I need urgent advice pls. Toyota avensis 2005 slows down a bit and the sound from the engine increases whenever i accelerate up to 100. Even when i try to apply more pressure on the throttle,the engine noise increases with just little more increase in speed.This happens for about a minute b4 it stabilizies again.I dnt just go beyond 110 even when making a long distance journey.
My mech seems confused,plus i dnt wanna complicate issues more. Pls help a friend

manual or automatic, what is the rpm like?

JUO: manual or automatic, what is the rpm like?

Automatic sir,any idea?

IdaraCHODB: blocked catalyst? once my car would accelerate to 80 km/hr but had difficulty going beyond that, turned out to be a blocked catalytic cnverter. might want to check that. do a scan.

Noted sir,pls expantiate on what a blocked catalytic converter is pls.Thanks a million

I suspect it could be your gear trying to get into overdrive.
Same as the noise, if you observe when the noise occurs your RPM will suddenly jump, it may hover between 4000 - 5000 rpm, this could be when the gear are trying to get into overdrive and failing, that also explain why you cant go above the 110km/p mark, the overdrive is supposed to take it from there.

But wait o, are you sure you did not put your overdrive switch off? or is the switch faulty? you may look into that.

But mean while don't over race your engine as your racing it closer to the grave, drive at the car's limit for now while you fix the problem. Try not to exceed 3500-4000 rpm.

IdaraCHODB: Please see: http://en.wikipedia.org/wiki/Catalytic_converter - text

http://auto.howstuffworks.com/catalytic-converter.htm - text


https://www.youtube.com/watch?v=IzyvL5tQLzU - Video

Thanks alot...

kakameks: I suspect it could be your gear trying to get into overdrive.
Same as the noise, if you observe when the noise occurs your RPM will suddenly jump, it may hover between 4000 - 5000 rpm, this could be when the gear are trying to get into overdrive and failing, that also explain why you cant go above the 110km/p mark, the overdrive is supposed to take it from there.

But wait o, are you sure you did not put your overdrive switch off? or is the switch faulty? you may look into that.

But mean while don't over race your engine as your racing it closer to the grave, drive at the car's limit for now while you fix the problem. Try not to exceed 3500-4000 rpm.

Thanks a bunch. I ensure i dnt exceed its limit.There is a little switch just above the gear surface,i mean where u have the numbering D1,D2 ....and so on.Cld dat be the overdrive switch? If not,where cld it be? Whats the likely solution to a failing overdrive?
Thanks

IdaraCHODB: blocked catalyst? once my car would accelerate to 80 km/hr but had difficulty going beyond that, turned out to be a blocked catalytic cnverter. might want to check that. do a scan.

This makes a lot of sense to me.Too bad my location wnt allow a scan,no such facility around here.Do u think local mechs wld ever understand this if i try to throw some light in the direction of ur suggestion?

Tanks for ur wonderful contributions. I finally rectified the problem. It was bad gear box oil,tanks to the low-life who sold me expired oil few months back
My car is back and firing,just lik the capital one rides! Lol....God bless my hitherto clueless mech

IdaraCHODB: Great, and how did you reach that diagnosis? Not questioning it though! Your mechanic? A transmission tech? Or someone else?

Am plain curious!

All through the period of complain,i never really explained to my mech cos i felt it was sumtin more tech..i told every other person dat cared 2listen though.
I was confused as i had gathered too many info,both confusing once as regards the problem.Dropped by my mech one day cos it was getting worse and i gave him in details..he went straight to check the gear oil,it looked ok,told him it was just 3months and cldnt have caused such problem...i still had one unfinished can left,we checked the expiry date and it had expired 3months b4 i bought it..i guess they all had same dates. He emptied it and u cld percieve the smell of burnt oil! was really bad but looked ok frm d gauge. We changed it and bang....i cldnt bliv it was same car,made a trip from benin to abj and back over d weekend...real cool.

Taking time to say all these cos its such a huge relief for me and i might just be helping someone here too.
Pls take expiry dates seriously. Even for airtime now,i dey check b4 i buy nw