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AznGA
04-06-2005, 09:34 PM
Here is how my engine bahaves during acclearation. The RPM would go up, stop, go up, stop, and so forth. It's more apparent during WOT. What do you guys think? TCC? TPS?

iceman
04-06-2005, 09:47 PM
Sounds like when I had clogged injectors... but could be any number of fuel delivery / ignition issue. Start with the obvious.. how many miles, what kinda of maintenance done, what kind of plugs, any SES ??

AznGA
04-06-2005, 10:07 PM
68000 miles. Fuel injectors cleaned at around 45000 I believe.
No SES, I have NGK plugs and Taylor wires that I put in at around 40000.

iceman
04-06-2005, 10:10 PM
Ditch the taylor wires and NGK plugs IMO. Taylor wires = misfire city for me, very similar to the clogged injectors I've had, similar to what you are describing. Injectors can clog within a short time too unfortunately :(

AznGA
04-06-2005, 10:13 PM
I thought misfire will always throw SES light? So do you suggest going back to stock wires and plugs?

iceman
04-06-2005, 10:17 PM
A slight misfire will not always, it did not in my case and others that had problems w/ taylors.

You have to start eliminating things.. This kind of issue is what I had and others have had.. No SES, slight misfire. For some it's the wires, some it's the coil packs, some it's the injectors / fuel delivery, etc.. you get my point. As with any repair, you eliminate things one by one to isolate the problem. Easy things to start with are wires, yeah. Then move from there. Or just take it by a mechanic and let them fix it if you're not comfortable with it :ec:

skyguard
04-11-2005, 10:19 PM
Replaced my plugs in the GT, not that there was anything wrong with them, just wanted something a little more performant, so, installed Bosch Platinum quad fire. The engine ended up misfiring on all 6, reinstalled the original plugs, problem solved.

Andy_GT
04-12-2005, 09:17 AM
First thought that came into my mind is along the fuel delivery problem route. Try replacing the fuel filter (assuming there is one on these cars).

skyguard
04-12-2005, 06:51 PM
you assumed correctly, there is a fuel filter, mounted underside rear, right.

IMICEMAN
04-13-2005, 10:22 AM
Do you have any modifications on your car ?
(Like TOG headers, for instance ?)

AznGA
04-13-2005, 02:25 PM
I just have CAI and SLP exhaust for performance. I also have NGK plugs and Taylor wires. They might be misfiring.

iceman
04-13-2005, 02:53 PM
Taylor wires suck ass

skyguard
04-13-2005, 03:43 PM
Do you have any modifications on your car ?
(Like TOG headers, for instance ?)
unfortunately, not at this time, with my two sons playing hockey, guitar, etc. not much time or money to modify anything. Mods are a definate but until I get my hands on a second car or truck, it kind of S&%*k's to have a nice rig and drive it in 5 feet of snow.

CruzinGT33
04-13-2005, 04:12 PM
Clogged CAT!!! Replace it, trust me... had the same situation, its the exhaust flow... your engine can't **** properly and is getting all backed up.

AznGA
04-13-2005, 07:56 PM
I just got my fuel injectors cleaned and the problem is still there. At least one thing is eliminated. Please tell me our stock cat is supposed to last more than 70000 miles.

NorKoastal
04-14-2005, 08:45 AM
You might help your mileage out a bit. Why not get a high flow replacement??

AznGA
04-14-2005, 08:46 AM
I have SLP exhaust and I really don't want it any louder.

iceman
04-14-2005, 08:48 AM
Did you try putting stock wires back on?

AznGA
04-14-2005, 08:51 AM
I do not have stock wires, but I think I will pick up a new set and put them in. That will be the next step.

1hotgagt
04-14-2005, 08:16 PM
were exactly is the fuel filter i want to change mine and i looked under the back i cant find the damn thing anywhere. and i ahve taylor 8mm blue wires in my car from pfyc.com and they r fine no problems

SC/TGrandAm
04-14-2005, 08:30 PM
were exactly is the fuel filter i want to change mine and i looked under the back i cant find the damn thing anywhere. and i ahve taylor 8mm blue wires in my car from pfyc.com and they r fine no problems

If you dont know where its at your really going to have a hell of a time changing it or even figuring out how. If you attempt this were going to be hearing about you getting gasoline squirted in you eyes. Its worth it to go to a mechanic or a gm dealer to have it done.

SC/TGrandAm
04-14-2005, 08:33 PM
Please tell me our stock cat is supposed to last more than 70000 miles.

They might tell you that but that was not even close for me. Had the cat replaced around 25,000 miles because the parts inside of it broke off and clogged it making my performance like a 3 cyl geo metro. At 48,000 its time for another new one.

AznGA
04-14-2005, 09:46 PM
My catalic converter made rattling noises inside it, ever since I got my car new. I went to the dealer to argue for a new cat. They showed me some of the used 99+ GA GT's they had and they all made the same damn noise. Typical GM cat quailty I guess.
lol

badboy2451
04-14-2005, 09:51 PM
maybe thats what rattles on my car too....who knows anymore

shanpurr
04-15-2005, 07:43 AM
I just got my fuel injectors cleaned and the problem is still there. At least one thing is eliminated. Please tell me our stock cat is supposed to last more than 70000 miles.


hey guys this sounds like what happened to my car, it seemed like it only wanted to run on half an engine...the SES light came on and we took it to the dealership and they had to replace the cats... and the car only had 50K miles on it

CruzinGT33
04-15-2005, 10:08 PM
Get the CAT replaced yet? Mine was fine one day, then the next it was shot... I'm sure there was degrading performance, but it was a overnight change in drivablility.

SilverGAGT04
04-17-2005, 01:26 PM
GM gives a 8 year/ 80,000 mile warranty on the Cat. converter. How many miles do you have on your car?

Jeff99GT
04-25-2005, 05:33 PM
I had the same problem for a week or two.. My engine would jump between 2000-2200 RMP on the first hill I went up in the morning (so only when my engine was relatively cold). Ended up going on a roadtrip this weekend and my car died - had to put in a new alternator. The good news is that I haven't had the apparent misfiring problem since.

'99 Grand AM GT with about 110,000 km, totally stock. Has anyone else had to replace their alternator yet? I had to on my '94 Grand AM SE after about 5 years but I was told that was sorta due to bad deisng in the placement of the alternator, and that the problem had been fixed post '95. That could have been bull.

Jeff