M5 Acceleration Leaks

[Richard-M5-E34-94]

Hi Folks !

Iam new, happy eastern !
My english is not that good cause iam german but i will try....

OK.: A few guys of you have almost the same problem, jerky accelaration (if i understand the postings right).

I have the following symptoms:

My car has a chip that "breaks" the Speed-Signal to the DME, so its going about 270 KM/h...which you can drive in germany on the autobahn...:-)

If i accelerate my car over 5800 RPM the engine SUDDENLY "feels" like loosing 10 % power. If you drive off the highway moving the car in town and you come to a stop on a trafficlight, the engine idles very nervous. It feels like a spark-plug is not running weel, like the car is ideling on just 5 Pots.

Whne the Traffic goes green and you accelerate, it comes about 1500 RPM to a "Plopp-Feeling" and it rund smooth and normal again.

Driving 3-4 Days in the city without accelarating over 5800 RPM, the problem disappears and the car runs smooth in every situation, like something "comes down" to normal...funny heh ?

Ia have a Service-date on 08.05.2000 at my BMW-Garage and they will do everything to solve this problem.

My Lambdasond is causing error-messages in the DME (OBC) and was resettet a few times, problem stays. They changed the lambda, cleaned the injection, changed the spark-plug (ago 10.000 KM) changed the Fuel-Pressure-Valve and so on...Problem stays.

Now they wanna check the Error-Codes detailed.

Now my thoughts (Questions):
Is the problem caused by an error in the "lambda-way" (cables, plugs etc) or is it maybe caused by bad spark-plugs or a fuel-pump that is going to die shortly and causing the lambda to record errors cause it can adjust against wrong values from the broken part (sparks or whatever ) ?

Any hint ?

Cause few of you have same probs, i will going to tell if BMW fix it, what it was.

Any hints BEFORE my date at BMW, that i can tell them to look for, so i can save money for just searching the mistake ?..:-)


Hope you understand, cause i didnt know some words..

Bye, Richard

[Ben]

My 91 3.6 liter was having a similar problem last December. I could not specifically say at what RPM it would 'lose' power as it happened all over the place -- so your problem may be different.

The problem was a small crack in one of the spark plug wires. I replaced the loom and the power was back. Not a cheap fix though. You may want to have your mechanic try and pinpoint that as the fault before purchasing a whole new loom.

Hope that helps!

- Ben

[Chris]

If you have a modul for the speed limiter, disconnect it, if you have a reprogrammed ECU, change your control unit witha a stock one and try again. Looks like a problem from that side.



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///Chris

[Richard-M5-E34-94]

Hi Chris !

Tnx for your reply, but the "P-Box" is very simple, its not an "intelligent" p-box. Its only telling the ECU (starting from 240 KM/h) that the car is driving 240 KM/h - not more... But the behaviour is also below 240 KMh and the p-box is totally inoperative below that speed. AND! it was working for more than 6 month with the speed-limiter-box, so the problem must another one ?!

Bye, Richard

Originally posted by Chris:
If you have a modul for the speed limiter, disconnect it, if you have a reprogrammed ECU, change your control unit witha a stock one and try again. Looks like a problem from that side.

[Chris]

Belive it could be the box. We had this on a 750 and other cars. Disconnect it and check again.

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///Chris

[Richard-M5-E34-94]

Hi Folks !

Its done, the problem is fixed, i was in the BMW-Garage and they found "it (4 reasons).

In my IT-Admin-Life i have found out one thing: If a Mistake is hard to catch...it isnt one, there are more mistakes...thats why tracing the fault is so complicated.
Same with my car....

OK, for you all with idle and performance-problems:

The rough idle was...****...iam german, dont know the english terms.

The Bag on the big "Air-Thing" from the injection was broken, so air was coming into the system where air shouldnt be..here in germany they call it "Nebenluft".

The "Leerlaufregelventil", maybe its called "idle-valve " ? was broken.

The additional air-pump for the catal. was broken

and finaly:
The "Verteilerkappe und Finger"....thats the thing, where this little electric-finger is rotating to serve the sparks...i thing its calles rotator-distributor, and the bis orange(brown) cap on it was also broken

ANNDDDD......THE LAMBDA !!!
They told me, they fixed it ago 6 Month, BMW was telling me, it could be, but in fact of that the lambda was always adjusting at maximum, caused by the other fault-by theyre wrong air/gas balance, the lambda broked again.

Now everything is fine.

It was NOT THE BOX....like ive told before, cause this box is doing NOTHING below 240 KM/h.


Thank you all for your help !!!!!!!!!!

CU, have fun
DRIVE CAREFULLY !

Richard, Germany

Originally posted by Chris:
Belive it could be the box. We had this on a 750 and other cars. Disconnect it and check again.

[GERI]

Hallo Richard

Hast du eine E-Mail Adresse habe einige fragen an Dich betreffend dem Problem mit Leistungsverlust. Habe ebenfalls einen
E34 Jg. 1993 mit 3.8L Motor und habe ebenfalls das Gefühl nicht mehr über die
volle Leistung zu verfügen.

Meine E-Mail Adresse findest du in meinen
Details.

Besten Dank für Deine Antwort.

Gruss

Geri

[Chris]

Richard,

just two things:

I did not say it IS the box, i said it could be the box. Also why does the box not influence the engine above 240 km/h when your car has a top speed of 270 now?

