Vevapower Waiting for the 1st N/A 12! Donating Members 2,533 Member For: 16y 2m 12d Gender: Male Location: Sydney Posted 03/01/11 04:22 AM Share Posted 03/01/11 04:22 AM Hi guys, notice just recently that my BF has a slight flat spot just off idle or if you're just cruising and lightly touch the pedal you can feel it too, but you feel a sort of hesitation with a light power coming on off. But get her up over 1500 or slightly on power and sweet as strong as ever no dramas at all! Actually when you start from cold and tap the accelerator slightly it has the tendency to stall occasionally, but the problem seems to be less noticeable as the car warms up and you've been driving for a while. The Cruise control will now not work and I feel that this is all connected somehow. Tuner thinks it might be throttle body related!!! I've searched high and low on all forums but not been able to find anything close to my query! Anyways I hope some guru out there can give me some advice or fix. Link to comment Share on other sites More sharing options...
Rosie Member 361 Member For: 17y 15d Posted 03/01/11 10:59 PM Share Posted 03/01/11 10:59 PM I used to have something similar and finally found the Fuel pressure at 1500-3000rpm was set below 50psi.- It was in fact 29psi!Base Fuel pressure should be 50psi!It would be worth your Tuner having a look at this Data! Link to comment Share on other sites More sharing options...
Vevapower Waiting for the 1st N/A 12! Donating Members 2,533 Member For: 16y 2m 12d Gender: Male Location: Sydney Posted 03/01/11 11:32 PM Author Share Posted 03/01/11 11:32 PM Hmmm yeah sounds plausable and a possible reason for the flat spot!I'll have the Tuner look at this, this week and let you know how I get on!I need to sort this out sooner than later as the car is now for sale! Link to comment Share on other sites More sharing options...
Rosie Member 361 Member For: 17y 15d Posted 03/01/11 11:34 PM Share Posted 03/01/11 11:34 PM Good luck! Link to comment Share on other sites More sharing options...
Mr_4.0 Member 1,096 Member For: 13y 3m 4d Posted 03/03/11 07:54 AM Share Posted 03/03/11 07:54 AM my fuel pressure at idle is 420kpa Link to comment Share on other sites More sharing options...
NVT Formerly EGOBFXR6 Donating Members 1,111 Member For: 16y 2m 18d Gender: Male Location: Perth, WA Posted 05/03/11 02:52 PM Share Posted 05/03/11 02:52 PM Hey mate,I had this issue on my car very recently... I'll let you know what I did to fix my car. Should take you about an hour and about $20 to fix. And if it doesn't work, you haven't lost anything and you have a cleaner throttle body I had that flat spot, real rough idle and light throttle resulted in the revs dropping off; Sometimes to a stall... Also had the tendency to want to stall when braking to a stop.Here's what I used and what I did;Some sockets/ring spanners/screwdriversCan of throttle body/carby cleaner and ragFuel treatment designed to clean fuel system and injectors - I used NulonD/C the batteryI removed the air filter and cleaned it along with the air box. Removed the X-over and hot-side/cold-side piping. Blew them out with some compressed air.Removed X-over from throttle body and moved slightly out of the way so it was easier to clean the TBGently opened the TB butterfly and wedged a rag in one half of the opening to hold it in placeSprayed TB cleaner in to half the opening, wiping off any excess, then wiping again after it has soakedSame to the other half of the TBTightened all clamps/hose fittings appropriatelyAir filter/box back and re-connect batteryRestart car - It will turn over a few times and will start and run rough for the first few minutes.Then should be all good Head to the servo, add the fuel additive in case it is an injector/fuel system issue and fill up.If that doesn't fix it, you've tried a cheap an easy fix - And ruling out issues is the next best thing to help you fix it!If that's not it, there is a chance it could also be; (From my research)Fouled injectorsFuel filter clogged and needs replacingInjector/fuel system issues02 sensor issuesFouled plugs, Coil pack failureIf that fails, a bad tune or computer/timing issues.I think you'll find it is the TB issue - It is very common in the BA/BF series.Hope that helps mate Dan Link to comment Share on other sites More sharing options...
Vevapower Waiting for the 1st N/A 12! Donating Members 2,533 Member For: 16y 2m 12d Gender: Male Location: Sydney Posted 05/03/11 10:56 PM Author Share Posted 05/03/11 10:56 PM Hey mate,I had this issue on my car very recently... I'll let you know what I did to fix my car. Should take you about an hour and about $20 to fix. And if it doesn't work, you haven't lost anything and you have a cleaner throttle body I had that flat spot, real rough idle and light throttle resulted in the revs dropping off; Sometimes to a stall... Also had the tendency to want to stall when braking to a stop.Here's what I used and what I did;Some sockets/ring spanners/screwdriversCan of throttle body/carby cleaner and ragFuel treatment designed to clean fuel system and injectors - I used NulonD/C the batteryI removed the air filter and cleaned it along with the air box. Removed the X-over and hot-side/cold-side piping. Blew them out with some compressed air.Removed X-over from throttle body and moved slightly out of the way so it was easier to clean the TBGently opened the TB butterfly and wedged a rag in one half of the opening to hold it in placeSprayed TB cleaner in to half the opening, wiping off any excess, then wiping again after it has soakedSame to the other half of the TBTightened all clamps/hose fittings appropriatelyAir filter/box back and re-connect batteryRestart car - It will turn over a few times and will start and run rough for the first few minutes.Then should be all good Head to the servo, add the fuel additive in case it is an injector/fuel system issue and fill up.If that doesn't fix it, you've tried a cheap an easy fix - And ruling out issues is the next best thing to help you fix it!If that's not it, there is a chance it could also be; (From my research)Fouled injectorsFuel filter clogged and needs replacingInjector/fuel system issues02 sensor issuesFouled plugs, Coil pack failureIf that fails, a bad tune or computer/timing issues.I think you'll find it is the TB issue - It is very common in the BA/BF series.Hope that helps mate DanCheers Dan some great tips there mate! Link to comment Share on other sites More sharing options...
JVK Silver Donating Members 751 Member For: 18y 4m 5d Gender: Male Location: North West Hot Hell,VIC Posted 06/03/11 02:16 AM Share Posted 06/03/11 02:16 AM Good writeup NVT Link to comment Share on other sites More sharing options...
NVT Formerly EGOBFXR6 Donating Members 1,111 Member For: 16y 2m 18d Gender: Male Location: Perth, WA Posted 06/03/11 04:45 AM Share Posted 06/03/11 04:45 AM No worries guys,This problem is so common and usually such an easy fix, but no-one anywhere seems to know about it... Like I said, it's a cheap and simple fix and you don't have to have any mechanical knowledge. $20 and an hour seems good to me If this isn't the case, and your car is still acting up have a look into the other suggestions. Most of them are cheap fixes too. (These are for parts only, but labor shouldn't set you back too much)Fuel filter - $30Plugs - ~$100Ford can test for individual coil failure - About $70 for a failed coilFuel/Injectors - Could be anything... 02 sensors are easy to diagnose by ford/tuner - Not much $$ Computing/Retune - whatever your tuner chargesGood luck mate, let us know how it turns out Dan Link to comment Share on other sites More sharing options...
F1PERFORMANCE Donating Members 104 Member For: 15y 1m 10d Gender: Male Location: VIC Posted 06/03/11 05:03 AM Share Posted 06/03/11 05:03 AM Hi if TB cleaning does not fix I would say you have a lean spot in the tune - you say that its worse when cold also hints to being lean as there is very high fuel demand when cold Link to comment Share on other sites More sharing options...
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