Question about 1999 Pontiac Grand Prix

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Delay between the last two gears

I have a repair manual book that tells me this problems might be an AT Solenoid or a Transmission vacuum modulator, but I can't locate the modulator if it has one I don't know if my vehicle was equipped with one although I've looked in the right area to the books directions. If I can't find it then I must assume it does'nt have one. Any suggestions on where this might be or what the problem with the transmission might be? The last two gears cause your excilleration to have to speed up to 60 miles per hour before the last gear changes.

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Your transmission is a manual and in order to shift you have to have enough pressure built up so it is going to be your vacum and if you bought your car used then it might have been repace and put some were else or your looking at it and dont know it. and if its not that which i'm almost 100% certain that it is then your transmission is going out.

Posted on Jan 02, 2009

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I have an 88 Buick and its having a hard time switching into first gear can anyone tell me what they think it might be


You could probably do a world of good by replacing the transmission fluid. The fluid may of never been changed before and possibly some dirt got into your vacuum modulator ( or throttle cable linkage to the transmission). The modulator takes signals from the load on your engine and tells the transmission when to shift. If that modulator or whatever sensor is used on your particular car gets worn out or loses it's vacuum seal then the transmission will not get the proper signal when to change gears.

You might want to go on to YouTube and see if there is a repair video for your GM car. Seeing how it is a 1988 it probably still uses engine vacuum hoses to control the transmission shifting.
Try this link:
https://www.youtube.com/results?search_query=1988+buick+transmission+shifting+problems

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Dodge caravan


Both error codes you have are transmission related. P0736 is an error for reverse has wrong gear ratio. P0700 is a general transmission problem code
http://www.obd-codes.com/p0700
http://www.obd-codes.com/p0736
for more information.

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Why is tracker slow shifting from second to third gear


2doors or 4 doors?
3 speed or 4 speed transmission, I'm assuming its not a manual stick.
as those too can shift slowly on other oddities.
the 3/4 speed can delay shifts if the TV cable sticks or is adjusted wrong, as can the 3sp vacuum modulator vacuum hose fell off.
the 4 speed can delay for , the TCM sees transmission slip.
the 4 speed is electronically shifted , unlike the 3sp.
the 4speed flashes the OD lamp if there are troubles. (means scan it)
ask how.

http://www.fixkick.com/slush-pump.html


Oct 03, 2014 | 1992 Geo Tracker

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Transmission is fixed, has a new TPS and a new Oxygen sensor. After these last 2 things was install (past sunday). Vehicle now doesn't sound too accellerated but I still continue having problems with the...


Dont throw it off a cliff just yet :-) Just check the vacuum line from the inlet manifold back to the transmission, ensure that fittings are air tight and that there are no holes in the line.
Explanation for possible fix:- When the car is at idle the inlet manifold plenum has a reasonably high vacuum generated within it. The vacuum line to the transmission conveys this drop in pressure to the shift solenoid. When you accelerate slowly you hardly open the throttle and the vacuum remains high in the system. The solenoid allows early shifts through to the higher gears. If you accelerat hard the throttle is open wide and hardly any vacuum is maintained. The shift solenoid, in the absence of vacuum in the line, now holds each gear for much longer allowing the engine to use its full power band.
If the inlet plenum suffers from an air leak or the vacuum line to the transmission becomes loose or a leak develops in it the solenoid reads this as if the car is accelerating hard and wants to hold each gear for as long as possible. This situation sounds like your problem so check that everything is free of any possible leak. If you find a leak and cure it not only will the shift pattern be fixed but your engine idle will be much better too.

Mar 02, 2011 | 1997 Isuzu Trooper

1 Answer

I have no gears forward or reverse. My Vehicle is a 2003 Dodge Ram 1500 4x4 Hemi with 170,000 on the clock. Fluid is clean and full with no leaks. I have the following trouble codes:...


Your scanner will give you the code but it will not tell you how to fix your vehicle. Scanners basically tell you what systems to check or what systems are failing.

These are what your codes mean:

P0700: Transmission Control Module
- Shorted or open circuit within transmission control module (TCM)
- Failure of transaxle control module. This is just a informative code.

P0734: Gear ratio error in 4th gear
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit

P0732: Gear ratio error in 2nd gear
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit

P0731: Gear ratio error in 1st gear
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit

P0871: Transmission Fluid Pressure Sensor Switch C

P0876: Transmission Fluid Pressure Sensor Switch D

Emissions Codes:

P0400: Exhaust Gas Recirculation Flow Malfunction
- Harness or connectors (EGR volume control valve circuit is open or shorted.)
- EGR volume control valve stuck closed
- EGR volume control solenoid valve
- Dead (Weak) battery
- EGR temperature sensor and circuit
- EGR Valve

How to fix :
- Clean EGR Valve
- Repair EGR harness or connector
- Replaced EGR volume control solenoid valve
- Replaced EGR volume control valve

P0440: EVAP Emission Control System Malfunction
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Incorrect fuel tank vacuum relief valve

How to fix:
- Retight or replaced fuel tank filler cap
- Replaced damage or leaking EVAP canister

P0456: EVAP Control System Leak Detected (Very Small Leak)
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Incorrect fuel tank vacuum relief valve

How to fix:
- Retight or replaced fuel tank filler cap
- Replaced damage or leaking EVAP canister

P0441: EVAP Emission Control System Incorrect Purge
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Incorrect fuel tank vacuum relief valve

How to fix:
- Retight or replaced fuel tank filler cap
- Replaced damage or leaking EVAP canister

Based on the info check your EVAP system. I would check for leaks and maybe replace the EGR and the canister.

For the transmission check the TCM also you may need to take it to a mechanic though.

Hope this helps a little.

- Tech 101 (ASE CERTIFIED MASTER TECHNICIAN)
- Larson's Mobile Auto Repair
- 209-845-7620
- Oakdale, CA

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1 Answer

My 1997 Honda Civic has a few seconds delay engaging into Reverse. Forward gears have no problems but when i put it in "R" it takes like 5 seconds before engaging. Fluid level is ok.


Basically you should have the vehicle's reverse circuit pressure tested by a certified ASE Transmission Repair Shop.They will be able to tell you if there is a blockage in the cricuit, reverse shift solenoid is on its way out ,or a gearing problem even if there is a manual shift valve issue. Good luck

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2 Answers

94 dodge neon auto tranny


Hi,

Here is some possible reasons why your transmission is having those problems .

* The gear shift linkage is binding
* There is an internal problem in the transmission
* The throttle cable is broken or disconnected
* The vacuum modulator on the transmission is faulty or the vacuum line is damaged
* The electronic transmission control circuit may be faulty

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1 Answer

Transmission sometimes shifts hard into next gear.


Typiclly this is caused by a failing Pressure Control Solenoid. Now in some cases, since you are in the 1996 model year you may have a vacuum modulator that controls the shift firmness that can be replaced as it is externally mounted. I dont know how best to describe what it looks like, but look down on your transmission, on the front side facing the radiator and if you see a canister like device that has a vacuum line running to it, that is the vacuum modulator and you could start by replacing that and see if it helps.

If you do not have the vacuum modulator and have instead the electronically controlled version of your transmission then you will have a Pressure Control Solenoid and it, unfortunately, is located on the inside of the transmission and cannot be easily replaced without dropping the whole transmission.

The pressure control solenoid is a common issue with your transmission (4T65) and Im leaning more towards you have the electronically controlled version (4T65E).

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Lets all get together and form a class action law suit. This should be a recall. but no body has been killed yet.Our tax dollars get to bail them out so they on keep making defective products.I wounder would they except defective money for there cars.

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Transmission problem


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