Slight hesitation at part throttle?
08-06-2007, 09:04 PM
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Slight hesitation at part throttle? Just as it says. I sometimes get a slight hesitation when I slowiy give it throttle. Seems to be around 2800-3200 is where it happens. If I go real slow, or WOT all is totally fine. The plugs and wires are new and the TB and MAF look clean. I was thinking maybe a bad O2 sensor? Or is this life of a modded car LOL?
Thanks!
Thanks!
08-06-2007, 09:27 PM
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Originally Posted by sixgunsuperman99
mine's been doing it too around 2000/2500...hopefully someone knows 
I'm gonna try really cleaning the MAF with that spray stuff soon.
08-07-2007, 09:25 PM
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Originally Posted by kyemt
fuel filter, if it was o2 sensors it would throw a code woulndt it?
08-15-2007, 12:17 PM
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Same exact problem here. 98 C5. Take off, shifts into 2ed--then gradually ease into it. Strange hesitation between 2500 to 3000. Floor it and it doesn't do this.
New sparkplugs, wires, fuel filter, front O2 sensors, Techtron, cleaned MAF/throttle body, new TPS, cleaned grounds-------Anyone?
New sparkplugs, wires, fuel filter, front O2 sensors, Techtron, cleaned MAF/throttle body, new TPS, cleaned grounds-------Anyone?
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08-15-2007, 08:06 PM
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Originally Posted by SmashingPumpkins
Same exact problem here. 98 C5. Take off, shifts into 2ed--then gradually ease into it. Strange hesitation between 2500 to 3000. Floor it and it doesn't do this.
New sparkplugs, wires, fuel filter, front O2 sensors, Techtron, cleaned MAF/throttle body, new TPS, cleaned grounds-------Anyone?
New sparkplugs, wires, fuel filter, front O2 sensors, Techtron, cleaned MAF/throttle body, new TPS, cleaned grounds-------Anyone?
No idea here yet buddy....
Like I said, I'm gonna try a bottle of Tectron, make sure my wires are tight, clean my MAF, check the O2 sensors and change the fuel filter.
But most of that stuff should be okay, and isn't that old. I never thought about the TPS sensor though, usually if that's bad, you know it.
I'm coming to the conclusion that maybe it is just a small dead spot. I have read about this before, and a buddy of mine says his T/A does it sometimes. But he thinks it's his ported TB making it do it.
I'm at a loss....thankfully it's not a huge thing, and it is fine at easy throttle and WOT.
08-15-2007, 09:31 PM
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mine does it as well at times, but not sure on the exact rpm, and it is also very slight as yours. I always attributed it to something stupid like a little water in the fuel or bad gas, but I'm really just guessing and may be way off on that.
08-16-2007, 09:19 AM
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Yesterday I tried a little something--I unplugged the MAF, basically forcing it into open loop.
Doing that stopped the hesitation. Maybe a lean spot in my stock programing, Torque Management, or perhaps knock sensors retarding timing.
Crap--guess it's time to buy an HPtuners........
Doing that stopped the hesitation. Maybe a lean spot in my stock programing, Torque Management, or perhaps knock sensors retarding timing.
Crap--guess it's time to buy an HPtuners........
08-16-2007, 09:48 PM
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Originally Posted by SmashingPumpkins
Yesterday I tried a little something--I unplugged the MAF, basically forcing it into open loop.
Doing that stopped the hesitation. Maybe a lean spot in my stock programing, Torque Management, or perhaps knock sensors retarding timing.
Crap--guess it's time to buy an HPtuners........
Doing that stopped the hesitation. Maybe a lean spot in my stock programing, Torque Management, or perhaps knock sensors retarding timing.
Crap--guess it's time to buy an HPtuners........
Is your car an auto? Torque management is an A4 thing only right?
08-17-2007, 08:24 AM
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Originally Posted by SSINISTR SS
Humm, guess I can try that....
Is your car an auto? Torque management is an A4 thing only right?
Is your car an auto? Torque management is an A4 thing only right?
Funny thing is while unplugged the trans started shifting firmer. In addition to going open loop the car must have went into another backup mode----raising the line pressure in the trans.
Last edited by SmashingPumpkins; 08-17-2007 at 08:30 AM.
08-17-2007, 04:36 PM
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Originally Posted by SmashingPumpkins
Yeah, worth a try. Correct---auto in my car. I see you have a stick.
Funny thing is while unplugged the trans started shifting firmer. In addition to going open loop the car must have went into another backup mode----raising the line pressure in the trans.
Funny thing is while unplugged the trans started shifting firmer. In addition to going open loop the car must have went into another backup mode----raising the line pressure in the trans.
Weird that your line pressue went up too?
08-18-2007, 12:17 PM
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Originally Posted by SmashingPumpkins
Funny thing is while unplugged the trans started shifting firmer. In addition to going open loop the car must have went into another backup mode----raising the line pressure in the trans.
http://www.hptuners.com/forum/showth...7586#post87586
08-18-2007, 12:33 PM
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Originally Posted by SmashingPumpkins
I think I found some discussion/explanation as to why this happens:
http://www.hptuners.com/forum/showth...7586#post87586
http://www.hptuners.com/forum/showth...7586#post87586