High CO and MOT fail M100SE 1991

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Re: High CO and MOT fail M100SE 1991

Postby chrism » Tue 21.06.2022, 16:07

That's good news!
When you 'go 1499' expect fewer worries with MoT/emissions and much better fuel economy...
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Re: High CO and MOT fail M100SE 1991

Postby RonR » Tue 21.06.2022, 19:47

Rich, You have mail....
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Re: High CO and MOT fail M100SE 1991

Postby Richmmm » Tue 19.07.2022, 22:56

Just a quick update about my car.....I fitted one of Ron's MEMCAL adapter PCBs, which are loaded with 9930 and 1499 programs. I also fitted an O2 sensor. It is currently running 9930.

The car sailed through the emissions test for the MOT today, the CO level was down to 1% from 6% with the old 9929 PROM. i will try 1499 in the next few days.

So relived the car got through the MOT!

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Re: High CO and MOT fail M100SE 1991

Postby chrism » Tue 26.07.2022, 08:54

Yep me too :) - except I jumped to Ron's 'full fat' 1499 option from my original 'dinosaur' 9239 MEMCAL'd SE

_DSF0349a.jpg


Over-fuelling open loop 14:1, ~25mpg, smelly + sooty exhaust...all those things have paled to become closed loop 14.7:1, ~38mpg-around-town-and-late-40s-on-a-run, closed loop.

I had to get a 'sparky' to finish off the incomplete wiring - and that turbo plug was a real battle - but it's been the best of upgrades that has taken away all my MoT emission fears :D. There's absolutely no performance loss, either.

If you've got an SE with the later loom (I gather many have...) I reckon Ron's dual pcb plus an O2 sensor is a no-brainer!

(ps I'm not convinced the 9930 MEMCAL should recognise your O2 sensor(?) - but with the jumper switch in place (it's the little black bit in the middle of my pic) I'm certain the 1499 option will...)
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Re: High CO and MOT fail M100SE 1991

Postby Tuga2112 » Tue 26.07.2022, 09:57

where can i find details about this pcb you mention ?

i been pondering about getting a mountain chip for years, and right now im 90% convinced on getting one, BUT ive seen written somewhere you cant get them anymore... im a bit at a loss.
1991 elan se
1991 elan se project
91 MR2 Turbo (import) project
94 Celica GT4 (Import)
94 4Runner
98 Celica SR

too many projects. not enough sunny days :(
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Re: High CO and MOT fail M100SE 1991

Postby chrism » Tue 26.07.2022, 12:14

Hi Tuga2112, I'm a newbie and was disappointingly late to the Mountain Chips party...

I'm really hoping there'll be a 'Son of Mountain Chips' or a Part II revival so's I can get a fix too... :(
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Re: High CO and MOT fail M100SE 1991

Postby chrism » Sat 20.08.2022, 20:55

Tuga, read RonR's post on p2 of this thread. He developed the dual pcb :)
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Re: High CO and MOT fail M100SE 1991

Postby Tuga2112 » Mon 22.08.2022, 13:27

chrism wrote:Over-fuelling open loop 14:1, ~25mpg, smelly + sooty exhaust...all those things have paled to become closed loop 14.7:1, ~38mpg-around-town-and-late-40s-on-a-run, closed loop.


i used to get 36mpg around town open loop. and 40 on a very good run.

after doing the head gasket and resetting the timing to "factory standard" 16 ahead of TDC its done 32 around town and 38 on long runs.

its a considerable differencw you got. but it seems to me i will be trying to adjust my timing for now and hopefully soon Ron will have an upgrade version of he's PCB instead.
1991 elan se
1991 elan se project
91 MR2 Turbo (import) project
94 Celica GT4 (Import)
94 4Runner
98 Celica SR

too many projects. not enough sunny days :(
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