Misfire / hesitation under acceleration ?

[06997S]

Anyone else experience this problem, and if so what is the cause??

Drove my '06 997s to work and home today - car ran fine. Went on a short errand tonight, and when I started my return home the car began hesitating or sputtering, almost like it was starving for fuel. The car only has 1100 miles on it!!

Any ideas or known problems matching this description?

[06997S]

Just an update...

The next day the car ran fine on the trip to and from work; I'm guessing it was bad gas from the last fillup, so I'm going to put some gas treatment in it and see how it goes. <_<

[thelion]

Anyone else experience this problem, and if so what is the cause??

Drove my '06 997s to work and home today - car ran fine. Went on a short errand tonight, and when I started my return home the car began hesitating or sputtering, almost like it was starving for fuel. The car only has 1100 miles on it!!

Any ideas or known problems matching this description?

My Friend John had exactly the same problem in his 997S the other day, he was confused so he went to our dealer, they said the same thing, probably bad gas. I haven't encountered it in my 2006 997 3.6 at all, 2900 miles so far.

Tom

[jaysickler]

Anyone else experience this problem, and if so what is the cause??

Drove my '06 997s to work and home today - car ran fine. Went on a short errand tonight, and when I started my return home the car began hesitating or sputtering, almost like it was starving for fuel. The car only has 1100 miles on it!!

Any ideas or known problems matching this description?

Take a look at my posting. The dealer used the same "bad gas" excuse on me as "thelion" mentioned in his January 9 reply to you. A number of people are having this problem and since no service codes are triggered Porsche says there is nothing wrong with the car. Clearly a car that sputters has something wrong with it.

[jean]

In the winter , many states require oxygenated fuels (MTBE etc. )

Essentially , adding of Methanol or Ethanol .

Porsche recommends you change your fuel source if any of the following problems occur :

- Deterioration of driveability or performance

- Substantially reduced fuel economy

- VAPOR LOCK and possible non-start problems, especially at higher elevations or at higher temperatures

- Engine malfunctioning or STALLING

Read you manual , and verify the above before accusing anyone of making "excuses"

I am not saying that you may not have a problem , but maybe the above applies ?

Edited January 13, 2006 by Jean

[Loren]

Anyone else experience this problem, and if so what is the cause??

Drove my '06 997s to work and home today - car ran fine. Went on a short errand tonight, and when I started my return home the car began hesitating or sputtering, almost like it was starving for fuel. The car only has 1100 miles on it!!

Any ideas or known problems matching this description?

Take a look at my posting. The dealer used the same "bad gas" excuse on me as "thelion" mentioned in his January 9 reply to you. A number of people are having this problem and since no service codes are triggered Porsche says there is nothing wrong with the car. Clearly a car that sputters has something wrong with it.

See my post here.

[davepro]

Anyone else experience this problem, and if so what is the cause??

Drove my '06 997s to work and home today - car ran fine. Went on a short errand tonight, and when I started my return home the car began hesitating or sputtering, almost like it was starving for fuel. The car only has 1100 miles on it!!

Any ideas or known problems matching this description?

Yes the same thing just happened to me. Here's the scenario. I put in 87 octane gas for the last few weeks. No problems with that, including the use of the first half of a tank (see later). I parked on Friday, had heavy rains and damp cool weather over the weekend, on Monday when I took it out the car sputtered on acceleration and seemed to be running out of gas, but seemed to not misfire at low revs and at 30-45 mph. At lunch I went out to the car and started it up and had no problems. The car revved nicely and pulled up to speed without problem. I put in a bottle of stp and filled up the remaining half tank with 89 just to be safe. The car is running fine now.

Possibly water was sucked in somehow over the weekend or at startup.

Possibly the gas was bad, but the first half tank was fine which is difficult to understand.

Possily some sensor was corroded or affected by the weather that a 20 minute drive rectified.

Possibly the use of 87 gas has a cumulative negative effect.

[Kaos]

Anyone else experience this problem, and if so what is the cause??

Drove my '06 997s to work and home today - car ran fine. Went on a short errand tonight, and when I started my return home the car began hesitating or sputtering, almost like it was starving for fuel. The car only has 1100 miles on it!!

