Car hesitates when upshifting for 1st
08-03-2009, 01:39 PM
#1
Car hesitates when upshifting for 1st
Has this happened to anyone else? Within the last two months or so under hard acceleration (65-70% throtle) the car pauses for about 2secs or so before upshifting from first. Its almost like shifting with stick. The engine rev's almost to red line then there's a noticeable monent before the tranny upshifts. This has happened once in DS mode and twice in D. This is a 08 with about 10k on it. I already know that when I take it to the dealer they'll ask for proof which of course I won't be able to provide.
Any suggestions or feedback is greatly appreciated.
Any suggestions or feedback is greatly appreciated.
08-05-2009, 06:44 PM
#4
Intermittent transmission shift issues are usually hard to diagnose.
Did you notice this shifting issue when the car is cold or after yo have driven for a while? Did it happen after a highway cruise or during local driving? Perhaps it was just after you beat on it a little bit? Depending upon the driving conditions, it may a simple adjustment or a more serious issue but with only 10k miles on the car it is likely minor.
Did you check the tranny fluid level level?
Did you notice this shifting issue when the car is cold or after yo have driven for a while? Did it happen after a highway cruise or during local driving? Perhaps it was just after you beat on it a little bit? Depending upon the driving conditions, it may a simple adjustment or a more serious issue but with only 10k miles on the car it is likely minor.
Did you check the tranny fluid level level?
08-05-2009, 08:54 PM
#5
I haven't checked the tranny fluids as the car was at the dealer about two months ago for an oil change etc. I've thought back about what/where it happened and in each case I was going up minor inclines - once going to the NJ turnpike, just after the last light. Once going up the incline for a bridge and the other time most recently going up an incline while going up an incline.
Its like the car is confused where I'm asking for more gas but it wants to upshift then just freeze's. Not sure if it should hold first or upshift. The pause is so distinct that in each instance I thought that I had knocked the car out of gear. I have on occasion accidentally knocked the car into neutral while driving causing the engine to rev with loss of forward motion. This is exactly how it feels.
Its like the car is confused where I'm asking for more gas but it wants to upshift then just freeze's. Not sure if it should hold first or upshift. The pause is so distinct that in each instance I thought that I had knocked the car out of gear. I have on occasion accidentally knocked the car into neutral while driving causing the engine to rev with loss of forward motion. This is exactly how it feels.
08-05-2009, 10:53 PM
#7
I haven't checked the tranny fluids as the car was at the dealer about two months ago for an oil change etc. I've thought back about what/where it happened and in each case I was going up minor inclines - once going to the NJ turnpike, just after the last light. Once going up the incline for a bridge and the other time most recently going up an incline while going up an incline.
Its like the car is confused where I'm asking for more gas but it wants to upshift then just freeze's. Not sure if it should hold first or upshift. The pause is so distinct that in each instance I thought that I had knocked the car out of gear. I have on occasion accidentally knocked the car into neutral while driving causing the engine to rev with loss of forward motion. This is exactly how it feels.
Its like the car is confused where I'm asking for more gas but it wants to upshift then just freeze's. Not sure if it should hold first or upshift. The pause is so distinct that in each instance I thought that I had knocked the car out of gear. I have on occasion accidentally knocked the car into neutral while driving causing the engine to rev with loss of forward motion. This is exactly how it feels.
Good luck
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08-06-2009, 09:24 AM
#8
My diagnosis - Low fluid. As you go up these inclines in a low gear, the trans fluid is moved to the rear of the unit causing the shift delay due to hydraulic starvation. Check the fluid on a level surface - i suspect you are SLIGHTLY low. Just a few ounces will make a difference.
Good luck
Good luck
Honestly it never dawned on me that I needed to check the fluids as I am on the most aggressive service plan from Infiniti and I didn't think that the fluids would drop off between service appointments. I also noticed that my oil level was a bit on the low side as well. Guess I should be more dilligent at checking these things myself and not depend on the dealer.
Thx to all that responded.
08-07-2009, 11:45 AM
#10
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I thought this was a characteristic of the transmission. Mines has been doing this since the day I bought it only in Manual mode. The older BMW M3 with the SMG tranny has this same characteristic. Its like the tranny disengages from 1st to 2nd gear like a manual clutch. There is alse a hard down shift from 2nd back to 1st as well.
08-09-2009, 08:52 AM
#13
Well I got it back yesterday and unfortunately they couldn't find the issue (no suprise there). However the master tech suggested that I (we) call HQ and file a complaint so that engineering can start investigating wether there is a more widespread issue.
Even though I didn't get that resolved the crazy squeaking/rattling from the sunroof/headliner/A pilar is now resolved.
Even though I didn't get that resolved the crazy squeaking/rattling from the sunroof/headliner/A pilar is now resolved.
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