red wrex

On my my94, I reset the ecu and now when i put my foot down the car revs its head off without really doing much.

Is this the ecu cutting the fuel/ignition because of overboosting, or is it pre det.

This is baring in mind that when i bought the car it started doing this and then after a while it stopped. Could the ecu have retarded the timing to stop this happening, and how can i stop it doing it after a reset

The_Judge

If the car's using the stock wastegate solenoid, with no bleed valve or manual boost controller, then it's unlikely it's overboosting. A boost gauge would give you more of an idea though.

Quite possibly. If it is/was det, you certainly wanna hope so...!

I'm assuming you have an import. To completely stop it, get a ScoobyECU, which is mapped to our fuel. To reduce it, make sure you use Optimax and Millers octane booster (or NF if you can get it).

Get yourself a knocklink to be absolutely certain of what it's doing.

greasemonkey

Could you be a little more specific with your descriptions? What do you mean by "not doing much"? If you're saying that the revs shoot up but the car doesn't actually go any quicker, that'll be your clutch slipping...

SuperFlyGuy

I agree, sounds like clutch slip. Especially if it comes and goes, as mine did, until eventually I had to get a new one fitted.

red wrex

Sorry, I mean it revs but does not go anywhere,

it has not done it for ages but now i have reset it is back,

also what is launch control actually controlled by, would the ecu do it, and if so would it change the settings depending on knock, fuel etc...

because my pick up problems seem to have gone but now it just revs its nuts off instead.....can i find a happy medium,

I have just been out and filled my car with £30 optimax and a octane booster

gonna reset again tonight and see if this helps out any

pblakeway

Launch control on a 94 i believe is controlled by your left foot

Does sound very much like clutch

The_Judge

That particular comment doesn't sound like clutch to me...

But that does...

But that doesn't...

Mate, I'm well confused...!

red wrex

Ha isnt it the same on them all blake!!!

I agree it does sound like the clutch but i wonder why it has not done it for months and now it is again after a reset?

AvalancheS8

The ECU has no way of affecting the connection between engine and wheels so if the revs are changing when the speed is not then your clutch is dying. Barring some other part of the transmission being broken there is nothing else it can be. On the other hand if the revs do rise in line with the speed but it isn't pulling right then it could be ECU related.

red wrex

Me too judge

cant think what it could be though,

why would a slipping clutch all of a sudden be normal again and then after months of being ok start slipping again.

I may just run it for a while and see if it goes back to normal.

Daft jap thing....

red wrex

Cheers av

Is what i am describing not the ignition being cut from over boost. I know its running standard gear but if the wastegate was sticking would it over boost (and would this cause my dv26 to sound like a dying giraffe)

The_Judge

Slipping clutches don't normally have a habit of fixing themselves...! It's normally a slippery slope.

AvalancheS8

No, and that is the strange bit, but if the engine is reving and the car isn't going then something is slipping, the clutch seems by far the most likely. Perhaps something intermittent is up with the clutch actuation and it isn't engaging properly ?

red wrex

so could we have release bearing issues

The_Judge

...and the ECU reset is a total coincidence? Stands a chance...

red wrex

cheers guys,

looks like an action packed weekend on the ramps, lucky the local garage lets me use his stuff,

I will whip the box off and have a look

thanks again

greasemonkey

It won't be a release bearing issue. About the only thing that could happen there would be the nose of the bearing pulling out of the clip, and if that happened, you'd simply find the clutch would be permanently engaged, and pressing the pedal wouldn't do anything.

The one thing I do wonder is whether the rear crank oil seal is leaking, and oil is finding its way onto the friction surfaces, but the likeliest culprit at this time would be a knackered clutch.

If it's "revving but not going anywhere", something in the drivetrain must be slipping. If it was anything other than the clutch, the slip would be accompanied by easily noticeable and very unpleasant sounding noises.

Other thing you might want to explore is the possibility of the clutch fluid boiling - although this would only be a plausible explanation if the slipping started after giving the car an extended period of stick.