Car ran fine with original repaired ECU (memory problems) and suddenly started to run extremely poor (misfire, fuel starvation / over fuelling , no power, hard starting). Repair to ECU necessitated by no turbo boost at pull away requiring ease off throttle and re-acceleration to obtain boost (not full power). Changed fuel pumps (in-tank and tandem), numerous fuel filters and T-pieces, MAP sensor, crank angle sensor and N75. No change
SOURCE: My Audi A3 2.0 tdi limp mode/turbo overboost
i also have done a diagnostic test and it states a turbo overboost condition and it drives fine locally but loses power on the motorway and struggles to reach 80mph? any suggestions please email me at [email protected]
SOURCE: 1997 F-350 Ford Powerstroke4x4 Crew
Have you changed your oil? Rotella 15W-40. These engines really don't like old oil. It becomes too thick for the injection pump to work correctly. Another possibility is a bad cam sensor on the front of the motor. Most engines call this the crank sensor but on this engine you have to look it up as a cam sensor.
SOURCE: 2001 peugeot 206 non turbo diesel with intermitent
I think some air going into fuel system.Need to put some compressed air in fuel tank and check for leak.
SOURCE: 99 ML430 143k miles, had codes for misfires on cyl
P0100 OBD-II Trouble Code
Technical Description
Mass Air Flow (MAF) Circuit Malfunction
Basically this means that there's a problem with the Mass Air Flow (MAF) sensor or circuit.
You will likely not notice any serious driving problems, but there may be symptoms like a general decrease in power or sluggishness.
Causes
A code P0100 may mean one or more of the following:
* The MAF may be disconnected, or a wiring connection may be bad.
* The MAF sensor may be faulty.
Possible Solutions
Use an OBD II Reader (or go tou your local parts store and they will for free) and reset the code and see if it comes back.
Then start with the cheapest, easiest repair procedures:
* Check the Mass Air Flow Sensor wiring/harness is connected properly and that there are no broken / frayed wires.
* Unplug and reconnect the MAF wiring harness a few times to clear the contacts.
* Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information).
* Replace the MAF sensor.
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SOURCE: 98 Chevrolet Silverado runs rough at half throttle and past.
try removing the EGR valve and clean inside of it and manifold
The
following are the general instructions on the start of diagnosing any
electronically controlled engine or transmission problem.
The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.
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