faults

[robertbaby]

ive had the AA out on my free membership to plug in my car and he said the lamba sensor has gone after the cat and its a diagnosing lamba are they all the same as ive been looking on www.eurocarparts.com and the sensors dont differ also when you start the car the revs drop right down then flick up to about 1500 this happens about 3 times but AA guy didnt pick up any fault any ideas

[djl78]

You need to supply more vehicle details ie engine code,age etc in order for people to help you.

Regards
djl

[robertbaby]

sorry its a 2001 Audi a6 2.4 v6 30v engine code AML

[robertbaby]

and what a result that had cheers for that

[pete99]

and what a result that had cheers for that

Try not to be so hasty , -People on here try to help--but can only help when they see the post.
Patience is the name of the game Bud.
Its like anything - when we need something-- its not available. When we dont-- there's a surplus .
Dont worry- people understand .
Pete

[Niall76]

The sensor it straight forward enough - there are universal types you can use and they're not too expensive.

As for the revs hunting on start up, could be one of a few things. First thing I would check is for any air leaks in the intake system and the engine breather system. I was having a problem with my breathers (2.8 30v V6) and when they were disconnected they had the revs hunting. Start there as it's easy to check and fix.

Let us know how you get on, if there are no issues with air leaks then it may be the MAF.

[robertbaby]

The sensor it straight forward enough - there are universal types you can use and they're not too expensive.

As for the revs hunting on start up, could be one of a few things. First thing I would check is for any air leaks in the intake system and the engine breather system. I was having a problem with my breathers (2.8 30v V6) and when they were disconnected they had the revs hunting. Start there as it's easy to check and fix.

Let us know how you get on, if there are no issues with air leaks then it may be the MAF.

ive looked at a few of the breathers and they are those brittle fiber hoses which a few are frayed and im just going to change the them for rubber i have been told it could be the maf by the aa but hoses first

and thanks for the replys guys some posts just seem to disapear sometimes will keep you posted

[355marcus]

ONLY DO THIS IF YOU'RE A TRAINED PROFESSIONAL

Sometimes an easy way to check for intake air leaks is to spray a combustable product at your possible leak sites. If there is a leak the fluid will find a way in and for a few moments you will usually hear the engine run better as either the engine burns what you've sprayed or the leak is reduced. WD-40 will work but you get left with the wd-40 residue where you've sprayed it or cleaning sprays can work too.
Im not saying blow anything up, and it doesn't work on exhausts but it can help when access or visibility is a pain.