DB9 Misfiring tried cleaning throttle bodies code p1797 HELP
Discussion
Hi all. I read the tutorial by Rick last week to clean the throttle bodies because I have been having a hesitating feeling on my 2006 db9 and rough idle mostly occurring in top gear from 1000-2500 rpm. I found the throttle bodies full of oily residue along with the intake pipes. After disconnecting the plugs and replugging on the throttles, I noticed the car was not running right. I disconnected the battery and all seems well for now. I was able to pull code p1797 and reset the engine light after it stalled out.
The car has 56000 miles I do not see any misfire codes.
Any ideas? Was I supposed to disconnect battery prior to removing throttle body connections?
Thank you in advance!!
The car has 56000 miles I do not see any misfire codes.
Any ideas? Was I supposed to disconnect battery prior to removing throttle body connections?
Thank you in advance!!
Rick, thank you very much for your response. It helped to explain things quite well. It is nice to see you have a passion for these cars!
On a good note no more check engine light, but the car still seems to have a lurching misfiring feeling to it at low rpm. Every few seconds at idle it has a shake and in top gear at around 40-50 mph it lugs if you try to accelerate, almost as if it is surging.
I think since I am in the US the next step will be a dealer, since I don't have the diagnostic computer AMDS.
On a good note no more check engine light, but the car still seems to have a lurching misfiring feeling to it at low rpm. Every few seconds at idle it has a shake and in top gear at around 40-50 mph it lugs if you try to accelerate, almost as if it is surging.
I think since I am in the US the next step will be a dealer, since I don't have the diagnostic computer AMDS.
Hi, and thank you again for the reply Rick! I am experienced with motor vehicles and perform all the maintinence to the other vehicles I have had, mostly BMW and Mercedes. I have used the generic obd2 equipment, all the 02 sensor voltages looked normal.
I could not get a read out on any mis fire codes however, yet the problem persists. It only happens hot, after the car has been run for at least 20 minutes. The exhaust feels smooth on both sides, however I noticed that the left bank of the engine has alot more oil in the intake tract (I noticed it was very wet while cleaning the throttle bodies). The brake pedal seems the same so I feel there is no vaccum leak at this time. The idle does not seem to hunt or race, it just occasionally shakes. The main issue is the surging while giving it throttle at low rpms, anything above 3000 rpm and it runs without issue.
The fuel consumption has gone up slightly since this has been happening but this could be from me driving with more gas in attempts to getting the engine to rev quicker.
I could not get a read out on any mis fire codes however, yet the problem persists. It only happens hot, after the car has been run for at least 20 minutes. The exhaust feels smooth on both sides, however I noticed that the left bank of the engine has alot more oil in the intake tract (I noticed it was very wet while cleaning the throttle bodies). The brake pedal seems the same so I feel there is no vaccum leak at this time. The idle does not seem to hunt or race, it just occasionally shakes. The main issue is the surging while giving it throttle at low rpms, anything above 3000 rpm and it runs without issue.
The fuel consumption has gone up slightly since this has been happening but this could be from me driving with more gas in attempts to getting the engine to rev quicker.
Update:
The car still has no check engine light. The right side exhaust has a popping feel to it every 5-6 seconds. There seems to be a heavy amount of oil in the right side pcv lines which run through the throttle body as well.
I am wondering if this excessive oil in the intake tract caused the plugs to prematurely fail. The vibration is not very noticeable at idle, at this point I have been advised by the dealer to replace all plugs, coils and pcv valves which make sense.
The car still has no check engine light. The right side exhaust has a popping feel to it every 5-6 seconds. There seems to be a heavy amount of oil in the right side pcv lines which run through the throttle body as well.
I am wondering if this excessive oil in the intake tract caused the plugs to prematurely fail. The vibration is not very noticeable at idle, at this point I have been advised by the dealer to replace all plugs, coils and pcv valves which make sense.
Gassing Station | Aston Martin | Top of Page | What's New | My Stuff