I've tried everything.....and now it's dead (CONCLUSION)

[skytek]

Is the one I have sitting on the piano a knock sensor? Does it look like the right thing?

[matt_mr2t]

Yeah thats a knock sensor. Do you know if it came from rev2 or a rev3?

[skytek]

It's off a rev1 I think. Mine's a rev2 with full rev3 conversion. I assume the knock sensors would be the same for rev1 and rev2, but then again the o2 sensors had totally different wiring. the rev1 had 1 wire and mine had 4

[matt_mr2t]

They all fit, rev1 and 2 directly to yours but the rev3 would need a different attachment to plug the wire in.

Apparently the rev3 ones are a little stronger.

[steve b]

I was just surprised that the engine failed so soon after I bought it off you, considering it wasn't on the cheap end of the price range having the mileage that it did and so I expected a well sorted car.

I'm not saying you intentionally sold me a lemon. However, I did buy a lemon, whether you knew about it or not.

Mate I wouldn't be like that, if you genuinely think its knackered I'll buy it off you for the price I sold my declared knackered rev2 i.e. £1500

I bet its a very simple £50 or under fix, your just having trouble locating it. Shame your in NI, bet if you popped it in to Mr woods, James or one of the specialists they'd have it ok in an hour.

[THE DUKE]

The pic you posted is not the knock sensor. The pic you posted is of the gearbox!

[skytek]

I was just surprised that the engine failed so soon after I bought it off you, considering it wasn't on the cheap end of the price range having the mileage that it did and so I expected a well sorted car.

I'm not saying you intentionally sold me a lemon. However, I did buy a lemon, whether you knew about it or not.

Mate I wouldn't be like that, if you genuinely think its knackered I'll buy it off you for the price I sold my declared knackered rev2 i.e. £1500

That was in reference to my old NA mate, the one that needed a new engine after I bought it, not the one that's giving me problems at the moment .

[skytek]

The pic you posted is not the knock sensor. The pic you posted is of the gearbox!

Yea I got a bit confused . I'm crap with cars lol

Matt explained to me that the knock sensor can be accessed from underneath the car, under one of the cylinders. It's going to be an 'up on the ramps' job for next week.

My plan is to change the knock sensor, and if that doesn't fix it I'll pop on the mbc and if that doesn't fix it either....um.....

[skytek]

Shame your in NI, bet if you popped it in to Mr woods, James or one of the specialists they'd have it ok in an hour.

I know . I almost thought about taking it over to 3S on the boat but that would just be getting silly

[CosmosblueMR2]

bit off topic so for that i appologise but can Duke or anyone tell me what the springy round cap is next to the bolt here on the top of the gearbox ? (not the arrowed part - the round bolt/cap left of the bolt on the gearbox shown below)

is it some sort of valve ?


this part.........................^^^
it "springs" up and down

just curious

[matt_mr2t]

IIRC it's a type of valve for letting out air pressure that builds up with the heat in the box but I could be totally and utterly wrong on that!

[Stefen]

Correct. It's like a ventilation value.

It will also let out oil if a gearbox is way overfilled.

[THE DUKE]

Yep, it works in the same way as an engine breather, releases hot air and if required excess fluid. Just a vent really.

Have a pic of a knock sensor if you guys want to see where it is on the engine, just been working under her and took some ref pictures

[skytek]

Sounds good mate. Please upload it

[skytek]

Update:

Great to have the forum back again!

Ok guys, I've made some progress but I'm not out of the water yet. I had a replacement knock sensor fitted (the one I'd bought didn't fit but I found another one) and it's cleared the knock error and we're now boosting to 1 bar most of the time. Occasionally I have a slight flat spot upon boosting but most of the time it's ok. So, two things still concerning me are the flat spot and the fact that I can't hit 1.2bar of boost. It's like I've gone back a few weeks to how things were then, only the car pulls quite a bit stronger to 1bar.

What could be causing the occasional flat spot and why can't I hit 1.2bar? I'm thinking of replacing all the ignition components as a starting point (despite it being less than a year since they were done). I've done the plugs already so it's just the leads, dizzy cap and rotor arm next. Can I get all these from toyota and will they have to order them in because it's a turbo?

If that doesn't work, I'll try changing the o2 sensor. I'm also going to fit the grainger valve (manual boost controller) tonight but I'm fairly sure it won't make much difference as I feel my apexi is working properly and something else is causing the problems.

At least we're getting somewhere again.

Cheers.

[skytek]

The neverending thread continues. I expect everyone's sick to death of this by now lol

For anyone who might be still following this, here's another small update:

Last night I fitted the maual boost controller to rule out any possible fault with my apexi, but as expected it made no difference. I still cannot boost beyond 0.98 bar and I still have that flat spot upon boosting which goes away after a few blasts of heavy boosting.

I just need to know what to change next? Should I renew my ignition components? (plugs are already done) or should I replace th eo2 sensor? I'm not getting any error codes at all now so I'm not sure spending 70 quid on an o2 sensor will fix it. I've also been told by 2 people that changing the ignition components won't help either.

Any advice would be much appreciated so I can get this sorted and free up some imoc bandwidth here. I must also apologise for creating the worlds most boring thread but I really want to resolve this blasted problem for good.

Thanks

[MR2lover]

Just Something to note, Faulty o2 sensor rarely bring up a error code for when they go wrong as the only time it causes a error code is when no resistance is found.

Also O2 Sensor are only used by ECU on Cruise and idle so i doubt this is gunna solve it.

[MR2lover]

Also O2 sensor are only Like £30 including flange which u need

http://www.buypartsby.co.uk/lambda_sensors.php

[MR2lover]

Right on your car u have a rev3 conversion so basically i would be check all the nessary parts that calculate the fueling and ignition advance on rev3.

Go buy a multimap meter and check for reistance on these things. Also Check that the resistance is correct by using bgb info

- Manifold air temp sensor, This is the sensor under the manifold which will probably be located in the cold start location on rev2.

- Map sensor, Sensor on bulkhead near diagnostic port

- O2 sensor

- AIT sensor in tubing before turbo

- Knock sensor

- Water temp sensor

All these thing could be causing your problem dont relie on the ecu to throw an error code as this doesn't always happen, My o2 sensor wasn't even connected on my rev3 conversion and it didn't throw an error code so dont trust a light flashing light always. Check your self

hth

[skytek]

Thanks mate, that's very useful info. I'm not so handy with the multimeter so I guess it's going to be a case of keep replacing things till either A. The problem goes away or B. I end up with a completely rebuilt car

Can you give me any feedback on my thoughts on replacing the ignition components? Is it worthwhile?