So I babied the car for the past 3-4 days to see what kind of mpg I can average in the city and still got 16.7 so far average. I feel like this is bad and something might be wrong but the car drives very nicely under normal driving. Well this morning on the way to work I decided to feel some power and got on it from a stop with traction control off. The car accelerated quickly but I noticed in 2nd and 3rd gear there was some hesitation in the upper rpms. Does anyone have any idea what it could be? It only happens for a second, feels kind of like the car “skips” a beat and then it goes back to accelerating hard. I tried it 3-4 times just to see if it will keep happening but it always happens in 2nd and 3rd gear at least once or twice going through the gear. Kind of feels like something is holding it back. It’s just hard to explain. I am running 93 octane gas and the sparkplugs are brand new gapped at .035 which is recommended. Before the sparkplugs I had similar hesitation but less and I was hoping the sparkplugs would be the fix but it seems like this morning its worse. Does anyone have any idea? No CEL lights and the car drives perfect under normal driving. I am begging to worry here and the low mpg’s even while babying the car is worrying me. I called my ford dealer and scheduled an appointment for Friday but I am worried the mechanic will not see anything wrong and I will be at work so I can’t drive with him. (Just dropping off the car in the morning)
Weird Hesitation under WOT
- Thread starter ElvenSho
- Start date
PokerMunkee
New member
The plugs come .30 from factory now. I'd regap them.
PokerMunkee said:
Even the 10-12 models? You think it could be because of the plugs? The old ones in the car were also around the .035 when I took them out and they looked good (healthy). If ford had them at .035 at some point I would assume that they still shouldn't be making the car hesitate or skip?
It will suck having to go back and re-gap but if dealer cant figure out I will have to. Anyone else have ideas? The COP's looked fine also, not sure if one of them could be going bad, but then there would be a CEL right?
TooFast4SHO
New member
They come pregapped at at that now but that was not always so, his model year may be diffrent.
What model and make of vehicle?
My SHO gets 22 with alot of traffic driving but mostly freeway, stop and go in the mornings.
16mpg sounds atrocious and may allude to something significant being off, boost leak or something to that affect. Does it make any audible noises while driving? No check engine light or anything I assume?
What model and make of vehicle?
My SHO gets 22 with alot of traffic driving but mostly freeway, stop and go in the mornings.
16mpg sounds atrocious and may allude to something significant being off, boost leak or something to that affect. Does it make any audible noises while driving? No check engine light or anything I assume?
TooFast4SHO
New member
Maybe low on transmission fluid and that would cause you to run a tad higher rpm for the same dynamic fluid affect to move your vehicle outside of overdrive lockup on the torque converter. And under heavy acceleration would not be able to acuate the gear change as rapidly as demanded by the vehicle confusing it. You check transmission fluid level with the vehicle running on level ground FYI.
TooFast4SHO said:
Not sure what rpm but it was a lot lower than my previous vehicle, somewhere around 2k at 70? I will have to check. I will also check the transmission fluid today after work. I just have no faith in the service people at the dealership but will give them a chance.
glock-coma
New member
Have you checked the knock sensor wiring? To confirm that it's not chaffed or rubbing against the intake manifold.
Ahh good question I forgot to update on that. I actually put it back to stock as it got kinda annoying. I was hoping for turbo spool noise not the blow off. The vehicle had a bit of hesitation before that which i was hoping would be fixed with plugs but didnt notice until today its still there but even a bit worse this morning.ZSHO said:
gdavenport
New member
Can you log ? Check your fuel trims to see if it's running rich. (-% values)
If you have an OBDII Bluetooth adapter and an Android device running Torque Pro, logging is very straightforward. I do find that the data is more consistently captured in the file if you have the gauges on an active "desktop" within Torque. You would be looking at Short Term Fuel Trim (banks 1 & 2), and Long Term Fuel Trim (banks 1 & 2). Also can capture timing advance, knock retard (custom PID for that), etc. I am sure one of the gurus on here can guide you on exactly what to log.
Once logging is complete, you can send the log to yourself in a CSV (Excel) format and look at the data. If you don't have too many parameters you are trying to log, you can set Torque to log every 1/10 of a second. I use the OBDLink device for faster speed, but normal ELM327 OBD adapters should be ok too.
Once logging is complete, you can send the log to yourself in a CSV (Excel) format and look at the data. If you don't have too many parameters you are trying to log, you can set Torque to log every 1/10 of a second. I use the OBDLink device for faster speed, but normal ELM327 OBD adapters should be ok too.
Follow what SHOdded and BigMac advice was and sometimes its basic maintenance you have to do on these cars such as grab a can of MAF cleaner and remove both of the MAP sensors and clean them,overtime they get dirty,filled oil,dirt and deposits,also clean the IAT sensor also,its called preventative maintenance,i always carry a can or two and good luck.
ZSHO said:
If the dealer cant figure out what's going on and fix it under warranty I will datalog. I already have the laptop and the program installed from my previous car that I did dataloging for my tuner. I just did not know what I need to look for. I will keep in mind about the preventative maintenance. I never owned a turbo car before and now I am nervous reading about them having issues. Hopefully my SHO will treat me well after this is resolved. I tested it again this morning and it definitely skips/misfire when I go to manual mode in 2nd gear and floor it, starts around 4k and does it 2-3 times on the way up to 6k. I will baby it for the rest of the time until this is resolved.
SHOdded said:
Well I took it in about a hour ago. Took a drive with the mechanic driving and what a surprise it was not doing it as bad WTF!!!. He could still feel it a bit so he will diagnose it with the computer they use. I also told him about the PTU and that it could be an issue, but what a surprise he did not even know what PTU is, I had to explain it. I feel like I am about to waste my time at this place. I hope to god they find something once they hook it up to the computer. I told him to drive it again once it cools down a bit since this morning even after it warmed up it was doing it a lot but when he drove it, the car did it just a bit WTF? Is it me, am I cursed ughhhhhhhhhhhhhh. I will update this thread once they call me back lol.
