Anarchist

*for those that don't want to read the backround* -- I *just* replaced my MAF, which solved a lot of problems w/ my max, got 8.5 sec
0-60 that day and today I got 9.7 with the same conditions. If you know of a problem that causes reduced accel aside from a blown MAF let me know.\
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The day I got it back from the MAF install, I took it out on a back road and timed the 0-60 ... which I know is not accurate to the millionth of a second by any stretch .. but give or take a quarter second, I got 8.5 secs (first try, traction control & overdrive on). Now I'm not expecting the 7.0/7.2 second time advertised, but then today when I went to test it it took 9.7 with the same exact gasoline, street etc. I eventually got it down to 8.8 with traction control and overdrive off, but it also doesn't feel as smooth as it did yesterday.

I did take it out for some driving last night with some friends ... nothing too crazy, just got bored and went through some parking garages not even hitting 40mph .. hit 100 once on some back road but hit it and backed off immediately.. so I don't see how either of those could've caused a problem between then and today.

It also pings/knocks/whatever you want to call it between first and second gears, like when it's going from 5500 to 2000 rpm, it sounds like a knock and the car jolts kind of .. nothing huge or too discomforting, but could possibly have something to do with the problem. I'm running 93 octane gas w/ the 3.0L engine if that helps with anything -- I'm stumped.

btw .. my apologies if this is something I could've found by searching, but I did a search for 5th gen acceleration loss and nothing of use came up.

spirilis

iTrader: (2)

Fuel system problems perhaps??

Anarchist

needing to be cleaned? replaced?

sloppymax

iTrader: (8)

if you replaced the maf yourself, did you make sure the sensor/element was facing the airflow? i think i remember you posting you had a 2k2 and you used a 2k1 maf and move the air temp sensor over?

Anarchist

no, I have a 2k and I had it replaced by the dealer.

Anarchist

I got some fuel system cleaner I'm planning on adding on my next fill up .. I'll update after I've driven on it a bit.

Jaws

The next place to look would be the coils. Have they been replaced yet? Pinging and poor acceleration are symptoms.

I30swimmer

maybe your VAIS is messed up.. 8.5 with the extra weight over the 4th gens and no VAIS would net an auto 2000 about 8.5 acceleration..

Epacy

iTrader: (6)

There is only one way the element can go back into the tube.

sloppymax

iTrader: (8)

i dont mean the way the sensor is in the tube, i meant the tube position was reversed. sorry, should have been more clear. however, since this was at a dealer, i hope that is not the case. honestly, the best advice i could give is to dyno the car. you will find out real quick and relatively inexpensive where any problems might lie. by seeing at what rpm you have an issue, it would be easier to diagnose than to just start throwing money at parts since you have no cel.

Patsmax

iTrader: (7)

try cleaning the throttle body behind the maf I did that yesterday and was surprised what a big difference it made with acceleration

tsk808

As for fuel system cleaners, a guy at Schucks recommended me some $3 one that performed just as good as the more expensive chevron brands, etc. I can't remember the brand but if it saves you money, it might help. Also, did you change your plugs? Might as well do your fuel filter too if it hasn't been done..

As for pinging, if you have time, try changing fuel grades to the 93 octane. If pinging stops, then stick with it for a couple of fill ups and if it comes back, then check for more problems.

takkar

Isnt 8.9 kinda normal for a 5th gen? I mean, the 5th gen has more oomph than a 4th gen, but then with 17" wheels, it blows? I get a 8.5 to 60mph with zero mods.p.s: I have an auto...

Anarchist

I have not replaced the coils, but I bought the car w/ 85,000 mi, so I would be surprised if they weren't replaced. Is there a way I can check?

Possible, but it's still fast and I think a blown VIAS would slow it down more than this.

don't have the time or experience to get in there

tsk808 - I bought some cleaner .. just filled up so I'll let you know if it works. I also have been using 93 octane gas for the majority of fill ups ... so I don't think that's the problem.

takkar - Fact is, I have gotten it to go faster, so something had to have happened between the new MAF and now.

I30swimmer

it costs you two hours MAX if you suck at it to clean the throttle body, and will cost you 3.99$ for a little carb cleaner.

and Yes a blown VAIS would slow you down into the high 8s. im running around 7.3 to 60 so.. you got some catching up to do. But im not afraid to get into my engine and keep it tip-top shape (ie. throttle body, VAIS, MAF)