997 C4S Hesitation

[ggrayeb]

I have a 2006 C4S that I purchased in June of 2006. I currently have 9,000 miles on it and just recently I've had problems with the car hesitating. The first time, I was getting on the highway and it happened. I tried downshifting and pushing the accelerator which did nothing. Two minutes later it stopped. i dismissed it as bad gas.

Three weeks later the same thing happened only this time it went on for 20 minutes before I got off the highway. I stopped an hour for lunch and then got back on the highway. The probelm continued. I got off the highway and went to my dealer. I explained the problem and they said it was probably bad gas (I only put high octane in it). It was a Saturday so I had to leave it there over the weekend until service opened on Monday. When I called on Monday, they said they drove the car and had no problems. They checked the computer and had no fault codes (Which did not surprise me since there was no error on the dash when I was driving it). I took the car home and had no problems until last night (about 3 weeks from the last time) when the same problem occured a few miles from home. I parked it over night, and when I drove it to work this morning it was fine. I know looking at some past postings about a year ago there were comments about a vacuum issue with the fuel cap. Some had experienced the probelm again after taking the cap off and putting it back on after running the engine. Is this really the solution? Everytime it happens, pull over, take the gas cap off, run the engine, put the cap on and continue? Seems a little crazy. Has anything new been identified as the possible cause. Thanks for any help.

Glen

[Danyol]

I had a very similar issue, no errors and no top end (nail it at high RPM, no kick in the back). It turned out to be a CAT that disintegrated and plugged up. Associated symptoms were a rattle from the exhaust (not everyone gets that).

I have a suspicion mine was as a result of tracking at Sebring FL, a notoriously rough track.

Maybe I'm getting more obsessive about these replies since people keep on saying it's not very common.

Good Luck!

[lmritter]

I have a 2006 C4S that I purchased in June of 2006. I currently have 9,000 miles on it and just recently I've had problems with the car hesitating. The first time, I was getting on the highway and it happened. I tried downshifting and pushing the accelerator which did nothing. Two minutes later it stopped. i dismissed it as bad gas.

Three weeks later the same thing happened only this time it went on for 20 minutes before I got off the highway. I stopped an hour for lunch and then got back on the highway. The probelm continued. I got off the highway and went to my dealer. I explained the problem and they said it was probably bad gas (I only put high octane in it). It was a Saturday so I had to leave it there over the weekend until service opened on Monday. When I called on Monday, they said they drove the car and had no problems. They checked the computer and had no fault codes (Which did not surprise me since there was no error on the dash when I was driving it). I took the car home and had no problems until last night (about 3 weeks from the last time) when the same problem occured a few miles from home. I parked it over night, and when I drove it to work this morning it was fine. I know looking at some past postings about a year ago there were comments about a vacuum issue with the fuel cap. Some had experienced the probelm again after taking the cap off and putting it back on after running the engine. Is this really the solution? Everytime it happens, pull over, take the gas cap off, run the engine, put the cap on and continue? Seems a little crazy. Has anything new been identified as the possible cause. Thanks for any help.

Glen

Greetings:

I have a 2006 C2S... 2843 miles. When I first purchased the vehicle I had a hesitation issue or more like " Cugging " on 2 occasions. I was told this is most likely when the fuel is at 1/4 tank. I now always keep my tank full and have not had the problem since. I also use an octane boost once in a while, maybe every 3rd or 4th tank. Does that help, that's up to debate. However by keeping my tank on the full side I have not experienced any " Chugging " .

Chromedome, North County San Diego

[vizcarra44]

I have a 2006 C4S that I purchased in June of 2006. I currently have 9,000 miles on it and just recently I've had problems with the car hesitating. The first time, I was getting on the highway and it happened. I tried downshifting and pushing the accelerator which did nothing. Two minutes later it stopped. i dismissed it as bad gas.

