[Mk2] [Turbo] intermittent boost

[willbutler1]

I seem to get an issue with the boost on the car, one min its fine and boosts well, but then I only seem to get two thirds or sometimes half boost in the stock gauge accompanied by a lagging feeling in the car. Could it be the waste gate sticking? I do have some sort of micky mouse manual boost controller (some sort of knob thing bolted to the engine, I dont fiddle with this) I also have a Fuel cut defender. all a bit starnge but any advice would be great.
Many thanks

Will B

[Quigonjay]

you need to get a boost gauge fitted to see what you are running
possibly hitting fuel cut and going in to safe mode?
any error codes stored?

[willbutler1]

I have a gauge I could fit to see what pressure its running at but where do I tee it into? Also how doI find the error codes?

How do i stop it hitting fuel cut if this is the issue?

Many thanks

Will

[Steve-O 2007]

I had a similar problem on my Rev2 and my problems were, Timing not set right and big air leaks in the intercooler pipe work

[willbutler1]

Did yours stop boosting properly or was it like mine, internittant? Just dont really know where to start, I am only guessing but the only way to describe it is if you could imagine the wastegate sticking. people who have followed me have also said it smells quite rich, so could it be putting more fuel in than it needs cos it thinks the gate is fully open. I dont really know much about these so I am hopeing that someone has had this before and may be able to point me in the right direction.

[David21]

I would say also if your not sure on the MBC you have, maybe you could take it out or bypass it then that will rule out one thing in the equation if there is no change

[willbutler1]

Top idea!! thanks will give it a go

[MR2_RICH]

Have / had a similar issue mate. One minute boosting fine the next put your foot down makes all the same noises, still boosts up to 15 psi on my gauge but doesn't actually accelerate.

5 mins later all is ok again, sometimes not.

Never got to the bottom of it and had similar thoughts re a sticking wastegage or the mbc. Haven't used the car for 3 months so I'm hoping the passing of time has magically cured it lol.

Let me know how you get on.

[Steve-O 2007]

Have / had a similar issue mate. One minute boosting fine the next put your foot down makes all the same noises, still boosts up to 15 psi on my gauge but doesn't actually accelerate.

5 mins later all is ok again, sometimes not.

Never got to the bottom of it and had similar thoughts re a sticking wastegage or the mbc. Haven't used the car for 3 months so I'm hoping the passing of time has magically cured it lol.

Let me know how you get on.

same as what I had as well.

You could be driving around normally nice and happy, stop at some lights, lights turn green and you floor it to try and look cool (lol) but you go no where and end up looking like an idiot!! Turbo still spools up but the car sets off slower than a 1.1 Metro and a VERY strong smell of unburnt fuel. Feels like the ignition has been Realy retarded to a point where theres hardly any power. Or You could goto overtake something, drop to 2nd / 3rd, put your foot down to go for it and the car would just bog right down

What I think the problem is (or what my problem was) the Timing was set so wrong that it was creating knock that the knock sensor was picking up, This was then telling the ECU to Retard the timing to save the engine but it had to retard it so much all the power was gone and it ran so rich you could smell Pure VPower inside the car (light a match near the exhaust and I bet it would have made HUGE flames) and you could actually see the fuel guage go down!!. Then after a while the knock sensor is happy as the knock has dropped so the ECU changes the timing back to normal giving the power back.

I Done my timing and also checked for air leaks and now my car has never done it since (Well only once when the Vacuum pipe on my bov blew off)!!

So definatly Check your timing, only takes 5 mins to do and if you dont have a timing gun get one, about £20 on Ebay for a Draper one and it works great.

[willbutler1]

Good point, I will get it checked out, many thanks

[Steve-O 2007]

my timing was out by 5 degrees when I checked it

A good tip is to find your timing mark with a torch (with the engine off) and put some white paint / tippex on the mark. Start the car up and shine the timing light down

remember when adjusting it you have to have te1 and e1 connected

[MR2_RICH]

my timing was out by 5 degrees when I checked it

A good tip is to find your timing mark with a torch (with the engine off) and put some white paint / tippex on the mark. Start the car up and shine the timing light down

remember when adjusting it you have to have te1 and e1 connected

Sorry to hijack again but hopefully my question can help others out.

Why do you need to connect the pins as mentioned above? and what range should the timing be at?

Thanks

Rich

[Steve-O 2007]

my timing was out by 5 degrees when I checked it

A good tip is to find your timing mark with a torch (with the engine off) and put some white paint / tippex on the mark. Start the car up and shine the timing light down

remember when adjusting it you have to have te1 and e1 connected

Sorry to hijack again but hopefully my question can help others out.

Why do you need to connect the pins as mentioned above? and what range should the timing be at?

Thanks

Rich

you need to connect the pins because if you adjust the timing without them conncted the ecu will re adjust the timing itself as you turn the distributer.

With the pins connected the ECU wont affect anything and allow you to change the timing. Once set you just turn the car off and remove the wire connecting the pins. Start the car again and make sure the timing is still good.

Oh and you want the timing set to 10 Degrees

[willbutler1]

I will be changing the hoses to the wastegate actuator and the relief valve and the MBC, someone has fitted some rubbish blue hoses that are quite soft, could they be collapsing?!?!

[Steve-O 2007]

if they were collapsing I think you would be overboosting as the actuator wont be opening

[willbutler1]

Ok scratch that idea, I will remove the MBC from the system and see how it goes. . . . . . . . . . but I dont know how to do it. should I just pull the pipes of and the join them together to take the MBC out of the loop

[Steve-O 2007]

yea disconnect it and joing the 2 pipes together and you will run actuator pressure, should boost too 0.5bar area. But I would also check the timing if you can

[willbutler1]

Thanks for that will do, My brother has a timing gun but just a thought if it wer the timing wouldnt it do it all the time, sorry if being dim

Many thanks

Will.

[willbutler1]

Hi

I may have found the problem, I fitted a boost gauge (just temporary plumbed in just to see what the car was doing) and the car would not boost more than 10psi, so after checking lots of hoses and MBC fittings I tried another run and it still wouldnt boost more than 10psi sometime it wouldnt go higher than 6psi!! I removed the MBC from the system and went for another run and car boosted happily up to 16.5psi at its peak and with the throttle still down the boost did gradually dropped off (is this normal) but I will look at getting a MBC, will this help maintain a higher boost setting as well?!?!

Regards

Will