Hot start problems with M54 3.0i Automatic ( Fault code P1632)

Ferdinand

Ferdinand

Zorg Addict
Joined
Jun 16, 2012
Points
54
Location
Denmark
Model of Z
Z3 3.0iA Sport Edition
Hello everyone - very long time, since I was last here.... Too much work and too many cars/ activities to attend to all the time....

Before I book a session with my local stealer, I would like to hear, if someone has a good idea on what I should look at with my car.

Problem 1: She starts just fine when cold
Problem 2: She needs to have a bit of throttle when warm - it's as if she doesn't get enough fuel... once she's running everything is fine, she accelerates/ decelerates, idles and runs just as normal - "only" problem is getting her started.... ;o(

I changed the throttle body some time ago - old one went dodgy, and some people told that I could do the reset myself: Put the key in position 1 for ten seconds, then turn it of, and then into position 3 (starting the engine) - then everything would be fine.... - but i did not do the trick unfortunately.
I've only used the car for maybe 7 times, since the TB was changed, so It hasn't been much of a problem really.
Problem is, that in the oncoming weekend the missus has booked a lovely stay at a Castle for us... and I would really prefer the car "to behave" at such a nice place.....

Spark plugs are almost new, She'll get an oilchange, done by myself this week....

What to do - book a session at a stealer, and "hope for the best" ?????
 
My gut feel @Ferdinand would be to get the codes on the car read, this will at least let you know if the car thinks it has a problem.

When you changed over the TB, what condition were your rubber hoses in? the age of our cars now means that the original rubber is now very brittle, this leads to holes in the air intake and unmetered air in to the system etc.
 
The hoses were ok - but i'll check Again - just to make sure they're all honky-dory.... Have booked a session this thursday -

I'll post outcome later on ;o)
 
Hey! There is a very long thread on this very same subject so search the forum. I think it ended up being a fuel sensor canister thingo that was detecting that the car was still cold and messing up the fuel delivery. have a look!
 
Time for an update:

Had the car booked in for a session with the local dealer yesterday... It was an old mechanic, who had been away from the trade for about 10 years.. "I've been out, taking care of kids", he laughed. "But with only 3 years left before I can retire.. I missed working on cars . so here I am... back working with lovely BMW's again". He had there for 28 years, before he left....

Anyway, he started talking about old days, and problems with E36, E39 og E46... they used to have problems with some relays and connecters between gearbox and engine, and ECU etc., and I'd really love to check those he said.
My response was: Well I'm paying for your expertice, so knock yourselves out.. He checked all kinds of things, but found nothing - then he connected the car to their computer and... wow.... all kinds of weird fault codes turned up... They all looked, and said: That's not good......

Let's just say, that I wasn't feeling all kickin' and ready for fun....... :depressed:
I asked, what can we do... Could we make a print of those, and "reset" everything, and begin from scratch... well if that's what you want - we could try that.... They explained that many of the codes could be from low voltage whilst the car is in winterstorage..... well that's sorted with a CTEK-charger since ever, I replied.... :D

Anyway - codes was reset - we went for a spin - hooked it up again :bookworm: - and no codes was present..... :pompus:
I went home.... and this morning, the frekin' car did the same again.... ARGHHHHHHH! :arghh::banghead::arghh::banghead::arghh:

One of the last thing's, the mechanic gave me as an advice was: Buy some injectorcleaner: Belladd 1B - as they had seen some cars with only periodic use having leaking injectors - and they were "fixed" with a shot of injectorcleaner into the fuel - so that's next... :nurse:

But tomorrow - we going away for a long weekend, and the car has been told to behave :rage:

More to come, as more have been tried / problem solved :nailbiting:
 
Last edited:
@Ferdinand did you fully read the link that I sent to you above? Did you test it to see if you have the same issues with air rushing in when you remove the fuel filler cap? If not I highly recommend that you read the entire post as it may assist. Good luck.
 
