Thermostat And Engine Mounts Produce Chugging And Smoke - Diagnostic Consultation On An Audi A4 1.9 TDI (2007 - 164,260 Miles) - F5 Engine Carbon & DPF Clean

Thermostat and Engine Mounts produce chugging and smoke – Diagnostic Consultation on an Audi A4 1.9 TDI (2007 – 164,260 miles)

Adrian @ F5ECC

⚠️ Vehicle not running right? Black smoke, noisy, chugging and overall poor performance?

Here we have an Audi A4 1.9 TDI (2007 – 164,260 miles) booked in for diagnostic consultation and potential Engine Carbon Clean.

ℹ️ The owner booked it in as it was ‘chugging’ when coming off the throttle, smoking black on acceleration and generally not running at its best. Having been looked at elsewhere previously and no codes being found we were then called to take a look and try to work out what was occurring.

Initial inspection found little of note in the engine bay and there were no codes present. Dashboard temperature appeared OK at idle. There was a small amount of jelly wobble at idle up to 1,200rpm which suggested engine mounts were a little worn.

Chugging when coming off the throttle can sometimes be down to insufficient flow through an EGR, but having had a new EGR not that long ago it would be unlikely to be due to the EGR itself (perhaps pipework or inlet manifold).

The owner took us for a quick spin whilst we rode shotgun working the diagnostics.

The EGR flows (desired vs actual) looked good and EGR movement was fine so that eliminated the EGR as the issue. Whilst monitoring the live data we saw the coolant temperature had dropped significantly whilst driving. The cold air coming in over the radiator had cooled everything down and the thermostat wasn’t closing properly – the culprit had been found. We brought the vehicle back and when idling the temperature climbed again (giving a false impression everything was OK).

‍No clean on this one. The original issue is a thermostat not closing properly meaning the engine is running cold when driven. Running cold will produce more emissions, hence the black smoke and over time this will have left a lot of buildup around the system adding to the black smoke issue. A cold running engine will vibrate more and with the partly worn mounts would produce the ‘chugging’ reported by the owner.

Next steps for the owner are
1) replace the thermostat.
2) get us back again to get the engine cleaned up to get it running smooth and quiet again.
3) replace the engine mounts once the clean is done.

Thermostat and Engine Mounts produce chugging and smoke - Diagnostic Consultation on an Audi A4 1.9 TDI (2007 - 164,260 miles)

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Reviews For our Engine Carbon Cleaning Services

2 days ago

Had Adrian carbon cleaning my Audi 2021 A4 tdi .waited to see results over a period of time .car runs smoothly and accelerates with ease The car seems to get to 60 mpg very quickly and just goes up from there so impressed. Adrian Improved the 4 injectors performance but found no 3 slightly out of spec .Adrian went tho the cars diagnosis system very impressive I would highly recommend paul .thanks Adrian

4 days ago

I found this organisation on Google. It had great reviews and the service which I required which was a carbon clean. I found Adrian very helpful and knowledgeable. While he was carrying out the service he explained everything to me and how it works. The car feels better now with it being more responsive and quieter. I would recommend Adrian and his company to friends and family if they required his services. Thanks Adrian hopefully see you again sometime.

5 days ago

This was my first experience with F5 carbon and DPF clean. I was a little desperate as I had been let down twice by a larger franchise company. Mark the technician managed to fit me in at short notice, what a stroke of luck for me I found Mark to be an extremely knowledgeable and professional guy. After running the diagnostic and clearing a few issues he managed to get my DPF working properly and able to do the regeneration process on its own so only charged for the diagnostic even though I had booked for a full DPF cleaning. I cannot recommend F5 enough it's a real pleasure to deal with them. All round excellent service. Thank you guys.

1 month ago

Adrian is a lovely fella, explained the process, carried it out well, clearly done exactly what it needed to do as I blew a load of stuff out the back when I drove it after. Will definitely be coming back in the future.

2 months ago

Great job
Car running a lot better

Highly recommend

2 months ago

Steve arrived to give my Jaguar xfs an engine carbon clean. Presently on 107,000 miles. Explained the process and was obviously very knowledgeable about the process and expected outcomes. And he was a thoroughly nice chap.
The V6 in the xfs is a quiet, smooth, powerful unit and I was not sure of what improvements I would get. Well, I’m impressed. The power delivery is smoother, the engine even quieter and 6 mpg better to boot.
If you want to do one thing to maintain and improve your motor, then this is what you should do.

Mircea Marius Popa

2 months ago

Had the pleasure to meet Adrian this morning who performed a carbon clean on my bmw 525d
Very knowledgeable guy, I was really impressed.
Car drives much better now, highly recommend.

Thanks Adrian

Marius Popa

2 months ago

Adrian went above and beyond at every stage. Couldn’t recommend Adrian as a person and the service highly enough.

william farrell

2 months ago

had my jaguar xf sportsbreak car engine cleaned and omg its like new what a great job the power is back Engine diagnostic was brilliant and the service was so good. I would recommend it to anybody.

Tracey Jane King

2 months ago

Leon came out to my car about a month ago. He was brilliant, he did some diagnostics, asked some questions and then got to work sorting out my problem. He was extremely thorough and I could tell he genuinely cares about providing a first class service. Fantastic!

2 months ago

Iv had the pleasure of having 2 Carbon cleans from both Adrian and Mark. Both lovely gentlemen and you can tell they love what they do. My car failed on emissions and this helped me get the car through the test, and at the time, I REALLY needed a pass because I couldn’t get anywhere. These guys saved me. Not only that, it’s a lot cheaper here compared to other places also. Thank you so much and look forward to seeing you in future endeavours.

3 months ago

Great ppl full of advice and very helpful quick to reply definitely use again thanks guys

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