Russell Ormerod

I dont mean vvt. I mean the physical valve timing between crank and cam. You need to remove the cyl head cover and check the timing marks on the camshaft. Obd is a generic diagnostic protocol. Which uses the same communication commands for all obd complaint cars it is only used for engine ecu communication and is very limited in way of in depth diagnosis. Your car is not obd compliant! But your car is very much diagnosable using the MB protocol KWFB i think it is. The launch will be able to communicate with HFM and you will see all the data u need. Air mass.. coolant temp.. throttle position. Air temp.. Batt voltage.. status if throttle end stop is programmed yes/no and many more.

Russell Ormerod

If the cpr123 is only an obd2 scanner then it will not communicate! U need to ask the supplier what will work. Possibly the129 model

Kanishka Prasad

and one more question russel !! my car backfires from the inlet does this mean that its mixture is lean ? or is i the other way is it rich !!

Kanishka Prasad

http://http://blog.obdtool.co.uk/launch-creader-crp129-vs-crp123-black-vs-crp123-red/

please can you kindly visit this link !! and see the spec of the scanner !!

Kanishka Prasad

and yes i removed the valve cover and check the timing marks they are in correct positions and i check for the crank sensor magnet also for debris , dirt or dust but it was also clean !!

and one more thing russel this person had successfully connected a cheap obd2 elm327 which i also have , and he was success

http://www.hfmscan.com/en/mercedes_diagnose_ELM327.html

thanks

Russell Ormerod

Backfire into intake is a sure sign of lean mixture.. to me non of those scanners look like they will work.. ( i use x431) but the hfmscan looks interesting and cheap. Maybe give that a try. Download hfmscan.exe and use a KKl cable. Looks like it will work.

Kanishka Prasad

unfortunately that scanner is out of my budget and right now im so frustrated and lost spending too much money on this !! i could have bought a new engine with an ECU :/ !!

any other scanner you think that could work ?

Russell Ormerod

Try hfmscan.exe have a look on YouTube seems to work like the genuine tool. For around 45$

Kanishka Prasad

yeah !! i have the OBD2 ELM 327 with the 38 pin adapter !! i still couldn't try that on my car !! but i tried it with my uncles car whic is a c220D 1994 but it dint show any data !! it said no OBd interface !! may be because of diesel and different engine management system !!

ill try and let you know !! thanks you friend !! and please check your email !! i

Russell Ormerod

Maybe u connected wrong. ALL w202 models were diagnosable from start of production. Which is around 93 I think. I have never ever seen a hfm pms or edc on 202 that's not diagnosable. I have worked on hundreds of them. I have never used hfmscan but from what I see it looks good

Kanishka Prasad

so i have the 38 pin adapter and on the other side its the obd2 adapter i directly connected it to the 83 pin port and the scanner ? whats could go wrong in that connections ?

Russell Ormerod

Make sure pin 4 on 38 pin actually connects to pin 7 on obd

hfmscan

Hello all!
1. your HFM ECU 2.0 Japan.
2. your ECU have not immo.
3. ELM327 will not read your engine.
4. Use VAG COM 409.1 (cost 5$ on www.ebay.com) or any USB KKL for read your engine with hfmscan.
5. On my site is proposed modified ELM327, which supports only the old Mercedes and nothing else...

Mike.

PS: https://www.youtube.com/results?search_query=hfmscan

Russell Ormerod

Makes sense. Usb KKl cable is your answer mate.

Kanishka Prasad

thanks alot friends !! i was following you website alot !! so i made an order !! will take some time !!

and Russell is also helping me alot with this problem !! and i really appreciate for both of yours tips and help specially your time !!



so as far as i have diagnosed i feel that it lean !! backfire at intake as russel mentioned !! so until the scan comes can you roughly tel what areas are responsible for this particular problem !! with experience of both of you


i replaced the fuel pressure regulator from the company !! 250$ :/

thank you !! guys !!

Kanishka Prasad

yeah i made an order mate !! thank you !!

Russell Ormerod

Well I think your scan test with relevant codes and looking at live data is going to help us fix your issue. A lean mixture is almost always caused by an airflow sensor. But I have seen a similar condition from a faulty o2 sensor. Just unplug o2 sensor and retest, other causes of lean mixture will be low fuel delivery. A coolant sensor that over reads. Or a large air leak. Very retarded ignition timing can also do it but the only way ign timing can shift is if the segments on the flywheel is damaged or the flywheel is fitted incorrectly in relation to the crank. Bad throttle can also make the engine feel lame. But all these things will be quickly diagnosed with hfmscan. Goodluck

Kanishka Prasad

thank alot mate !!

Russell Ormerod

Let me know how the hfmscan works. I may order hfmscan myself. Although I work on many different hfm systems. So not sure what files I would all need. I already have KKl cables. I.'ll test when I am back at work.

Kanishka Prasad

probably ull need the hfmscan.exe as i think !! and the drivers !! i saw mikes posts on his website http://www.hfmscan.com/en/mercedes_d..._kkl_soft.html!! thanks alot mate !! and yes please do share the new results !! im learning alot from you !! and lets hope this thread will help some one else too !! thanks again bro !!

Kanishka Prasad

Russel i remove the first o2 sensor socket and the inlet manifold backfire dint occur and black smoke also stopped !! but the engine miss fires and again the VVT solenoid is not working i'm sure i rewired it !! it gives 12 v from one pin ground to earth but when i keep both multi meter probes one connector pin 1 and 2 its shows me 0.1 - 0.2 varying voltages !! and once its started ti work but gave a rattling sound !!!

the HFM ignition retard knob is at 7 in mine !! i have an engine miss now !!! the mixture problem is solved as i feel because the spark plug are whitish color !!

Russell Ormerod

Trim plug should be at pos 1
Vvt should have 12v on one of the terminals with ignition on at all times.
The ground is only there when the ecu decides to vary the timing.
Forget about vvt for now it will not cause a misfire. Misfired occur more easily with a lean mixture.. when does it misfire? At idle all the time or only under load? Next step determine what cyl is the misfire on... swop the suppressor and or coil to a good cylinder to see if misfire shifts to another cyl... you can pin point your problem that way. Leave o2 disconnected for now.

hfmscan

regulator price 30-50$



in this case it is better to buy ELM327 WIFI\USB for mercedes.
HfmScan through this adapter reads any 104 and 111 (HFM \ PMS) at once and do not need to buy anything more.
plus engine diagnostics with the phone\tablet...

Kanishka Prasad

it miss fires is at idle and under load !! plus the throttle is not responsive until i press it half way down !! then the RMP goes up to 4300 and stay there and it fluctuates there give huge misfires !! i did tried what you mentioned i interchanged the coil packs to see the spark !! but i cant see any difference , its simultaneous !! !! each ht lead has a response when i remove it !! at this moment i dont get black smoke or bad Oder because i remove the o2 sensor !! i feel that m TB has a crack in the graphite strip !! or worn out metal leads !! :/ the rpm has very slight unnoticeable fluctuation at idle compared to before state !

now my main problems are

engine miss
wont rev more than 4300 rpm
poor throttle response !!

thank you

Kanishka Prasad

wel mike i ordered a kkl cable from ebay !! so what sort of modification have you done to the scanner adapter !! ? like whst speacial in it !! why doesnt the normal ELM327 adapter wont work with older mercs !! ??!!

and yes the fuel pressure regulator i replace i bought it from the mercedes company !! it was around 25000 LKR from my currency which is equal to 250$ because the after market parts we have in Srilanka is not that much quality !! so i wanted not to have loop holes again in my new replacements so i cant diagnose it !!

thank you for the reply appreciate it !!