Update:

We had a very nice weekend - no thanks to the car... EML, DSC and all sort of lights turned on and off frequently...... Low rev idle, when starting it "hot" etc. It was for sale at a VERY low price on our way home!

Then parked it in the garage and tried to forget even owning the car......

I decided, however to take the car for a spin yesterday - tried to release the fillercap before starting the car - no sound / hissing noise..... Since it was almost empty i filled it up - then took it to a local classic car meeting, which is always very nice....

When I wanted to go home - the darn thing "acted up again" - with very low rew idle, and lots of black smoke coming from the exhaust (unburned fuel) - touched the throttle lightly and it immediately revved up to it's normal idle - and the black smoked disappeared at once.

This morning it started as it's supposed to. I drove it to work (35 km) - and remembered to try release the filler cap again - still no hissing noise/ any sound at all - guess everything is ok with the fuld tank/ canister then - or am I wrong??

Thinking about chancing the temperatur sensor and the camshaft position sensor - and adding the fuel additive - or what are your suggestions?!
 

Attachments

  • 11698901_10207181197518348_8303562348601617522_o.webp
    11698901_10207181197518348_8303562348601617522_o.webp
    48.4 KB · Views: 342
Last edited:
I would try a new battery for the random warning lights just to rule that out and relatively cheap.

You can unplug the MAF to rule that out (if it runs better with the MAF unplugged then something is wrong with the MAF).
 
Battery is les than 1½ year old - bought an AGM battery - besides the car is always connected to a CTEK-charger.

Will try to unplug MAF
 
I would be inclined to read the ECU for the camshaft code as your car is doing almost exactly what mine did as the inlet cam sensor started to fail. It didn't put the EML light on but always manifested itself at start up.

Tony.
 
Ferdinand said:
Battery is les than 1½ year old - bought an AGM battery - besides the car is always connected to a CTEK-charger.

Will try to unplug MAF
Click to expand...

I notice that re the battery but I've had a bad battery before, you can try swapping one from your other car just to see and be sure and rule out the easiest fixes first.
 
Been much too busy.. but here's a small write-up ;o)

Checked all inlet hoses, which are still like new.
Cleaned the throttle body, even though it hasn't been used much - just to make sure it's alright.
Checked and cleaned the DISA valve. Cleaned the ICV, which was actually quite dirty... Not sure, maybe my imagination it playing tricks with me, but it seems like it has helped a bit... But problem still not solved entirely.... more work to be done :woot:
 
Last edited:
Update from yours truly crazy Dane

Haven't used the car much for quite some time.... Because of the hot start problem and almost constant occuring P1632 fault code, which means, that the throttle is useless.... Car only runs in fault mode = 15 miles/hour top speed
headbanger.gif


The other day I was looking for a solution for God knows how many times.... And finally found something on the issue from no other than BMW themselves:
http://www.bimmerfest.com/forums/attach ... 1219084451

It turns out, that the problem is a well known problem om cars with M54 engines.... Since I had already replaced the Throttle Body Assembly, the next thing is to replace the entire engine wiring harness..... So I ordered a new one from my local stealer, and changed it today.... Holy cow.... I was worried during the proces, but I'm used to fixing all kinds of jobs/ issues on my cars, so I thought that I would do this myself.... Fired up the engine afterwards, cleared the fault code from its last run.... But it actually seems..... Dare I really say/ hope it out loud.... that the problem might be gone now.....

Will let you know.... I really miss driving the car, but lost patience and almost my love for it, because of not knowing whether it would start/ run when I needed it....
 
Last edited:
Thanks for the update, it does boil the blood a little when you read from official documentation "Correction, on customer complaint basis only"

Well done for finding this.
 
Believe me.... I went almost ballistic when I read it..... And furthermore.... The dealer said... We've sold several of those wiring harnesses.... And then I thought... Why the heck didn't you say that when you had the car in the workshop last year..... Anyway.... Hope things are ok now.... But at least I can rule the TPS and wiring out now
 
You must log in or register to reply here.
Back
Top