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can't drive wot?

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Old 01-31-2007, 12:59 PM   #1
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i recently did full exhaust, pacesetter lt, tsp catted y, borla cat back. Now when I drive my 02 ss m6 runs fine from start to half throttle but if i attempt wot it laggs and has almost no power>? what do you think this could be and how to fix it/
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Old 01-31-2007, 09:15 PM   #2
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Dont quote me on this, but I had a similar problem on a different car and it turned out to be the MAF. Ran fine when I would ease on the pedal and all but if I punched it, the engine would bog and RPMs climbed VERY slowly. A guy told me he had the same symptons in his GT and it was his MAF. I replaced mine and the car ran perfect. Might be worth checking into.
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Old 01-31-2007, 09:35 PM   #3
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Try cleaning the MAF first. Just be careful with the little wires in there.
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Old 01-31-2007, 09:41 PM   #4
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Fuel Filter maybe?
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Old 01-31-2007, 09:53 PM   #5
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I'd guess MAF sensor needs to be cleaned...
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Old 02-01-2007, 02:37 PM   #6
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mine did the same thing and it was an airbox seal that had blown against the MAF screen. sure glad i didnt port that thing!
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Old 02-02-2007, 06:55 AM   #7
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O2's not heating up?
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Old 02-02-2007, 06:06 PM   #8
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i only have 2 of the 02's hooked up because of the lt's. Havent had the codes deleted for the back two yet? I'll check the maf but could it be the 02's as well?
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Old 02-02-2007, 10:47 PM   #9
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Quick easy test, just disconnect the MAF and take it for a spin.
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Old 02-03-2007, 09:59 PM   #10
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I disconnected the wiring to the maf but nothing changed still lacking all power past half throttle. Do i completely take off the maf for a mile or two? I also took it out and cleaned it with electronics cleaner and still no change. Would o2 sims for the back two 02 sensors help or is that not even close to the problem?
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Old 02-24-2007, 07:41 PM   #11
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i replaced the maf lid put a sb in for looks bought o2 sims for the back two and still nothing has changed. Now i have decent pull from low rpms but bog from 4-6k then full power at the top. Still cant go full throttle from idle to 6k but from then on its fine? Any clues?
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Old 02-24-2007, 07:59 PM   #12
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Just an idea don't know if it will help, have you ever replaced your front O2 sensors. I know that the actual sensor part is very sensitive. It may have been damaged during LT install, or you just may need a new maf?
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Old 02-24-2007, 08:11 PM   #13
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i just replaced the maf with the slp maf....I don't have a check engine light but I guess I can replace the front o2's. Anything to get my car running right again!!!
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Old 02-24-2007, 08:15 PM   #14
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Quote:
Originally Posted by KENS_SS_4
O2's not heating up?
o2's have nothing to do with WOT operation, they arent used at WOT.

Rule out O2's right off the bat.
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Old 02-24-2007, 08:17 PM   #15
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Quote:
Originally Posted by bryan02ss
i just replaced the maf with the slp maf....I don't have a check engine light but I guess I can replace the front o2's. Anything to get my car running right again!!!
O2's wont do **** for ya, they arent used in WOT operation. Dont even bother wasting your money or time dicking around with O2 sensors.

I would first check for a hairline crack in a spark plug, then the rest of the ignition system and the fuel system.
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Old 02-24-2007, 08:23 PM   #16
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brad8266 may be right. My car for two weeks has ran like **** normal dirve but does fine wot. Now that I changed my O2 it is running better in normal driving conditions but still bucks . My was due for an O2 change though since I just hit 80,000 miles and you can tell a difference!!
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Old 02-24-2007, 08:51 PM   #17
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my car only has 26k on it so i don't think im due for an o2 change. ShouldI just get plugs and wires changed now since I planned on upgraded them when I get my h/c packaged?
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Old 02-24-2007, 09:14 PM   #18
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If the car ran fine before the LT's and exhaust then something changed/happened during the install. It is highly unlikely that a part just went 'bad' during this install. I agree with brad8266. Check your plugs and wires. Maybe a plug is cracked or a couple wires are not seated all the way.

Probably a good time to change the plugs and upgrade the wires. My advice on the wires is make sure that you hear and feel the 'click' when putting the plug wires on. I was obsessive when I put my MSD's on. I insisted on hearing and feeling the click. Let us know what you find.
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Old 02-24-2007, 09:16 PM   #19
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k thanks for the help....gonna buy some new plugs and wires this next week
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Old 02-24-2007, 09:22 PM   #20
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I craked one plug when i did my headers, it was a tiny hairline crack, but it made my car run like ****.
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