Hesitation when accelerating
Staging Lane
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Joined: Aug 2005
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From: Arizona Two blocks north of Hell
I had a similar problem, but the car would stutter (sp?) cruising on the hwy. No codes either. These were new O2 sensors, but a local speed shop hooked up a data logger and was checking the read back off the O2 sensors in real time. My driver side was way different than the passenger in millivolt readings. Can't remember the actuall number but it was obvious. Changed to another new one and car ran fine ever since. See if you can get someone to read your O2s real time, because new isn't always "good". Just a suggestion...
Staging Lane
iTrader: (17)
Joined: Aug 2005
Posts: 85
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From: Arizona Two blocks north of Hell
You need to find someone or some place that can hook up to your diagnostic port and readback info from your O2s in real time. Maybe the tuning guys can chime in here if like HPtuners or Ls1edit has real time data logging. I think the guy at my local speed shop was just using a professional/mechanics OBDII scanner, but it was displaying the millivolt readings from the O2 sensors in real time. At idle I want to say one was like 5ooish millivolts and the other was like 900ish but jumping all over the place. I can't really remember the exact readings though. It was like $40 to figure out one of my new AC Delco O2s were bad and to delete air, egr, and rear O2s. New Bosch ones from Checker and no hesitation/stuttering since.
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Originally Posted by WS62000
Finally figured it out...It was the MAF Sensor
What was wrong with it? My car has always thrown a code for a MAF malfunction and it a rough/lumpy idle w/ a stock cam. I too can feel a slight hesitation when accelerating, do I need a new MAF?
Thread Starter
TECH Regular
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From: Lake Zurich, IL
Not sure what was exactly wrong with it, but those are the same symptoms I had with my car. I have a 224/228 cam on 112lsa, so the idle is rough, but the hesitation was horrible at around 2000-2500 rpms, now, with the new MAF sensor, that is gone.
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Joined: May 2006
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From: south jersey
Originally Posted by LS1LUNATIC
What was wrong with it? My car has always thrown a code for a MAF malfunction and it a rough/lumpy idle w/ a stock cam. I too can feel a slight hesitation when accelerating, do I need a new MAF?
