Hi All,

Can anyone please give me a clue about the following, i've done a search but can find nothing that helps

The car is a MY93 with
Full decat
Z5 ECU
Uprated fuel pump
Samco intercooler hoses
Early Apexi AVC-R boost controller set to 1.0 bar
New plugs and coil packs
Green panel filter

Think thats about it, right on acceleration i always get two greens but every now and then i get the Big red this can be on full or part throttle, i've visibly checked all hoses, tried a different MAF, it was the same on the standard ECU and i've tried a scoobyecu chip in both and still the same, can anyone give me a clue as to where to start looking

Cheers Lee

 

Hmm, is there any blockage in the intercooler? Are the fins all bent? Any other obstruction?

What fuel you using?

Has this just occurred or have you just fitted the KL?

Is the sensitivity on the KL to full max? (should be)

MB

 

Get a remap or get a bigger intercooler, or both

 

Hi, don't think its blocked looks ok anyway, fins are fine

Optimax (tried with millers and still the same)

Just fitted the KL, yes set to full

Cheers Lee

 

Who can i get to remap, was toying with the idea of an uprated top mount, but don't want to waste money if that is not the problem

Any other ideas

Cheers Lee

 

Anyone else got any ideas at all

Cheers Lee

 

Detting must be resultant of:
1) Lean A/F mixture (unlikely with fuel pump upgrade unless MAF is faulty (faulty MAF not so common on your car) Do you have an AFR meter?
2) Timing too far advanced. Your timing is set a bit too far advanced for UK fuel as it has been set up for Jap fuel. Should'nt be too much of a problem with optimax (especially with Booster). Perhaps the combination of advanced timing and increased boost is the cause. But you have tried a scoobyecu and it's still the same. So that might rule out timing.
3) air/fuel charge is too hot due to inefficient intercooler. The slanty cooler is too small for your power output.


One other thing I have read is that a failing MAP sensor can cause this, as it does not respond quickly enough to changes in boost. How this would cause DET I do not know as I thought the MAF was responsible for fuelling.

 

Blocked injectors...

MB

 

Hi, yes i have an AFR and its always blue on WOT
I know the slanty coolers are sh*t, but i did not think 1.0 bar was to high (even seen it at 0.9)

Thanks Lee

 

Cheers MB, can i just use an in petrol cleaner or do they have to come out, one more thing though if my injectors were blocked would my AFR still show rich

Cheers Lee

 

Anymore ideas of where i should be looking Please Help!

 

Anyone else able to help with this one??

 

What Plugs you using?

 

Injectors was a shot in the dark, if one was slightly blocked you might miss it on the AFR.

Some good cleaner might not do any harm.

What's your fuel pressure doing?

MB

 

I'll have to check (HKS i think) but will check

 

No idea what the fuel pressure is, but its an uprated pump

 

Right sorry for the delay i've been at work, the plugs in the car at the moment are HKS iridium S40i gap set to 0.7 i think, also tried NGK PFR7B and these gave the same results

 

Keep the ideas coming please people

Cheers Lee

 

Knocklink activity cause's and cure's here

 

Very interesting thanks but it does not help me that much, i was hoping that some of the very experienced people on here may have delt with similar problems on their cars and could point me in the right direction of what to check or pull apart next.

Thanks Lee

Basically i'm looking for a procedure that one of the top guy's on here would normally follow if they were presented with a similar problem, something that with my limited knowledge i would be able to work through until hopefully narrowing down the problem

 

It sounds like a rolling road job to me, its a bit difficult to diagnose somehting like that over the net. I would suspect some sort of fuelling / sensor problem, but it could be a number of things. Where you based?

MB

 

Harwich Essex

 

The standard Z5 fuel map and ignition timing map aren't really optimised for 1.0 bar of boost and UK 97/98 RON fuel, and as you say, the slanty coolers are a bit on the crap side. That said, the slanty coolers are good for 1.1 bar if they're in good condition.

Other considerations include the MAF sensor beginning to fail, but this normlly shows up as leaning on the AFR. (Maybe it isn't sensitive enough to see it at the moment?)

Would I be right in suggesting the majority of the det occurs at a reasonable throttle around 3,500 to 4000 RPM? (That's 3rd gear at about 60 mph for instance)

I have a few ScoobyECU style maps that would work with your car and provide alternative fuel and ignition maps so you can run the boost you want to on the AVCR. If the mechanical bits & sensors are OK then it should solve the problem... I also have a select monitor that helps to diagnose some of these sort of problems.

 

Hi, i changed the MAF for one i was told was good no change

Yes your right about the det

Personal mail me about this

 

It seems like it occurs on both open and closed loop from what you've said? ie above 0.5 bar boost or WOT.

MB

 

Yes thats right

 

Sorry, I didn't make that clear. It occurs both on and off boost?

MB

 

No sorry only occurs on boost but on half or full throttle

 

You'll have a PM shortly... on boost and half or full throttle sounds like the map area I'm thinking of.

 

Had the same knocklink activity on my MY98 WRX. I was getting the big red led on part throttle when going from a cruise and then flooring it (WOT) in 3rd, 4th or 5th. I also got the occasional red on WOT as well.

I have since changed my lambda sensor as it was dead and now all is well. Only see the 2 greens.

I think it was something to do with the transition from closed loop to open loop operation of the ECU.


Any help?