2008 Avensis T180 D-Cat intermittent injector problem

[Makedo]

I have a D-cat T180 which is Jan 2009 registered but is the old model hence I have put 2008. The car has done 146,000 miles with no engine issues , I bought it with full main dealer service history at 80,000 as the car was and still is in excellent condition both inside and out, so to me it is worth a lot more than the actual value, so I would like to keep it running, however it has just developed an intermittent fault which feels like one of the injectors misfiring. 

I asked a friend if he could identify what the fault was and which injector as my reader only said there was an injector problem. His was a Snap-on as he is a mechanic and he couldn't get a reading either. I called the Toyota garage and they said it would cost at least £160 just for the diagnostics but (even before seeing it) said I would probably have to change all the injectors. End of conversation!! I took it to a diagnostic specialist that all the local garages use and they had it for 3 days but even they could not identify the injector as they said the car itself did not tell them.

The only think they could identify was with a mega test was that cylinder 1 had 2 gohms to body while 2,3 and 4 had 10gohms to body. They therefore think it is cylinder 1 but cannot guarantee that will fix the problem.

I have looked at the price of new, reconditioned and reclaimed injectors and the prices are ridiculous. I was thinking of trying to get a replacement injector, then replacing them one at a time, if that does not cure it I will put the old one back in and try the same on the next one but I'll have to by a new reader which will also program the injectors.

Has anyone come across this before and if so did they manage to fix it........reasonably cheaply

All suggestions/advice gratefully accepted.

Many thanks

[Makedo]

As a further update, no issues with the car since the day after I picked it up after it had been to the unsuccessful diagnostic specialist. Last Saturday went for MOT but I was nervous in case the injector played up, but it flew through not even a single advisory and the emissions were excellent.

This has got me stumped.

Could it be an electrical connection somewhere as opposed to the injector?

[Stivino]

Could you describe the fault in as much detail as possible.

[Makedo]

The fault usually occurs when engine gets warm although on a few occasions it has happened as soon as I start it up.

The best way I can describe it, as a past petrol driver, is if one of the spark plugs stops working, so only firing on 3 cylinders.

You get a very rough idle with the vibrations and when driving there is a lack of power.

Some times I get the usual TRC Off and VSC lights along with the engine management light and sometimes none at all even when it is missing.

[Stivino]

If your EML is coming on, are there no codes stored that can be read?

[Makedo]

I took pictures of these the last time I checked so know the top one is a usual one can't remember about the other 2 though

P0200 - Injector circuit open

C1201 Engine control system

P1238 Injector

 

 

[Makedo]

Further update, yesterday was damp and miserable weather, didn't get a mile down the road before it started missing again. No EML or other warning lights showing. Could it be a wiring problem, a loose connector or a poor connection