Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[archiewood]

Okay, tested for leaks again after re-torquing the bolts on the plenum and throttle - tried running it with the idle hole blocked off and it cut out, so that's something. It's still idling at 3-4k though - I think the idle valve is screwed.

Maybe I should start another topic for this, but the other symptoms haven't gone away.

I replaced the crank sensor today, and the fault light has gone away (even under acceleration) but the symptoms haven't. Still idles high, very sluggish under hard acceleration, although it seems possible to rev as high as I want as long as I do it gradually (I haven't gone above 4.5k though as I'm running in new rings and bigends). More than about 3/4 throttle and it bogs down, like it's retarding fuelling.

I began to suspect the unichip might be at fault as it hasn't been remapped yet. So I bypassed it, and the car is now on stock C25XE management. The hesitation is much less pronounced (because of the power reduction), but it is still definitely there. Hard acceleration causes nasty sluggishness, which worsens the more throttle you apply.

I'm running out of ideas what this could be. Throttle position sensor?  :-?

[manny]

Okay, tested for leaks again after re-torquing the bolts on the plenum and throttle - tried running it with the idle hole blocked off and it cut out, so that's something. It's still idling at 3-4k though - I think the idle valve is screwed.

Maybe I should start another topic for this, but the other symptoms haven't gone away.

I replaced the crank sensor today, and the fault light has gone away (even under acceleration) but the symptoms haven't. Still idles high, very sluggish under hard acceleration, although it seems possible to rev as high as I want as long as I do it gradually (I haven't gone above 4.5k though as I'm running in new rings and bigends). More than about 3/4 throttle and it bogs down, like it's retarding fuelling.

I began to suspect the unichip might be at fault as it hasn't been remapped yet. So I bypassed it, and the car is now on stock C25XE management. The hesitation is much less pronounced (because of the power reduction), but it is still definitely there. Hard acceleration causes nasty sluggishness, which worsens the more throttle you apply.

I'm running out of ideas what this could be. Throttle position sensor?  :-?

For it to be revving so high it must getting air from some where ? What if you block air filter with some thing and see if it cuts out? If it keeps on running its got a leak.

[archiewood]

As I said, if I block the idle valve hole it cuts out. I'm satisfied there isn't an air leak now.

As I also said, the idle valve, for some reason, is just opening to maximum as soon as the engine starts and is staying in that position. For this reason I am driving around at the moment with the idle valve plumbed in but disconnected. There is a small air gap when the valve is not operating so enough air gets through for it to idle at about 1500, which I can live with for now. I am waiting for a replacement idle valve.

Having got rid of the crank sensor fault though, I think that this is not related to the hesitation problems.

[archiewood]

If anyone's curious it turned out to be the throttle position sensor. On the C25XE the sensor is on the other side of the throttle body but is of the same type, meaning the X30XE uses an inverted reading compared to the C25XE, so the full throttle position on the C25XE is the idle position on the X30XE, and vice versa.

Flipped the polarity on the voltage supply to the sensor, viola, ALL of the problems disappeared.  8-)