My NA Auto Coupe has started idling at 500 rpm and has a stumble, it occassionally stalls and once restarted is OK for a while.
Throttle response has been slow and it is DEFINATELY low on power.

But the most disturbing part is it has twice now decided to accelarate from rest to 1500RPM the last time sending me into the back of the car in front, minimal damage but a worry.

Now it does have the Powerchip ECU ugrade exhaust cold air and all the rest but the dealer is mystified.

Any thoughts would be appreciated

 

have you scanned the ecu for a code? try the dealership for a more indepth scan tool

 

Nope havent scanned it . I have spoken to Powerchip and they say no problem with their product so Im guessing it is an ignition thing that is causing some type of limp mode.

I did change the CAI to a single pick up for a day to see if it made any difference, it didnt, but that could not cause issues anyway

Going back to see the dealer on Tuesday just means that I cant drive her prior to Philip Island.
Thanks for the thought

 

I know it sounds silly, but check your plug wire connections.

 

Done that nothing has moved got me beat until Tuesday I suppose Tnx

 

Pep Boys or similar will lend you a scantool for free. Plug it in and tell us what it says.

 

Maybe a MAF sensor, possibly a O2 sensor on the fritz.

 

I know you say you've checked your plug wire connections and they are firm.
Have you checked the plug wires and/or plugs to make sure they work.
Occasionally they just fail and you need a new set.
Check to see if you're getting juice to the plugs.
I've had plug wires in the past that appeared to be fine, however, the car wouldn't go over 6omph - turned out to be wires.

 

Idle at 500 rpm is normal it seems because that's what mine idles at. Have you checked the fuel filter or pump. Sounds like there may be a surge of some kind.

 

Try the code scanners, but you're going to probably need a full real-time OBD-II diagnostic while running the car (with something like OBD-Key)

The real important things you have to look at are the Exhaust AFRs and the Fuel Rail Pressure.

 

Thanks Guys, non Pep Boys down under checked with powerchip all OK there so booked into the dealer for surgery on Tuesday

 

how long have you had the powerchip ?

 

Had the powerchip 18 months set for 100 octance available from pumps here added probably 30+HP but lots more low down tourque.

Matched with cold air intakes (behind grill) and twin cat 3" exhaust.
Great performance with more to come trying to get a set of cams made to compliment .

 

Fixed
MAF was playing up all sorted

 

I had a thought that was what it was.

 

sound just like mine it was a vacuume leak.