Question about Cars & Trucks
Speedo needle stays at zero or erratically and violently swings between 60 & 80 after the car has accelerated from 0 to 70. After the car stops, the needle returns to 0 but quickly jumps to 40 for an instant then drops back down to zero again. Nothing I do will correct the problem. This is the main pattern I've noticed. There are other patterns, but the needle never stays steady to read the correct speed.
The symptoms you describe point to a loose or cracked speedometer cable. The cable likely needs to be replaced.
Posted on Apr 15, 2014
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Posted on Jan 02, 2017
Hi. I am the owner of a 2007 camry LE. And let me tell you, i still experience the same behaviors with my car as well. The erratic 30-40 mph shifting is either up or downshifting due to the innovation of the ECT-i (Electronic Controlled Transmission with intelligence) meaning the car has two ECUs, one for the engine and one solely for the transmission. Altough the engine recognizes the car is going at these speeds, the transm. keeps the highest gear (5th for 4 cyl engines, 6th for the V6 engine) at low revs, ergo, producing the rumbling vibration you hate the most. Mine has 40,000mi and never took it to a dealership, it is not as bad as it was at the begining. The Cruise Control situation, i have the same problem and is not gonna change, due to the same ECUs situation, both of them conflicting wether it is fast or slow, rich or lean, up or downshift, until they get a program solution. All i do is: engage cruise ctrl while on straightways and disengage when coming to an uphill. Other than that, I think is the best investment I've ever made. Just ordered a set of wheels for it this week. Hope this will help.
Posted on Aug 22, 2008
SOURCE: speedometer erratic/intermittent
I don't know what is causing this problem, but I know phil140701's answer is completely wrong on two counts. First, 740 Volvos starting at least in 1986 have electronic speedometers and no cable. There is an electronic sensor on the differential which sends a signal to the speedometer cluster. Second, if it were strictly mechanical with a cable then the voltage regulator could have no effect on it at all.
Posted on Sep 01, 2009
That type of speedometer has a sensor and plastic gear attached to it in the trans. Most of the time the gear is worn out replace the gear and all should be fine.
Posted on Feb 17, 2013
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