Injector wiring......

[Hedgehopper]

I've got an ongoing misfiring problem with my '97 Griff. I'm beginning to suspect the injector wiring. Tie-wrap melt test suggests that all cylinders are firing but it doesn't sound like it.

Are the eight injector electrical plugs permanently connected into the engine wiring harness?

Or, is there a multiplug connection somewhere, if so, where?

If I remove the plenum to access the injectors how can I test that they are servicable?

Any help will be appreciated.

[Hedgehopper]

Thanks for the replies.

I shall check the ECU pins and 'clicking' at the injectors next.

I have done a very thorough check of the ignition circuit replacing all parts with either new or known
good items. Have, as suggested, tried with and without extenders.

What makes me suspect the injectors is that the ECUmate shows a lambda fault on one bank. The lambdas have been replaced but the fault code remains. Therefore I suspect that the lambda is being affected by un-burnt fuel. The engine has a regular 'beat' at idle and shunts badly up to about 3000rpm. Also, very occasionally it drops to what seems like half power as if a whole bank of injectors has dopped out. Turning the ignition on and off reverts the engine to full power but is still uneven as before.

Plugs look similar to each other and tie-wrap test melts on each exhaust outlet equally.

[Hedgehopper]

Thanks all once again.

I'm going to check out the injector firing next, if that doesn't sort it it's off to TVRSS to see what Col can do.

[Hedgehopper]

That's an interesting idea Paul. I have found the two connectors whicn Carsy has just mentioned. They are underneath the fuel rails beneath the plenum. This is where TVR extended the loom forwards to the two lambdas so might be able to swop left to right at that point.

[Hedgehopper]

I have not swopped the injector wiring over but have swopped the actual lambda sensors. However, the fault code stays the same.

Thanks for the suggestions.

[Hedgehopper]

^^^^^^

davep, thanks for all of the above, it makes interesting reading but I have to admit seriously stretches my knowledge of electronics! I am slowly working my way through the wiring of the injectors but of course I may be wrong and the fault could be elsewhere.

Thanks to everyone else who has offered help and ideas...once it is sorted I will post the result in, hopefully, the not too distant future.