Hey Guys, I'm putting this issue down to 'character' for now but wanted to run it by you, in the last month or so at intermittent times and on around 4 occasions my car has hesitated when shifting between 1st and 2nd, no other gears are problematic, clutch isn't slipping it just takes an extra half second or so before engaging 2nd gear. F1 pump makes all the right noises and nothing seems out of the ordinary. It happened today for example after i'd been for a quick drive, all shifting was perfect then taking off from a light it just hesitated. I know it's maybe not the best explanation but it's the best i can do Again no other problems are apparent, last clutch reading was taken about 1000miles ago and was at 36%. Any insight or thoughts would be awesome Thanks guys. John.
Hi John, From what you've described, I'm thinking of a couple of things that may be need to be checked : 1) Gear Selection Position and Gear Engagement Sensors : installed on the gear engagement and selection actuator - detect the position of the piston actuating the selection and engagement of gears. 2) Gear engagement and gear selection actuators : controls gear engagement, disengagement and gear selection 3) Hydraulic solenoid valves gear 1 (EV1+EV3 + EV5) and gear 2 (EV2+EV3+EV5) but less probable there is an issue here as gear 3 to 6 seem to work fine and use also combinations of EV1 to EV5. I would bring it to the shop and get it diagnosted. Does this gear selection hesitation from gear 1 to gear 2 happens at any rpm or only in a specific rpm range? Stef
Thanks Stef, great info, the hesitation can happen at any RPM, would you think there would be any codes logged for this? John.
And is there more than one actuator or is it just the actuator attached to the gearbox that performs all functions? John.
John, there is only one actuator unit which is fixed on the gearbox. It's indeed very possible you got some errors stored in the TCU like : - GEAR RELEASE FAILED P1775 : Detected during gear shifting, when gear is disengaged - OPPOSITE GEAR ENGAGEMENT P1772 : Detected during gear shifting, when gear is engaged - GEAR ENGAGEMENTS WITH WRONG SHIFTS P1770 : Detected during gear shifting, when gear is engaged, without errors on the selection sensor. If you're not far away from a shop, I would ask them to connect a SDX and find out if there are any stored errors and make a complete gear engagement diagnosis and engagement travel control. Ask them to make also a complete check cycle. Stef
Hi Stef, Took the car into the dealer today and they hooked up the SD3, no fault codes stored and they couldn't find any fault with the system. Then on the drive home about half a mile from home 3 shifts from 1st to 2nd hesitated, on of the shifts it actually went from 1st to neutral, first time that's ever happened, it then engaged gear fine when pulling the right paddle, then as quick as it occured all was fine again. My clutch wear was also checked today and is at 40% with 23.5k miles on the car. They said they could try several things to try and find the issue but the actions they woud take i.e systems bleed etc would not be covered by warranty and due to the problem being intermittent they wouldn't know if any of he actions they take would fix the fault. So really i just need to keep driving the car, keep an eye on the issue, if it starts to get worse to the point it's repeatable or something breaks then i'll take it back in again. Through all this there have been no warning lights, no slow downs no F1 errors etc, problems like this are always the worst. Any other ideas? John.
Hi John, Sorry to hear that this issue started again. But at least, you know for now that no errors where stored in the TCU and all diagnostics were fine. That's a good start. Just a dump idea : are you sure there is no bad/random contact in your F1 paddles?
Interesting thought stef, doesn't feel like it would be related to that especially going into N but it's something else to check John.
Hi Guys, A PM reminded me I should come back to this thread and give some closure and have the info here for any future issues, it turns out that one of the bleed screws on my F1 actuator was a bit loose and was letting in some air, so the F1 system was bled, screws tightened properly and a relearn procedure was done, shifting has been fine since then. John.
Thanks for the update John. That's exactly what made me very nervous with dealer shops. Such bleeding screws should never get loose and should be checked each time during the yearly service in case of the previous service, they forgot to tighten it. You can understand why I don't want the dealers touch my car anymore A simple loose screw can lead to serious consequences. I'm controlling all my bleeding screws at least every 6 months in case of. I'm glad you got out of this proradic issue
Thanks for the update guys especially that the bleed screws need to be checked in the yearly service. I just did mine so I will ask if the service engineer checked it. Thanks again
It's unlikely the screws will be checked as part of the service as they're in a really stupid place you need to remove the actuator to get to them, god only know why they didn't put them on the side of the actuator you can get to John.
Oh I see now John. You meant that one of the 3 bleeding screws on the actuator got loose. That's another story indeed and I agree, it's not something easy to check on a regular basis
Hi all, i also have a problem with F1 gearbox..... when the car is cold .... 5-10 times i can switch to rewerse gear..... and on the 11th try.... i can'"t do this..... it goes from 1st to "n" ...... at the diagn show me P1770 "Gear engagements with wrong shifts" What is that.... 2 gears at the same time ... or .... bleed the system..... or..... something else.... i hope to help me some how..... Regards!!!
