Code 12. but getting light coming up and missfire

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Re: Code 12. but getting light coming up and missfire

Postby HJ2 » Thu 02.08.2018, 16:08

You ae correct!
And it’s not even an upgrade as there is no additional performance.
However available ;-)
If you always do what you always did, you always get what you always got
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Re: Code 12. but getting light coming up and missfire

Postby Brit-Car-Nut » Thu 02.08.2018, 20:52

Your ignition control module package made it to your post office.
https://tools.usps.com/go/TrackConfirmA ... kingnotify
HD Replacement Shift Cables and Short Shift Kits still available
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Re: Code 12. but getting light coming up and missfire

Postby Tuga2112 » Sat 04.08.2018, 12:12

Brit-Car-Nut wrote:Your ignition control module package made it to your post office.
https://tools.usps.com/go/TrackConfirmA ... kingnotify

Got them now.
will try to find the willpower to fit one in the yellow car over the weekend
1991 elan se
1991 elan se project
91 MR2 Turbo (import) project
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94 4Runner
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Re: Code 12. but getting light coming up and missfire

Postby Tuga2112 » Mon 06.08.2018, 11:09

modules installed in both cars,
im a bit tired of waiting for coils to be sourced from the UK, so i just ordered a couple sets from rockauto, with an estimated delivery of 5 working days i cant complain.
soon i will be 100% sure of what is going on with the car.

i started it after replacing the module and it had a missfire as soon as it started. then it ran without missing a beat for 2 minutes to find the iddle, and another whole minute while iddling witout missing a beat.
this is all cool, but considering there has not been any rain for a while, i assume a cracked coil would appear to be running fine.
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: Code 12. but getting light coming up and missfire

Postby Tuga2112 » Thu 09.08.2018, 21:15

ICM fitted (as previously mentioned. and also got new coil packs installed.
the issue persists.
skip to 1:50 to see the problem.
link to video

(seems like video embeding is not working for unlisted videos ?)

I did check resistance between the CAS connector and the end that goes into the ICM. and got 0.7 and 0.8 on the orange and white wires.
I have checked in the past the ground connections on the ICM. although i didnt test while wigling the wires.
been wondering if this could be a fuel filter issue... the other thing im going to check is to confirm if theres any grounds related to this circuit that may have bolts not tight which could cause some electrical gremlin faults of this kind.

all help appreciated.
Last edited by Tuga2112 on Thu 09.08.2018, 22:55, edited 4 times in total.
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: Code 12. but getting light coming up and missfire

Postby Tuga2112 » Thu 09.08.2018, 21:53

on facebook i have been suggested to look into the HES (hall effect sensor)

tomorow. i shall canibalise the blue car for its HES to find out if that is the problem. still, other ideas are welcome.
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: Code 12. but getting light coming up and missfire

Postby GeoffSmith » Thu 09.08.2018, 22:08

Pound to a pinch of s**t it's electrical.
If you look carefully, the rev counter and warning lights are all over the place. Were you running ElanScan to monitor the battery voltage? Maybe an earthing issue or possibly alternator.
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Re: Code 12. but getting light coming up and missfire

Postby Tuga2112 » Thu 09.08.2018, 22:19

GeoffSmith wrote:Pound to a pinch of s**t it's electrical.
If you look carefully, the rev counter and warning lights are all over the place. Were you running ElanScan to monitor the battery voltage? Maybe an earthing issue or possibly alternator.


i did notice the rev counter seemed a bit odd.
but as far as warning lights. only the alternator one was constantly on. and the engine did came on and off when the missfire happened.

as i mentioned before
the other thing im going to check is to confirm if theres any grounds related to this circuit that may have bolts not tight which could cause some electrical gremlin faults of this kind.


im also wondering if its a bad earth. possibly something that was not connected properly when i fitted the top and plenum after changing the head gasket.
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: Code 12. but getting light coming up and missfire

Postby Rambo » Fri 10.08.2018, 09:57

Alternator light should not be permanently on but this may be another issue ?