Three weeks later the same thing happened only this time it went on for 20 minutes before I got off the highway. I stopped an hour for lunch and then got back on the highway. The probelm continued. I got off the highway and went to my dealer. I explained the problem and they said it was probably bad gas (I only put high octane in it). It was a Saturday so I had to leave it there over the weekend until service opened on Monday. When I called on Monday, they said they drove the car and had no problems. They checked the computer and had no fault codes (Which did not surprise me since there was no error on the dash when I was driving it). I took the car home and had no problems until last night (about 3 weeks from the last time) when the same problem occured a few miles from home. I parked it over night, and when I drove it to work this morning it was fine. I know looking at some past postings about a year ago there were comments about a vacuum issue with the fuel cap. Some had experienced the probelm again after taking the cap off and putting it back on after running the engine. Is this really the solution? Everytime it happens, pull over, take the gas cap off, run the engine, put the cap on and continue? Seems a little crazy. Has anything new been identified as the possible cause. Thanks for any help.

Glen

Greetings:

I have a 2006 C2S... 2843 miles. When I first purchased the vehicle I had a hesitation issue or more like " Cugging " on 2 occasions. I was told this is most likely when the fuel is at 1/4 tank. I now always keep my tank full and have not had the problem since. I also use an octane boost once in a while, maybe every 3rd or 4th tank. Does that help, that's up to debate. However by keeping my tank on the full side I have not experienced any " Chugging " .

Chromedome, North County San Diego

Seems to me you have a gremlin in your car. Sometimes the dealer will not look further when they cant duplicate the situation, has to do with warranty not paying them for deep diagnosis time. any how make friends with the Shop foreman and get him involved so that maybe he starts to send some Ptec's in to porsche on your situation, I would personally hook up a scan tool with flight recording ability and graph the dme data for analysis, unfortunately the dealer scan tool does not have this ability.

vizcarra44

[ggrayeb]

I have a 2006 C4S that I purchased in June of 2006. I currently have 9,000 miles on it and just recently I've had problems with the car hesitating. The first time, I was getting on the highway and it happened. I tried downshifting and pushing the accelerator which did nothing. Two minutes later it stopped. i dismissed it as bad gas.

Three weeks later the same thing happened only this time it went on for 20 minutes before I got off the highway. I stopped an hour for lunch and then got back on the highway. The probelm continued. I got off the highway and went to my dealer. I explained the problem and they said it was probably bad gas (I only put high octane in it). It was a Saturday so I had to leave it there over the weekend until service opened on Monday. When I called on Monday, they said they drove the car and had no problems. They checked the computer and had no fault codes (Which did not surprise me since there was no error on the dash when I was driving it). I took the car home and had no problems until last night (about 3 weeks from the last time) when the same problem occured a few miles from home. I parked it over night, and when I drove it to work this morning it was fine. I know looking at some past postings about a year ago there were comments about a vacuum issue with the fuel cap. Some had experienced the probelm again after taking the cap off and putting it back on after running the engine. Is this really the solution? Everytime it happens, pull over, take the gas cap off, run the engine, put the cap on and continue? Seems a little crazy. Has anything new been identified as the possible cause. Thanks for any help.

Glen

Greetings:

I have a 2006 C2S... 2843 miles. When I first purchased the vehicle I had a hesitation issue or more like " Cugging " on 2 occasions. I was told this is most likely when the fuel is at 1/4 tank. I now always keep my tank full and have not had the problem since. I also use an octane boost once in a while, maybe every 3rd or 4th tank. Does that help, that's up to debate. However by keeping my tank on the full side I have not experienced any " Chugging " .

Chromedome, North County San Diego

Chugging is probably a better description. It seems strange to me that the same problem has happened to multiple people and a reason/solution has not been determined by Porsche. We can't all be crazy. I'm not really sure what level my gas tank was at when it happended but I'll keep an eye on that (although for a car of this level of engineering, I would think Porsche would have a better solution than "don't let the tank get below 1/4". Love the car when its running strong. The only days it sits in the garage are when the snow is falling hard here in CT! Just a little frustrated with this issue. Thanks for the response.

[jhbrennan]

I have a 2006 C4S that I purchased in June of 2006. I currently have 9,000 miles on it and just recently I've had problems with the car hesitating. The first time, I was getting on the highway and it happened. I tried downshifting and pushing the accelerator which did nothing. Two minutes later it stopped. i dismissed it as bad gas.

