CHEVROLET TRANSMISSION VACUUM MODULATOR SERIES
CHEVROLET TRANSMISSION VACUUM MODULATOR FREE

Was amiss, even though I could take comfort in knowing that I at least had a I thought I had finally solved my mysterious powertrain-jumping problem.Д«ut it eventually came back, revealing that something else On the open highway, the eighth-generation Buick Riviera is truly in its element, and the cruising felt smooth as silk for the entire roadtrip and for several weeks afterward. So I decided to give it a shot and replaced the valve, on a day when I happened to be taking the Riv on a three-day roadtrip to a destination about 150 miles away. Not measuring vacuum accurately could be resulting in incorrect shifts. It therefore seemed reasonable that a valve that was faulty and Throttle body, the valve measures the level of vacuum from the engine, which isДЄn indicator of how hard the engine is working-how much load itвЂ™s under, in One of the вЂњinformation inputsвЂќ that tells the transmission how much load theД®ngine is under and when it needs to shift. The job of the transmission vacuum modulator is to provide Conversely, when youвЂ™reД¬ruising gently down a flat stretch of road, or coasting downhill, the load is Point, itвЂ™s optimal to shift into a lower gear. YouвЂ™re climbing a hill, the load is higher, and when the load reaches a certain Load is one of the determinants of when a transmission should shift. When I dug a little deeper, it seemed to make sense. Hard-shifting scenarios that were resolved by changing out the transmission Owners of 3800-equipped vehicles ranging from other Buick Rivieras to ChevyД¬amaros of mid-to-late 90s vintage were describing seemingly similar However, through some research on forums, I found that some Occasions when I took a tech for a ride with me. Techs who road tested the car werenвЂ™tДЄble to replicate the problem-nor was I able to replicate it on a couple of The ECM wasnвЂ™t throwing anyД«ut an even bigger complication was that the occurrence of The occasional sensation of rough, jumping shifts. Period of a few months did not find anything conclusive about what was creating Meanwhile, several shops that I had check the car out over a I didnвЂ™t buy the valve on the spot, but it crossed my mind that it mightД«e related in some way to what felt to me like a shifting problem. Modulator valves in the catalog with consumable items like air filters and oilДЇilters even though, to my knowledge, the valve isnвЂ™t a routine maintenance Interestingly, the Fram catalog had transmission vacuum The existence of a part called the transmission vacuum modulator valve was something that I stumbled over, while flipping through a Fram catalog in an auto parts store, while I was looking for the part number for a replacement air filter. Went on the issue seemed increasingly random.

Times there seemed to be a loose correlation with colder weather, but as time Some days it would jump, other days it wouldnвЂ™t. Smooth out on its own, and there was usually a fairly long interval between Sometimes it would only jump once, other times it would haveДЄ few spasms over the course of a few seconds.

CHEVROLET TRANSMISSION VACUUM MODULATOR FREE

The sensation was that entireДЇront-wheel-drive powertrain was jumping, as if trying to break free from its When I would start to throttle back as I approached the crest of a hill I wasД¬limbing at a fairly high speed. Shifts at seemingly incorrect moments when the engine was under load, such as

It began when I started to notice what felt like rough

Valve-a cheap and easy DIY repair-emerged within my first year with the car. The issue that led me to replace the transmission vacuum modulator Three years, 2019 ended up being my most trouble-free and inexpensive year of IвЂ™ve written about those quirks in a past article that takes an in-depth look at the Buick 3800, so I wonвЂ™t go into great detail about them here.ДЄll that said, after investing a total of about $6,000 in

CHEVROLET TRANSMISSION VACUUM MODULATOR SERIES

But this overwhelmingly very positive ownership experienceД¬omes in spite of some maddening quirks of the Series 1 Buick 3800 V6 (1991вЂ“earlyДЎ995, with the вЂњSeries 1вЂќ designation being somewhat deceptive because it is inДЈ800), such as a number of plastic gaskets that make the motor rather prone to leaks

Chevrolet transmission vacuum modulator