Rough running 986 Boxster S
Discussion
First post in this section, so bear with me, don't know that much about Porsches, just trying to help a friend out.
Symptoms are as follows: Since late summer the car has had a rather high idle rpm for a minute or two, and while on said high idle the throttle kind of sticks. But after a while the car settles down and works as normal.
Now when he started the car up prior to sell it, the same thing happens at first, car idles high and settles down after about a minute, Then he tried to rev it slightly to get it up to temp and let the fluids warm up and the car doesn't want to take the throttle, it splutters, mis-fires and runs very rough and un-even in general on throttle, but idles perfect.
It's also according to him rather weak, and always has been, drinks alot more fuel than it is supposed to and is no where near as fast top speed wise, a Boxster S should do close to 160 mph, and his is more or less dead above 130.
The car has 65000 miles on it, full PSH and is in very good nick otherwise.
Any takers?
Symptoms are as follows: Since late summer the car has had a rather high idle rpm for a minute or two, and while on said high idle the throttle kind of sticks. But after a while the car settles down and works as normal.
Now when he started the car up prior to sell it, the same thing happens at first, car idles high and settles down after about a minute, Then he tried to rev it slightly to get it up to temp and let the fluids warm up and the car doesn't want to take the throttle, it splutters, mis-fires and runs very rough and un-even in general on throttle, but idles perfect.
It's also according to him rather weak, and always has been, drinks alot more fuel than it is supposed to and is no where near as fast top speed wise, a Boxster S should do close to 160 mph, and his is more or less dead above 130.
The car has 65000 miles on it, full PSH and is in very good nick otherwise.
Any takers?
As a quick test before you get to read the codes unplug the MAF sensor and try the same tests you described earlier.
Generally the MAF over reads; the DME fuels for the excess air and ends up overfuelling and bogging.
Worth also mentioning that debris in the airbox can give the same symptoms - remove the filter and have a good look in the airbox and clear out any leaves/ debris (easily missed at service; debris is pushed off the dirty side of the filter and drops into the clean side).
Generally the MAF over reads; the DME fuels for the excess air and ends up overfuelling and bogging.
Worth also mentioning that debris in the airbox can give the same symptoms - remove the filter and have a good look in the airbox and clear out any leaves/ debris (easily missed at service; debris is pushed off the dirty side of the filter and drops into the clean side).
Edited by Pope on Wednesday 21st December 20:22
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