Hesitation under light acceleration

SHOme · March 14, 2016, 10:18:15 AM

Hello all. I have been a member for a while but I have not posted anything yet. I have used this forum as an excellent resource for my Hotrod. I currently have only an LMS 2,3,4 and 4+ tunes, gapped plugs and nothing else. I am running the 4 presently. I have a 2010 SHO built in September of 2009. I have had it since May of 2014. It has 109k on it now. I am having what feels like a miss under light acceleration from 1000 to about 2000 RPM. I can see the tack jumping about 250 RMP up and down. If I drop the hammer or try to accelerate more rapidly she goes fine. I replaced the plugs and they looked fine. It did not fix the problem. I had a top engine cleaning done and ran a can of BG cleaner though the tank. I then ran at least 6 tanks with LUCAS fuel injector cleaner. This was all done a week and a half ago. I had a trip to Florida, 3038 miles running cleaners the whole time. I have no codes and still the issue is unchanged. I checked in the intercooler with my dipstick and there is about 1/4 inch of oil in there. I jacked the driver side to check this. I could not suck it out because it was not enough. I don't know where to go from here. So before I go to the stealership I was hoping for some help. I know nothing about data logging or even how to read the results if i had the ability to do it. Does anyone think this will help? BTW switched back to stock tune and the problem is still there just not as pronounced.

Brucelinc · March 14, 2016, 10:25:12 AM

I don't know anything about data logging either but I am sure someone will chime in. Based on what you are describing, I would be suspicious of a coil going bad. Obviously, you do not want to just start throwing parts at it, though.

SHOme · March 14, 2016, 10:33:55 AM

Does anyone know what resistance the coils should be? I can check them. I have not read about coils being an issue but at 109k anything is possible. I would also think a coil would throw a code.

Brucelinc · March 14, 2016, 10:42:59 AM

I haven't heard of many coil issues with the ecoboost, either. I based my comment on my experience with my last car - a Lincoln LS. When coils would begin to fail, the symptom was exactly what you describe. They would NEVER throw a code until they completely failed. Again, I am just throwing out one idea and it could certainly be wrong.

ZSHO · March 14, 2016, 10:58:04 AM

Welcome aboard the EBPF SHOme,Bruce is correct in fact that anything is possible considering the mileage on there,would also check to see if the COP have any rips or tears in them and would definitely change them for reassurance purposes and can be found fairly cheap,also did you notice any oil inside the spark plug wells? any leaks around the rear valve cover?might want to consider a new pcv valve,heres the link and thanks for joining. Z http://www.rockauto.com/en/moreinfo.php?pk=3422364&cc=1445050&jsn=410 http://www.rockauto.com/en/catalog/ford,2010,taurus,3.5l+v6+turbocharged,1445050,ignition?a=Referer+www.searchlock.com+URL+%2F

Scott4957 · March 14, 2016, 11:01:49 AM

Quote from: SHOme on March 14, 2016, 10:33:55 AM
Does anyone know what resistance the coils should be? I can check them. I have not read about coils being an issue but at 109k anything is possible. I would also think a coil would throw a code.

I don't know what they should be, but either way you will check them all. If one is way off the others then I would say you have your answer. I think it would be a good place to start.

SHOdded · March 14, 2016, 11:04:34 AM

Welcome, SHOme, glad to have you & your '10 SHO here! Can't datalog with the LME tuner, you would have to datalog independently with, for example, Forscan or Torque Pro connected via Bluetooth or WiFi to an OBD II data reader.

Anyhoo, two additional things to check:
1) the knock sensor wiring for chafing - problem is more prevalent on '10-'12 SHOs, and
2) any loose/cracked piping under the engine cover - can make it seem like an ignition/fuel problem

If all these items look OK, then you may have the beginnings of a fuel injector issue. These have been known to leak/fail.

Vortech347 · March 14, 2016, 11:09:31 AM

Mine does this too sometimes going up a hill or using just enough throttle to do a 6th gear pass at around 60. Mine did it stock and tuned. My friend's stock Fusion EB does it as well.

SHOme · March 14, 2016, 11:11:31 AM

I inspected under the hood and did not see any leaks, all the coil boost looked good and there was no oil in the pug wells. I will check the wire chaffing I did not know about that issue. How much money are we talking for the equipment to data log and do you think it would identify the problem?

SHOdded · March 14, 2016, 11:15:46 AM

If you have a smartphone or tablet (Android or iOS), the cost of entry is the reader, and the software. Depending on the reader you choose, your total in would be $30 - $85 at current pricing.

For example -
BAFX Products 34t5 Bluetooth: http://smile.amazon.com/BAFX-Products-34t5-Bluetooth-Android/dp/B005NLQAHS/ - Android only
OBDLINK MX Bluetooth: http://smile.amazon.com/gp/product/B006NZTZLQ - Android only

Torque Pro: https://play.google.com/store/apps/details?id=org.prowl.torque
Forscan: https://play.google.com/store/apps/details?id=com.astech.forscanlite

ZSHO · March 14, 2016, 11:24:13 AM

I would also check the condition of the wastegate hoses,they have a tendency to pop off sometimes because there is no clamp supplied by Ford,,its located right above the front bov,pics below. Z

SHOme · March 14, 2016, 11:50:25 AM

Hoses look good. thanks.

SHOdded · March 14, 2016, 12:41:55 PM

It's hard to measure resistance correctly on COP ignition systems (need specialized tools to read waveforms), so can't really help you there. If there are no codes set, you don't even have a pointer to a particular cylinder being the problem.

BTW, what are the newest plugs gapped to, do you know? Should be 0.030. I take it you are still running the stock MAP sensors? Might be due for cleaning (use MAF sensor cleaner) and/or replacement.

Datalogging can be very tedious, but when you catch an event in progress, the EUREKA moment is well worth it

SHOme · March 14, 2016, 01:24:54 PM

I did gap at .030 with an actual feeler gauge. It is stock sensor. I do have a three bar but no tune for it. So I haven't put it in yet. I contemplating meth and want to do it all at the same time. I am trying to get my local dealer to data log for me. I can make it happen anytime. It's not one of those phantom issues that never happens when it's being diagnosed.

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Brucelinc · March 14, 2016, 03:12:23 PM

If you are involving your dealer, I think they can load test the coils and determine if one or more are failing. My dealer did that when I had the issue with my old Lincoln. Coils did not have to be removed for that test.