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LS 430 Acceleration issues

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Old 06-19-12, 03:39 PM   #1
amcb
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Default LS 430 Acceleration issues

My 2002 LS 430 recently started misbehaving. When I floor the accelerator the car hesitates 3-4 sec then starts to accelerate. Almost like it cant find the gears. and once it starts accelerating it does not really go like it used to.

Any ideas?
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Old 06-19-12, 03:50 PM   #2
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you arent using regular gas are you? poor performance can result...
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Old 06-19-12, 04:07 PM   #3
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Default LS 430 Acceleration issues

Dirty D's Thanks, good point but this is beyond a quality of gas issue.
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Old 06-19-12, 04:28 PM   #4
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Could be throttle sensor is bad... had that issue with my RX. MAF might be bad too... hard to say.
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Old 06-19-12, 07:34 PM   #5
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My 2001 LS430 had a similar issue. The problem turned out to be an erratic MAF sensor and a dirty throttle body. Dealer replaced the MAF sensor and cleaned the throttle body and now it runs like new again. The transmission was not touched.
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Old 06-19-12, 11:12 PM   #6
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Do you have any engine knock/pinging?
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Old 06-20-12, 07:52 AM   #7
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Wouldn't this condition through a check engine light error, But this has not happened.

Did your condition turn on your check engine light?
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Old 06-20-12, 07:53 AM   #8
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Was your check engine light on with the erratic MAF?
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Old 06-20-12, 07:53 AM   #9
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No knocking or pinging.
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Old 06-25-12, 05:15 AM   #10
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The check engine light was NOT on when my LS430 had this problem. Dealer did say there was a history of some MAF codes but they did not cause the check engine light to illuminate.
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Old 06-26-12, 10:48 PM   #11
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I had a similar problem and it turned out to be a bad fuel pump. Had it replaced and no more problems.
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Old 06-27-12, 08:55 AM   #12
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Sure sounds more like a mixture problem than a transmission problem. Are there any codes to help narrow the possibilities?
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Old 04-03-13, 04:29 PM   #13
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I had it diagnosed and it turns out the K&N filter I use was allowing too much dust/oil past and built up on MAF sensor, cleaned that, problem went away.
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Old 04-03-13, 04:51 PM   #14
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Good to know. Also appreciate you updating this thread with what you found and how you corrected your issue. This will definitely be a help to someone else at some point.
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Old 04-03-13, 07:28 PM   #15
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Quote:
Originally Posted by amcb View Post
I had it diagnosed and it turns out the K&N filter I use was allowing too much dust/oil past and built up on MAF sensor, cleaned that, problem went away.
Throw that thing away. It's not worth the troubl imho.
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Old 04-03-13, 07:28 PM
 
 
 
 
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