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EZ30 Not running very well


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On 17/02/2021 at 8:16 AM, ajayel said:

Did you have any luck getting this car running any better @BMCracer ?


No. After tipping in half a bottle of octane booster as mentioned further up this page, each fill thereafter I just filled with petrol. The IAM seemed to stay off 0.000 but never reached 1.00. From memory it ran around 0.3-0.4 for around 6 tanks of petrol.


The other week I had to tow a car trailer with car on, so prior I filled the tank and used the remaining half bottle of octane booster. Very disappointingly the IAM went straight down to 0.000 and stayed there. 2 further tanks of petrol later the IAM is at 0.156.


So the next time I have to tow a car trailer and car, I will try the whole bottle of octane booster, which should bring the octane up by 6 points ( for the full bottle ).


The car should be running better as I moved further away from work, before I lived a lot closer and it was all stop start urban roads. Now it gets a decent run each day and my commute is 30-40 minutes, which is almost exclusively motorway. The dash usually reads around 8.4L/100km


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  • 5 months later...

Hi guys


I got 2 H6 leggies with me and one have an issue similar to this.


Good running one got 200k +

naughty one closing towards 170k


Both 5EAT auto 2004 H6


I tried with running on 100 octane, which is available around the corner from my place down here in Christchurch it has no effect so don't waste your money pumping overpriced 98 in Auckland.


Changed all the sensors and even swapped the throttle bodies between cars. Before this I did all the text book stuff and poured a ton of cash.


Done list

Fuel pump, filter, regulator


Set of injectors (Used)


MAF ( New and a used also tried the one from my other car)

MAP sensor


But strangely enough I got the car to run absolutely fine with the alternator pin disconnected. Otherwise it has this fuel trim issue goes to +25% and burns gas like a tank going to the battle.


I also changed the ECU tuning and got the car to run little bit better by changing injector settings and the MAF readings to read higher than stock values. But still there is a point in certain amount of load where it stumbles.


My other car which runs perfectly has it's air intake cracked just like in these pictures but that seems to not cause any issues. ECU should compensate for that.


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