Hello everyone,
I had a quick play with the CRP 129, only scanned for codes, big thanks to ala_xfire for mentioning to scan it as SLK320

because sod all happened with chrysler.

Here's a shaky vid of it's first scan for anyone interested.


Here's a little history, where I am up to and a few questions....

The car 2004 crossfire 3.2 EGX (a friends) had an episode, cut out and towed to local garage with multiple misfires. Unclear what exactly the garage done or tested but was told the cranksensor was changed and the next (last) step was for the ecu to be sent off for testing, this didn't happen and was now six weeks after the car had entered the garage, so, the car lands outside my house.

I check the codes and have misfire on cylinder 6, Swap coils around clear the code and no more misfire. take her for a spin running fine but when I put my foot down she misses, nurse her home and we've got a miss on 6, the same scenario after swapping leads and sparks, it gets rid of the misfire, road test, put my foot down, misfire on 6.
Can't get rid of the miss on 6.
Checked for spark and tested the loom, all good.
I pull the injectors and find no.6 is very dry with rusty residue, so all injectors get an ultrasonic clean and the fuel rail gets a good clean out, this too had rusty residue spots inside.
All injectors checked out at 14.7 ohms and activated with 12v.
Refitted everything swapped 5 and 6 just to be sure
Cleared the code, misfire gone, then the same thing again fine until i put my foot down, miss on 6.
Check over everything again, injector 6 is firing, but can't get rid of the miss on 6.
Took the maf, intake elbow and throttle body out, it wasn't pretty, the two seals on the elbow were perished with the lower one actually allowing sand and dust in, the throttle valve was baked in treacle.
While I was waiting for new seals and the throttle body o-ring from mercedes I changed the fuel filter, (air filters and oil were done recently) cleaned the maf and map, removed and cleaned the egr valve, checked all vacuum lines and actuators, tested all solenoids, variable intake valves, air pump, tank vent valve.
Still waiting for mercedes so cleans and reseals the leaking crankcase breathers.
I also found a swimming pool when I opened the fuel filler flap, eventually found the drain hose in the wheel arch, so sorted that out.
Had a quick look at the ESP unit wiring and connector (ESP is light on) and found the thicker top four contact pins on the unit side were corroded.
Finally get the seals from mercedes, everything back together, clear codes, misfire gone, same again, foot down miss on 6. I double checked everything all seemed in order, Struggled to get rid of the miss on 6, finally did. Cleared the codes gave it a run, same again, felt the misfire, but this time i kept flooring it and it felt like another cylinder went down then another.... Checked codes and 6, 5 and 4 had all missed.
Cleared the codes, still had the miss on 6, eventually got rid of it, Tried the same again, pushed it and misses 6, 5, and 4.
I'm now thinking blocked cat.
Cleared the codes but still missing on 6.
I remove the pre cat 02 thinking if it is a blockage that should help it breathe a little. The miss on 6 went and hasn't returned even with some good revving, haven't road tested it like this because of the noise and don't want exhaust gases toasting the engine bay.
Hopefully get the exaust off tomorrow and check all that out and report back.

If you're still with me, thank you, and here's the questions
Do these have two cats for each bank?
Fuel pressure on prime and idling is 54psi, at 3000rpm was 55psi, leakdown to 42 psi 30 mins after switch off...Are these normal figures?
What is the difference between 'K' and 'G' leads?
Compression on cylinder 6 is 200psi?
Also,
a leakdown test on cylinder 6 showed 5% loss

The most important thing I have learned from all this is, never say to a friend "I'll have a look at it for you"

If anyone is still reading up to this point..... your medal of honor is in the post!

Here's a vid of the current errors and some pics of my findings.
Tommy.