Question about Alfa Romeo 145

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Idling Problems, Idling Revs Up and Down

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 £?

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  • epmnnds Mar 11, 2009

    My alfa romeo just goes off after a 1 mile dirive or so I then have to wait for an hour and the same thing all over again any Ideas?



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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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