ECU anyone?

**Edbear** · 31st October 2015, 12:32

A mate of mine has an '04 GSX 1400 and has been mucked around by a guy who is supposed to know what he's doing who has succeeded in making the bike run on three cylinders. After several weeks and many tries, including putting it back to standard spec, the problem is exactly the same.

Naturally my mate is reluctant to continue with this guy. He's asked if anyone on here can fit an ECU from their own bike to ensure the issue is definitely his ECU or with something else. Cylinder 3 is not firing. He's in Whangaparoa.

**AllanB** · 31st October 2015, 12:34

Maybe it is the battery ............

**T.W.R** · 31st October 2015, 15:16

Originally Posted by cassina

Was it running on 3 cylinders before the ecu was mucked around with because if so it may not necessarily be that. Check compression. When my bike only started on 3 cylinders due to not being run everyday I just squirted some CRC down the spark plug hole to get it firing

toolbox in can for ............

Ed do the simple stuff 1st ; swap plugs around to make sure the 1 in #3 pot isn't dead. Check #3 ht lead isn't crook. Work backwards from the fault not forward from what you suspect is the issue

**98tls** · 31st October 2015, 17:38

Originally Posted by T.W.R

toolbox in can for ............

Ed do the simple stuff 1st ; swap plugs around to make sure the 1 in #3 pot isn't dead. Check #3 ht lead isn't crook. Work backwards from the fault not forward from what you suspect is the issue

What he said.....

**nzspokes** · 31st October 2015, 17:48

Originally Posted by T.W.R

toolbox in can for ............

Ed do the simple stuff 1st ; swap plugs around to make sure the 1 in #3 pot isn't dead. Check #3 ht lead isn't crook. Work backwards from the fault not forward from what you suspect is the issue

Agreed. Timing light will help with this.

**caseye** · 31st October 2015, 18:05

Originally Posted by cassina

Was it running on 3 cylinders before the ecu was mucked around with because if so it may not necessarily be that. Check compression. When my bike only started on 3 cylinders due to not being run everyday I just squirted some CRC down the spark plug hole to get it firing

There you go ED. God!@#$ Has spoken.
Sometimes I wish I didn't have to behave myself in here.
Ah fuck it, what the fuck would you know bitch?

**nzspokes** · 31st October 2015, 18:13

Hang on, they are injected? It should throw up a fault code would it not? Ive never worked on one but the below page would say they do.

http://gsx1400fe.co.uk/gsx1400_FAQs_&_fault_codes.htm

**bogan** · 31st October 2015, 18:16

You can do many checks of the sparks and the like, but a check through the OBD plug for codes should tell you what's going on straight way. And it'll be easier to find an OBD scanner than someone to swap in an ECU to a bike you think might have damaged it's current one.

**jonbuoy** · 31st October 2015, 20:32

Originally Posted by bogan

You can do many checks of the sparks and the like, but a check through the OBD plug for codes should tell you what's going on straight way. And it'll be easier to find an OBD scanner than someone to swap in an ECU to a bike you think might have damaged it's current one.

Could be an awkward moment to have two bikes running on three cylinders.

Can the guy not even say if it's fuel or spark that's at fault?

**Edbear** · 31st October 2015, 21:10

Originally Posted by cassina

Was it running on 3 cylinders before the ecu was mucked around with because if so it may not necessarily be that. Check compression. When my bike only started on 3 cylinders due to not being run everyday I just squirted some CRC down the spark plug hole to get it firing

It was running on four until he sent the ECU to be remapped by this guy who was supposed to be good at it and was going to be cheaper than a Power Commander. Apparently, and I am only going on what my mate said, was that remapping a stock ECU requires hacking it. But when it was returned it was only firing on three with raw fuel flooding the inactive cylinder. After several goes at it, my mate sent it back and asked him to set it back to stock.

This was after talking to Brett running the Dyno at Hampton Downs last weekend. Brett said to put it back to stock and give him the bike. He would mount a Power Commander and Dyno tune it.

But on reinstalling the ECU it was still doing the same. He's not happy at all considering he may be now up for a new ECU plus the Dyno tune and PC.

**bogan** · 31st October 2015, 21:49

So, it could be a cock up when reassembling and #3 just isn't getting spark anymore? Or it could be a cock up on reflashing the ECU; did the same guy do the work on both? if so just make him fix it or replace it. If not, put a scope on the #3 coil wire at ECU to determine who's responsibility it is to fix it.