2002 v-12 DB7 won't accelerate. Drives like it is in Limp home mode. Both exhausts are hot. OBD code P0136, P1131 and P0300 flash on and off. Can't get the car above 40 MPH. Drove fine last time I had it out and then sat in garage for about a month due to clod weather.

 

Maybe some condensation water in the gas caused the misfire due to the extreme temperature swings.

 

Can you check your fuel trims? P1131 looks like it indicates a lean condition. P0136 may be an O2 sensor problem, or could also be a lean condition.

If long term trims are high, I'd start by looking for vacuum leaks, and fuel pressure (Does DB7 have 2 fuel pumps and 2 totally separate ECUs? That'll make diagnosis way more fun...)

I found this diagnostic manual that may also help.

http://astonmartindb7vantage.e-monsi...ecv-manual.pdf

Matt

 

Matt, Thanks for the OBDII codes. I haven't been able to get back to it and look at it but, hope to this weekend. When I last pulled it out it felt like only 6 of the 12 cylinders were accelerating. It would barely accelerate and topped out at about 40 mph. The check engine light flashed on and off multiple times and then went out. The codes I posted were the codes that were in memory. Both exhausts were putting out warm air. The left bank seemed to be a little more robust than the right. When I can recruit some help I will check to see if the exhaust is equal on both sides when at higher RPM's. I haven't checked the fuel system pressure to each rail yet but, I think that will be my first step. I checked the fuel pressure regulators and there wasn't any fuel in the vacuum lines. I tried to look at the hoses for cracks but, the Brits make that a pretty difficult task.