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[the hamster]

Well, replaced the cam sensor tonight, and the crank sensor 2 weeks ago and the car seems to be running better but there is still the lack of performance and an overly load induction/exhaust noise. I paperclipped it when it started playing up but only the cam sensor showed 0340.

I've done a plug and lead change, and checked the breathers and all are clean n clear. The problem only seemed to turn up when the cam sensor started playing up but I cant think what has gone wrong, unless the ecu hasnt sorted itself out yet after the new sensor was fitted.

What are the symptoms of a knackered cat or lamda sensor? Should I get a code for both of these? Car is a 2.0 16v 1998 manual with aircon

When idling, if you blip the throttle there is a huge hesitation before it revs but if you do it smoothly it revs ok. When driving it seems to be producing a lot of noise and not a lot of go, certainly less than usual.

Its had new crank and cam sensors in the last couple of weeks but I thought it would purr after these were done but I think I might have other issues.

Help please!  

[doz]

Might sound daft but you say it makes a lot of noise. One of the baffles in the exhaust hasn't collapsed and restrictrd the exhaust?

[the hamster]

I was kind of thinking along those lines but the car is 80,000 miles old and I thought the cat might have given up, it looks pretty rough from under the car but I didnt check the back box.

Better go and give it a shake.

[Jay w]

classic sign of the cat failing is a rattling noise whilst driving, as my friend put it 'like a skeleton having a w*** in a tin drum'

They also do the opposite and block up thus causing loss of power

My cats failed at 140,000 miles but that was because i ended up with neat petrol going into them, had that not hapened i am sure they would have run and run, yet from the outside they looked a scabby as hell

[the hamster]

No rattles from the cat so i'm thinking its something more serious.

The engine is pinking like mad under load and when I open the airbox and take the filter out while its running the engine is making a rythmical popping sound as apposed to the usuall induction suck.

Does this sound like a stuck valve and would this have caused the cam sensor fault to show up? what does the cam sensor do?

Really need some suggestions here cos i'm running out of ideas and its the missus kiddy carrier so we are stuck without it.

Please help!

[the hamster]

theres also a significant amount of smoke from the exhaust on start-up, regardless of wether the engine is hot or cold.

[tmx]

150k and on original cats still plenty of life in em hopefully

[doz]

I had a headgasket go on my old astra gte years ago. It didn't mix oil and water it went between two cylinders and resulted in a gutlees lump and loads of pinking etc. May be worth doing a comp test before you get to involved

[philhoward]

Cats on their way out normally smell like rotten eggs when wamring up - but brake fluid  [smiley=shocked.gif] makes loads of smoke and makes an engine pink..

Sounds like you might have a valve problem, though...could be as simple as a lazy tappet, or an actual sticky valve

[FRE07962128]

I would check compression on all cylinders and identify if there is any loss.  If so head gasket or piston ring faults come to mind. Is the sound indeed like a 'slapping' of a piston? :-?

[the hamster]

i'll record it with my camera tomorrow and post what it sounds like.

I hope nothing major.