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Homebuilt GC8 for Time Attack
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Old 12-12-2018, 08:31 AM   #161
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Quote:
Originally Posted by TerryJr View Post
sorry man. i got no advice. Luck has always just been on my side with wiring
It's first serious wiring-related project for me, I didn't expect it to be smooth )))
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Old 12-12-2018, 08:40 AM   #162
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Quote:
Originally Posted by Ted View Post
Lack of combustion event could very well be bad gas. Being as cold as it is up where I am, I have to deal with bad gas after a car sits for 6 months. Ethanol likes to collect moisture. Get 5-10gallons of good gas, a bottle of heat or any other moisture preventitive and dump that in the tank before trying to find a problem that doesn't exist. Crank it over a fair amount so you can pump all the nasty gas out of the rails and lines.
I'm in Cyprus, it's around 10-12 deg C during the nights here right now.. So not cold at all to have cold start problems.. Anyways, fresh fuel might help...

Quote:
Originally Posted by Ted View Post
If it doesn't start then, pull your plugs and compression test it. Yes it sucks, but again, no need to chase a wiring problem if you have a few dead cylinders. Odds are good it isn't this as most low compression cars still fire on the good cylinders.
Car was running fine three years back. I changed timing belt and valve shims. Timing assembled according to manual, engine spins freely with noticed evenly spaced compression phases, everything seems to be OK. On the electrical and control side of things there's much more stuff changed. New style inlet manifold, all sensors, ECU. That's why I mainly focused on this...


Quote:
Originally Posted by Ted View Post
Assuming you have done both of those, back probe or stick a noid light on an injector. If you see a signal and they are not clogged carry on.

Pull a plug and a coil pack and ground it on the block, turn over and check for a spark.

As for the cam sensor, which should fire your injectors in this case, the best way to test this would be an oscilloscope. A multimeter will show a switching signal (depending on the tooth count ) but an o-scope would be more accurate.

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Thanks! Will try to spend some time testing today.
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Old 12-14-2018, 12:57 AM   #163
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Updates!
good news and bad news.
Bad news - car's not running yet.
Good news - fixed several problems and managed to limit further scope to fuel issues.

First. If you dealing with early COP cars make sure that you remember that ignition channels in ECU pinout are numbered by firing order, not cylinder numbers!!! With this in mind, coils on the schemes are numbered by Cyl number, because why not?
Anyway... My fault. Checked numbers of connectors on the diagram and it's quite obvious which pin is which cyl...
Second - with any car make sure that after trying to diagnose power distribution and inspecting fuses condition you actually put all the fuses back before trying to start the car. Not an easy thing to do, I understand, especially if you working mostly at late nights and occasionally leave the car in the middle of something for a few days...
Spark check was a success, we have a spark. After that I tried to start the car on brake cleaner and it fired up immediately! Oil pressure is fine, so I decided to drain old fuel... Drained it all until pump started to work dry, added 10l of fresh fuel, put everything together and decided to try starting it next morning because it was 2 AM and car has no exhaust after turbo...
Today before leaving to office I tried to start in but unfortunately nothing happened... Still cranking and no starting..

So plan for today is injectors!! They are yellow STi 440s. original and old. They were cleaned and flow tested, but it was in 2015... will try grounding them at ECU checking wiring and operation at the same time by looking at pressure in the rails... My friend has some 800cc ones, maybe worth swapping them in. After making sure that stock ECU survived my patch harness I swapped it with ESL one, so I can change anything now..
Managed to log the car during cranking - log has good TPS, inj pulse, IAC signal, RPMs are 175, volts are around 10 from my new lithium battery... All looks fine (to me) except for MAP which is not changing for some reason.. anyway, V4 and v2 MAP have different scales and should be not necessary for the start.. Need to disconnect it at all next time...

