1999 Pontiac Grand Am SE 2.4L twin cam from North America
The car is great for about 175000 miles.. then it breaks down
I have had my Grand Am from day one. The car has been great until recently. I had a problem with the car sputtering at acceleration about 3 weeks ago, put it on a Tech 3 and got a code. Fixed the problem, was a small hose on some air flow part, cost $1.00 to fix. Now stupid car starts, but won't accelerate. Completely lacks engine power. Put it on the Tech 3 and it won't even throw a code. Replaced the timing chain and gears, reset timing and is still causing problems. Now I am in the process of changing the Coil housing. Heard that could be the problem. If that doesn't work I will check compression and fuel injectors. This car has been amazing, but when something goes wrong everything goes wrong at once. That just isn't right.
Would you buy another car from this manufacturer? No
Review Date: 8th September, 2007
24th Sep 2007, 18:47
Sounds like it could be related to the mass air flow sensor. Check the hose and associated connections between the air box (my term for it - where the air filter is located) and the throttle body. Did you disconnect anything during your repair, and perhaps not put it on tightly during reassembly? If there is an air leak in that area, it will cause hesitation (possibly severe), sputtering, etc. No guarantees that is the problem, but that is what I would check first. Not all answers lie in the Tech-3.
I would not recommend arbitrarily replacing coil packs unless you are sure that is the problem. It could be an expensive mistake. The tachometer would be going crazy if the coil packs were the problem. Also, those are easy to check anyway. If you disconnect the spark plug wires and check for spark the old fashion way, you will get a misfire code. But, if you have multi-meter with an inductive RPM pickup/clamp, you can check it that way; just look for a tach. signal. Or, a timing light with the same type of pickup will do the trick too. Just hook it up to the plug wire of the suspect cylinder (s) and make sure it blinks. But, I don't think that is your problem anyway. You would definitely be getting a misfire code, at the very least, if it were.