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Model specific boards => Golf mk4 => Topic started by: jamie16v on 05 June 2010, 20:31

Title: sometimes a small backfire
Post by: jamie16v on 05 June 2010, 20:31

sometimes when i decelerate at low speed i get a quick backfire. could this be down to a leaking pcv system, ie letting unmetered air into the TIP?
also what else could be causing it? havent scanned for fault codes and the car seems to run fine apart from only boosting to 17psi peak before dropping.
this only seemed to happen after i fitted the fmic but there are no leaks.

Title: Re: sometimes a small backfire
Post by: G60GTI16V on 05 June 2010, 22:05

sounds like not all fuel is getting burt possibley, and lack of psi could be down to the fmic pipework/setup  :undecided:

Title: Re: sometimes a small backfire
Post by: james2 on 05 June 2010, 23:37

have you got a performance exhaust iv heard a golf gti do it with a big after market exhaust :undecided:

Title: Re: sometimes a small backfire
Post by: jamie16v on 06 June 2010, 11:45

gawd knows... :tongue:

Title: Re: sometimes a small backfire
Post by: linz on 06 June 2010, 12:10

my car will pop now that she has a decat an more power .....

Title: Re: sometimes a small backfire
Post by: richw911 on 06 June 2010, 12:11

Decat or sports cat fitted?

Title: Re: sometimes a small backfire
Post by: jamie16v on 06 June 2010, 12:39

nope, standard exhaust right through atm, standard airbox with panel filter too..
what i have noticed though is a much better mpg since i covered the holes i drilled in the airbox and put the cold air feed back on..