 I think my 3sfe is mis-firing. |
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 May 3, 2012 - 5:15 AM
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Enthusiast Joined Apr 17, '12 From Napier Currently Offline Reputation: 0 (0%)  |
Hey guys, when im at 3000rpm in 2nd and 3rd gear. my car likes to jolt.. meaning slow down and then speed up within 1-2seconds.. what could this be? i got new spark plugs a couple of months ago. could it be o2 sensor? or Dizzy??
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May 3, 2012 - 5:43 AM
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 Moderator  Joined Jun 29, '08 From Denver Currently Offline Reputation: 59 (100%) |
Is your check engine light on? I'd start by seeing if you can pull any codes and go from there.
-------------------- "Employ your time in improving yourself by other men's writings, so that you shall gain easily what others labored hard for." -Socrates. Even Socrates told us to use the search button!
 2006 Aston Martin V8 Vantage. 1998 Celica GT- BEAMS Swapped. 2022 4Runner TRD Off Road Prenium. 2021 GMC Sierra AT4. |
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May 3, 2012 - 11:24 AM
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 Enthusiast Joined Oct 29, '11 From Haltom City, Texas Currently Offline Reputation: 1 (100%) |
I had this problem and it was the spark plug wires popping out of their tubes. They were new wires but for some reason two in the set didnt want to stay all the way down and snapped onto the spark plug. It would only do it in second gear. Probably not your issue but something to look at.
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May 3, 2012 - 12:29 PM
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 Enthusiast Joined Apr 22, '12 From Central NY Currently Offline Reputation: 5 (100%) |
I've had similar issues with both one of my Integras and my Legacy Sport. Is this usually happening when it is raining or at least damp out? Even if it's not, check all your ignition connections. Both times for me it was the coil pack shorting to the chassis before it could get to the plugs and it REALLY liked to do it when there was moisture in the air as it added a conduit for the electrical short. I had a pin hole in my MSD external coil pack on the Integra, the Subaru has a stock 4 post individual coil pack but one post was bad. So check the coil pack, look for any little (and I mean LITTLE) burn spots on it. Check your dizzy cap, check for green corrosion inside on the rotor and all the contacts inside the cap. Check plug gap, check ALL over all 8 boots of your plug wires for burn marks as sometimes you get a pin hole in them too. You gotta remember electricity will travel the shortest distance it can find to a ground.
I've found the best method is to start the car, get under the hood and rev the throttle to the point it usually does it and look at your components. That's how I found the little pinhole in my MSD coil, I saw it arc to the firewall. Or if you feel it HAS to be in gear, put the front on stands, have someone get in and recreate it while you look around the engine bay. I've had to do that too. This post has been edited by Xander_X: May 3, 2012 - 12:30 PM -------------------- 99 Celica GT-S
91 Subaru Legacy Sport AWD Turbo 2010 Acura RDX Turbo w/ Technology Package 68 Impala SS Convertable |
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May 3, 2012 - 8:59 PM
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Enthusiast Joined Apr 17, '12 From Napier Currently Offline Reputation: 0 (0%) |
Engine light isnt on.. Cheers guys. im going to have a look today then ill post you the results
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