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Car Forum / Fiat Cars / September 2006Punto 1.2 Active Sport uneven idle
My girlfirends Punto started having an erratic idle. I have changed the spark plugs and air filter. Since then, the engine now holds revs after about 7 miles of driving. It either idles hunting between 800-1200 revs or holds at 1500. If it does come down to 800 it then stalls. The revs are held at 3000 when you come off throttle. I'v checked the throttle cable, lubricated it and its not sticking. I've also cleaned the stepper motor out with WD40 hoping that would cure it. The engine when under load is fine but when you are feathering the throttle it runs lumpily and the car is jumpy. I took the car to Fiat, they checked the ECU for fault codes and there was nothing stored. They flashed ECU with an update of software and it didn't do anything to help out. Please would someone point me in the right direction as to how this is caused. Thank you Totally remove the throttle cable so the throttle can be freely rotated by hand. Gently move end stop to end stop (especially at the nearly closed end) feeling for any drag, snatching etc. The other possible cause is that the ECU which is self adaptive has got itself all confused and needs retraining. The sequence (from memory) is as follows: 1) Disconnect battery for 30 minutes 2) Reconnect bat. 3) Start car and allow to idle till fan cuts in 3 times 4) Rev car at a steady 3000 rpm for five minutes 5) Release throttle and allow engine to idle for 1 or 2 minutes 6) Switch off Please report back how you get on. Nick ///// > My girlfirends Punto started having an erratic idle. I have changed the > spark [quoted text clipped - 16 lines] > is > caused. Thank you > The other possible cause is that the ECU which is self adaptive has got > itself all confused and needs retraining. [quoted text clipped - 7 lines] > 5) Release throttle and allow engine to idle for 1 or 2 minutes > 6) Switch off Excuse me for jumping in a hijacking this ... Does this procedure apply to the MK1 Sporting, too? Our second Sporting is nothing like as quick as our first one. I have disconnected the battery for 15 minutes and reconnected, but there's still an awful flat spot in all gears and it _feels_ like the flat spot ends when just lifting off full throttle, but if the throttle is only opened that far (to just near open throttle) it's still very poor. I had wondered if the ECU had got confused and was pretty much only allowing a very narrow set of fuelling instructions. Paul > in article 45158687$0$3617$ed2e19e4@ptn-nntp-reader04.plus.net, Nick > ///// [quoted text clipped - 27 lines] > > Paul If your Sporting is a 2002 - 2003 model I'm afraid you might have to live with that. Our MK2 (2003) has the same annoying feature, while our 2000 model has not. It seems the E.O.B.D-system (Electronic On Board Diagnostics) is responsible for this kind of behaviour. Also the "improved" environment protection unit has something to do with it. At least that is what someone once told me. Maybe there is a ECU-update for your car, I don't know for sure. But maybe Nick has a different vision on this subject. If so, I would like to hear as well. Ciao, E-Cie. >> in article 45158687$0$3617$ed2e19e4@ptn-nntp-reader04.plus.net, Nick >> ///// [quoted text clipped - 25 lines] >> had got confused and was pretty much only allowing a very narrow set of >> fuelling instructions. > If your Sporting is a 2002 - 2003 model I'm afraid you might have to live > with that. Our MK2 (2003) has the same annoying feature, while our 2000 [quoted text clipped - 5 lines] > like to hear as well. > Ciao, E-Cie. Both the Sportings are MY 1999. AFAIK, resetting the ECU was as simple as disconnecting it for 15 minutes. The ECU would then "learn" as you drove it, but this procedure does make sense. Paul Well 1st reports look promising for our Punto friend. In terms of environment protection and ECU settings I totally agree. My 02, Euro 4, Stilo Arbarth suffers from pinking/detonation. Fiat agree yet refuse to do anything about it. To reduce detonation there are two methods. 1) reduce ignition advance and 2) increase fuel delivery. Both of these increase emissions. My Stilo has two "knock" sensors, both work and both signal detonation. Both retard/modify fuel quantity but NOT enough. Fiat have basically ring fenced the ECU map. I have my findings and concerns loggted in writing with Fiat and there will be hell to pay if and when I suffer engine damage. I expect 200,000 miles out of my Stilo engine ! :-) I have considered having the ECU remaped but to do this would possibly negate any claims against Fiat so have not gone down this route. Nick ///// >> in article 45158687$0$3617$ed2e19e4@ptn-nntp-reader04.plus.net, Nick >> ///// [quoted text clipped - 39 lines] > this subject. If so, I would like to hear as well. > Ciao, E-Cie. "Nick /////" <nicknewsX@Xnick-bailey.co.uk> schreef in bericht news:4516f522$0$3578$ed2e19e4@ptn-nntp-reader04.plus.net... > Well 1st reports look promising for our Punto friend. > [quoted text clipped - 60 lines] >> this subject. If so, I would like to hear as well. >> Ciao, E-Cie. Thanks Nick. Hope your Stilo will last that long, or more! Just a week ago, at my Fiat-dealer, I saw a Stilo with a blown engine; looked like the1st piston totally smashed it. I don't know the mileage, neither the cause, but I'm willing to ask if you are interested. I don't want to upset you, though...;-) Ciao, E-Cie Can't promise anything but it may help. I think all Bosch / Hitachi / Marelli are self adaptive and can become unsettled. Running the procedure will not do any harm. If your sporting is single point injection then there is another visible fuel check you can make. Remove the air filter so you can see directly into the throttle body. Start the car and look into the top of the throttle body. You should see mists of fuel being injected into the body. Now operate the trottle and the fuel should flow more and still be well misted / spray and not jet like. Difficult to judge but play a little reving and watching. You can also us a ver small dental mirror to inspect the injector to see if you can see any fuel resin deposits on/around the injector head. If you are in any doubt the run some injector cleaner through the system. Nick ///// > in article 45158687$0$3617$ed2e19e4@ptn-nntp-reader04.plus.net, Nick > ///// [quoted text clipped - 27 lines] > > Paul I have carried out what you have advised me to do and after taking the car for a run down the dual carriage way, so far, all looks well. Thank you for your help, I will get back to you if this doesn't cure the problems and hopefully you'll be able to help me furhter. Again a big thankyou >Totally remove the throttle cable so the throttle can be freely rotated by >hand. [quoted text clipped - 23 lines] >> is >> caused. Thank you Well this sounds good and I'm pleased for you. Hopefully the solution will last for a good while. I do hope it lasts. These sort of problems are so difficult to diagnose, let alone fix, that any experience of advice from any quarter is well worth noting. Fingers crossed. Nick ///// >I have carried out what you have advised me to do and after taking the car > for a run down the dual carriage way, so far, all looks well. Thank you [quoted text clipped - 29 lines] >>> is >>> caused. Thank you |
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