Misfire Problem

[RossB]

What injectors are they Martin? (part number?)

[Martin]

Give me a day or so and ill have them

[Martin]

Denso 195500-0830

Bought from Trust as 720cc injectors.

[Martin]

Anybody else running these injectors?

[Stuie38]

I've just bought some to put in my car.

If Motec haven't tested them I was going to send the injectors to them.

Let me know if they have been tested.

[RossB]

We haven't characterised these but coincedently I have had a couple of peoiple ask about them in the past week so we will probably get one to do. I don't really understand why this would have worked ok before with the in-correct current settings and also the operating conditions where you were getting missfire is not rerally consistant with in-correct current settings. Obviously knowing that you are using the correct setting for the injector would be helpful but I suspect that you could have a wiring issue and the change of current setting has acted like a "band-aid" to the real problem.

[Martin]

We'll its not an injector wiring problem. New wires, directly from ECU were pulled in to trigger injectors and power taken directly from battery.

Ive done everyting to eliminate the harness as problem and the problem was still there.

Out of frustration I tried changing the current setting, (Increased by 1 amp) and it all went away. THere were no open circuit warnings or peak warnings. When I increased the current by 1 more amp i got peak errors.

The car is running well and healthy again, makes 880Nm and 550Kw at about 5000ft altitude (1500m)

[Stuie38]

I will be sending my spare injectors to Ross tomorrow to get them tested. So info will be available soon.

[RossB]

We have tested this injector now and can confirm the settings:
Current 3
Peak & Hold ratio 4
Battery compensation.

Code: Select all

   Fuel Pressure (bar)            
Volts      3   4   5   
10      970   1121   1210   
11      875   1004   1091   
12      878   906   955   
13      826   846   885   
14      773   785   817   
15      745   731   755   


[Stuie38]

Cheers for that Ross.


This may be a silly question, is there a reason why the compensations can only be entered in rounded to the nearest 20??

So 875 becomes 880..