s2konroids

Hi, hoping some of you guys could 'chime' in (i love that american phrase

So im going to revert back to stock kinda fell out of love with my S. I'm going to sell my spoon ECU i proceeded to take it out today and put in the old stock ECU. Remember the spoon ECU requires a ground to earth off pin 15 to chasis (FLR (immboilizer). I have tapped a scotch lock onto that a run an 8inch wire to ground no problems as without it wont startup.

So before installing the old ECU i left the very small tap on but removed the wire (thought if i left the wire it could creat noise/interference), the tap doesnt have any exposed connections.

Car struggled to start did and seemed to be hunting for idle, after a few mins o2 sensor malfunction (p131) and coolant sensor function come on, let it settle switched off the car and reset the CEL light. Started up again no problems took it out for a drive to get it to learn and it seemed to struggle to idle when coming to a stop, rode about for a about 5-10min seemed fine upto 3 bars on temp.

I then tried to vtec then thump! at about 7k rpm, then ran like a bag of shit, o2 sensor CEL light on again, none of the other CEL lights came on (o2 and coolant as above). Struggled to idle again.

Tried again as above but same thing crap running, idling but no CEL when hit wall at 7k rpm.

I'm stumped as to what going on, my thinking is possibly the spoon ECU doesnt monitor the lamda etc (Well o2 sensor, as opposed to the stock ECU putting CEL light on about an o2 sensor), so it could have failed but spoon ecu doesnt care but stock ECU does???

My other thought is maybe this why it runs rich after vtec but this doesnt really show a failure on the dyno as it would have a cack AFR throughout rev range, maybe lower down but i remember 'mase' etc saying spoon ECU is set on side of safety.

However on dyno 3000-6000rpm AFR is about 12.8/9 ish jumps upto about 13.3ish then down at 7k rpm to 12.3 and gradually lower to 12 right at the end at 8200rpm (i ahve 4.57r gears). Dont know if this how the spoon work and sets the AFR? or just because of my mods?(megan header, testpipe, k&n fipk, magnalfow backboxes).

On the dyno is made a genuine increase of 16bhp, better lower down (it would do due to fueling) and around 250bhp.

Im stumped any ideas?

Does any know if the spoon ECU uses all the sensor than stock ECU or uses them differenty?

Thanks in advance

AJ

s2konroids

No one?

ahrmike

If you kept your stock ECU properly stored, perhaps some sensors that the spoon ECU doesnt monitor as closely is bad? (like the 02 like you mentioned?)

s2konroids

Thats what im thinking mate, well the spoon doesnt use some of the sensor ie on the o2 sensors on header or CAT.

I think the spoon doesnt use them, they have failed on my own car hence why i go back to stock ECU.

CKit

You may have run rich with the Spoon ECU and fried the stock 2' O2 sensor in the cat? Does it rattle? Sometimes the cat material can chunk off and decapitate the 2' O2 sensor....

negcamber

Might be a better question for Under the Hood...might get some more responses there.

You should try unplugging and replugging in the ecu just in case you're getting a bad contact.

But the 7k redline is undoubtedly due to the coolant sensor malfunction. Recall when you were stock, the car would hit fuel cut off at 7k when the car was cold. That lower redline is set by the coolant temp.

s2konroids

Hi, thanks for your info so far.

I do not run a CAT only a testpipe, so i dont think i have damaged that???

Coolant sensor only came once when i first plugged in the stock ECU, it never came back.

I also remember when i was stock it wouldnt let me him VTEC when cold but my temp was upto 3 bars and when stock is would hit a brick wall at around 6K RPM.

THe only light that come on again was the p131 when i went to 7k and hit a brick wall the car then ran like a bag of shit

ANy other info wecome

Thanks

s2konroids

https://www.s2ki.com/forums/index.php?showtopic=697410

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