ch1ll1
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| posted on 28/10/06 at 01:43 PM |
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any bmw freaks on here?
hi all
a friend of mine has a e36 325i auto
with a silly problem !
whilst driving along , it seems to lose all power, you press the loud pedal and it helps a little, then stutters and stalls etc,
done a code read got LAMDA SENSOR, also battery voltage, check battery ok,
so stripped it all the plug was full of water,
great i thought, so fitted a new lamda, dried the plug
test run it, still the same, so removed the plug from lamda, drove the same,
also when its jumping around the rev counter goes right round to max and then jumps around !
checked charging ok,
might be a faulty charge regulator
any ideas ?
cheers paul
[Edited on 28/10/06 by ch1ll1]
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ed_crouch
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| posted on 28/10/06 at 02:19 PM |
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Ermm, Im no expert, but if it thinks the Lambda probe is knackered, it might be either:
The sensor: nope!
The wiring: possibly...
The engine ECU:possibly...
The Bosch Motronic systems have a get you home mode for when the engine sensors give up the ghost. The ecu detects that the sensor data has gone out
of range, and substitutes its own default (ballpark!) value. It will run, but will drive like a bastard, probably with lots of black smoke and
misfiring. It could be a wiring issue as I bet the lambda probe wiring runs close to the hot exhaust...
If you can get a Haynes book of lies for the car, check out which ecu pin the lambda probe signal connects to (dunno whether its a 2, 3, or 4 pin
probe). They normally kick out about 1 volt, any variance from 1 volt is interpreted by the ecu as a mixture error, and in its normal course of action
it varies the injector durations to continualy optimise the mixture, and hence drive the lambda signal back towards 1 volt.
Or you could check the continuity of the probe wiring with a muttly-meter.
Just my tuppen'orth
ED.
I-iii-iii-iii-ts ME!
Hurrah.
www.wings-and-wheels.net
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ch1ll1
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| posted on 28/10/06 at 02:22 PM |
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this doesnt get you home !
it starts ok, hunts, try to drive it some times stalls, or if it does drive theres no power, clocks go stupid ( like electrical )
but it runs the same with lamda off !
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mark chandler
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| posted on 28/10/06 at 02:38 PM |
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Maybe the CATS melted down, that would allow it to start but screw everthing else except for the clocks losing it.
Mate at work had a 528i, going fine then died on the way home.
You can tell if its stuffed by pulling off the air filter and seeing if you get a decent vacumn when you rev the engine, with a blocked/melted Cat the
gases have nowhere to go so it will only draw a bit.
Regards Mark
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ch1ll1
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| posted on 28/10/06 at 03:20 PM |
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hi not its not the cat
its my job motors,
even a mate of mine called round same trade and he hasnt got a clue ! 
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Guinness
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| posted on 28/10/06 at 04:23 PM |
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I had a similar problem on my 540i auto.
Kept stalling. All engine sensors OK, ecu OK. It would start OK, run for 5 minutes, then stall.
Turned out to be a dodgy fuel pump.
Took 3 garages to find it though!
HTH
Mike
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froggy
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| posted on 28/10/06 at 05:10 PM |
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have a look for air leaks, you didnt say which year the car was but if it has single coil packs then the ecu will stwitch the coils off and cut
injectors to save the cat which might give you the jumpy tacho , worth a look as ive had a couple of m3,s recently which have had a full set of coil
packs fitted to cure a misfire but turned out to be an air leak under the plenum giving a weak mixture and forcing the ecu to compensate, you will
need it up in the air to find it 
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ch1ll1
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| posted on 28/10/06 at 05:43 PM |
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hi sorry its a 1991
1 coil per cylinder
its just like your cutting the power when you try to drive it !
tested all sensors they seem ok
but could be breaking down under load
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pigeon_uk
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| posted on 28/10/06 at 06:01 PM |
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Try a search on google to rule out some of these
Vanos unit if it has VVT (uasully stalls when cold )
Nikasil engine liners
Try cleanning the ICV with carb cleanner
Cleanning the MAF
The above two are worse case, hope it something simple
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ch1ll1
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| posted on 28/10/06 at 06:11 PM |
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already cleaned then
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t.j.
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| posted on 28/10/06 at 07:30 PM |
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sounds like an ignition problem due the Revs-metre.
Look at the secondair part of the ignition.
- Sparkplugs, leads, etc.
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Noodle
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| posted on 28/10/06 at 10:17 PM |
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My Lambda sensor recently went on my 525. It spluttered all over the shop and wouldn't take full throttle. However, lambda sensors are not used
under full-bore and when the engine got up near the red line and the vanos cut in (after much coughing), it went like a scalded cat.
One new lambda sensor later, and all's well.
Cheers,
Neil.
Your sort make me sick
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Hellfire
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| posted on 29/10/06 at 10:04 AM |
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BMW's....
Can't get on the hard shoulder cos of 'em....
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ch1ll1
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| posted on 29/10/06 at 10:05 AM |
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lol
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JamJah
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| posted on 29/10/06 at 02:03 PM |
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Can I make my guess?
"Sounds like its a donor..."
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MikeRJ
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| posted on 29/10/06 at 03:02 PM |
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Crank sensor would be my first guess, given the behaviour of the tachometer.
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chriscook
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| posted on 29/10/06 at 06:49 PM |
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Could be a dodgy tacho signal causing the rev-limiter to cut in. As MikeRJ suggests it could be the crank sensor.
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