Question about 1989 Buick LeSabre

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Need to change the modulator valve in the trans

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Some are on the outside of the trans near the tail end there is a small bolt that hods a fork on the base of it remve bolt and fork remove vacum or elec and pop it out

Posted on Apr 16, 2009

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1 Answer

What should I check?


could be a modulator valve. the fluid and filter may need to be changed. if the tranny is equipped with an electronic shift sensor, it may be bad.

Aug 14, 2014 | Cars & Trucks

1 Answer

My full size 1988 ford bronco 4x4 wont shift out of first gear could it be a simple fix?


It could be a simple fix, have you taken care
of this trans? Changing filter an fluid as
directed? That would be my first steP.
my second step would be to check the vacce
lines on trans an change the modulator
valve. Get back with me

Jun 13, 2014 | Cars & Trucks

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Why does transmission jerks when shifting 2-3 gear


just as precaution, have you been changing the trans fluid as recommended. Start off simple, check the fluid level, change the fluid and filter if due. Read the owner's manual for how to check the fluid level. Check for any loose wiring connectors that go to the trans. IF this is no help. Get to a reputable trans shop.

Jun 11, 2014 | 2002 Toyota Camry

1 Answer

1995 Saturn automatic trans. shifting hard enough to brake motor mounts. Any suggestions for fixing


you may need to change the modulator valve on transmission and also check the modulator valve to be sure it's getting the proper vacum to it. the modulator valve controls shifting in the transmission. also suggest lucas transmission treatment be added to transmission fluid, it frees up stuck valves in transmission. hope this helps!!!

Sep 11, 2010 | 1995 Saturn Sl

1 Answer

Tranny shifts good when cold but as it warms and gets hot shifting is difficult. Fluid is good. Was told it could possibly be modulator valve? Any help? Thanks, Ken


It does not have a modulator valve.But change the fluid and filter in the trans.Use the recommended atf fluid,and add a supplement called lube guard at NAPA.It is for a dodge and Mercron applications.This is a supplement for eliminating friction,and it treats the valve body in the trans.Shifting is easy and should stop your problem.If this does not stop the problem,you will need a new trans.If I can help,let me know,hope I was helpful,don`t always tell you what you want to hear,but it is the truth.

Sep 09, 2009 | 1996 Dodge Ram 1500 Club Cab

1 Answer

Does a 1994 Toyota 4Runner have a Modulator Valve? If so, where would it be located? Also, does it have a Shift Linkage? And if so, where would it be located as well? Thanks!


If your 4Runner has an automatic trans., then it has a modulator valve located on the trans. itself (should have a vacuum hose connected) and whether it's automatic or standard it will have shift linkage that connects the shift lever in the car to the trans's shift shaft.
I hope this helps.

Sep 03, 2009 | 1994 Toyota 4Runner

1 Answer

2003 Chrysler 300 check engine codes p0700 and 1776, car occasionally drops into 2nd gear - limp home mode - and will not shift out. Turning off car corrects the problem for and hour or for days. Does this...


THERE IS A TECHNICAL SERVICE BULLETIN FOR P1776..SOLENOID SWITCH VALVE LATCHED IN THE LOW/REVERSE POSITION..YOU NEED TO HAVE SCANNED AGAIN AND HAVE "EVENT DATA" READ..
LOOKING FOR TRS CODE..IF IT READS TR2,YOU NED TO HAVE TRANS SHIFT CABLE ADJUSTMENT CHECKED AND FOR BINDING AS WELL..IF IT READS OD,VALVE BODY OF TRANS MAY HAVE A STICKING SOLENOID SWITCH VALVE IN VALVE BODY..ALSO IF TRS CODE LEADS YOU TO VALVE BODY ISSUE..YOU NEED TO HAVE SOLENOID PACK BUILD DATE CODE CHECKED..IF IT FALLS IN A CERTAIN DATE,YOU REPLACE THE SOLENOID PACK,NOT THE VALVE BODY..A GOOD TRANS SHOP OR CHRYSLER DEALER WILL BE ABLE TO DIAGNOSE THIS PROBLEM..ALSO TCM IS PART OF PCM ON THIS YEAR VEHICLE AND YOU CANNOT SWAP ONE FROM ANOTHER VEHICLE..BUT I DON'T THINK YOU HAVE A CONTROLLER ISSUE..THE LH VEHICLES I HAVE SEEN WITH THIS PROBLEM THE SOLENOID PACK ON TOP OF THE VALVE BODY IS THE TROUBLE..I WORK AS A CHRYSLER TECH..13 YEARS EXPERIENCE

Jul 16, 2009 | 2003 Chrysler 300M

1 Answer

My nissan sunny GA15DE was overhauled but started having rough idle immediately threafter. what could have caused this? Gerald


Gerald:Was the engine overhauled because of the smoking problem? If so, the auto trans solution is more likely your problem. Good Luck
  • Automatic transmission? - Check vacuum line to transmission . The only line of rubber going to trans. Located where it attaches ro trans and rwmove it watching to see if it contains any trans fluid. If hose has oil in itm Then replace the valve it was attached to. The valve is called a transmission modulator. The diaphragm is rupture and aloowing engine vacuum to **** and burn the fluid. your trans should be needing fluid too often. Modulator around 12.00 last known.
  • Manual transmission ? - PCVvalve not bafflrd against drawing oil from its location in valve cover.and or Pcv valve is defective. Cheap fix-replace

Apr 13, 2009 | 1994 Nissan Sentra 4-Door

1 Answer

Gear shifting


Hello, The proper name for this A/T control module. Be careful because there are many other factors that control the transmission shifting like shift solenoid, throttle valve solenoid, trans speed sensor, trans temp switch etc. etc.
I hope this helps.
CYA, Gator241

Jan 26, 2009 | 2000 Mercedes-Benz S-Class

3 Answers

94 trooper, auto trans.Does it have a modulator valve


If you are talkin about the egr valve, than yes it does. It can also be called the EGR Modulator valve, so your Trooper does have that but its not the culprit to your problem. If it was your EGR modulator valve, when you gassed it, it would die on you. I would check on your input or output speed sensor or BCM.

Dec 06, 2008 | 1999 Isuzu Trooper

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