I have a Porche Cayenne s 2008. In the morning my truck starts with no problem. After I drive for a while and park and try to start again it does not want to start. If I let it sit for a while it will

Timothy Green
10

Asked by Timothy Oct 17, 2013 at 12:16 PM about the 2008 Porsche Cayenne S

Question type: Maintenance & Repair

It seems that it does not want to start when
hot. I changed batterie,spark plugs. And
cleaned fuel injection

8 Answers

Timothy Green
10

What can be done

1 out of 1 people think this is helpful.
judge_roy
Not Active

sounds like a condition called "vapor lock" where the gasoline boils and when it gets to the business end of things is a vapor and does not do the job~ there are insulation kits if you can spot where this may be occurring~

1 out of 1 people think this is helpful.
judge_roy
Not Active

http://www.amazon.com/s/? ie=UTF8&keywords=fuel+line+insulation&tag=googhydr- 20&index=aps&hvadid=24984234031&hvpos=1t3&hvexid=&hvnetw=g&hvra nd=14557161201540519936&hvpone=&hvptwo=&hvqmt=b&hvdev=c&ref=p d_sl_74ptvyun7v_b

judge_roy
Not Active

see if you can spot where the fuel line comes close to the manifold/exhaust system...use a lazer thermo-spot gun (they are about 14 bucks [and kitties are crazy about 'em] just search on this and you'll find many choices...these are useful for pointin' at a radiator to find the hot spots...to find thermal leakages...use mine every day~

judge_roy
Not Active

the engine will turn over? wrawwrawwraw? or click and thud? you know the starter motor is sensitive to heat too...if nuthin' at all would check the startermotor~

PorscheJim
245

I had an older Porsche that did the same thing. I finally traced it to the plastic "intake housing" from the air filter to the engine. There are sensors inside this to measure your airflow. My intake chamber housing had a tiny crack in it. "False air" was getting sucked into this crack and it would throw off the sensor readings. Your model being a 2008 could have this problem as it it now 5 years old. The plastic might be cracked on the underside close to the heat from the engine and you can't see the crack without removing this piece. My car would start great and run to get me where I was going, but as soon as the engine would warm up the car would not start again until it cooled off.

2 out of 2 people think this is helpful.
Best Answer
jcozmo
0

I have a 2008 porsche cayenne s and it is doing exactly the same thing. Has anybody found a solution?

PorscheJim
245

Check your fit of all the parts from air intake to filter box to plenum at the fuel injection throttle body. It sounds like a sensor is getting readings of "false air" from an air leak. I had this same problem on a Porsche many years ago. I finally found a small crack under (not visible from above) the plastic air tube going into the filter box.

Your Answer

Related Questions

Cayenne
Looking for a Used Cayenne in your area?
CarGurus has 3,454 nationwide Cayenne listings starting at $8,997.
ZIP:

Search Porsche Cayenne Questions

Porsche Cayenne Experts

#1 Uwin
Uwin
Reputation 100
#2 Tom Demyan
Tom Demyan
Reputation 90
#3 Smitty22
Smitty22
Reputation 50
View All

Related Models For Sale

Used Porsche 911"
106 Great Deals out of 3,348 listings starting at $12,975
Used BMW X5"
370 Great Deals out of 8,271 listings starting at $3,500
Used Porsche Cayman"
22 Great Deals out of 784 listings starting at $19,900
Used Land Rover Range Rover"
106 Great Deals out of 2,310 listings starting at $2,988
Used Mercedes-Benz M-Class"
363 Great Deals out of 8,170 listings starting at $1,494
Used Land Rover Range Rover Sport"
145 Great Deals out of 2,719 listings starting at $15,000
Used Audi Q7"
69 Great Deals out of 3,292 listings starting at $10,500
Used Porsche Boxster"
61 Great Deals out of 1,719 listings starting at $5,995
Used Mercedes-Benz S-Class"
296 Great Deals out of 6,790 listings starting at $2,647
Used Mercedes-Benz E-Class"
857 Great Deals out of 18,696 listings starting at $1,200
Used BMW 7 Series"
187 Great Deals out of 5,453 listings starting at $2,950
Used BMW 5 Series"
684 Great Deals out of 17,208 listings starting at $1,500
Used BMW X6"
36 Great Deals out of 997 listings starting at $29,800

Used Cars For Sale

2014 Porsche Cayenne S For Sale
194 listings starting at $69,493
2013 Porsche Cayenne S For Sale
26 listings starting at $65,883
2012 Porsche Cayenne S For Sale
45 listings starting at $46,399
2011 Porsche Cayenne S For Sale
5 Great Deals out of 70 listings starting at $41,499
2010 Porsche Cayenne S For Sale
10 listings starting at $28,991