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2005 STS
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193 Posts
Discussion Starter #1
Hi All,
I have STS V6 2005.
Now it was 3rd time while I was parking my car engine went off. Sometimes it accelerates with jerk even i didn't touch the accelerator.
If someone has experienced same can share his suggestion and solution.

I am trying to pin point where the problem is because I cannot replace many things on hit n trial basis. In kingdom its not easy to get spare parts and also very costly.


Thanks,
 

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Cadillac CT6 (2019)
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2,280 Posts
Is the check engine light on, and even if it isn't, try reading codes (you'll need a scanner), there may be pending codes.
 

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2005 STS
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193 Posts
Discussion Starter #3
No check engine light.

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should i go for cleaning of throttle body and fuel line??
 

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2005 STS
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193 Posts
Discussion Starter #4
I go to mechanic and he said its due to Alternator / Generator. Replace this and problem will b solved.
Did you guys agree with that?
 
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I go to mechanic and he said its due to Alternator / Generator. Replace this and problem will b solved.
Did you guys agree with that?
NO! That would not explain the unintentional acceleration.
 

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08 STS-4 N* 1SG, 08 DTS Luxury II, 04 Bonneville GXP N*
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3,210 Posts
Can't say if it will or not. A low voltage scenario can potentially result in a lot of different problems so I wouldn't discount that. But, I'd ask specifically why the technician believes this is a problem (what testing was performed and what was the result)? Even if this isn't directly related to the complaint, if there is a problem with it, it should be fixed first and carry on from there. You should never try and diagnose (other) vehicle problems with a known preexisting electrical system problem.
 

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2005 STS
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193 Posts
Discussion Starter #7
I have done throttle body cleaning thoroughly but still eninge jerks when car stops.
 

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2006 STS4 V8 1SG & 2007 STS V8 1SE
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8,178 Posts
Some early models did have inadequate clearance for the wiring harness at the throttle body. Since these cars do 'drive by wire' with no mechanical connection to the throttle pedal, a stressed connection could easily develop a short circuit and cause your issue.

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Jerking when stopping sounds to me like motor mounts.
 

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2005 STS
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193 Posts
Discussion Starter #9
Some early models did have inadequate clearance for the wiring harness at the throttle body. Since these cars do 'drive by wire' with no mechanical connection to the throttle pedal, a stressed connection could easily develop a short circuit and cause your issue.

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Jerking when stopping sounds to me like motor mounts.
So what should I do now.
 

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2006 STS4 V8 1SG & 2007 STS V8 1SE
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8,178 Posts
I think it requires knowledge & experience specific to 2005-6 STS throttle-control wiring. That spells a Cadillac dealer to me. Who is your best one within 100 miles?

If you know a good automotive electrical specialist, they might be worth a try. But a dealer would be better. Especially if it has happened recently.
 

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2005 STS
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193 Posts
Discussion Starter #12
Hi All,

I want suggestions from you guys. In winter season caddy drove very well, no stalling or went off. As today was a bit hot day n it start idling again which means in summer its gonna do stalling and engine went off.
Any idea why its behavior so different in summer and winter.
 

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2005 CTS/ 2008 DTS/ 2008 STS V8 N*/ 2011 CTS4 ALL W/D Pearl
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688 Posts
keep your oil level FULL. I would try a throttle relearn it is spelled out in your manual and only takes 5 minutes from sitting in the front seat.
 

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2005 STS
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193 Posts
Discussion Starter #14
no its not about the oil level.
there is something which is affected by outside temperature and engine stalls.
 

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2006 STS4 V8 1SG & 2007 STS V8 1SE
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8,178 Posts
Low oil level is known to cause issues with variable valve timing engine designs. The 4.6 V8 isn't as susceptible as both the V6's for a few reasons, not the least of which is the 8 quart oil pan in the Northstar.
 
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