Spent another day looking at this today! Getting steadily worse :mad:

 

Stuff done previously:

FPR replaced and fuel pressure checked - OK

EGR system disabled and valve checked for sticking - OK

MAF replaced - No difference

PVPR system removed to simplify system.

Base timing chacked - OK

New 7 range plugs - No difference.

New tank of optimax - No difference.

 

Started today by checking the injector resistances at the ECU (between pin 58 and relevant pin 1XX for each injector). Spec 10-14ohms at the injector.

On Leigh's car all were ~14ohm except no 6 - 15.2 ohms. Cleaned connectors on 1,2,3,6 with dremmel and all dropped to ~12.5 ohms. All connectors at battery voltage on +ve pins.

Now better on Leighs, det only at v. high revs - maybe some milage in cleaning 4 & 5 but they're under the fuel pipes so left for another day.

Suspect injectors just maxxing out on this one.

 

On mine, all at 11.2 - 11.6 ohms, so electrically look OK.

Think now it's either big air leak or a dodgy (fouled) injector.

For info, det is now at ~4500rpm, 10Psi even with JWT chip!

 

Next things to try:

Got PCV hoses coming incase any are split.

Check for air leaks with pressurise manifold method.

Do power balance test on consult to see if it's cylinder specific.

 

Any other ideas ?! Really getting annoying now!

Why don't you try running the car, and disconnecting each injector in turn!

 

Hope I am not stating the obvious by saying it is probably one of the rear cylinders!

Getting a loan of a conZult from a generous member, so power bal test should show it up. Bit better than just trying to listen.

My money's on No 6!!

Getting a loan of a conZult from a generous member, so power bal test should show it up. Bit better than just trying to listen.

My money's on No 6!!

 

What are your odds mate?.

 

I will have score on number 6

Getting a loan of a conZult from a generous member, so power bal test should show it up. Bit better than just trying to listen.

My money's on No 6!!

 

 

Doh ! Shoulda asked earlier, I would have sent mine with the MAF ! (I thought you already had one)

Have you tried Vijay's patented boost leak detector yet? Does boost spike at all? (I'm guessing the Profec will graph it for long enough to go all the way through a gear...)

 

Is there a smell of petrol when cold?

 

And the really obvious... new fuel filter? (Sure you must have done that by now!)

Have you tried Vijay's patented boost leak detector yet? Does boost spike at all? (I'm guessing the Profec will graph it for long enough to go all the way through a gear...)

 

Is there a smell of petrol when cold?

 

And the really obvious... new fuel filter? (Sure you must have done that by now!)

 

Boost leak detector and conZult are the next step.

Boost dosen't spike, anyway, I'm running around 10 psi at the minute :(