20 Most Recent 1999 Pontiac Grand Am GT Questions & Answers


Hi I have a 04 am gt and I just found that plug broken on my car. I am not sure wher u can get one yet but is the main ground point for that area u need it or its going to affect other things.

1999 Pontiac... | Answered on Oct 15, 2018


I had the same problem on my 1999 Pontiac GA 3.4 litre. Replaced a bunch of stuff. It just kept pushing the coolant out the overflow once the temp got to 200 + like to drove me nuts. Ended up being that reservoir. If you measure the O.D. of the cap(brand new cap) and the I.D. of the reservoir filler neck there is no way it will seal(even tried to fit a different type cap,no luck). The system has to be able to build pressure or the coolant will boil out at 212. Causing the coolant to be pushed out the reservoir. Why? you say or How? did the filler neck increase in size. I dont know but GM has write ups about this problem. They say sand it with a piece of sandpaper to smooth it. Maybe someone sanded it way to much?? Around $40 bucks and I was on my way. Hope this helps someone.

1999 Pontiac... | Answered on Sep 18, 2018


Hi, majority of car A/C systems hold about 3 pounds of R134a refrigerant. Mike

1999 Pontiac... | Answered on Jul 17, 2018


i would check fuses first then check for power to dashboard insterment panel

1999 Pontiac... | Answered on Apr 19, 2018


You will have to retrieve the engine faulty code with a scanner to see.
Explaining in some case when the PCM (Powertrain Control Module) sense a problem for some code it will deactivate the TRACTION system for security.
I believe there is a faulty code after the code is solved then erase all codes and try again. The TRACTION light should be back on.

Hope it helps.

1999 Pontiac... | Answered on Feb 24, 2018


Without testing hard to say . Do you know anything about automotive electrical systems , OBD 2 engine management system ? IAC - idle air control ? What engine sensor data is ? Hooking up a professional type scanner , reading DTC'S etc.... How to test electrical circuits using a DVOM - digital volt ohm meter ?
007 Idle Speed Problems Scan Data for Idle

1999 Pontiac... | Answered on Feb 13, 2018


replaced front and back brakes already ??? This has nothing to do with the ABS ,traction control is part of the anti-lock brake system . Light's on DTC'S - diagnostic trouble codes stored in the ABS control module . Sorry but , your best bet ,take your vehicle to a qualified repair shop , before you hurt yourself. Take's year's to learn how to diagnose these electronic control systems

1999 Pontiac... | Answered on Jan 07, 2018


you need to find and replace the sensors

1999 Pontiac... | Answered on Nov 05, 2017


May be a burned out exhaust valve.
Fix requires pulling head and valve job. May be expensive depending on the engine and not worth it for the age of the car.

1999 Pontiac... | Answered on Oct 02, 2017


Is it leaking from the Transmission pan Amy.

1999 Pontiac... | Answered on Sep 11, 2017


Before listening to someone telling you to replace plugs & wires an filter an injector cleaner etc. An when that doesn't fix the problem they say the MAF sensor or coolant temp sensor ,throttle position sensor . Spend a 100 bucks for diagnostics an then know for sure whats wrong . So many sensors an electronic's on you vehicle . See this guy above isn't a tech . back yard shade tree probably . He is all ready telling change the filter an if that doesn't work change the plug's an wires an this an that .
Have scan data checked first ,before replacing any parts . I have thirty years experience , Dealer ship , independent repair shop , own shop , mobile diagnostic tech . I charge $24.50 to hook up scan tool ,factory scan tool , an view engine sensor data . Could most likely be a bad or dirty mass air flow sensor . O2 sensor .

002 Fuel System Tests Start Here

1999 Pontiac... | Answered on Jul 20, 2017


Evaporative Emission System Leak Detected (small leak), check for leaks.

1999 Pontiac... | Answered on Jul 17, 2017


Check the transmission fluid level. Also check the rear differential if your car has one ( I think the 99's were still rear wheel drive) for fluid. If either of these are low, the fact that things are fine indicates that the low fluid level is causing problems. Also, the trans fluid should be a nice pink color. If it isn't then the transmission is not in good shape and should be looked at again by the rebuilder. If the fluid levels are fine, have the rebuilder check the trans again to see if he missed something.

The issue with the temp gauge is entirely separate except if you mean that the car begins to heat up when the shifting problems are occurring. If the temp gauge goes way up then comes down quickly regardless of how the car is being driven, the thermostat may be sticking and should be replaced. If the car is hard to drive and then starts overheating, the transmission may well be defective and causing the engine to work harder than it should.

1999 Pontiac... | Answered on Jul 10, 2017


The Trac off and abs lights being on together are a related problem. With your check engine light on shop should be able to tell what is wrong. Go to AutoZone or similar and have them scanned the computer for codes then get a new shop

1999 Pontiac... | Answered on Jul 06, 2017

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