car runs like crap
This is a discussion on car runs like crap within the General Help forums, part of the LSx Technical Help Section category; Just bought a 99 convertible Trans Am. It spits and sputters after 4500 rpm in first. I ran it with ...
06-18-2008, 04:28 PM #1
car runs like crap
Just bought a 99 convertible Trans Am. It spits and sputters after 4500 rpm in first. I ran it with a Gtech and it wouldnt break into the 14's. Where should I start?
06-18-2008, 08:27 PM #2
unless you have done it, do a full tune, plugs, wires, fuel filter, air filter. Fuel filter is important, a lot of people forget to change that thing
06-18-2008, 08:31 PM #3
- Join Date
- Aug 2005
- Thornton, CO
Red Tint Jewelcoat
- 2008 Trailblazer SS
I agree about the fuel filter.
Also, I disagree with any times the 'g-tech' spits out. Take it to a real track and see how it does.2008 Trailblazer SS
Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
Lowered, HID's, tinted.
1999 Pontiac Trans Am WS.6 #1747 SOLD
531.1 RWHP 481.3 FT/Pounds all motor.
06-19-2008, 04:27 PM #4
Well, I took it to the dealer and he says that the catalytic converters are bad. He wanted $1500 to replace them. Luckily I know someone who owns a shop and he is replacing them along with putting a magnaflow muffler with crome tips on it for $500.
Last edited by tg580; 06-19-2008 at 05:03 PM.
06-19-2008, 07:14 PM #5
- Join Date
- Oct 2007
- Cushing, OK
- 2000 Z28 M6 HT
06-20-2008, 01:46 PM #6
Well, the new cats didn't work. They helped a little bit. It ran 14.80's on the Gtech. What else should I try?
06-20-2008, 02:08 PM #7
How many miles? Probably as suggested a full tune up though. Then try cleaning out the MAF.
06-20-2008, 02:52 PM #8
06-20-2008, 03:22 PM #9
The car has 71000 on it. You'll have to forgive me for my ignorance here. I really dont know a whole bunch about cars. What is a MAF and how do you clean it? Also, What all should I do for the tune up?
06-20-2008, 04:28 PM #10
06-20-2008, 05:05 PM #11
- Join Date
- Apr 2008
- Madison, WI
1999 Formula WS6 M6-sold
- 2001 Silverado Z71
I agree. Get the car caught up on maintenance as described above.
The MAF is the Mass Air Flow sensor. It is located between the airfilter and the throttle body. Looks like this:
If your car is using a K&N type air filter and it is over oiled, the oil can get sucked into the MAF and contaminate the sensor and skew its readings. Basically the computer thinks there is less air flowing into the engine then there really is and the computer doesn't add the correct amount of fuel and the engine runs lean and crappy. Do a search on how to clean it.
06-20-2008, 05:12 PM #12
06-20-2008, 07:24 PM #13
so I should pull the MAF and just spray it down with the cleaner?
06-20-2008, 07:30 PM #14
06-20-2008, 07:33 PM #15
do you think that a dirty one could actually make the car run about a second slower than it should?
06-20-2008, 07:40 PM #16
What about a Hypertech power programmer?
06-20-2008, 07:44 PM #17
The MAF tells the computer the volume of air that is coming into the engine. If the MAF reports that less air is coming in than what actually is entering the engine, it will run lean, sputter, and just plain run like crap. Easily resulting in your full second of 1/4 mile time lost.
06-20-2008, 07:52 PM #18
its not really sputtering. I tjust seems like that it is not pulling real hard and revving that fast
06-20-2008, 07:59 PM #19
do the tune up ALL 8 plugs and wires and dont forget the fuel filter... it could be clogging and starving for fuel that will cost u about 120 bucks for all of it and check the air filter also dont know how much that is but it shouldnt be much since u can get a k & n for about 50 bucks
06-20-2008, 08:33 PM #20
Last edited by Speedy_Gonzales; 06-20-2008 at 08:35 PM.
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