2nd Generation S-series (1995-2005) Tech Discuss 2nd generation S-series (1995-2005) general tech topics here.

ka jerk

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Old 09-11-2011, 04:27 PM
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got this weird litlle jerk at a constant cruise speed it dont do it while i accelerate but just at a constant speed and rpm if hit the gas the power seems normal oil and temp gauges are normal and once i came to a stop it almost died once when i got to my driveway it seemed normal

bump^
 

Last edited by swartlkk; 09-11-2011 at 08:33 PM. Reason: *Combining Consecutive Posts* - Please use the edit function to add additional information in your post if another member has yet to respond.
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Old 09-11-2011, 08:32 PM
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Sounds like torque converter shudder. I had a more thorough post typed up, but saw your bump and figured I'd leave you to hunt for the info.

Please do not bump a post unless you have waited at least 24 hours as the rules of the forum require.
 
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Old 09-11-2011, 09:10 PM
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I had the same thing about a year ago. Ended up doing several different things at the same time and it has not come back.

From what I recall...

-clean MAF
-Seafoamed
-replaced cap and rotor (brass contacts)
-fuel injector cleaner (Lucas)
-fuel filter

And maybe another couple of three more minor maintenance items. One or a combination of two or more fixed the problem.

I thought it might have been the torque converter and really didn't want it to be so I tried a few other things to eliminate anything else first.
 
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Old 09-11-2011, 09:15 PM
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Torque converter shudder can be caused by many different things. The MAF sensor has been the #1 cause in my experience. If left go too long, it can either wear out the clutch in the converter, or blow the TCC solenoid.
 
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Old 09-11-2011, 09:31 PM
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can mass air flow be cleaned or just replaced sorry about the bump but a fresh post on topic takes it to the front page of the forum where its more noticeable again i apologise for the impateints
 

Last edited by zr2dan; 09-11-2011 at 09:43 PM.
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Old 09-11-2011, 09:36 PM
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it can be cleaned like ajbert stated
 
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Old 09-12-2011, 11:39 AM
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today i have also noticed black suet around the tip of my exhaust i have a pcm for less tune with the rear o2 deleted as well as the egr sensor and i have a ses will a dtc code reader still read a custom tuned obd2 and also i smell a fait smell of gas could my spider injection be the culprit
 

Last edited by zr2dan; 09-12-2011 at 11:42 AM.
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Old 09-12-2011, 12:08 PM
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A tune doesn't change the basic OBD2 structure of the PCM, it just changes what codes are valid to trip.

Clean the MAF sensor and see what that gets you.
 
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Old 09-12-2011, 12:25 PM
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thanks klye i found a nice how to thread on the cleaning so i will give it a shot tonight after work looks easy enough/ well i cleaned the maf sensor and went for a nice drive didnt have any jerk at any cruising rpm or speeds and seems like it ran a little smoother
 

Last edited by zr2dan; 09-12-2011 at 09:34 PM.
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