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06-19-2017, 06:42 PM
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#1 | |
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AF Newbie
Join Date: Jun 2017
Location: Arvada, Colorado
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99 alero 3.4 bouncing speedometer
Ok so here's my problem
I have a 99 old alero 3.4 6clyndr When I start the car it's turns on fine and idles ok When the driving begins is where the problem begins The speedometer sometimes will stay stuck in 0mph While I'm driving After about a minute or so the needle on the speedometer begins to bounce up and down in between 0mph n how fast I'm actually going From there this has only happened twice since the problem began on Thursday of last week the rpm will go up high and the car won't accelerate But goes back to just the bouncing needle and Car doesn't run as smooth I've done Tune up New alternator New serpatine belt New o2 sensors both of them New air temp sensor New maf sensor New intake manifold with new gaskets New egr system New speed sensor New catylictic converter New fuel pump and filter New air filter New oil filter Replaced coil packs New cam shaft sensor.... |
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06-22-2017, 01:51 PM
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#2 | |
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AF Fanatic
Join Date: Jul 2011
Location: Worcester, Massachusetts
Posts: 5,017
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Re: 99 alero 3.4 bouncing speedometer
You replaced the transmission output speed sensor?
Basically, you need a scan tool to read data from that speed sensor...if the data is ok, but the speedometer isn't, possible cluster or PCM..... If data is bad, then you could have a wiring problem from the speed sensor.... You also need to scan for codes, all codes, not just P codes.... |
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06-22-2017, 09:40 PM
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#3 | |
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AF Newbie
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Join Date: Jun 2017
Location: Arvada, Colorado
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Re: 99 alero 3.4 bouncing speedometer
I tried getting my codes read at AutoZone today but couldn't because they said my service engine light wasn't on therefor it wouldn't read any codes
I did research on my own and found out that it could be the output speed sensor as you mentioned But I can't find where it's located |
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06-23-2017, 07:22 AM
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#4 | |
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Registered Offender
 
Join Date: Mar 2006
Location: Rural
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Re: 99 alero 3.4 bouncing speedometer
Many chain stores will have code readers, but not bidirectional scanners. You need a scanner to be able to read live data.
The VSS is located on top of the output/differential housing on a 4T60/65 transmission.
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