max Posted May 13, 2015 Report Share Posted May 13, 2015 hello bit of a strange problem i'm having. the last few weeks i've been trying to up the boost on my car and mapping the fuel as i up the boost duty the problem ive been having is as soon as i get to 40 percent duty and around 3500/4000 rpm i get a hesitation if i keep my foot down it pulls through the hesitation. it seems like fuel but the afrs are aren't going lean there pretty much staying were they should be i have changed the fuel filter and fitted another brand new bosch 044 put the boost duty up to 80 percent took it for a quick test and the hesitation had gone. but you guessed it as soon as i took it out to map it the hesitation is back at 40 percent duty. when its doing this the fuel pump is louder than normal and it seems to happen when under bonnet temps are up. i just tried to get a log of it but it stopped doing it when i tried but on the graph when it does it you get a nice curve then a squiggle in the line when it happens its a very strange problem i need to get to the bottom of it Quote Link to comment Share on other sites More sharing options...
max Posted May 13, 2015 Author Report Share Posted May 13, 2015 also the fuel pressure sensor has decided to stop working just as i need it the most a new one is on order Quote Link to comment Share on other sites More sharing options...
max Posted May 13, 2015 Author Report Share Posted May 13, 2015 forgot to mention when it happens i also get hesitation on light load Quote Link to comment Share on other sites More sharing options...
Dave Kriedeman Posted May 14, 2015 Report Share Posted May 14, 2015 Hi Max, a PC data log of all parameters would be a handy starting point. Log rate at 40 HZ please. Regards Dave. Quote Link to comment Share on other sites More sharing options...
max Posted May 14, 2015 Author Report Share Posted May 14, 2015 Yes thats what im going to do when the weather picks up hopefully by then the fuel pressure sensor will have turned up Quote Link to comment Share on other sites More sharing options...
max Posted May 14, 2015 Author Report Share Posted May 14, 2015 Any parameters in paticular i should log Quote Link to comment Share on other sites More sharing options...
Simon Posted May 14, 2015 Report Share Posted May 14, 2015 Hi Max As its a PC log memory is not an issue so log all parameters. That way nothing is missed. Quote Link to comment Share on other sites More sharing options...
max Posted May 15, 2015 Author Report Share Posted May 15, 2015 think i've found the problem but would be helpfull if someone could confirm my findings would the tps cause this issue on the log file the tps percentage is dropping off even though the accelerator is all the way down it happens around 3500rpm i have another log file when its not hesitating and the tps is at 100 percent. Quote Link to comment Share on other sites More sharing options...
max Posted May 15, 2015 Author Report Share Posted May 15, 2015 its not letting me upload the log file for some reason Quote Link to comment Share on other sites More sharing options...
max Posted May 15, 2015 Author Report Share Posted May 15, 2015 maybe this will work Log 15-05-15 9;39;07 pm.zip Quote Link to comment Share on other sites More sharing options...
max Posted May 20, 2015 Author Report Share Posted May 20, 2015 fitted a new t.p.s but still getting the hesitation but still only when you up the boost here is a new log showing the problem Quote Link to comment Share on other sites More sharing options...
max Posted May 25, 2015 Author Report Share Posted May 25, 2015 replaced the denso coils and seems to be ok now the old ones must have been breaking down under load Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.