R33 S2 Gts-T Engine Dies Randomly, Won't Start, Cas Replaced Issue Continues

[Links]

Afternoon all,

Quick background:

- 1998 R33 S2 GTS-T with minor mods - brant security alarm fitted.

- 120,000 kms

Summary:

- Engine was losing power (would hesitate then pick up) at 1,500 - 2,000 RPM and then died suddenly after having been doing this for a few weeks.

- Electrical's continue to work and immobiliser not kicking in (engine light on), engine will turn over but not start immediately after.

- Starts again after 20 - 30 minutes and runs for maybe 5 minutes at most before dying again

- Fuel pump flowing ok and primes when power turned on, mechanic checked and fuel flow ok.

- Checked diagnostics and returned 11 CAS code (need to check again now it's died again)

- Replaced with second hand R34 NEO GTT CAS from JustJap, mechanic says car ran fine for "30 minutes"

- Picked it up and same issue occurred within 200m where engine died and wouldn't start.

Note:

- Coil packs / spark plugs were replaced approx. 10k ago

Looking to get some assistance in understanding what the issue may be and how best to isolate.

Consideration:

- AFM

- ECU

- Wiring issue

- Earthing issue

- Immobiliser

- ?

Links

[Hadouken]

Vacuum leak

Compression test done?

[Hadouken]

Oh. Coolant temp sensor.

That all I've got really

[Links]

Thanks, not sure why a compression / vacuum issue would see it randomly fail - would have expected it to be more consistent however worth thinking through.

[f4cfed]

Compression I'd say what sort of idle. More of a der der der or a purr if that makes sense

[Hadouken]

Weird things happen sometimes man. If you want to cover all bases then check those things.

[Links]

Afternoon,

Idle prior to stalling was fine, no lumpiness or change in tone.

Quick update:

- have disconnected AFM to see if it would start in limp mode, engineer turns over but no starting.

- checked CAS is connected ok and rotated to see if any difference. No change.

- won't start at all now.

Next steps:

- purchase consult cable so we can see what the sensors are showing

- going to replace field filter and check fuel pressure to make sure issue isn't a blockage.

- will also look at testing CAS again and then start to check electricals and also lines to make sure no leaks etc

[Links]

Update:

- Fuel Filter replaced, no issue with fuel as pushing out when pump priming

- ECU is now showing 55 (no error) and the engine still won't start.

- Next step is to check the wiring and see if there is anything other things broken

[Kane_R32]

Does it just crank, and not even sound like its trying to fire?

I'll just throw these out there:

1) second hand CAS could be faulty

2) disable alarm if possible to eliminate 100% (seen faulty alarms still allow reds depending on set-up)

3) spark issue?
4) timing issue (could've jumped a tooth or stripped ribs on the belt? Worth having a look to see if the cams gears /belt spin while cranking.

[Brady_033]

Sorry to Hi-jack the post Links haha

But I'm currently having the same sort of problem with my S2 33!

Car will die when it gets warm (bit under half temp on gauge) have tried two cas's and a different afm. When car dies it will crank but wont fire but if you leave the car to cool down it starts first turn and will run until it dies again..

[defari]

seriously ditch the brant alarm.. biggest pos... they came factory in my sti... extremely annoying when they are on their way out.

i have the same prob... car is fine when cold.. when its hot it wont start... this is the alarm/immobiliser failing...

there has been some stories of the brant alarm immobilising the engine whilst freeway driving..

Edited October 27, 2014 by defari

[Brady_033]

seriously ditch the brant alarm.. biggest pos... they came factory in my sti... extremely annoying when they are on their way out.

i have the same prob... car is fine when cold.. when its hot it wont start... this is the alarm/immobiliser failing...

there has been some stories of the brant alarm immobilising the engine whilst freeway driving..

Do you think this could be my problem also? I have a Mongoose M80

Edited October 27, 2014 by Brady_033

[defari]

not too sure to be honest..

also, i'm not entirely sure if its the OP's problem either. Just my 2 cents seeing as I have a brant alarm which gives me the sh*ts.

[Links]

Afternoon all,

Thanks for the feedback.

Update:

- Have ordered ECUTalk to be able to look at what is being read from the sensors.

- Based on the ECU returning 55 (all is ok) I am planning to look at disabling or removing the Brant alarm so that we can rule that out.

Given the behavior and everything seems to be ok in general, i'll give the alarm the next focus and see where we go to from there.

[75coupe]

The coolant temp sensor can do what your describing, i had to replace mine in my s2r33 as well... It showed an error on the pfc hand controller as well so consult should pick it up

[Links]

Morning all,

Update in the last couple of days. Received consult cable hooked it up, ecu is showing 55 so no errors being reported.

Turned the car over and it started first go - left it to idle for a while and then have taken it up / down the road while monitoring. Everything was working ok which means I now need to consider heading out for a few longer drives.

Brant alarm keypad isn't lighting up so my thoughts are that there is still an issue and it's the alarm however i'll deal with it shortly.

Thanks everyone for your feedback. Still not confirmed what the root cause was however will see how it goes.

Links

[hairdryer33]

Having same trouble but cold start sounds like an 8, replaced everything time to burn!

[Brady_033]

Did you ever sort the problem out Links?

[Links]

Morning all,

Thanks for the prompt as always good to close out a post.

• After plugging in a consult cable and tracking the data when the car died the ignition was stopping. I called a Brant alarm technician to come and have a look.
• Keypad immobiliser module had a faulty relay which was triggering when it over heated - this was causing the relay to trigger and cut the ignition.
• Crank angle sensor was also replaced which has addressed the loss of power issue so all back on the road.

Links

[defari]

what did I tell ya bloody brant alarms are the biggest pos