Discussion
Vehicle
07 bmw 318D 2.0 E90
So the vehicle idles rough as fook, splitters and knocks when revved. A bit of grey ish smoke.
So initially I'm thinking easy, timing jumped.. I'll throw an engine in. So check it over out of courtersey and get a fuel pressure sensor low circuit fault.. so this shows an open circuit. Checked wiring and getting correct voltage and reference voltage at sensor. Plugged in my cheap ish diag device and also a laptop elm one and neither will show me rail pressure.
So now I'm thinking, is the sensor knackered, but usually it would still run in limp mode without it, rough but not this rough. So possible sensor and HP fuel pump, again common.
So I want to know, is there an easy way to check timing on these engines? ???
I've not ruled out engine still as I sprayed easy start in to the intake to hear it run up a little but it didn't work at all, ended up cutting out.
If timing check isn't gonna be that straight forward I guess I can do a compression check...just hoping you guys might know of an easy method to check timing.
07 bmw 318D 2.0 E90
So the vehicle idles rough as fook, splitters and knocks when revved. A bit of grey ish smoke.
So initially I'm thinking easy, timing jumped.. I'll throw an engine in. So check it over out of courtersey and get a fuel pressure sensor low circuit fault.. so this shows an open circuit. Checked wiring and getting correct voltage and reference voltage at sensor. Plugged in my cheap ish diag device and also a laptop elm one and neither will show me rail pressure.
So now I'm thinking, is the sensor knackered, but usually it would still run in limp mode without it, rough but not this rough. So possible sensor and HP fuel pump, again common.
So I want to know, is there an easy way to check timing on these engines? ???
I've not ruled out engine still as I sprayed easy start in to the intake to hear it run up a little but it didn't work at all, ended up cutting out.
If timing check isn't gonna be that straight forward I guess I can do a compression check...just hoping you guys might know of an easy method to check timing.
Fair enough. The tool I have is low to mid range. Was about 80 quid as reads abs srs etc too, but when I go in the live data on the beemer it gives very very basis, map, rpm blah blah... But no fuel rail pressure data, which I thought unusual but then maybe bmw just make it awkward?
There's a few scanners on eBay listed specifically for bmw... inpa k+dcan obd reader... anybody have amy experience with these?
I bought the car described as needing an engine but the trouble code threw some doubt on that. So not condemning it yet.
I've bought a sensor and gonna fit that at the weekend and see what happens...even if it doesn't fix it hopefully it can help confirm a potential hp pump failure if i can get some live data from it.... or if low pressure at least hook up my leakoff tester to the injectors to see what that tells me...
And if there's no way of doing a quick check on the timing ill have to pull out the compression tester for some peace of mind... will need to check my universal diesel com tester has the right fitting mind.
There's a few scanners on eBay listed specifically for bmw... inpa k+dcan obd reader... anybody have amy experience with these?
I bought the car described as needing an engine but the trouble code threw some doubt on that. So not condemning it yet.
I've bought a sensor and gonna fit that at the weekend and see what happens...even if it doesn't fix it hopefully it can help confirm a potential hp pump failure if i can get some live data from it.... or if low pressure at least hook up my leakoff tester to the injectors to see what that tells me...
And if there's no way of doing a quick check on the timing ill have to pull out the compression tester for some peace of mind... will need to check my universal diesel com tester has the right fitting mind.
Yes
M47N2 I believe.
I'll look at doing a leakoff test at weekend then.
If an injector is going nuts that would also explain why it was cutting out when easy start was introduced.
Need to put the rail back on first though. And got a new pressure sensor on the way.
Are they programmed on bmw?
M47N2 I believe.
I'll look at doing a leakoff test at weekend then.
If an injector is going nuts that would also explain why it was cutting out when easy start was introduced.
Need to put the rail back on first though. And got a new pressure sensor on the way.
Are they programmed on bmw?
Yes I'm getting the correct voltages at the plug.
The pin number though would be useful so I can double check still If the new sensor doesn't start showing me rail pressure.
