Why does my Porsche 928 not Rev out?
On early 928 models with K-jetronic fuel systems, poor performance and the inability for the engine to rev out can be associated with the CIS (Continuous Injection System) fuel distributor or warm up regulator. In simple terms, the fuel distributor is a control valve that separates incoming fuel to each injector.
How does the fuel pump work on a Porsche 928?
Keeping on track with fuel-related issues, the 928 fuel injection systems uses a fuel pressure regulator and fuel dampeners to control fuel flow to the injectors. The regulator and dampeners have a rubber diaphragm in them, with fuel pressure on one side of this diaphragm and vacuum on the other.
Where is the MAF sensor on a Porsche 928?
Temp II sensor location. 928 models fitted with Lh-jetronic injections systems utilize a mass airflow or MAF sensor to measure the amount of air entering the engine. The MAF is located between the airbox and throttle body. It uses a very fine platinum wire that is electronically heated, but cooled by the airlfow across it.
What to look for in a Ford 928?
One of the first areas to inspect on the 928 when engine performance begins to suffer is the fuel filter and fuel tank. With the 928 creeping up in age and many cars having sat for extended periods of time at some point during their lives, build up in the fuel system can occur.
How to test the engine temperature sensor Porsche 928?
Connect terminals 17 and 21 of the disconnected LH control unit plug. It must be possible to measure the battery voltage between terminal 2 (positive) and terminal 4 (ground) of the disconnected air-flow sensor plug. Was this article helpful?
What kind of spark control does a Porsche 928 use?
The Porsche 928 from the 1987 through the end of production in 1995 used separate Bosch Jetronic LH Fuel Injection and EZK Spark Control modules. The spark and fuel control systems obtain engine speed information from an inductive RPM sensor that connects to EZK module via pins 6 (-), 23 (+) and 24 (shielding).
What does an error code mean on the temperature sensor?
This error code indicates a fault in the area of the air-flow sensor. The engine temperature sensor makes the mixture richer for cold or hot start. In the event of an error, check with reference to the circuit diagram. Checking the voltage supply to the air-flow sensor: Connect terminals 17 and 21 of the disconnected LH control unit plug.
Why is my engine temperature sensor not working?
If these values are not achieved during this testing step, measurement must be carried out directly on the engine temperature sensor. This error code indicates a fault in the area of the air-flow sensor. The engine temperature sensor makes the mixture richer for cold or hot start.
Fuel dampener replacement. On early 928 models with K-jetronic fuel systems, poor performance and the inability for the engine to rev out can be associated with the CIS (Continuous Injection System) fuel distributor or warm up regulator. In simple terms, the fuel distributor is a control valve that separates incoming fuel to each injector.
What kind of maintenance does a Porsche 928 need?
The fact that these lines were not replaced in over 20 years and were expected to work indefinitely isthe problem. Items high on the preventive maintenance list for the Porsche 928 are replacement of the fuel injection lines, power steering lines, and for automatics, the transmission fluid cooling lines.
How often should you replace power steering lines on a Porsche 928?
Items high on the preventive maintenance list for the Porsche 928 are replacement of the fuel injection lines, power steering lines, and for automatics, the transmission fluid cooling lines. If these are replaced every 20 years or so, there is no more likelihood of a 928 bursting into flames than any other car.
Fuel dampener replacement. On early 928 models with K-jetronic fuel systems, poor performance and the inability for the engine to rev out can be associated with the CIS (Continuous Injection System) fuel distributor or warm up regulator. In simple terms, the fuel distributor is a control valve that separates incoming fuel to each injector.
Keeping on track with fuel-related issues, the 928 fuel injection systems uses a fuel pressure regulator and fuel dampeners to control fuel flow to the injectors. The regulator and dampeners have a rubber diaphragm in them, with fuel pressure on one side of this diaphragm and vacuum on the other.
The fact that these lines were not replaced in over 20 years and were expected to work indefinitely isthe problem. Items high on the preventive maintenance list for the Porsche 928 are replacement of the fuel injection lines, power steering lines, and for automatics, the transmission fluid cooling lines.
Is the Porsche 928 a fat or slow car?
Once the 20+ year old parts have been gone over and the fuel lines, electrical systems, ignition system, suspension and drivetrain have been sorted out, the actual operating costs are no more than any other car of the same caliber. Porsche 928s are Fat and Slow. 928s are not slow at all.
What should battery voltage be on Porsche 928?
With the key in the “ON” position, you can read the battery voltage on the dash instrument cluster. A normal reading for a healthy battery should show just about 12 volts on the gauge. Anything less than 12 volts indicates the battery voltage is low, and the red light warning light on the voltage gauge will illuminate.
Can a Porsche 928 be driven in limp home mode?
It is not recommended to drive the car for an extended period of time in limp-home mode. The 928 utilizes a throttle position switch (TPS) to make fueling and ignition timing adjustment based on throttle input. The TPS has a setting for idle and a setting for wide-open throttle which is only activated at about 3/4 throttle input.
Where are the ground wires on a Porsche 928?
One is at the top of the “O” in the word Porsche cast into the cam cover — and it may be covered-up by the emissions air injection valve/hose. The second attachment point on the cam cover is more visible and is closer to front of car. Point 10 For later Euro cars, look for ground wires attached to the back of cam gear metal rear covers.
What does the TPS do on a Porsche 928?
The 928 utilizes a throttle position switch (TPS) to make fueling and ignition timing adjustment based on throttle input. The TPS has a setting for idle and a setting for wide-open throttle which is only activated at about 3/4 throttle input. The TPS is a very common failure on 928’s and can cause various poor running conditions.