Hello there! What all does a factory radio control on a 1999 Pontiac Grand Am GT V6 3.4 liter Coupe? Car has not run right since removing it with an aftermarket stereo.

check version history, 99 to 05 and then 03 to 05 for coupe.

1999-2005 This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (November 2018) (Learn how and when to remove this template message) Fifth generation Overview Production April 1998-May 10, 2005 Model years Assembly Lansing, Michigan, United States Body and chassis Class Mid-size[34][35] Layout Transverse front-engine, front-wheel drive Platform N-body Related

• Oldsmobile Alero
• Oldsmobile Cutlass
• Chevrolet Malibu

Powertrain Engine

• 2.2 L L61 Ecotec I4
• 2.4 L LD9 Twin Cam I4
• 3.4 L LA1 V6

Transmission 5-speed Getrag F23 manual
4-speed 4T40-E automatic
4-speed 4T45-E automatic Dimensions Wheelbase 107.0 in (2,718 mm)[36] Length 186.3 in (4,732 mm) Width 70.6 in (1,793 mm) (1999-2000)
70.4 in (1,788 mm) (2001-05) Height 54.5 in (1,384 mm) (1999-2000)
55.1 in (1,400 mm) (2001-05) Curb weight Coupe: 3,066 lb (1,391 kg)
Sedan: 3,116 lb (1,413 kg)[37] Available in late spring 1998, the basic design of the fifth-generation Grand Am was shared with the Oldsmobile Alero (also new for 1999) and Chevrolet Malibu (introduced in 1996). The length was shortened slightly, but the wheelbase grew by more than three inches (76 mm). The suspension was now fully independent, with a revised MacPherson-Strut design upfront. The rear suspension is a more refined Multi-link design. The new Grand Am was offered in five trim levels: SE, SE1, SE2, GT, and GT1. The 2.4 L Twin Cam engine was carried over, with 150 hp (112 kW; 152 PS) and 155 lb?ft (210 N?m) of torque. GM's 3400 V6, previously exclusive to their minivans, became available as an option on the SE and SE1 and was standard on all other trim levels. For 1999, all the Grand Ams featured a 4-speed automatic transmission. The GT and GT1 also included 4-wheel disc brakes,[38] and all Grand Ams until 2003 included standard ABS and Traction Control (made optional on SE from 2003). The GTs also had a Ram Air induction system, providing an extra five horsepower and 5 lb/ft of torque over the 3.4 L V6 when installed in any of the SE-level trims.
The 2000 models added a Getrag 5-speed manual transmission as standard equipment with the four-cylinder. On GT models, the badge on the front fenders now read "RamAir V6", instead of "V6H.O." on 1999 GT's. ASC Creative Services designed the Grand Am SC/T for the SEMA show circuit, which was the concept design for the Ram Air hood and body package. The SC/T later became an appearance package, beginning in 2003. A road test by Car and Driver showed a 0-60 mph time of 7.7 seconds in a GT sedan with an automatic.[36]
For 2001, the SE2 trim level was dropped, a new family of Delco stereos and new wheel designs was introduced. The radio size in 2001 also changed from a 1.5 DIN size to a full 2 DIN size. Halfway through 2002, the Twin Cam 2.4 L engine was replaced by a new 2.2 L Ecotec four-cylinder, which had improvements over the engine it replaced, but produced less output; 140 hp (104 kW; 142 PS) and 150 lb?ft (203 N?m) of torque. Changes for 2002 also included a stationary cup holder in the center console as opposed to a removable one.
The body cladding on SE models was removed in 2003, a change which affected other models throughout Pontiac. Also in 2003, anti-lock brakes and traction control were made optional on the SE. In 2004, an MP3 player was added to the uplevel CD player. In 2005, Pontiac began phasing out the Grand Am lineup for the new G6 replacement. SE sedans were retained for fleet sale and GT coupes were the last Grand Am model available for public sale.

2003-2005 Pontiac Grand Am GT coupe The final Grand Am rolled off the line at Lansing, Michigan's, Lansing Car Assembly plant on May 10, 2005, shortly before the Lake Orion, Michigan plant began assembling G6 coupes. This was also the last car to be made at Lansing's old Fisher Body plant.
Available engines:

• 1999-2002: 2.4 L DOHC Twin Cam L4 (LD9 model) engine: 150 hp (110 kW), 155 lb?ft (210 N?m) of torque
• 2002-2005: 2.2 L DOHC Ecotec L4 engine: 140 hp (100 kW), 150 lb?ft (200 N?m) of torque
• 1999-2005: 3.4 L 3400 OHV V6: 170 hp,(175 for GT) 200 lb?ft (270 N?m) of torque (205 for GT)[39]

Available transmissions:

• 1999-2005: 4-speed automatic with overdrive (4T40-E for four-cylinder engines, 4T45-E for V6 engines)
• 2000-2005: Getrag 5-speed manual with overdrive (four-cylinder engines only)

What is your G6 coupe or sedan or convertible ?
Radio Speaker Amplifier Replacement (Coupe and Sedan)
Remove the rear compartment trim panel. Refer to Rear Compartment Side Trim Replacement - Right Side.
If it isn't there you don't have one . Check connections at the radio ! Connections OK replace the radio .
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Radio Speaker Amplifier Replacement (Convertible)
Remove the rear compartment trim panel. Refer to Rear Compartment Front Trim Panel Replacement.

1999 Pontiac Grand AM 2.4 liter DOHC L4 VIN "T"





1999 Pontiac Grand AM 3.4 liter V-6 VIN "E"





Hope helps.

you could have spark plugs that need changing or bad plug wires.the fuel injectors could be dirty not allowing enough fuel to be burned.at idle there isn`t enough load to cause a noticeable miss fire.

1999 Pontiac Grand Am Car Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Brown
Car Stereo Antenna Trigger Wire: Pink
Car Audio Front Speakers Size: 4? x 6? Speakers
Car Audio Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: 6? x 9? Speakers
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue

SPARK PLUG GAP IS 0.060 FOR THE 3.4L ENGINE.MAKE SURE YOU USE SAME FACTORY SPARK PLUGS.IF SPARK PLUGS WAS PLATINUM THATS WHAT YOU PUT BACK IN.TRY ANY THING DIFFERENT CAR ENGINE WILL RUN POORLY HAVE A LOT OF MISFIRE.

The radio will have to be removed from the dashboard.

Then post the radio make+model plus all the letters+numbers on any labels,barcodes or engraved in the metal casing.

Just the control switch.

Mine usually runs right smack in the middle. If it's middle or under you are fine. If it's over half way, then you need to change your thermostat, or you cooling fan isn't kicking on when it should. There is a temp sensor that controls the fan.

It is probably the problem. To make shure that need to change the gaskets, one of the symptoms use to be thet the temp rises when you are running at speed 50+ average, where is supposed that the car gets a lot of air due by the speed and nobody thinks that will be overheated.