PS I do have an alternator light on permanently on my yellow car but it has been checked out and the alternator is providing the correct charge to the battery. It us due to an incorrect diode pack or rectifier
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Re: Code 12. but getting light coming up and missfire

Postby Tuga2112 » Fri 10.08.2018, 10:01

Rambo wrote:Alternator light should not be permanently on but this may be another issue ?

PS I do have an alternator light on permanently on my yellow car but it has been checked out and the alternator is providing the correct charge to the battery. It us due to an incorrect diode pack or rectifier

yes, mine is likely the same issue. I have checked voltage between "ign" terminals when the car was running last week and i was getting a little over 14 volts. proving that both alternator works, and the dial in the cluster is fairly accurate.

im not conserned about that one.

Its a bit of a hipocrisy to say this but im trying to "fix one problem at a time" (yes.. at the same time im actively updating a thread on brakes because the MOT failed on that)
lets rephrase that to "fix one problem at a time within an isolated system" :roll:
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: Code 12. but getting light coming up and missfire

Postby GeoffSmith » Fri 10.08.2018, 15:03

Tuga2112 wrote:
GeoffSmith wrote:Pound to a pinch of s**t it's electrical.
If you look carefully, the rev counter and warning lights are all over the place. Were you running ElanScan to monitor the battery voltage? Maybe an earthing issue or possibly alternator.


i did notice the rev counter seemed a bit odd.
but as far as warning lights. only the alternator one was constantly on. and the engine did came on and off when the missfire happened.

I meant that the warning light intensity resembled a Christmas tree João! :D

I've now watched it a few more times at quarter speed from ~1:46 and I think it's the alternator: The charge light increases in intensity (low volts at the regulator pack) then the seatbelt warning light decreases in intensity (low battery voltage), the CEL light comes on, the rev counter starts bouncing all over the place and it starts miss-firing. This is consistent with something (probably alternator) dragging down the battery voltage transiently sufficient to cause major issues with the ECU sensors and drive signals. In fact the CEL light coming on then going off is probably the ECU undergoing a power on reset.
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Re: Code 12. but getting light coming up and missfire

Postby Giniw » Fri 10.08.2018, 15:08

(Is there a seatbelt warning light on the UK Elan?! I don't have one on mine?!)
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Re: Code 12. but getting light coming up and missfire

Postby Tuga2112 » Fri 10.08.2018, 16:17

Giniw wrote:(Is there a seatbelt warning light on the UK Elan?! I don't have one on mine?!)

yes, although mine had the wiring rusted through completely.

when i fitted the rebuilt interior i required it. thats why it works in my car now. I didnt know it existed untill i took the seat out because it only switches on IF the connection to the lock is established
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: Code 12. but getting light coming up and missfire

Postby Giniw » Fri 10.08.2018, 16:38

Strange, I never knew that.
I will have to have a look at mine ^^
Thanks!
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Re: Code 12. but getting light coming up and missfire

Postby Tuga2112 » Fri 10.08.2018, 23:27

GeoffSmith wrote:I meant that the warning light intensity resembled a Christmas tree João! :D

I've now watched it a few more times at quarter speed from ~1:46 and I think it's the alternator: The charge light increases in intensity (low volts at the regulator pack) then the seatbelt warning light decreases in intensity (low battery voltage), the CEL light comes on, the rev counter starts bouncing all over the place and it starts miss-firing. This is consistent with something (probably alternator) dragging down the battery voltage transiently sufficient to cause major issues with the ECU sensors and drive signals. In fact the CEL light coming on then going off is probably the ECU undergoing a power on reset.


could this alternator behaviour be caused by the alternator belt not being tentioned enough ?
when i refitted everything after the head gasket change, the alternator belt tentioning was extremely dificult. so im wondering if its not done properly.
its possible i have plugged smoe earth wire in the intake plenun not tight enought or something on those lines.

EDITED
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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