Leon Speed

Thanks John.

I am almost ready to call this a mistery I won't be able to solve. I have switched back the metal relays but the symptoms are the same. Spoke with Theo and he will make the diagnostic module less sensitive to electrical noise, something about high impedance. Electro abracadabra Then I can test one last time.

John Speake

Maybe you can beg, borrow or steel a KTS301 Hammer to compare the results ?

Leon Speed

Yes I have sent a request out except for the stealing part hopefully somebody local has one I can use.

ador117

Hello,
I have the same issue on my 88 S4. Did you succeed to get an other diag tool and to verify if the knock count is the same?
Raphaël

Leon Speed

Salut Raphaël,

I did not get any further at this time. I need to fix my starter issue now first before I can start the car again.

ador117

Bonjour,
2 years ago a redo my intake and my knock issue was fix. But today... checking knocks... I can't believe they can be true : 400...
I remember that 2 weeks ago I dropped a washer inside the V. Is this a potential cause for high knock counts?
Leon, did you solve you knock count issue?
Raphaël

John Speake

If the washer is free to move around against the block then yes it might cause noise which would confuse the diagnostic tester. The problem for the tester is that the knock signal are very low level and the sensors high impedance. Were the knock sensor leads in good condition, no insulation missing ? And metal to metal contact to the block can cause problems.

ador117

Bonjour,
I can't believe my car have such an issue but maybe I have to face reality?
Does someone know how much power the car is supposed to loose if advance is limited to maximum?
I will try to disconnect a knock sensor and see If I can feel a loss of power... if not... reality will the there!
Raphaël

PorKen

If I understand correctly, Messieurs Leon and Raphaël both installed later knock sensors with gold plated terminals on earlier cars with plain tin terminals. Could the difference in metals cause knock sensor errors and/or high knock counts?

ador117

Bonjour,
I bought a bore scope. Here are some pics I took from all pistons :








My engine has 207 000km (about 130 000 Miles). There is a clear ring all around each piston... oil going through the rings... I have no experience but does not looks like I have a lot of carbon build up. I used to run 5W40 oil. Now I'm 10W60. I hope the clear ring was generated at the time I used 5W40 oil...
I remember a thread with pics explaining what was supposed to be good and not but I do not find it again.
Your feedback will be appreciated...

And I found the leak in my intake... The Y on the driver side is popping out... afraid I will have to remove the intake...
Raphaël

Rob Edwards

I'm no expert but those carbon patterns look great to me. No significant buildup and the clear area around the perimeter is normal.

ador117

Thank you Rob for your feedback,
Raphaël

ador117

Bonjour,
I bought a Sharktuner and with stock maps and E85 fuel, I get NO knock at all.
To get very few knocks I had to add a lot of advance...
Have a great Sunday,
Raphaël

FredR

Raphael,

Something in your post does not quite add up- one does not "add advance" to get knocks rather one retards ignition to stop knocks from occurring. I suspect this is a "use of English thing" and your intent is to say that "you can induce knocks by adding advance" thus scope for more power development - that would make sense.

E85 is 85% alcohol so its anti knock performance [octane] is excellent [about 110 RON] but its power delivery will be way down as stoich is no longer 14.7 and more like 10 so you have to burn significantly more fuel to realise the potential for increased power delivery. Unfortunately E85 is also a much better solvent and is known to cause damage to some stock fuel system components and our fuel system was for sure not designed with this in mind. As to what may be vulnerable remains to be seen. I understand that E85 and magnesium alloy do not get on well and some rubber fuel system components do not like the stuff either..

The upside is get it right and you can liberate a chunk of extra power with E85. This will typically involve bigger injectors, bigger fuel pump and maybe bigger fuel lines and other fuel system components if their capacity is exceeded. With Sharktuner you can develop the mapping to help realise that potential.

Speedtoys

And what else did you do? Has to be something missing, straight moving to E85 required 30% more fuel than the stock maps provide, and 30% is too far for the LH to adjust.

Stock maps, stock injectors, and E85 is not a valid cheat code...

Way not enough fuel to run that safe.