Engine running at last but issues....

[20Vcqdriver]

After 6 months I have now got my beast fired up and running. However there are issues I need help with. The car ticks over perfectly and opening the throttle gently is no issue, but quick opening of the throttle has the engine almost stalling, quick shut off of the throttle returns the the engine to perfect tickover without problem. This is done whilst the car is on the drive, not had the car on the road yet. Is this something that will clear after a good road run as this is the first start up after install? Also still have the old fuel in the tank from 6 months ago, will this affect things?! All help appreciated.

[Mark Halligan]

Try giving it a drive (to the nearest petrol station), and let the ECU re-learn its mixture values and see how it goes from there on?

Edit: nice engine bay

[20Vcqdriver]

Thanks, it will not be easy to drive as it is and have no MOT or tax at present which doesn't help. Will try a trip out late tonight though.

[UrS4boy]

The car ticks over perfectly and opening the throttle gently is no issue, but quick opening of the throttle has the engine almost stalling, quick shut off of the throttle returns the the engine to perfect tickover without problem.

Sounds like either the Mass Air Flow (MAF) meter or the throttle position sensor (TPS) are either sick or the connections to them are in need of cleaning. I suggest that at the very least you disconnect each one and clean the contacts (using something from the local electronics supply store) and then reconnecting them.

If that doesn't work, I would see if you can borrow a known to be good MAF and TPS and seeing if that is the cure.

[20Vcqdriver]

help

Have taken it round the block and it will not have any sudden throttle changes or half load. If sitting on the drive at 2000rpm you can feel the boost building in the concertina hose after the intercooler, but the engine sounds uneven, splutters, misses and after 30 secs starts running very rich with black haze out of the exhaust. Knock throttle shut and it instantly ticks over perfectly and the black haze dissapears.
Think I need an expert and so intend on getting to Tim Cooper of Renn-Tech ASAP. Hope it is something simple!?

[Heat Seeking Missile]

I have a working MAF and not too far from you if thats any help. It isn't perfect but did work ok.

Mark

[stiglet]

Do 3B's have hall senders??

If this was a 7A i would say hall sender for sure.

[Azman]

Nope other than on the dizzy. Would suggest that there is quite a boost leak somewhere. Mine did what you are describing when it blew a hose of the turbo. CHeck all the boost lines and vaccum lines matey then give it another whirl. Also check the timming marks are spot on, not an easy job I know and it means taking the front off again. Other thing would be most def the maf (but it would run better tahn you are desribing) and the TPS.
My guess is boost leak.

[S2central.net]

DOuble check timing and for air leaks before spending any mo money...

Checked all the ECU fuses and ground straps ?

TPS or MAF are candidates for sure - see if you can borrow spares.

[20Vcqdriver]

I have a working MAF and not too far from you if thats any help. It isn't perfect but did work ok.

Mark

Might be worth trying. But must be something I have done as this engine was running perfectly in the S2 before it was transplanted into mine. Thanks for help so far, let you know how I get on.

[pixsaudisex2]

Well done on getting all of this in there.. i would aso be tempted to check for leaks with boost pipes as they cause problems very close to what you are discribing.

[Heat Seeking Missile]

Might be worth trying. But must be something I have done as this engine was running perfectly in the S2 before it was transplanted into mine. Thanks for help so far, let you know how I get on.

Drop me a PM when you want to borrow it and we'll arrange something

Mark

[martinjs]

Try it with the MAF unplugged.

[20Vcqdriver]

half sorted

Thanks everyone and especially Mark "heat seeking missile" who provided the MAF to replace my duff one. By the time the MAF was changed I had double checked all the plumbing and wiring. Only issue now is that it does not feel much quicker than my old 7A engine and am thinking it may still be in limp mode or something or does it just need to be driven for a bit. Cheers.

[Heat Seeking Missile]

Glad to have been of some help. I dont know how your ECU was installed or even which one you're running but maybe its still saved the original fault from the ropey MAF sensor and just needs re-setting. I'm merely guessing now I'm afraid.

Mark