check the small vacuum lines to the turbo and its connected control solenoid on the bulkhead, any cracks or leaks can give turbo issues and its best to have the boost pressure measured to check that the turbo is healthy

Also worth checking that the glow-plug relay is switching off as they can stick on and leave the glow plugs also on - on some cars this can force it into limp home

Also worth considering a bottle of injector cleaner into the tank as a clogged injector nozzle will reduce power and give poor combustion - the next stage on from this is to remove all the injectors and have them ultrasonically cleaned and flow checked

If the above are all OK then try checking for airleaks after the airflow meter, any air dragged in here isn't 'seen' by the ECU and so not compensated for and leans the engine out causing rough running.As its a mechanical fault it tends not to turn on the fault light and you can sometime hear a 'hissing' noise with the engine running.

Check the hose clips for tightness and inspect the trunking for any cracks or splits and also all the vacuum system, the small bore pipes and fittings for cracks and missing parts.

The best way to locate a leak is to have the engine running and warm and then spray lighter gas around each joint in turn. If the engine rev's up you've found your leak.

Work your way through each possible joint one at a time and you should find it. I use a slightly flattened piece of brake pipe and some rubber hose from the can of lighter gas to provide a spraying 'wand' and allow a direct blast of gas into each area, especially those difficult to reach with large implements.

Photogallery BMW 525tds:

BMW 525 tds technical details, history, photos on Better Parts LTD
BMW 525tds (E34) | Karburátor
BMW 525 tds technical details, history, photos on Better Parts LTD

BMW 525 tds
V-MAXX | Show your ride | Bmw | 525tds e39
BMW 525tds

BMW 525 tds #
V-MAXX | Show your ride | Bmw | 525tds e39
Bmw e34 525 tds

BMW 525tds: Photo gallery, complete information about model ...
Vehiculos ocasion Turismos · Vizcaya · NORTE VIZCAYA AUTOMOVILES ...
BMW – 525 tds TOURING E34 por 2.290 Euros | motor brokers

bmw 525 tds e39 |
BMW 525 TDS ~ allcarspict
Buying A 1997 Bmw 525 Tds (e39) - Team-BHP

E34 meeting in May! - E34 1988-1996 - BMW 5 Series Owners Board
BMW 525 tds :: 1 photo and 54 specs ::
Bmw 525 Tds E34

BMW 525tds Touring | Top Car Guide
Bmw e34 525 tds
Bmw 525 Tds | Beautiful Scenery Photography