Online Diagnosis

[Sydneyactionman]

I bought an R32 GTR 3 months ago & don’t drive it that often to give you an idea I just filled the tank this week for the 1^st time since the 17 Feb when I bought it.

It was running fine up until about a month ago when it started to run at about 70% then I went away for about 3 weeks in that time the battery went flat so I charged it. Then the car was running good for a few days but this week it went bad again & is running at about 50%.

Some of the symptoms are excessive Back fire, missing, popping sounds from the engine like ping or off timing. So far I’ve checked 3 of the 6 spark plugs & it looks to be running a bit rich as you can see from the photos 1 of the plugs is really bad, much more fouled than the other 2.

I thought the problem may be due to the car sitting around for so long & being a tight arse by filling the last tank with Regular unleaded on the 17 Feb (3 months ago)

Has anyone got any ideas on what I should be looking at checking or replacing before I tow it to a tuner or someone who’s going to charge like a wounded bull to change the spark plugs or something easy like that?

I don’t think it’s a major problem so any opinions or ideas would really be appreciated.

[paulr33]

just do the basics and try again

reset the ecu

check the plugs

put in some new fuel

check battery voltage

try unplug 02 sensors

if still no good, go see a mechanic

[shotter]

For the sake of $25 get yourself some std copper plugs and put them in.

[Beer Baron]

filling the car with regular unleaded has quite possibly f**ked your car. it should be run on 98 RON premium fuel ONLY. mate if you only do a take every 3 months then it's not like the cost is massive either. remove the shit fuel from the tank (just remove the fuel return and pump it into a jerry can using the fuel pump), and re-fill with proper fuel. buy some new BCPR7ES plugs and check the gaps (should all be 0.8mm). install them and hope for the best.

[R31Nismoid]

Wow... regular unleaded in a GTR

Suppose i have heard everything now!

[blind_elk]

GT-Rs do not likely "iffy" batteries. Letting the battery go flat is just asking for trouble.

[femno]

You do know petrol has a shelf life of about 30 days?

Shit petrol + OLD shit petrol = Leanout and Pinging

The ECU has probably tried to save the engine by richening everything up, that why you could have black plugs, but still cant burn the fuel because its old and shit.

Depending on how much you let it ping and backfire your 50% could be 3 cylinders broken. haha

[R31Nismoid]

Petrol does not have a shelf life of 30 days.

Shell has on thier own website that their fuel is OK for upto 6 months.