Date registered: Jun 2004
Mentioned: 1 Post(s)
Quoted: 7 Post(s)
What you describe is a typical MFI problem.
but First. USE as High an octane fuel as you can find. Why? because the injection runs at 200PSI at the injectors and modern fuel ,especially lower octane fuel is too volatile and you get vapor lock and low performance.
Always use ATF in the fuel tank and NOTHING else!. Auto trans fluid added to the tank at a level of 1 liter per 100 liters of fuel will clean the system and lubricate the pump . It will help slow the combustion so the engine can run on our crappy fuel we are forced to buy these days.
Now to the problem at hand.
The engine speed when in gear is regulated by a solenoid on the accelerator linkage.
Have someone sit in the drivers seat and with the engine running,the hand brake on ,and their foot on the brake,Put it in gear.
When they do this,watch the accelerator linkage. it should move approximately 10 mm.
Next, get your assistant to touch the accelerator pedal.
Note; Just TOUCH it with their foot. The Solenoid on the linkage should move back again. releasing the pedal should once again make the solenoid move.
Now... if the solenoid is not moving, check all your fuses,Number 6 is the fuse you need to make sure has a good connection as the solenoid is connected through this.
The next step involves making sure the kick down solenoid on top of the trans is working.
With the engine OFF and the ignition ON, touch the accelerator slightly,you should hear a definite click from under the car,that is the two solenoid telling the trans that car is in gear and about to move,releasing the accelerator should make it click again as the solenoid moves to the central position.
Now push the accelerator to the kick down position,it should click as the solenoid moves in the opposite direction,opening the kick down valve in the trans modulator.
if it is not doing any of these things,you have (i) a blown fuse,
(ii) a stuck solenoid or (iii) the switch on the throttle body is faulty or not adjusted correctly. (iv) there is also a switch on the rear of the accelerator pedals on earlier models ,these cars do not have the switch on the intake.
It is vitally important that all of the linkages are in 1st class condition with zero slop anywhere. Before you even think of touching the Fuel injection you make 100% sure the ignition is perfect . Then replace all the worn linkage parts.
Only then should think about the injection,it's a good system and one used by porsche right into the 1980's on their racing cars but most faults i find are caused by those playing with them .