DBW engine stuttering
#1
DBW engine stuttering
Hey guys, lately I've had some issues with engine stuttering. A few symptoms
1) Almost every time I come out of gear my RPMs drop to 800-900, the car shudders, and it jumps to 1200, then back to normal idle of 950-1000.
2) Very occasional stalling. (Similar to 1)
3) The car will just drop power. 1st, 2nd, 3rd gear, doesn't matter. Usually for not more than a tenth of a second, but can sometimes be for an entire second. It even happens in cruise control. I recorded it to demonstrate:
Update: recording of shuttering idle, and engine COMPLETELY unresponsive to throttle input:
Update 2: I realized that #3 almost ONLY occurs at 3600-3800 RPMS. I used to have a small rattly sound at this RPM, as well, but couldn't nail down what it was before it went away. It sounded like it only came from the passenger/exhaust side of the engine bay, and underneath, so we assumed it was a sort of resonance with the exhaust system.
Does anyone have any ideas? I swapped the spark plugs, cleaned the injectors, checked the Accelerator Pedal Position Sensor, but I'm not sure what's wrong.
Thanks in advance!
1) Almost every time I come out of gear my RPMs drop to 800-900, the car shudders, and it jumps to 1200, then back to normal idle of 950-1000.
2) Very occasional stalling. (Similar to 1)
3) The car will just drop power. 1st, 2nd, 3rd gear, doesn't matter. Usually for not more than a tenth of a second, but can sometimes be for an entire second. It even happens in cruise control. I recorded it to demonstrate:
Update: recording of shuttering idle, and engine COMPLETELY unresponsive to throttle input:
Update 2: I realized that #3 almost ONLY occurs at 3600-3800 RPMS. I used to have a small rattly sound at this RPM, as well, but couldn't nail down what it was before it went away. It sounded like it only came from the passenger/exhaust side of the engine bay, and underneath, so we assumed it was a sort of resonance with the exhaust system.
Does anyone have any ideas? I swapped the spark plugs, cleaned the injectors, checked the Accelerator Pedal Position Sensor, but I'm not sure what's wrong.
Thanks in advance!
#2
Any CEL codes?
#3
#4
#5
#6
Spark plugs are in good order? Try a MAP "whack?"
#7
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#8
What plugs? Torqued to 22-24 lb-ft? (Grasping at straws here.)
-- Chuck
-- Chuck
#9
Community Organizer
Unplug your battery for a little bit to reset your ecu. When you reconnect your battery and the car dips to a low idle do not give it any gas, it is a learning ECU and will correct itself on it's own. Drive the car around for a little bit, again do not give it as gas when the idle dips. If you've tried this and the problem persists, then try cleaning or replacing the IACV.
#10
Update: when recording the idle dropping low and stuttering, about halfway through the video the engine became completely unresponsive to the throttle for over 5 seconds. Then, and audible clunk is heard from the engine and throttle response is restored.
https://youtu.be/0O-DDwkQI4s
https://youtu.be/0O-DDwkQI4s