Just replaced F1 clutch (with new F1 sensor) on 07 430 cpe. Car had approx. 20,000 mi. Problem was gear box warning light coming on and car slipping into neutral or locking in 3rd gear at slow speeds. Full clutch replacement repair done, in addition to tightening a loose bleeder screw. ($6000) Take car home from shop and original problem recurs several times. In addition to the bleeder screw , did I get screwed because clutch was not principal problem but a gear box actuator failure? I know a new clutch was due soon, but...
Your symptoms do not sound like a worn out clutch. Who diagnosed it and how? Who replaced the clutch and do they have an SD3 and understand its use?
Authorized Ferrari dealer, had all the latest SD3 etc, Computer showed an internal leak in F1 system. That was loose bleeder screw, I guess.
Well then maybe you need to find someone who has one and actually knows how to use it. Throwing $6000 at the car in the hopes it will fix the problem isn't really a good way to go about things.
SD3, now, indicates fault "gear engagement potentiometer". Part #248095 ($997). Thanks for your insight.
Niels- At least you have a new clutch, even if that was not the primary cause of your problems. What was the wear on the original clutch as measured by the SD3? Taz Terry Phillips
SD3 said 50% wear. In actuality wear was 60%. 2mm out of 5mm on original clutch left. Clutch was starting to slip a lot. Probably would have replaced it in March or April.
I hope so. I've never kept a Ferrari that was out of the warranty period. It's a brave, new and expensive world. I've been told that the costs are probably the worst for the original F40s.
Yes, this gear engagement potentiometer is more likely to be the actual problem ! However, I have observed several instances of SD3 misdiagnosis, which is a result of sequential problems that occur due to F1 hydraulic pump and power distributor unit failure. If there is inadequate pressure or air in the distributor system (one with solenoids and pressure accumulator; shown on the right hand side of the attached schema), then TCU is going through several "adaptive" cycles which involve clutch positioning sensor and gear engagement (positioning) potentiometers. At a certain point, TCU simply can not compensate and as a safety measure, returns the gears into "N" (best case scenario). Otherwise, gears get stuck, as in your case. Another friend of mine had described a similar problem like yours, which was corrected simply by removing and thoroughly cleaning those gear engagement potentiometers (there are two of those, as you may know, indicated by the #58 in the attached diagram). BTW, I've heard that those potentiometers can be purchased from other distributors for much less, as those are used on many other less expensive cars. Good luck. Image Unavailable, Please Login
Thanks for the info. All bleeder screws were tightened on F1 hydraulic system. Fluid was drained and refilled to maximum. Solenoid on E-diff does not show error. It seems this solenoid works off same hydraulic system as F1 system. It would be nice if potentiometer would need only a "cleaning". Less $$$. Car drives well with new clutch and only intermittently do I hear 5 sec. warning sound and illumination of gearbox warning light. It's so instantaneous that by the time you hear sound light is off. Final chapter not yet written.
2mm is a huge amount. The manual is way off with respect to remaining clutch life as physically measured. The slipping was a function of the F1 system and not the disc wear.
They are Pugeot parts. There is no Pugeot support in the US. There was very little even when the cars were sold here. I am sure they are much cheaper from a Pugeot sourch if one can be found and the correct part determined.
With Ferraris I always suspect wiring first then the part. Gold Connectors!!!!!! Maybe time to call the ghostbusters.
Just remember! If you get stranded on a highway due to locked gears (if you will not be abole to switch into "N") make sure that the tow truck uses a dolly system under your rear wheels when pulling onto a flatbed. Otherwise you will kiss you transmission and engine good bye.
If I could see the close-up photographs of this potentiometer part with clearly visible markings, I could most likely find a much cheaper source through my contacts in Europe... Does anyone know if these potentiometers are made by BOSCH or Magneti Marelli ???
A. you are are misspelling it. B. that entire thread was a cluster **** and is why anytime someone walks into my shop saying " I heard on Ferrari chat" I throw them out. C. Angular sensors are for the Motronics and not for Selespeed operation. Do not introduce that stupidity into this thread too.
RD, Way too funny! Since we have never met, one of these days I'll walk into your shop and say "I know about you from Fchat"...I'll make sure I don't see any of your rifles handy or a BFH (big fffing hammer). Actually you should use your quote as your Fchat signature.
Clutch slippage with 40% remaining? You mean clutch needs repalcing at ~50% wear? Doesn't make any sense to me.
Nah!! I had an F40 for almost 5 years.... daily drove it, tracked it, took trips and had zero failures. I changed fluids, did the timing belts myself, and drove it. I think I also did brake pads. The current attitude of "I can't have a car without a warranty" is crazy. Cars had 1-4 year warranties and after that, guess what? You either fixed your car yourself or paid someone to fix them.