If timing chain had failed though I'd still get rail pressure. As the vehicle engine runs, albeit rough as fook, but it runs which means there is some compression and some fuel being injected. And if its running it must be turning the fuel pump pulley and these aren't timed as from as I'm aware so should general rail pressure all the same.
The pin number though would be useful so I can double check still If the new sensor doesn't start showing me rail pressure.
If timing chain had failed though I'd still get rail pressure. As the vehicle engine runs, albeit rough as fook, but it runs which means there is some compression and some fuel being injected. And if its running it must be turning the fuel pump pulley and these aren't timed as from as I'm aware so should general rail pressure all the same.
helix402 said:
New Injectors need the no inputting to the DDE on the M47. Chain failure is very rare on the M47.
I know with a lot of diesels the number is basically for fine tuning injection. So not programmed would still run, but a bit lumpy until fuel trims can adjust.Is it the same with bmw or will I find a no start condition if the codes don't match up?
bearman68 said:
I need a reg number - PM me if you want.
I'd be tempted to crank the engine with the multi meter attached - should rise to 1.0 or 1.2v. Once you have this voltage, that enables the ECU (DDE) to fire the injectors. Lower than this and the DDE will inhibit injection. It will normally need to crank over circa 250 rpm before the injection will fire as well.
Just mailed you mate. ??I'd be tempted to crank the engine with the multi meter attached - should rise to 1.0 or 1.2v. Once you have this voltage, that enables the ECU (DDE) to fire the injectors. Lower than this and the DDE will inhibit injection. It will normally need to crank over circa 250 rpm before the injection will fire as well.
Thanks in advance. Definately need to investigate rail pressure fault. Whether it's the cause of all my issues or not I don't know, probably isn't. But Hard to diagnose engine or fuel system properly if this is flagging up. Hopefully the sensor will sort it, otherwise will have to chase wiring and module. The sensor fault code is a pending one though so definately not helping
Ok
Fitted pressure sensor and the fault code isn't coming back. Still not getting fuel pressure on my device so waiting for a cheap inpa bmw cable to arrive.
Done a compression test. Around 240psi per cylinder. So pretty good.
Tried to do an injector leakoff test but had to abort after about 20 seconds as noticed fuel coming out of the leakoff pipes which had been removed for the test!! Not worked on many bmw but found the highly unusual!!! Done loads of leakoff tests and disconnected there shouldn't be any fuel flowing this way as they are merely return pipes from injectors!! Anybody seen this?
As it stands I'm not sure what's up but it seems likely something to do with the fuel system.
Fitted pressure sensor and the fault code isn't coming back. Still not getting fuel pressure on my device so waiting for a cheap inpa bmw cable to arrive.
Done a compression test. Around 240psi per cylinder. So pretty good.
Tried to do an injector leakoff test but had to abort after about 20 seconds as noticed fuel coming out of the leakoff pipes which had been removed for the test!! Not worked on many bmw but found the highly unusual!!! Done loads of leakoff tests and disconnected there shouldn't be any fuel flowing this way as they are merely return pipes from injectors!! Anybody seen this?
As it stands I'm not sure what's up but it seems likely something to do with the fuel system.
Yes I've run it without it plugged in, also without the manifold on and map unplugged
Unplugged each injector and no4 makes no change in engine tone. No slight change in tone and other two noticeable change in engine tone.
If it was a single injector (no4) though I'd have thought the knock sensor would throw a code up for it.
I did remove the injector though to have a look and if anything it looked clogged but that would result in excessive pressure rather than poor pressure.
Might see about replacing the injector anyway before looking at condemning the pump. Although before that I really need to hook up the bmw cable to get proper live data readings
Unplugged each injector and no4 makes no change in engine tone. No slight change in tone and other two noticeable change in engine tone.
If it was a single injector (no4) though I'd have thought the knock sensor would throw a code up for it.
I did remove the injector though to have a look and if anything it looked clogged but that would result in excessive pressure rather than poor pressure.
Might see about replacing the injector anyway before looking at condemning the pump. Although before that I really need to hook up the bmw cable to get proper live data readings
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