only half my injectors work :(

Post Sat Oct 06, 2007 4:17 am

just got some feedback from the garage, and since i have fit mega squirt and turbo system, only 3 of my injectors are working. the ones that are seem to be on full wack too! any suggestions.. injection bank wired in wrong or somethin?

jonathan

Post Sat Oct 06, 2007 8:53 am

Did you need to go to a garage for them to tell you the engine was only running on 3 injectors? didn't it feel lumpy?

I'm assuming you've got an M20 with 6 injectors. First i'd check the wiring to each bank.

How long have you been running with the turbo? What injectors are you using? and how much psi are you running? maybe you could have burned out the injectors.

Post Sat Oct 06, 2007 9:45 am

no it was in tha garage for lots of things, but they found this whilst it was there. I have only just done the turbo and haven really had it running at all yet.

Post Sat Oct 06, 2007 11:10 am

How much of the original loom is present? The 12 volt + feed to the injectors is two seperate wires to two groups of three. Common failure at the injector loom plug under the inlet manifold.

Post Sat Oct 06, 2007 12:29 pm

just what i was going to say or you have fried a fet in the squirt

Post Sat Oct 06, 2007 6:44 pm

what is a fet??

Post Sat Oct 06, 2007 6:53 pm

Mosfet amplifier, or as said previously it could be the conector below the inlet manifold

Post Sat Oct 06, 2007 6:57 pm

Field Effect Transistor... basically the electronic switch in the MS that drives the injectors.

It could just be a set-up issue, there's 2 banks of injectors available in MS, they can be set for a number of different firing configurations. Who installed it and set it up?

jk

Post Sun Oct 07, 2007 1:30 am

i installed it with some phone help from ant... havent been able to do anything else since as it barely runs as it it. should all 6 injectors be wired into 1 bank on the ecu? i seem to remeber there was two wires on the car side going into four wires on the ecu, may be it should have been two into two??

Post Sun Oct 07, 2007 7:37 am

IIRC it should be two into two, wires 11 and 12 into white/brown yellow/something the are both thick wires, have a look what you've done and let us know.

Post Sun Oct 07, 2007 10:20 am

cool, thanks

Post Sun Oct 07, 2007 2:09 pm

just to make sure iv got this right... the wires labelled 'injection bank 2' on the megasquirt side should be left free and injection bank 1 should be wired one each into 11 and 12..?

Post Sun Oct 07, 2007 2:27 pm

No, wire both up, bank 1 to odd number cyls, bank 2 to even number cylinders, then its alternating, batch fired as per OE, you cant have sequential as there's no cam synch or need for it in this application

to check the wiring as is, change from alternating to conti in megatune - constants screen, reflash to ECU and the other 3 inj should pop into life.

Post Sun Oct 07, 2007 4:01 pm

ok thanks! ant..think the garage may be in contact with you if they cant fix it by the end of monday, ill do my best to tell them what youve said so far. thanks again for your help!

Post Sun Oct 07, 2007 4:06 pm

Spoke to matey there on Friday Jon, I'll send them another basemap to play with.

Post Sun Oct 07, 2007 7:59 pm

thanks so much, appreciate it!!!!

Post Wed Oct 10, 2007 6:20 pm

just out of interest.. if it is a fet thats gone in the ecu, how easy is it to replace?

Post Wed Oct 10, 2007 6:33 pm

jondrift wrote:just out of interest.. if it is a fet thats gone in the ecu, how easy is it to replace?

99% of the parts in the box are easy to replace, just need to know which ones and get replacements. The bits your after are all in a line down the side of the board, all bolted to the heat sink. Which one only needs a pop onto the msefi website and all the info is there.

Remove, clean, solder, test, sorted

Have they checked to see that it switching on and off?

Can't say I've ever had issues with the injectors & ms on mine, then again Ant did help me fit mine way back in the day. Ignition problems, well that's another long and painful adventure I wouldn't wanna do again.

Post Wed Oct 10, 2007 8:57 pm

lol ive had every problem imaginable so far! to the point where the garage have no basiclaly siad they dont have time to find it so i might have to collect a non running car after it being there for 2 months already!

i have checked every other option and it can only now be down to a break somwhere in the original wiring or a fet. it puzzles me thou as my wiring all worked fine before ms was installed

Post Wed Oct 10, 2007 10:39 pm

Is the plug/socket under the inlet manifold for the injector loom still present?
If it is, then this is the obvious and first place that I would look for a fault that has cut three injectors.

Post Thu Oct 11, 2007 10:28 am

Jon, If you PM with some details I'll see if I'm close enough to help one day soon.

Thansk, Mark.

Post Thu Oct 11, 2007 10:45 am

iv checked that loom your suggesting under the inlet and it seems in good condition.. .

thanks mark, ill send the details now.

Post Thu Oct 11, 2007 11:50 am

PM replied

Post Mon Oct 22, 2007 7:27 pm

ECU back out tomorrow Jon, no issues with it, tested for 24 hours @ WOT, no problems whatsoever dude

check that wiring again !

PS, Stim is in the box, unit is setup for "stim for wheel" change back before refitting to the car dude !!!!!!

Post Mon Oct 22, 2007 11:15 pm

jondrift wrote:iv checked that loom your suggesting under the inlet and it seems in good condition.. .

thanks mark, ill send the details now.

Have you checked under the rubber boot of the lower half of the plug and socket?