Help erratic idle and die after a minute

[Echapa13]

Hi I just bought a cayenne 3.2 V6 2006 base model, on my way home car was running fine, 

second day morning went to put some gas and after getting home car idle was rough Stop the engine and start back on now the car start goes to 1000 rpm for 5 seconds and then start shaking going to 500 rpm or less for about 30 seconds then car it self try to correct and goes to 1100 rpm for the same 5 seconds and then back to the bad idle.

If i press de gas pedal right after the start car goes fine without any issue to 4000 rpm for the same 5 seconds and then complete loose the power, back to the 500 Or less rpm. When the car try's  to correct back to the 1000rpm I can gas up to the 4000 rpm fine, is like a loop.

 

I have a Autel Scaner shows 1 code in the getaway

code 532 power supply 

 

what i have done:

new battery

new coils and spark plugs 

check fuel pump all good 

check the spark in the coils 

fix 2 vacuum pipes 

 

I have no idea of what else I live in Panama and I'm 600 miles away from the only Porsche dealer. I'm a mecanic but out of ideas now any help will be much appreciated 

thanks 

 

[Echapa13]

I post you 2 videos for better understanding 

 

Any help or idea will be appreciated 

[lewisweller]

2 hours ago, Echapa13 said:

I post you 2 videos for better understanding 

 

Any help or idea will be appreciated 

 

2 hours ago, Echapa13 said:

Hi I just bought a cayenne 3.2 V6 2006 base model, on my way home car was running fine, 

second day morning went to put some gas and after getting home car idle was rough Stop the engine and start back on now the car start goes to 1000 rpm for 5 seconds and then start shaking going to 500 rpm or less for about 30 seconds then car it self try to correct and goes to 1100 rpm for the same 5 seconds and then back to the bad idle.

If i press de gas pedal right after the start car goes fine without any issue to 4000 rpm for the same 5 seconds and then complete loose the power, back to the 500 Or less rpm. When the car try's  to correct back to the 1000rpm I can gas up to the 4000 rpm fine, is like a loop.

 

I have a Autel Scaner shows 1 code in the getaway

code 532 power supply 

 

what i have done:

new battery

new coils and spark plugs 

check fuel pump all good 

check the spark in the coils 

fix 2 vacuum pipes 

 

I have no idea of what else I live in Panama and I'm 600 miles away from the only Porsche dealer. I'm a mecanic but out of ideas now any help will be much appreciated 

thanks 

 

First thing to do is check your alternator. The voltage is way too low and the code 532 is for low voltage.

I would guess your alternator regulator is broke and also causing the idle problems as well. 

Charging voltage should be 13.7- 14.2 volts. 

[Echapa13]

Will check tomorrow morning and let you know thanks 

[Echapa13]

On 4/2/2017 at 3:05 PM, lewisweller said:

 

First thing to do is check your alternator. The voltage is way too low and the code 532 is for low voltage.

I would guess your alternator regulator is broke and also causing the idle problems as well. 

Charging voltage should be 13.7- 14.2 volts. 

 

I check the charging voltage and is 14v when the car goes to lower rpm the voltage goes to 12.5 or so. But I did separate fuel pump test and I have in one pump pressure unstable starts in 60 psi then goes as down as 20 psi (in that point is where the car whant's to stop and when the pump goes back to 60 psi the car goes to normal rpm yesterday I ordered today I'm going to replace it I let you know 

[lewisweller]

4 hours ago, Echapa13 said:

 

I check the charging voltage and is 14v when the car goes to lower rpm the voltage goes to 12.5 or so. But I did separate fuel pump test and I have in one pump pressure unstable starts in 60 psi then goes as down as 20 psi (in that point is where the car whant's to stop and when the pump goes back to 60 psi the car goes to normal rpm yesterday I ordered today I'm going to replace it I let you know 

This must be the left pump then?

 

So likely the rough rpm is causing the alternator to also deliver under voltage. Well see if the fuel pump replacement does the trick. Best of luck. 

[Echapa13]

On 4/4/2017 at 10:53 AM, lewisweller said:

This must be the left pump then?

 

So likely the rough rpm is causing the alternator to also deliver under voltage. Well see if the fuel pump replacement does the trick. Best of luck. 

In deed I replace the left pump now the car it doesn't dies, is much better but now when I'm driving it (now I can at least) it looses power and get like stuck, I'm replacing the right pump and crossing my fingers to finally fix the issue 

the whole forum is great and it has been a great Place to look for information 

[lewisweller]

53 minutes ago, Echapa13 said:

In deed I replace the left pump now the car it doesn't dies, is much better but now when I'm driving it (now I can at least) it looses power and get like stuck, I'm replacing the right pump and crossing my fingers to finally fix the issue 

the whole forum is great and it has been a great Place to look for information 

You might consider replacing the fuel filter and possibly the regulator if when tested it doesn't hold 3 bar after ten mins of being switched off. 

[Echapa13]

Long story short was fuel pumps, I replace 1 the car got better (it didn't die) but when you drive it, car won't accelerate replace the other pump and now everything good.