hmmm, Back firing diesel

johnnyb44 · 2nd November 2018, 05:59

Good morning. Last night I dropped some Forte diesel additive into the fuel tank to give the system a clean out before next Tuesday's mot and the ever tightening emissions test. Coming to work this morning though the car embarrassingly back fired twice after my Italian tune up on the deserted roads followed by a cloud of smoke. By the time I got to work the smoke had clear up. No loss of power or warning lights so fingers crossed it's ok. I'm at a loss though to why forte has caused this though. I may top the fuel tank up tonight on the way home just to dilute it a little just in case it's too concentrated :-),
Edit,,,,After reading up on the internet it appears it's impossible for a diesel to "backfire" so I'm at a complete loss to what it was :-)

RoverP480 · 2nd November 2018, 07:24

Perhaps EGR valve problem letting in too much gas to the cylinder, so it would misfire as opposed to backfire.

bl52krz · 3rd November 2018, 21:42

Hi John. I have never used Forte additive. All I have ever used in my diesel is Redex cleaner. My mot has always been passed with a very low figure for emissions. All I do is put the required amount in the tank before going for an mot, and take it for a quick blast in second gear for around half a mile at 4000 rpm, turn round and do the same again. On the way to my mot, around 4 miles, I only use three gears, 1,2,3. Keep the revs up around 3000. .

johnnyb44 · 4th November 2018, 00:12

Hi David and hope your well buddy.
Sorry for the bad spelling or pronunciation ( to much beer and karaoke tonight).
After the car's unceremoniously burp on Friday morning it has performed faultlessly ever since. I'm starting to think I may have put to much forte in the tank to the amount of diesel. There's no visible black smoke I can detect and the car is running better than ever :-) Hopefully Mr Mot man will give it another clean Bill of health on Tuesday for another year. I hardly ever rev my car over 2000 rpm these days and now cover less the 7000 miles a year. I've actually cycled more miles this year than driving ! :-) I'm starting to think my poor old car is getting somewhat clogged up with carbon ,and with the hard drive I gave it in Friday morning with an overdose of forte injector cleaner has blowout the "gills" Anyway time will tell by Tuesday and hopefully it will sail though it's test.
All very best,
Johnny

2nd November 2018, 05:59	#1
johnnyb44 I really should get out more....... Rover 75 Join Date: Sep 2013 Location: north wales Posts: 2,720 Thanks: 1,774 Thanked 902 Times in 507 Posts	hmmm, Back firing diesel Good morning. Last night I dropped some Forte diesel additive into the fuel tank to give the system a clean out before next Tuesday's mot and the ever tightening emissions test. Coming to work this morning though the car embarrassingly back fired twice after my Italian tune up on the deserted roads followed by a cloud of smoke. By the time I got to work the smoke had clear up. No loss of power or warning lights so fingers crossed it's ok. I'm at a loss though to why forte has caused this though. I may top the fuel tank up tonight on the way home just to dilute it a little just in case it's too concentrated :-), Edit,,,,After reading up on the internet it appears it's impossible for a diesel to "backfire" so I'm at a complete loss to what it was :-) __________________ Replaced pcv filter, springs, plenum spy hole mod,Bonnet cable divider mod. Wax oiled.Air con recharged. Auto box oil changed , Jules plenum guard fitted .Smoked wind deflectors fitted.S/S Compensator.Club Grill Badge kindly donated by Andyg2011.. Last edited by johnnyb44; 2nd November 2018 at 06:39..

3rd November 2018, 21:42	#3
bl52krz This is my second home Rover 75 cdt club + Rover 2.5 KV6 Conni SE Join Date: May 2008 Location: Birmingham Posts: 11,424 Thanks: 6,587 Thanked 2,262 Times in 1,729 Posts	Hi John. I have never used Forte additive. All I have ever used in my diesel is Redex cleaner. My mot has always been passed with a very low figure for emissions. All I do is put the required amount in the tank before going for an mot, and take it for a quick blast in second gear for around half a mile at 4000 rpm, turn round and do the same again. On the way to my mot, around 4 miles, I only use three gears, 1,2,3. Keep the revs up around 3000. . __________________ Great Barr, Birmingham.

4th November 2018, 00:12	#4
johnnyb44 I really should get out more....... Rover 75 Join Date: Sep 2013 Location: north wales Posts: 2,720 Thanks: 1,774 Thanked 902 Times in 507 Posts	Hi David and hope your well buddy. Sorry for the bad spelling or pronunciation ( to much beer and karaoke tonight). After the car's unceremoniously burp on Friday morning it has performed faultlessly ever since. I'm starting to think I may have put to much forte in the tank to the amount of diesel. There's no visible black smoke I can detect and the car is running better than ever :-) Hopefully Mr Mot man will give it another clean Bill of health on Tuesday for another year. I hardly ever rev my car over 2000 rpm these days and now cover less the 7000 miles a year. I've actually cycled more miles this year than driving ! :-) I'm starting to think my poor old car is getting somewhat clogged up with carbon ,and with the hard drive I gave it in Friday morning with an overdose of forte injector cleaner has blowout the "gills" Anyway time will tell by Tuesday and hopefully it will sail though it's test. All very best, Johnny __________________ Replaced pcv filter, springs, plenum spy hole mod,Bonnet cable divider mod. Wax oiled.Air con recharged. Auto box oil changed , Jules plenum guard fitted .Smoked wind deflectors fitted.S/S Compensator.Club Grill Badge kindly donated by Andyg2011..

2nd November 2018, 07:24	#2
RoverP480 Gets stuck in None at the moment Join Date: Jan 2018 Location: Hereford Posts: 501 Thanks: 1 Thanked 165 Times in 146 Posts	Perhaps EGR valve problem letting in too much gas to the cylinder, so it would misfire as opposed to backfire.