hopalong_neil Posted February 27, 2016 Share Posted February 27, 2016 Ive just fitted a TD uprated fuel pump and noticed at idle its running significantly richer. Before change on warm engine wideband was showing around 14.2 but now its 12.5.Anyone had anything similar? Quote Link to post Share on other sites
5T4R7ET N/A Posted February 27, 2016 Share Posted February 27, 2016 Has the car been mapped before fitting new pump? Quote Link to post Share on other sites
hopalong_neil Posted February 27, 2016 Author Share Posted February 27, 2016 No, was running a JAM ecu which was fuelling fine with a td04 @ 0.9 bar Quote Link to post Share on other sites
5e colin Posted February 27, 2016 Share Posted February 27, 2016 feul pump makes feck al diference 125l 255l or 355l afr stays the same !!! its controled by the feul pressure regulator make sure engine is up to temps if you have the pfc fitted yet ??? then its a setup isseu turn down the nob inside !! Quote Link to post Share on other sites
hopalong_neil Posted February 27, 2016 Author Share Posted February 27, 2016 No Colin, pfc not fitted yet, still running on JAM ecu.Only thing i have changed if the fuel pump. Quote Link to post Share on other sites
Stu Posted February 28, 2016 Share Posted February 28, 2016 Are you checking the afr when its up to temp? Unless you've changed the base fuel pressure it should be exactly the same. Quote Link to post Share on other sites
hopalong_neil Posted February 28, 2016 Author Share Posted February 28, 2016 Yeah engine is fully warm, cold starts at 10 then only climbs to 12.5 max Quote Link to post Share on other sites
Stu Posted February 28, 2016 Share Posted February 28, 2016 Thats interesting. Do you have a stock fpr on it? Quote Link to post Share on other sites
H_D Posted February 28, 2016 Share Posted February 28, 2016 Hows it fuelling on boost? Hows it fuelling on boost? Quote Link to post Share on other sites
TrisK Posted February 28, 2016 Share Posted February 28, 2016 If the pump was seriously knackered before and wasn't making enough pressure then pump will affect you afrsProbably worth doing the whole unplug and relearn procedure on the ecu Quote Link to post Share on other sites
5e colin Posted February 28, 2016 Share Posted February 28, 2016 did you calibrate your wideband sensor ? Quote Link to post Share on other sites
hopalong_neil Posted February 28, 2016 Author Share Posted February 28, 2016 Yes, stock fprNot driven it yetHave AEM wideband, no need to calibrate as far as i am aware.Bit of a long shot but would the tank vent make any difference? Have noticed the last few times I've filled up a lot of air either escapes or enters.Ran it for about an hour yesterday stationary after changing pump and this morning same thing... Quote Link to post Share on other sites
5e colin Posted February 28, 2016 Share Posted February 28, 2016 wel if you think its the vent then start her with petrol cap off and see if it change i dont think it make a diference neil Quote Link to post Share on other sites
hopalong_neil Posted February 28, 2016 Author Share Posted February 28, 2016 Ok, no difference there.Def running rich, checked plugs and they were all sooted up.Might try changing o2 to see of that helps but would be a coincidence if it died at same time i changed the pump.What controls cold start on the gt, is it a sensor? Quote Link to post Share on other sites
5e colin Posted February 28, 2016 Share Posted February 28, 2016 ecu temp sensor and 02 sensor are the main 1s on stationary / cold start could settle down to tho after some blasting seen that before with engines that havent driven for long periods Quote Link to post Share on other sites
Duduglanza Posted February 29, 2016 Share Posted February 29, 2016 whats the afrs on boost? have they gone up too? what pressue is the reg setup? Quote Link to post Share on other sites
hopalong_neil Posted February 29, 2016 Author Share Posted February 29, 2016 Not been able to get the car out to drive, cold start afr drops off the scale and car barely runs.Stock fpr fitted Quote Link to post Share on other sites
gorganl2000 Posted February 29, 2016 Share Posted February 29, 2016 i suspect an ecu reset and some driving will get you back to normal afrs Quote Link to post Share on other sites
H_D Posted February 29, 2016 Share Posted February 29, 2016 Car will run rich after an ecu reset and usually trims itself after 50-100 miles on pnp ecus Quote Link to post Share on other sites
Ollieh17 Posted February 29, 2016 Share Posted February 29, 2016 I had the same issue after fitting a 255lph Quote Link to post Share on other sites
hopalong_neil Posted February 29, 2016 Author Share Posted February 29, 2016 I had the same issue after fitting a 255lphDid it improve? Quote Link to post Share on other sites
hopalong_neil Posted February 29, 2016 Author Share Posted February 29, 2016 Car will run rich after an ecu reset and usually trims itself after 50-100 miles on pnp ecusOk, if i can get it running and warmed up enough to drive I'll give it a go Quote Link to post Share on other sites
Ollieh17 Posted February 29, 2016 Share Posted February 29, 2016 Nope Quote Link to post Share on other sites
hopalong_neil Posted March 5, 2016 Author Share Posted March 5, 2016 Ok, quick update after a few hours work today. Have fitted a sard fpr and adjusted it to 2.3 bar and its still overfuelling loads so it seems that its definitely something demanding more fuel be it a sensor or ecu.So next thing i think is change out o2 sensor as this would seem the most likely culprit.Also to check sensor wiring am i right in thinking that i can test continuity between ecu pin and sensor wire plug? Anyone know what pin it is? Quote Link to post Share on other sites
adzy Posted March 5, 2016 Share Posted March 5, 2016 Have the same issue with my 255 pump fitted, started running very rich after, also changed the O2 sensor with didn't change anything.This was also before I fitted the p+p ecu Quote Link to post Share on other sites
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