1.0 12v juddering

[spooky19587]

Hi guys hope you can help. head gasket went on my 12v and engine died so replaced with a used but fine lump, had done about 47k. Had an issue with acceleration high up revs and replaced mass air flow sensor which fixed the problem. 2 days later and it has an intermittent sensor fault. When low down the revs the car hesitates and judders like its trying to go, then when revs get higher it will eventually go. As i said it doesnt do it all the time and it idles fine. can anyone point me in the right direction???

[matty101]

try cleaning the idle control valve and the egr valve. there are guides in the FAQ section

[tango]

give it a good service, mine did this when i first had it, was really dangerous on islands, changed the air filter and it was black, new spark plugs, etc and it now runs perfect!!

[spooky19587]

the engine was fully serviced when installed. and ran perfect for 2 days. definately a sensor fault, lol, just don't know which one. as maf is new i am ruleing that out. i am thinking maybe egr or crank position sensor??? would these cause these symptoms???

[LesterPiglet1]

EGR wouldn't. EGR symptoms are engine cutting out when off the throttle and clutch pushed in.

[keith196719]

ive had something simler,,,turned out to be a coroded wire,,,,but as i found out the only way to find the problem is slowly 1 thing at a tme,,,check every single wire and connection,,,i blanked of my egr and the car is better than when i got it,,,,

[Timmy corsa B]

minprblms with irank sensor goes is it struggles to start and if your driving park up in tescos for example come backlike 5 10 mins later it wont start engine turns over but wont fire u gotta wait like an hour for it to cool down
wel thats what was with mine