Hi Nick, cheers for the advice there, I'll give that a go at the weekend whilst I'm doing a few other little jobs :o) I did have to have the complete inlet manifold replaced as there was a hole in it causing a massive vacuum leak, but I'm not sure if the throttle body was also replaced at the same time 'in one lump' so to speak. I did have a new throttle body about 3 years ago, but its only recently (since the 170bhp upgrade) that the backfiring and flames have started). Richard thought it might be down to the poppet valves too. I'll let you know how it goes. Cheers, Claire #2292 DOC170 --- In doc-uk@xxxxxxxxxxxxxxx, Nick Tomlinson <nickandkathryntomlinson@...> wrote: > > i bet you any money you have had the throttle plates swapped from a volvo one and these do not have the poppet valves fitted so on the over-run the engine overfuels. > > try seating the brass screws, then unscrewing the 2 nearest the W pipe 12 flats (2 turns). Then, run the engine to normal temperature then unscrew the back one (nearest the metering flap) open until the engine revs just increase then back it off 1.5 flats. This should give more air bypass round the throttle plate instead of just through the idle speed motor. Give it a go, this is how I set the engines so that the idle oscillation is minimised. > > Glad your car didn't go up in flames! > > NickT. ------------------------ Yahoo! Groups Sponsor --------------------~--> Home is just a click away. Make Yahoo! your home page now. http://us.click.yahoo.com/DHchtC/3FxNAA/yQLSAA/HliolB/TM --------------------------------------------------------------------~-> DOC UK Website: www.deloreans.co.uk Unsubscribe: doc-uk-unsubscribe@xxxxxxxxxxxxxxx ** Unless otherwise stated, all messages posted to the group are assumed public and may be printed in the club magazine ** Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/doc-uk/ <*> To unsubscribe from this group, send an email to: doc-uk-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/