LH Injection Controller Repair
Thread Starter
Addict
Rennlist Member
Rennlist Member
Joined: Jul 2002
Posts: 2,693
Likes: 52
From: AZ
LH Injection Controller Repair
I'm passing on a message from a German 928 owner ....
Rich
---------------
I think this message could be important for any S4, GT, GTS driver. These cars use the Bosch LH-Jetronic fuel injection controller.
After 10 to 15 years lifetime the first controllers are beginning to stop working correctly. One reason for this is the Hybrid-chip which is no longer available. A new controller is more expensive than 2000 € (Euro).
PFForum-members [a German language forum similar to Rennlist] wrote about a company (ACM Elektronik) which is able to repair all controllers. This information comes from a discussion with Mr. Müller from the ACM Elektronik company:
If you have problems with your LH-controller, possible symptoms are:
- The fuel-injector-valves are ticking if ignition is on.
- If you remove your foot from the accelerator, the revolutions are higher than 2000 rpm and the car is coasting, the fuel-calculator didn´t show 0,0 litres/km.
- No smooth idle
- Air/fuel-mixture: too rich
- The engine won’t run at higher than 3000 rpm
- Automatic Transmission: no RPM regulation when switching from "D" to "N" or "P".
- Engine doesn´t run. The Spark plug is dry and is sparking.
Mr. Müller changed the original EPROM with a check EPROM and tests all
functions with his own software. He said he knows the controller like he build it by himself. Electronic components which are often fail the would be changed as part of the service.
The price for checking a controller is 50€ plus shipping.
--------------------------------
Firma ACM
Herr Müller
+ 49 69297 929462
email mueller.acm@t-online.de
--------------------------------
Rich
---------------
I think this message could be important for any S4, GT, GTS driver. These cars use the Bosch LH-Jetronic fuel injection controller.
After 10 to 15 years lifetime the first controllers are beginning to stop working correctly. One reason for this is the Hybrid-chip which is no longer available. A new controller is more expensive than 2000 € (Euro).
PFForum-members [a German language forum similar to Rennlist] wrote about a company (ACM Elektronik) which is able to repair all controllers. This information comes from a discussion with Mr. Müller from the ACM Elektronik company:
If you have problems with your LH-controller, possible symptoms are:
- The fuel-injector-valves are ticking if ignition is on.
- If you remove your foot from the accelerator, the revolutions are higher than 2000 rpm and the car is coasting, the fuel-calculator didn´t show 0,0 litres/km.
- No smooth idle
- Air/fuel-mixture: too rich
- The engine won’t run at higher than 3000 rpm
- Automatic Transmission: no RPM regulation when switching from "D" to "N" or "P".
- Engine doesn´t run. The Spark plug is dry and is sparking.
Mr. Müller changed the original EPROM with a check EPROM and tests all
functions with his own software. He said he knows the controller like he build it by himself. Electronic components which are often fail the would be changed as part of the service.
The price for checking a controller is 50€ plus shipping.
--------------------------------
Firma ACM
Herr Müller
+ 49 69297 929462
email mueller.acm@t-online.de
--------------------------------
Burning Brakes
Joined: Jan 2003
Posts: 773
Likes: 0
From: Minneapolis MN
Sounds like this guy has a cottage industry waiting ot bloom. Lots of cars use the LH, including the Dodge Daytona I had when I was 22. I'm 41 now...
The chips in LH's are digital I assume, and thus have the ageing issues of dopped circuits. As they age, they "drift". The L-Jet is analog and thus is less apt to do that.
The 928 is a fantastic example of old-school and new-age electronics. Relays and Mosfets living together...- Ruf
The chips in LH's are digital I assume, and thus have the ageing issues of dopped circuits. As they age, they "drift". The L-Jet is analog and thus is less apt to do that.
The 928 is a fantastic example of old-school and new-age electronics. Relays and Mosfets living together...- Ruf