Any ideas or known problems matching this description?

My Friend John had exactly the same problem in his 997S the other day, he was confused so he went to our dealer, they said the same thing, probably bad gas. I haven't encountered it in my 2006 997 3.6 at all, 2900 miles so far.

Tom

Had the same problem with my 4S at ~400 miles. Spoke to a tech at the dealership and he said they've had a few reports on this, and per Porsche it seems to be California destined vehicles mostly. Very well could be the fuel here. Anyway, he told me to just drive thru it and it should get better. That was last week and I haven't had it recur.

[BennyGca]

Wow, I've never had a problem with mine...

But I've always stayed above the recommended 93 octane.

Other than the cost, any reason you're using 87?

[snarf]

Anyone else experience this problem, and if so what is the cause??

Drove my '06 997s to work and home today - car ran fine. Went on a short errand tonight, and when I started my return home the car began hesitating or sputtering, almost like it was starving for fuel. The car only has 1100 miles on it!!

Any ideas or known problems matching this description?

This sound similar to a problem discussed a few weeks ago on renlist:

http://forums.rennlist.com/rennforums/show...ight=gas+vapour

" . . . there could be a pressure equalization issue with the gas tank / fuel lines and suggested the following:

1. turn engine off

2. open gas cap

3. start engine and run for few minutes

4. put gas cap back on

I'm happy to report this worked! Hopefully this will save someone else the agony and frustration should this same problem happen to you"

Hope your problem is so easily resolved.

[erikjwells]

This has happened to my 06 C2S twice in 4000 miles.... and the gas cap thing seems to be the fix.

They had it at the dealer for an entire day attempting to find a problem.. and they decided that it was related to a vacuum issue (ie. the gas cap maybe being loose)

1. turn engine off

2. open gas cap

3. start engine and run for few minutes

4. put gas cap back on

[Nsurg]

New to this board but glad I found it! My C4S of 269 miles just had a hesitation issue! Interestingly I filled the tank late yesterday. I doubt I got bad gas but the vacuum issue seems to make sense. Cap on... cap off!

[Nsurg]

New to this board but glad I found it! My C4S of 269 miles just had a hesitation issue! Interestingly I filled the tank late yesterday. I doubt I got bad gas but the vacuum issue seems to make sense. Cap on... cap off!

Just a follow up. No further problems since I did the "cap on...cap off thing." :cheers:

[dstrimbu]

Anyone else experience this problem, and if so what is the cause??

Drove my '06 997s to work and home today - car ran fine. Went on a short errand tonight, and when I started my return home the car began hesitating or sputtering, almost like it was starving for fuel. The car only has 1100 miles on it!!

Any ideas or known problems matching this description?

Yes the same thing just happened to me. Here's the scenario. I put in 87 octane gas for the last few weeks. No problems with that, including the use of the first half of a tank (see later). I parked on Friday, had heavy rains and damp cool weather over the weekend, on Monday when I took it out the car sputtered on acceleration and seemed to be running out of gas, but seemed to not misfire at low revs and at 30-45 mph. At lunch I went out to the car and started it up and had no problems. The car revved nicely and pulled up to speed without problem. I put in a bottle of stp and filled up the remaining half tank with 89 just to be safe. The car is running fine now.

Possibly water was sucked in somehow over the weekend or at startup.

Possibly the gas was bad, but the first half tank was fine which is difficult to understand.

Possily some sensor was corroded or affected by the weather that a 20 minute drive rectified.

Possibly the use of 87 gas has a cumulative negative effect.

Dave: 87 octane is a no-no with these cars... heck, 89 isn't even close. You NEED 93 octane fuel if it's available.. if not - buy the highest octane you can find (we have 93 in the Midwest, I know that other areas are limited to 92 or even 91...).

DME can only correct within a limited range for poor fuel. You risk engine damage if you continue to use 87 octane... needless to say your engine output is likely off quite a bit!

And, whatever you use - keep that tank full! I'm dealing with a tank of bad fuel right now, and it's frustrating - you don't need condensation building up in the tank to exacerbate the issues.

Just MHO. Be safe!

-don