Question about 1986 Pontiac Fiero

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My 88 Pontiac Fiero transmission (automatic) doesn't shift properly during warm weather. It fails to go into the highest level unless I force to shift by tapping the accelerator.

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  • Anonymous Mar 22, 2014

    wont move unless shifting manually



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This sounds like you have a dirty transmission filter . I would change the filter and transmission fluid on it . That should fix the problem but if it does not check the vacuum line to make sure it is on and not leaking.

Posted on Feb 26, 2009


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& what load the engine is under

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2004 Pontiac sunfire shifter gets stuck in "park" when cold.

Automatic Transmission Shift Lock Control Description and Operation
The automatic transmission shift lock control system is a safety device that prevents an inadvertent shift out of PARK when the engine is running. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of thew following components:
• The automatic transmission shift lock control solenoid
• The body control module (BCM)
• The powertrain control module (PCM)
With the ignition in the ON position, battery positive voltage is supplied to the automatic transmission shift lock control solenoid. The automatic transmission shift lock control solenoid receives a ground from the BCM. When the automatic transmission shift lock control solenoid is energized, the shift lever mechanically locked in the PARK position. When the driver presses the brake pedal the PCM sends a class 2 serial data message to the BCM. The BCM turns OFF the ground control circuit and this de-energizes the automatic transmission shift lock control solenoid. When the automatic transmission shift lock control solenoid is de-energized, the shift lever may be moved out of the PARK position. The BCM determines transaxle shift lever position through a class 2 serial data message from the PCM. The PCM receives inputs from the park/neutral position switch and determines shift lever position. When the BCM receives this information and determines that the shift lever is out of the PARK position, the automatic transmission shift lock control solenoid ground is opened.

Do you know what a DTC is ? Diagnostic trouble code !

DTC B2708
The body control module (BCM) controls the automatic transmission shift lock control solenoid. Positive voltage is supplied via the ignition 1 voltage circuit to the automatic transmission shift lock control solenoid. The BCM controls the ground circuit of the automatic transmission shift lock control solenoid . When the brake pedal is depressed, the BCM removes the ground allowing the solenoid to disengage. This action allows the vehicle to be shifted out of the PARK position.
Conditions for Running the DTC
DTC B2707

Your best bet mite be to have a qualified repair shop check it .

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During cold weather the engine runs fine but during warm weather the engine dies

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1987 pontiac fiero won't shift out of first gear automatic transmission. engine was just put back together from pieces. vacuume lines are hanging out don't know where to connect.

heres a vaccum diagram and alao make sure the passing gear cable is connect and adjusted if this car has one which i think it does, also check electrical connections are hooked up,heres two diagrams i labeled them, one is for the 2.5 engine and the other for 2.8 engine connect the vaccum line and retry it, hope this helps.d09847a.gifc3e18c5.gif

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1 Answer

How to change the automatic transmission oil and filter. On 4 cylinder engine

Check fluid level every 12 months or 7500 miles, whichever comes first. Transmission fluid and filter should be changed every 100,000 miles. On THM 250C transmissions, intermediate (front) band requires adjustment every 60,000 miles, or as required.
1. With vehicle on level surface, apply parking brake and let engine run at curb idle. Move selector lever through all ranges, ending in "PARK". Remove dipstick and wipe clean, reinstall, then remove again and check fluid level mark on dipstick. Fluid level should check between "ADD 1 PT." and "FULL HOT" marks on dipstick.
RECOMMENDED FLUID Use only Dexron II or equivalent automatic transmission fluid.
CAUTION: If vehicle has been operated for an extended period of time at high speed, or in city traffic in hot weather, or if vehicle has been pulling a trailer, an accurate fluid level cannot be determined until fluid has cooled down (approximately 30 minutes after vehicle has been parked).
So let's get started... 1. With vehicle raised and drain pan placed under transmission, remove front and side transmission oil pan bolts. Loosen rear pan bolts approximately 4 turns each.
2. Carefully pry pan loose with screwdriver, allowing fluid to drain. Remove remaining bolts and oil pan with gasket. Remove screen/filter-to-valve body bolts and remove screen/filter with gasket.
3. Thoroughly clean pan and screen with solvent and dry with compressed air. Paper type filters should be replaced. Install new gasket or "O" rings, lubricated with clean oil, into screen/filter assembly.
4. Install screen/filter assembly to transmission. Use new pan gasket and install pan. Add proper amount of fluid to transmission through filler tube.
5. Start engine with shift selector lever in "PARK" position and with parking brake set. Check fluid level and add as required. CAUTION: DO NOT overfill.

Best of luck :)

Oct 20, 2009 | 1986 Pontiac Fiero

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what code did the mechanic say it had on it was it a shift solenoid or torque convertor lockup solenoid.

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