Last edited by -mav-; 12-14-2018 at 01:00 AM..
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Old 12-14-2018, 02:29 AM   #164
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It's a start!
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Old 12-16-2018, 11:49 PM   #165
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Quick update - all four injectors were stuck completely, swapped them with old 380cc from V2 manifold and car started up.
I recalibrated map sensor and IAT, all work fine although IAT is not used in the tune yet.
Only issues I see now is idle problem - rpm cange up and down in quick bursts, sound like car gas rotational idle if I disconnect idle control valve it goes away. Also turbo sounds funny. It's very loud and sound comes somewhere from downpipe. It's distinctive whining turbo sound like car has open turbo exhaust, and it increases on any slight rpm increase from idle. I wonder if turbo actually got damaged in that valve drop incident...
Looking forward to road test soon...
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Old 12-21-2018, 06:10 AM   #166
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So, the car successfully made it to new garage location. I thought that I fixed idle issue by adjusting TPS a bit, but issue came back again as soon as I took off from my old house... Didn't have time to stop and fix it, so I drove like that with idle at 2000RPM at traffic lights )))
It was a bit of risky because car was fully loaded with spare parts and garage stuff for the move, there was literally zero free space inside and in the trunk, but previously I only drove it like around the block in residental area... Anyways, the drive was pretty short and car made it!
It needs tune because now it runs crazy rich, but I had no time for further tweaks.. most likely it will be left as is until beginning of 2019 when i'll start preparing it for new season..
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Old 12-22-2018, 01:23 PM   #167
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Glad it made the move!
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Old 02-15-2019, 10:22 AM   #168
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Working on the car every Saturday for about 4-5 hours... not enough space in my garage for all my stuff. Every time its a challenge should I actually do anything on the car or try to organize things around...
Getting more time to work is nearly impossible because my garage is at the property that closes after 3 p.m. on Saturday till Monday and during the week I'm busy..

I managed to figure out couple of issues with ECU and wiring.. Got to figure it out by trial and error, not the best way.. Somehow my IAC valve's "open" and "close" wires ended up being switched over. Can't understand how it happened because these two pins are the same on V2 and V4 ECU.. probably got them wrong while merging engine harness connector.. Anyway - i swapped them over at ECU plug and now car idles fine.

Also it seems that TPS wants to be in some specific range on idle so car can run happy. Trying to figure out all ESL ECU settings, adjust fuel pressure and so on... right now car woks great fully warmed up. Definitely trying to figure out this stuff without any prior experience and on the engine that never worked in this configuration is not the best way to go...

While I was trying to figure out ECU, car started to leak coolant and oil...

Coolant leak was due to a loose clamp on heat exchanger - easy fix, but oil leak seems to be the cover on the back of the engine... So it means the gearbox need to come out. bad news, probably will take the car to a shop for that, because in my garage it will be quite a hard thing to do...

New flywheel bolts and other parts already arrived this week to do all seals and covers on the back of the engine, but I want to do whatever I can myself to limit work scope for the shop to minimum..

And for now there are quite a lot on "to do" list:
- oil pressure sensor wire got burned on the exhaust and shorted;
- brakes need bleeding;
- BC inverted coilovers need to be re-greased and serviced;
- new fuel pump install;
- new 850 cc phase 2 injectors are waiting for adapters to be installed;
- GD bucket seat base needs modification to GC floor;
- clean up wiring mess after troubleshooting;
- wheel alignment;
- ECU tune,
- MOT (road-worthiness test to be able to drive it on the street)

these are major tasks without even touching anything cosmetic and lots of misc stuff... But it's moving forward

On add a bit of positive stuff - I went to a trackday with MR2 and had some proper fun Trying not to forget how to drive.
There was nice variety of cars there including including this drift GC8 with S62 engine:

And this properly prepared hawkeye:
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Old 02-15-2019, 10:56 AM   #169
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My Best/most fun session of the trackday
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Old 02-16-2019, 11:15 PM   #170
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Awesome pics! What a day. I miss the track.
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