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[bruiser5050]

Hello all
i've had a couple of Omegas in the past , currently got a Treg estate thats causing me a few issues , engine starts and pulls ok but when trying to hold a specific speed e.g. 50mph the revs go up and down 200rpm up 200 rpm down , if i give it some gas it will clear but doesnt seeem to be pulling like it should , no misfires on the engine , seems to be worse when warm ,

any ideas

many thanks Mat

[Omegatoy]

commonly known as the woo wah test,
try holding 2500rpm steady while sat still in neutral,if it still wavers up and down fairly safe bet lambda is goosed

[bruiser5050]

cheers mate , forgot to mention its a 2.5v6 , just done the test and it doesnt hold as well as id expect , also smells like its running rich which i would guess also points to the lambda sensor

Mat

[Omegatoy]

yep slow or old lambda for sure, change em!! it will be better to drive and more economical, win all round! when changed it should hold rock steady whatever revs you hold the throttle at 

[bruiser5050]

cool , are the cheap ones off ebay any good or is it better get dearer ones , or do i buy second hand?

[Omegatoy]

lol "buy cheap buy twice" is a good piece of advice!!!
2nd hand ones aren not worth bothering with to be honest, and universal ones you would be lucky if you get 10k out of them!! buy original fittment if you can, if not then a quality replacement such as Bosch or NGK would be my advice

[bruiser5050]

cheers mate , just took it out for a blast and the problem seems to be worse , stuck it in sports mode and floored it , revs well but lacks power and wont change out of first gear , could it still be the same thing the lambda?