You didn´t told me that your engine is in such a poor state and that common things are not checked.

Und hier nochmal in Deutsch:

Ich habe nie behauptet es IST die Box, ich sagte immer es könnte die BOX sein. Außerdem wie kann es sein dass das Modul über 240 km/h nichts mehr bewirkt und Dein Auto 270 km/h Höchstgeschwindigkeit hat?

Ich wusste nicht das Dein Motor sich in einem so jämmerlichen Zustand befindet.
Offensichtlich hat dieses Auto in letzter Zeit keine vernünftige BMW Werkstatt von innen gesehen.

Also hier gilt, je mehr Info´s wir vorab bekommen, desto besser können wir helfen.

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///Chris

[Richard-M5-E34-94]

Hi Chris !

Ich meinte, daß die Box ÜBER sondern UNTER 240 KM/h nichts tut...sonst würde ja in der Tat nichts mehr über 240 KM/h passieren....:-)

HEy hey ! Mein Motor befindet sich nicht in einem jämmerlichen Zustand, er hat mich lieb....:-) Nein, der Meister, der bisher für M-Fahrzeuge bei meiner Werkstatt zuständig war, ist in die Hauptniederlassung gewechselt. Das ist 2 Jahre her. Seitdem habe ich zwar immer meine Werkstattbesuche gehabt, aber die anderen Meister dort waren wohl faul oder blind.

Ich verlasse mich natürlich auf die, somit merkt man solche Fehler erst, wenn sie sich bemerkbar machen.

Ich hege und pflege mein Fahrzeug von innen und außen, meine Freundin sagt schon, ich habe ne Macke... Deshalb habe ich ja auch SOFORT nach Feststellung der Fehler die Hauptniederlassung mit "meinem" M-Spezialist aufgesucht, dieser hat ja auch alle Fehler gefunden und repariert.

Es wurmt mich perönlich man könnte jetzt denken, ich pflege mein Auto nicht, deshalb ist mir die Feststellung wichtig, daß mein Auto im einwandfreien (jetzt wieder) Zustand ist und ich persönlich gar nicht schlafen könnte, wenn das nicht so wäre...:-)

Ich habe ne Macke ne ?

So war ich schon immer mit meinen Autos...

Danke Dir trotzdem für Deinen Rat !

Viel Spaß !

Richard

And now in English:

Hi Chris !

I ment, that the Box is inactive BELOW 240 KM/h not ABOVE…otherwise the car would do nothing above 240 KM/h in fact...:-)

Hey Dude !!: My Engine is NOT in a poor state, he loves me…I love my engine.....:-)

The thing is, the “Crack” for the M-Vehicles left this garage and moved to the Main-garage of BMW in our city. That was ago 2 years. Since then I always go regulary to the garage, but the Mechanics left where blind or simply rotten…lazy.

I rely on them, I thought every time I left the garage “everything is fine…otherwise they have told me”.

I am only able to recognize faults when they appear ! Like happened….

I am a really psycho....i am driving my girlfriend nuts when it comes to my car...:-)

I put glaze on it every 8 weeks, I wash it with all inside and outside, I take care of all parts, inside AND outside…drive to the garage for every little bulb….simply mad he ?

When i realized the engineproblems i IMMEDIATELY moved to “my old Crack-Mechanic”, to the headquarter of BMW. And he fixed the problems..all.

It makes me nervous and sick imaging others could think now, I don’t take care with my car. Therefore I have to say very clear, that my car is (now again) in a superb state…and I couldn’t even sleep it it is not that way…...:-)

I am crazy, am i ?

I always have been that with my cars...

Anyway, a big tnx for your help (and the rest of you guys)

Have fun !

Richard

Originally posted by Chris:
Richard,

just two things:

I did not say it IS the box, i said it could be the box. Also why does the box not influence the engine above 240 km/h when your car has a top speed of 270 now?

You didn´t told me that your engine is in such a poor state and that common things are not checked.

Und hier nochmal in Deutsch:

Ich habe nie behauptet es IST die Box, ich sagte immer es könnte die BOX sein. Außerdem wie kann es sein dass das Modul über 240 km/h nichts mehr bewirkt und Dein Auto 270 km/h Höchstgeschwindigkeit hat?

Ich wusste nicht das Dein Motor sich in einem so jämmerlichen Zustand befindet.
Offensichtlich hat dieses Auto in letzter Zeit keine vernünftige BMW Werkstatt von innen gesehen.

Also hier gilt, je mehr Info´s wir vorab bekommen, desto besser können wir helfen.

[Chris]

may be you should go to www.bmwm5.com/chris.htm to see what´s really going on out there...

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///Chris

[Richard-M5-E34-94]

Hi Chris !

I dont understand ?! I followed the link, but i knew the page already.

Great performance, but the look (colour,stripes etc) is not my kind...

I like cars, looking undangerous...but if you hit the accel....thats called "understatement" here in germany and is great to get all those "semi-fast" cars getting theyre eyes wide open..:-)

Hear you !
Richard

Originally posted by Chris:
may be you should go to www.bmwm5.com/chris.htm to see what´s really going on out there...

[Richard-M5-E34-94]

Hi again !

But i saw your second page, the M5 E34 in Daytona Violett..THIS ONE I LIKE !!

But you wont sell it...:-(

Bye, Richard