Three weeks later the same thing happened only this time it went on for 20 minutes before I got off the highway. I stopped an hour for lunch and then got back on the highway. The probelm continued. I got off the highway and went to my dealer. I explained the problem and they said it was probably bad gas (I only put high octane in it). It was a Saturday so I had to leave it there over the weekend until service opened on Monday. When I called on Monday, they said they drove the car and had no problems. They checked the computer and had no fault codes (Which did not surprise me since there was no error on the dash when I was driving it). I took the car home and had no problems until last night (about 3 weeks from the last time) when the same problem occured a few miles from home. I parked it over night, and when I drove it to work this morning it was fine. I know looking at some past postings about a year ago there were comments about a vacuum issue with the fuel cap. Some had experienced the probelm again after taking the cap off and putting it back on after running the engine. Is this really the solution? Everytime it happens, pull over, take the gas cap off, run the engine, put the cap on and continue? Seems a little crazy. Has anything new been identified as the possible cause. Thanks for any help.

Glen

Greetings:

I have a 2006 C2S... 2843 miles. When I first purchased the vehicle I had a hesitation issue or more like " Cugging " on 2 occasions. I was told this is most likely when the fuel is at 1/4 tank. I now always keep my tank full and have not had the problem since. I also use an octane boost once in a while, maybe every 3rd or 4th tank. Does that help, that's up to debate. However by keeping my tank on the full side I have not experienced any " Chugging " .

Chromedome, North County San Diego

Chugging is probably a better description. It seems strange to me that the same problem has happened to multiple people and a reason/solution has not been determined by Porsche. We can't all be crazy. I'm not really sure what level my gas tank was at when it happended but I'll keep an eye on that (although for a car of this level of engineering, I would think Porsche would have a better solution than "don't let the tank get below 1/4". Love the car when its running strong. The only days it sits in the garage are when the snow is falling hard here in CT! Just a little frustrated with this issue. Thanks for the response.

Does it happen in Sport mode? I've found "chugging" happens to me sometimes when in Sport mode - maybe the throtle remapping is not working correctly.

Edited June 23, 2007 by jhbrennan

[ggrayeb]

I have a 2006 C4S that I purchased in June of 2006. I currently have 9,000 miles on it and just recently I've had problems with the car hesitating. The first time, I was getting on the highway and it happened. I tried downshifting and pushing the accelerator which did nothing. Two minutes later it stopped. i dismissed it as bad gas.

Three weeks later the same thing happened only this time it went on for 20 minutes before I got off the highway. I stopped an hour for lunch and then got back on the highway. The probelm continued. I got off the highway and went to my dealer. I explained the problem and they said it was probably bad gas (I only put high octane in it). It was a Saturday so I had to leave it there over the weekend until service opened on Monday. When I called on Monday, they said they drove the car and had no problems. They checked the computer and had no fault codes (Which did not surprise me since there was no error on the dash when I was driving it). I took the car home and had no problems until last night (about 3 weeks from the last time) when the same problem occured a few miles from home. I parked it over night, and when I drove it to work this morning it was fine. I know looking at some past postings about a year ago there were comments about a vacuum issue with the fuel cap. Some had experienced the probelm again after taking the cap off and putting it back on after running the engine. Is this really the solution? Everytime it happens, pull over, take the gas cap off, run the engine, put the cap on and continue? Seems a little crazy. Has anything new been identified as the possible cause. Thanks for any help.

Glen

Greetings:

I have a 2006 C2S... 2843 miles. When I first purchased the vehicle I had a hesitation issue or more like " Cugging " on 2 occasions. I was told this is most likely when the fuel is at 1/4 tank. I now always keep my tank full and have not had the problem since. I also use an octane boost once in a while, maybe every 3rd or 4th tank. Does that help, that's up to debate. However by keeping my tank on the full side I have not experienced any " Chugging " .

Chromedome, North County San Diego

Chugging is probably a better description. It seems strange to me that the same problem has happened to multiple people and a reason/solution has not been determined by Porsche. We can't all be crazy. I'm not really sure what level my gas tank was at when it happended but I'll keep an eye on that (although for a car of this level of engineering, I would think Porsche would have a better solution than "don't let the tank get below 1/4". Love the car when its running strong. The only days it sits in the garage are when the snow is falling hard here in CT! Just a little frustrated with this issue. Thanks for the response.

Does it happen in Sport mode? I've found "chugging" happens to me sometimes when in Sport mode - maybe the throtle remapping is not working correctly.

No, it has not happened in sport mode.