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Engine start up quirk

Engine start up quirk

Postby Andy_V35Sky_350GT » Tue Nov 03, 2009 8:16 pm



Its been a while since I've posted anything, but lately I've found when I'm turning my ignition on from a cold start, the engine will rev to its usual 750-1000 rpm, drop down to zero (almost like a stall) before returning to 750.

Is this normal? This only seems to have been occuring since I had my last service.

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Postby joe603 » Wed Nov 04, 2009 4:15 am

6MT or AUTO?
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Re: Engine start up quirk (Andy_V35Sky_350GT)

Postby Poyzinous » Wed Nov 04, 2009 7:02 am

what was done on the last service?
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Re: Engine start up quirk (Andy_V35Sky_350GT)

Postby Andy_V35Sky_350GT » Wed Nov 04, 2009 2:03 pm

Auto.

Just an oil change and minor service. I also had the AC belt and bearing changed as it was wearing, but a part from that, nothing unusual.

The car has also taken on a deeper growl from both the engine and exhaust. Doesn't sound bad, actually quite the opposite, but this was related back to the belt change as before I had a very noisy belt.
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Re: Engine start up quirk (Andy_V35Sky_350GT)

Postby johnparkyourcar » Thu Nov 05, 2009 5:30 pm

Its probably just a vacuum leak somewhere. Mine does that too so i have to rev it a little bit everytime i start it. But I know its from my plenum spacer. I'm just too lazy to fix it...
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Postby joe603 » Fri Nov 06, 2009 4:48 am

It could be nothing...or it could be more expensive. Our cars have variable timing and it changes with the engine temp. On a cold engine, you'll notice more engine growl. This is all controlled by the computer.

Good news is that if it was a major problem, you'd probably have some indicator lights.

Check around for vacuum leaks from the AC belt change (they may have disconnect items to get to it).
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Re: Engine start up quirk (Andy_V35Sky_350GT)

Postby Poyzinous » Fri Nov 06, 2009 10:32 am

it may also be losing line pressure when its off. Try this... before starting it, cycle the key to on, then off, then on again and start it. See if you smell a little bit of gas around the lines.
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Re: (joe603)

Postby tollboothwilley » Fri Nov 06, 2009 1:05 pm

joe603 wrote:It could be nothing...or it could be more expensive. Our cars have variable timing and it changes with the engine temp. On a cold engine, you'll notice more engine growl. This is all controlled by the computer.

Good news is that if it was a major problem, you'd probably have some indicator lights.

Check around for vacuum leaks from the AC belt change (they may have disconnect items to get to it).
johnparkyourcar wrote:Its probably just a vacuum leak somewhere. Mine does that too so i have to rev it a little bit everytime i start it. But I know its from my plenum spacer. I'm just too lazy to fix it...
+1 This is probably the issue. I've also seen dirty Throttle bodies do this.

Let the car idle and listen for and air leak sounds.
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Re: (tollboothwilley)

Postby Andy_V35Sky_350GT » Sun Nov 08, 2009 2:44 pm

Thanks for the advice guys, I'll look into it!
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