I had a very similar problem. Ran fine until up to temp and then, bang, major misfire, felt like fuel or ignition cut. Checked and changed allsorts. Plugs, leads, fuel filter, injectors untrasonnically cleaned, filter on fuel pump,ā¦ In the end I booked it in to a specialist and, in preparation, put some fuel in, 99 Ron, and bingo. Misfire gone. I couldnāt believe that poor (Iām guessing poor) fuel would cause a misfire soo so bad.
Mine has ran absolutely fine since.
Worth a try.
Cheers,
Geoff.
Poor grade fuel will make the engine run erratically on all 6 cylinders due to the abnormal combustion process generated due to the gasolineās poor flash point and so the knock sensor will send information to the ECU and thus there shall be an error code.
Hi sent you an email explaining the theory of having poor quality unleaded gasoline. If you have taken poor quality petrol or perhaps the petrol was contaminated from that particular station you can drain the fuel tank and add some good quality petrol " super unleaded " ( E-5 ) from a different station and see what happens.
A high percentage of Ethanol in unleaded gasoline can cause an engine to misfire.
If you dont have this you need one
Sorry your emails went into my junk folder. Thanks for all the support. Whatās that there? A diagnostic machine?
Hi yes that is correct, It is the OBD1 to OBD2 scan tool. I am not very familiar with the electronics of these GTOās especially the first generation that I own and that are all equipped with the OBD1 that is connected to the vehicles console unlike the OBD1 so I am still in the learning process. This I bought from BlackStealth on ebay and he is well known in the USA GTO world. So once my engine is ready to be started from its fresh build, I will plug this in and monitor the factory settings. If there is an issue the scan tool will allow me to pinpoint the source by reading error codes stored in the ECU. It also provides real time information regarding the various systems of the engine and its performance when running. I shall be testing it out in a few weeks and perhaps make a video.
