Fabiano Posted September 30, 2019 Share Posted September 30, 2019 Hello all! I have a 2010 Ford Fusion SEL 3.0 AWD and I am just over three months with a slow start issue that is driving me crazy. The car was serviced in June/19 and had all of its fuel injectors replaced. It was experiencing both idle and normal driving ignition failures because one of the injectors was “dripping” fuel. The other injectors were also experiencing a small leak in the middle of the part. The important thing is that all misfires were resolved with this maintenance. However, shortly after that, the slow start issue began. The first start of the day occurs without any problem. Usually the car stays stationary for at least 12 hours overnight: https://youtu.be/FpNBqUAWUNg Let's say the car runs for a few kilometers and engine reaches normal operating temperature: if it is stopped and started immediately afterwards, it also starts without problems. But if it stays stationary for at least 40 minutes, the next start will be a slow one: https://youtu.be/Sa7Vjx0Xkng (<= here the car was driven for four kilometers and then stood stationary for an hour and fifty minutes) This problem can be repeated several times a day, as long as the car remains stationary for at least 40 minutes. Ambient temperature does not influence the result, the problem has already occurred under an ambient temperature range of 15 to 35 ° C (59 to 95 ° F): https://youtu.be/6F05L2Iw_Pc (<= here the car was driven for twenty-two kilometers and then stood stationary for five and a half hours) PCM has only one DTC: P0430 (Catalyst System Efficiency Below Threshold - Bank 2). I believe this error could be a consequence and not the cause of the issue… Last month the car battery died, it had less than two years of use. Its brand is a recognizably good quality brand here in Brazil, so I believe it died from excessive wear during the many slow engine starts. So, right now the car is in a second shop because the first one (which replaced the fuel injectors) could not diagnose the problem. The guys of current shop said they measured the pressure of the fuel pump and that it is reaching 4 bar even during the slow start. So we are running out of ideas… I apologize for the Portuguese audio in the videos, the important is how the engine sounds. Any help or tip would be appreciated! Thanks in advance. 0 Quote Link to comment Share on other sites More sharing options...
bangster Posted September 30, 2019 Share Posted September 30, 2019 So the starter isn't slow (like a low battery), but it takes an extended amount of time to crank for it to start and run, right? I think I can hear a pretty long crank that seems fast enough, then it starts, but it is pretty noisy engine once it starts. What happens if you let the fuel system prime a couple of times (put the key to RUN but don't try to start it, turn it OFF then back to RUN) then try to start it? Even though it has good fuel pressure, I wonder if it is bleeding off that pressure, and it won't fire until fuel pressure is built back up. 0 Quote Link to comment Share on other sites More sharing options...
Fabiano Posted September 30, 2019 Author Share Posted September 30, 2019 5 minutes ago, bangster said: What happens if you let the fuel system prime a couple of times (put the key to RUN but don't try to start it, turn it OFF then back to RUN) then try to start it? Even though it has good fuel pressure, I wonder if it is bleeding off that pressure, and it won't fire until fuel pressure is built back up. Thanks for your reply! Yes, I tried that a couple of times, but it makes no difference, the slow start occurs anyway... Except, of course, in the first start of the day. 0 Quote Link to comment Share on other sites More sharing options...
Fabiano Posted September 30, 2019 Author Share Posted September 30, 2019 (edited) 1 hour ago, bangster said: Even though it has good fuel pressure, I wonder if it is bleeding off that pressure, and it won't fire until fuel pressure is built back up. How can this be verified? Besides measuring fuel pressure, is there something else about fuel pump that need to be checked? Edited September 30, 2019 by Fabiano Make question more clear 0 Quote Link to comment Share on other sites More sharing options...
Brcobrem Posted November 4, 2019 Share Posted November 4, 2019 Hi Fabiano, Sounds like you still have a leaky injector. I'm not an expert on this, but can you smell gas after it sits a bit, maybe 30 mins? I'm new to Fusions, but on some other Fords, for this 2nd/3rd/etc warm start, you can "pause" the fuel injectors (maybe the pump?) by turning key on, depress the throttle fully (just fully down, not through the floor please), then move the key to turn the engine over. Be careful to get off the throttle quickly after it fires or you'll give the engine a really good over-rev. There's a technique to it. If it starts right up with no coughing or misfiring, probably a leaky injector. Why does that "procedure" work? As I understand it, this prevents you from dumping even more gas into an already flooded cylinder. Regards . . . 0 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.
Note: Your post will require moderator approval before it will be visible.