Vauxhall astra

[brett_wilson]

Got a astra 1.6 16v mk4 Y reg 66,000miles driving home other day and car started to miss fire doing about 30mph then dropping to 10mph in quick succesession there was no engine man light. Drove it the few days later no problem apart from it felt as tho it was pulling back the car and not performing right. Its just been into a vauxhall dealer, they say it was due to low oil which was S***. i checked oil and it was half way it says in haynes manual thats ok. all vauxhall did was find other problems with car and nothing to do with the loss of power waste of 36 quid. I thought it may have been cat convertor because a while back when i purchased the car it was doing the same thing, took it back to the place i bought it there answer was the cat convertor had ruptured and blocked from cat back there price �799 get away took it to a cheaper garage there answer its not the cat just the silencer and back box were blocked. got job done spot on car worked perfectly up until now. to make sure it was not the oil been low i have changed oil and filter but still felling the car not performing to its highest ability. please help as i drive long journeys most weekends and dont want to see myself stranded watching nissan micras driving past me. embaressment.

[__LEE__]

ermm.. could be one of many things here..
common problems that can cause similar are..
cam sensor, crank sensor, O2 sensor (you have 2), throttle position sensor, engine temp sensor...... these are just to name a few items.

i am affraid that to diagnose this fault one would really have to see the car

i would normally expect a blocked exhaust to be more noticable at the higher rev range. .
One possible test you could do is to pop down to any local garage and for a few quid get them to do an emmission test on your vehicle and ask them about any strange results..
(erratic readings still show up even tho you have a cat. Plus you test your cat at the same time:)