Engine Won't Hold Onto Revs When Changing Gear

[Copperface]

Hi, I mentioned this on another thread but thought I'd better make my own and see if anyone had any ideas.

I run a 2006 56 plated 1.8 vvti Avensis 5 door 5 speed manual hatch back currently on 23,000 miles, bought from Toyota and fully serviced by them. It was my first private petrol car as I've always driven diesels before, apart from work cars which were always petrol.

From the time I have had it I have experienced this problem - the engine does not seem to hold on to revs when changing gear and, especially at lower speeds and town driving, often results in a bit of a lurch when the clutch is released and the gear engaged. The revs seem to act a bit erratically and I often think the engine is going to stall when between gears. the revs can go down to 5 or 6000 revs. Even dabbing the throttle to match revs does not always work as the engine appears to be slow to respond making the gearchange somewhat uneven.

I asked Toyota to check the throttle body housing for gunging up which they did (although I have to take their word for it!) and they said it was OK. I have even started using V Power petrol in an effort to see if it was the fuel, but have not experienced much change, apart from mpg being increased.

At idle when warm the engine revs do fluctuate a bit, anywhere between 800-1000 revs. On a cold start the engine idles at 1500 (waking the neighbours at 6am!)but then settles down into the warm range of 800-1000.

All fluids are topped up and oil change was done by Toyota in September 2008. When i mentioned this then they also said they had reset the ECU to see if that helped. Due for next service (and lapsing of warranty) in September so would like to see if anyone has any ideas that i could ask Toyota about before the warranty is finished.

Any ideas gratefully accepted.

[Q.S.]

Hi, I mentioned this on another thread but thought I'd better make my own and see if anyone had any ideas.

I run a 2006 56 plated 1.8 vvti Avensis 5 door 5 speed manual hatch back currently on 23,000 miles, bought from Toyota and fully serviced by them. It was my first private petrol car as I've always driven diesels before, apart from work cars which were always petrol.

From the time I have had it I have experienced this problem - the engine does not seem to hold on to revs when changing gear and, especially at lower speeds and town driving, often results in a bit of a lurch when the clutch is released and the gear engaged. The revs seem to act a bit erratically and I often think the engine is going to stall when between gears. the revs can go down to 5 or 6000 revs. Even dabbing the throttle to match revs does not always work as the engine appears to be slow to respond making the gearchange somewhat uneven.

I asked Toyota to check the throttle body housing for gunging up which they did (although I have to take their word for it!) and they said it was OK. I have even started using V Power petrol in an effort to see if it was the fuel, but have not experienced much change, apart from mpg being increased.

At idle when warm the engine revs do fluctuate a bit, anywhere between 800-1000 revs. On a cold start the engine idles at 1500 (waking the neighbours at 6am!)but then settles down into the warm range of 800-1000.

All fluids are topped up and oil change was done by Toyota in September 2008. When i mentioned this then they also said they had reset the ECU to see if that helped. Due for next service (and lapsing of warranty) in September so would like to see if anyone has any ideas that i could ask Toyota about before the warranty is finished.

Any ideas gratefully accepted.

Presumably you meant 5 or 600 revs, not 5 or 6000 revs?

Not sure exactly what the problem is (might be vehicle speed sensor fault) but there is nothing wrong with the cold or warm idle rpm.

If this vehicle is still under warranty and going for service soon, tell them what the problem is (take them for a ride in it to show them if need be) and let them sort it for you.

I am sure they will not like you going to them with your own suggestions of what is wrong with it from the say-so of someone on the other end of a keyboard that hasn't even seen the car. Any diagnosis on here is guesswork really, may be very good guesswork but without the car in front of you to diagnose a fault, no-one (no matter how good) can be 100% certain. Let them do their job.

[cmia]

If this is anything like the hondas,

can you look around the Throttle body

and make sure all the pipes are plugged in,

and all the electrics are fimly connected.

[Copperface]

If this is anything like the hondas,

can you look around the Throttle body

and make sure all the pipes are plugged in,

and all the electrics are fimly connected.

Will do...................if I can find the throttle body.

I'm still wondering whether something is a bit gunged up.