Question about Alfa Romeo 145
Ive just bought a 2000 145 1.6ts its done 95k, i just about got her home when it cut out, ive had a mobile tuner diagnose the rpm sensor,and phase sensor as a fault, he cleared the ecu memory ran it for 10 minutes until it cut out again checked the ecu and just the rpm sensor fault came back he said the phase sensor could be various things and that the rpm sensor is the problem so after clearing the ecu memory again he put a new one in and no more faults, 25 miles later the idle revs will jump from 600 up 1000, ive not got any serv/hist with the car and does sound like a bit like a diesel so in the long run or probably sooner new belts would be best, but short term what checks can i do as a novice with engines. ive read some threads about cleaning the butterfly thingy, i dont think its the lambda sensor cos this didnt come up as faulty, the exhausts back box has a hole a the bottom dripping out black s**t how do i clean the butterfly thingy? what is the average £price for a belt change so i know i wont get ripped off? will most garages be able to fit a new exhaust and for ho much £?
First just try unplugging the MAF and seeing if running the car with it unplugged resolves the problem. If it does then you have a faulty MAF and need to replace it. A faulty MAF won't necessarily show up on a diagnostics check. You will find the MAF between the air box and the throttle body housing on the right hand side of the engine bay at the back. The electrical connection plug you need to remove is on the top of it... To clean the throttle body housing, remove the pipe with the MAF in it (2 jubilee clips, one either end) then either try and clean the housing with it still attached to the car or unbolt it (4 ribe-headed bolts) and clean it off the car. You will also need to unclip the throttle cable and unplug the stepper motor (the black thing on the side)... If neither of these things work then you might have a faulty throttle stepper motor. Replacing this is a specialist job as it needs to be correctly calibrated after fitting. Other people on this forum have quoted prices between £100-200 for the part, fitting and calibration. For a cam belt change you are looking at around £200-£300. The diesel sound on startup is a knackered variator (it's on the end of the inlet camshaft). It's better to get one of these fitted at the same time as the belts are changed to avoid paying additional labour charges for having the belts removed and refitted again at a later time. Add around £100 on top of the belt change for a new variator. Exhausts can be fitted by any garage.
Posted on May 14, 2008
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following are the general instructions on the start of diagnosing any
electronically controlled engine or transmission problem.
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), 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 ca cause many
drive-ability related problem such as rough idle and other symptoms
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