FC3C TII Swap Problem
11-01-05, 01:07 PM
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FC3C TII Swap Problem
I just got a TII swap done on my vert by kevin landers. The problem is no TII ecu will work. We tried 2 Jspec n374 ECUs and they would not start up the car. We figured an Aspec ecu would start it right up but kevin didn't have one. So I drove home using the original NA ecu. I got an Aspec n370 ECU and put it in the car yesterday and tried to start it. No luck again... The engine starts to crank and almost catches but just won't. The NA ecu fires up the TII engine with no problem at all.. Anyone got any suggestions?
11-01-05, 01:24 PM
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does push starting it make a difference?
did u swap the whole wiring and engine?
is it a Jspec engine and US spec wiring? or all jspec? or all uspec?
when the car doesn't start.. does it still get fuel and spark? or one of the 2 disapears?
did u swap the whole wiring and engine?
is it a Jspec engine and US spec wiring? or all jspec? or all uspec?
when the car doesn't start.. does it still get fuel and spark? or one of the 2 disapears?
11-01-05, 01:37 PM
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Full blown Aspec TII swap, engine, wiring harness, transmission and rear end. Haven't tried push starting but shouldn't need to and can't right now.(waiting on a return for a defective koyo radiator)
As for the fuel and spark I'm not sure I suspect that may be the case that one isn't happening. How would I check and remmedy this if one or the other is the case?
As for the fuel and spark I'm not sure I suspect that may be the case that one isn't happening. How would I check and remmedy this if one or the other is the case?
11-01-05, 03:05 PM
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pull one of the plugs off stick a spare spark plug in it lay it on the engine and crank a fwe times...
fuel, u can check for wet plugs, smell the plugs for fuel etc...
maybe the engine is flooded?
have u checked compression?
if it's an S5 u can use the fuel cut off method.. or the ATF method...
Maf is secured properly?
fuel, u can check for wet plugs, smell the plugs for fuel etc...
maybe the engine is flooded?
have u checked compression?
if it's an S5 u can use the fuel cut off method.. or the ATF method...
Maf is secured properly?
11-01-05, 03:29 PM
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Originally Posted by Juiceh
The NA ecu fires up the TII engine with no problem at all..
It runs great with the NA ecu. But since it is a turbo engine the NA ecu will not see the extra air and compensate for it at higher rpm. I am fine on the NA ecu while breaking in the engine staying below 4k rpm and laying off boost. But once breakin is done I will need the turbo ECU to actually work so I can boost without popping the engine...
MAF is secured fine.
11-01-05, 03:32 PM
#6
It is not a compression issue, and all the fuel system and electronics work properly. The thing runs perfectly on any s5 NA ecu you want to plug up. But it refuses to run properly with any s5 turbo ecu...we've tried 2 jspec ecu's plus an aspec ecu. What happens is that it is only firing one of the primary injectors with the turbo ecu, while the NA ecu fires both of them normally.
I have read of a few instances of people doing swaps having this problem, especially with jspec ecu's...only one injector firing (because the ecu isn't triggering it) but I've never personally encountered it until now, nor have I ever heard of a solution.
I honestly thought that an aspec ecu would fix the problem, but he says it hasn't, and I have no real further advice until we get some multimeter readings from a few specific areas.
Still, I've done tons of swaps and never run into this problem, and it makes no sense to me. All the ecu pins (that matter) are the same between s5 NA and turbo, all the proper turbo support hardware and sensors were used, so there is no reason this shouldn't plug right in and work.
Let's try and keep the guesses and off the wall replies to a minimum in this one if we could guys.
I have read of a few instances of people doing swaps having this problem, especially with jspec ecu's...only one injector firing (because the ecu isn't triggering it) but I've never personally encountered it until now, nor have I ever heard of a solution.
I honestly thought that an aspec ecu would fix the problem, but he says it hasn't, and I have no real further advice until we get some multimeter readings from a few specific areas.
Still, I've done tons of swaps and never run into this problem, and it makes no sense to me. All the ecu pins (that matter) are the same between s5 NA and turbo, all the proper turbo support hardware and sensors were used, so there is no reason this shouldn't plug right in and work.
Let's try and keep the guesses and off the wall replies to a minimum in this one if we could guys.
Last edited by RotaryResurrection; 11-01-05 at 03:34 PM.
11-01-05, 03:36 PM
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just thought of something...
when u changed between the turbo/N/A ecus'.. are u switching between AFM's as well?
my S4 n/a and turbo AFMs weren't interchangeable when I tried it.. dunno for sure about S5's..
just thought i'd throw that out there....
but shouldn't the car be able to start on one rotor anyway? (i know mine has)
when u changed between the turbo/N/A ecus'.. are u switching between AFM's as well?
my S4 n/a and turbo AFMs weren't interchangeable when I tried it.. dunno for sure about S5's..
just thought i'd throw that out there....
but shouldn't the car be able to start on one rotor anyway? (i know mine has)
Last edited by Ottoman; 11-01-05 at 03:39 PM.
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11-01-05, 06:25 PM
#8
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Ottoman - S4 TII and NA AFMs are perfectly interchangeable. The TII AFM is a little larger and has tighter spring tension. The car will also start without a AFM just turn off right away.
My input on it is - From my swap and others I have read and looked at, some of the JDM wires on the harness can very suddenly even in series. This inconsistence would cause a inconsistence in JDM ECUs. With that in mind I feel the TII ECUs you happened to use were either defective or the JDM ones were along these mix-ups.
My input on it is - From my swap and others I have read and looked at, some of the JDM wires on the harness can very suddenly even in series. This inconsistence would cause a inconsistence in JDM ECUs. With that in mind I feel the TII ECUs you happened to use were either defective or the JDM ones were along these mix-ups.
11-01-05, 06:35 PM
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Problem persists with Aspec ECU's as well though. The Jspec ECU's were also tested in a running TII prior to attempting to use them in my car.
11-01-05, 06:42 PM
#10
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Then the prob lies right where Kevin stated, a multi meter. The only culprits could be wire harness or some sensor the harness is plugged into if the ECU is indeed 100% good.
11-01-05, 06:54 PM
#11
Yes, some months ago I had a customer's car here for rebuild. I also had a stack of s5 turbo ecus (some jspec, some aspec) that I had acquired through trades or purchases, and didnt know the working order of. Since I dont get a lot of s5 turbos through here and hadnt been able to test them, I plugged them into that car one by one and went for a short drive to verify that they all worked. All the aspecs and the jspecs worked the same.
I have also done other swaps using jspec computers in aspec NA cars without issue, including the turbo vert I had about a year or 2 ago.
The jspec ecu's we tried in his car were some of those that I had tested previously, that had worked in another stock s5 turbo II.
The engine wiring harness that was used in this swap, along with the afm and boost sensor, injectors, and all engine parts, were from a local running s5 turbo that was wrecked a few months back and I bought for parts. The damage was light and it was a rollover, so the engine bay was almost untouched.
So basically I have seen all of the parts used in this swap work in other cars, they just won't work together in THIS car. And it doesnt make sense to me.
I have also done other swaps using jspec computers in aspec NA cars without issue, including the turbo vert I had about a year or 2 ago.
The jspec ecu's we tried in his car were some of those that I had tested previously, that had worked in another stock s5 turbo II.
The engine wiring harness that was used in this swap, along with the afm and boost sensor, injectors, and all engine parts, were from a local running s5 turbo that was wrecked a few months back and I bought for parts. The damage was light and it was a rollover, so the engine bay was almost untouched.
So basically I have seen all of the parts used in this swap work in other cars, they just won't work together in THIS car. And it doesnt make sense to me.
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