All Things Mk5 > How to Guides / Troubleshooting

Couple of issues

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csrigo:

--- Quote from: Pudding on November 16, 2018, 07:01:04 pm ---Is it missing/lumpy all of the time, or just when cold?  RFD does apparently cause cold start roughness, but should smooth out when hot.

Glad to hear it's driving better  :happy2:

Keep us posted on the misfire.  I'm not convinced cleaning the injectors does a lot personally, and it's certainly not a long term fix.   I'd be interested to know if R-Tech test them properly with varying PWMs across the full pressure range of 45 - 130 bar.  If not, it's kinda pointless imo.

--- End quote ---
The car was spot on after the RFD and inlet clean...started roughish the first time obv but straight after that it started and ran fine. The miss was still there at idle but that was there pre RFD. I ran the car for 2 days without modifying any software for the RFD and it started and ran MUCH better than it did previously....combination of valve clean, injector clean RFD? made the car much much better either way. Didn't even get rough idle tbh. Only had two fault codes both caused by the RFD but no EML. I can guarantee that quite a lot of MK5 cold starts and crap initial running when cold is partially down to gunked up inlet valves since doing mine the car starts and runs perfect when cold.. it's night and day.

Now I went to R-Tech couple days ago for a custom map. Very very happy with the results. I will put this up on my own members page however with dyno results etc. The miss on cylinder 2 is still there at idle. I have had no misses through driving or any under load scenario. You wldn't have known it had a miss if you weren't monitoring on VCDS etc.

Car runs completely different on R-Tech map...even on start up and idle...again it's night and day but will post all this on my members ride thread.

As for the injector clean...tbh mate I didn't dive that deep into what equipment they use or to what spec/method...if they have a service that can test and partially clean them plus give me peace of mind they are in good order I was happy with that. I'm pretty sure if the injector was fckd then they wld have picked that up and that is what they were mainly sent down for..inlet clean and injector recon made sense as it was a bit of an investigation at the same time. I have no idea what method they use but I do have the printout of the results with the test equipment used and test results with flow rates and spray patterns etc...il stick it up later for people to nosey or compare and see what you think

pudding:
Mine's alway been a good starter, before and after inlet clean. No change. In all honesty, I noticed absolutely nothing after the valve clean  :grin:  Maybe mine wasn't as gunked up as other peoples, not sure.

Sounds like yours needs some deeper troubleshooting.  The compression test came back good, the injectors are done, the inlets are cleaned up.....and it's still misfiring!  Have you checked plug 2 recently to see if it's the same colour as the other 3?

csrigo:

--- Quote from: Pudding on November 23, 2018, 11:18:27 am ---Mine's alway been a good starter, before and after inlet clean. No change. In all honesty, I noticed absolutely nothing after the valve clean  :grin:  Maybe mine wasn't as gunked up as other peoples, not sure.

Sounds like yours needs some deeper troubleshooting.  The compression test came back good, the injectors are done, the inlets are cleaned up.....and it's still misfiring!  Have you checked plug 2 recently to see if it's the same colour as the other 3?

--- End quote ---

Yeah mate it's pretty weird I might just change all packs and plugs again see what happens. What mileage did you do your valve clean and was it summer or winter? If it was as gunked up as mine you would prob have remembered as it was bad. I did do the RFD at the same time tho so hard to pin point what made the difference. Yeah my car was always good in the summer but in the winter in Scotland when very cold you did notice a rougher start(always starts just a slightly rough/restricted initial running) you must be extremely lucky to have never had any roughish starts in a mk5. Now tho it's night and day and it's getting cold up here...zero roughness at all now and throttle is spot on but the R-Tech map has it running different...in a good way.

Cant load any pics at the moment photobucket is crap and won't work...anybody got any suggestions for another pic sharing app?

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