Engine problem

BD10NNF

BD10NNF

BD10NNF

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Joined
24 Aug 2009
Posts
1,386
Location
UK
My car is shuddering/jerking when I pull through the revs. Its OK if I dont put my foot down or travel at low speed or stay below 2.5k rpm. Ive checked my airfilter and its a little dirty and the airbox has nothing in it. I took my car in for a full service 10k ago and it should have had sparks, oil etc changed.
Does anyone know whats up with it?

BTW its vvti if that helps at all.

Cheers
 
its not a misfire because it doesnt do it until I get to 3k rpm. It like the vvti kicks it and then stops. Then when I keep my foot in it going up to 4.5krpm it kicks in again and stops and does the same at 5k rpm. It doesnt do it when Im just going around at low revs
 
A guy from another forum who works for Toyota seems to think its just the MAF sensor by what Ive told him. If it isnt then I think its the coil pack as well.
It only does it when I go past 3k rpm in every gear. So Ive been keeping it below that and my car seems fine.
 
The thing is I hadnt really noticed cause I dont really drive like a nutter. I only noticed it the other day but I just thought it was something of nothing and I stopped giving my car stick. Then it was still doing it on the weekend, so I thought that theres something wrong.
Also my car hasnt been over 3k since I let my mate have a look at the problem and he seems to think its something to do with the air box sensor. Anyways Im going to clean it today and see if that sorts it. I will update you all and then you know if you even have a similar problem.
 
TBH I havent checked the oil and I dont have any warning lights. I had a quick look at the dipstick and it seemed fine but I didnt wipe it and have a proper look. I will be doing that before I remove the MAF.
The car seems fine as long as I dont put my foot down. I will be having a good look at it soon.
 
Well I took my MAF Sensor out and it was really dirty, so Ive given that a clean and the car seems to be better now. Only thing is, is that it seems a little restricted but Im not to sure I only took it out for a 2 minute spin. I will give it a proper test on the long drive home.
 
Now then. After my drive home I have still have a problem. I cleaned the MAF I think. Its a blacky/brown colour with a hint of orange. I dont know if thats normal. Now the car goes nicely to 4.5k rpm then starts to cough and struggle to get past that. I do now believe the coil pack is in need of changing but Im hoping that its just the MAF that will need replacing if it had broken due to it been a strange colour.
 
If I unplug it my car just goes dead because it cant work without it.
I cleaned it with some contact spray and then used air duster to dry it. I think tomorrow I will have a look at it again and have another look. I do hope it the MAF but Ive got a feeling its probably going to be the coil pack.
 
My friend had the same problem with his car. It isnt a Yaris. I also let it dry over a 5 minute spell and I spray gentley with the air duster not to damage it. Im going to give it another clean tomorrow when I can see outside. Unless anyone else has any better ideas other than taking to a garage to have it looked at.
 
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