Stalling when braking
Thread Starter
Member
Posts like a V-Tak
Joined: Feb 2004
Posts: 71
Likes: 0
From: Upstate New York
Stalling when braking
The good news - my Bonneville did an 8000 mile cross country trip no problem.
The bad news, she recently started giving me stalling problems. It started as throwing a code stating that I had a hose cracked, cracked UIM, or bad MAF, etc. The UIM is dorman (full change out, blah blah), checked the torque and for cracks - negative. Checked all hoses - negative. MAF under microscope -negative.
Since... the car has been starting up and idling rough usually, either increasing the rpm automatically or by me, until it settles down to a good idle. When driving down the road or highway speeds, the car is perfect. When I begin to brake the rpms drop to almost stall, recover, and repeat (oscillate) until it usually stalls out. Starts again with usually no problem (until the next stop light).
-Doesn't matter if engine is hot or cold
-Intermitent - does not do it all the time, but is usually frequent when does
-Braking slower or shifting into neutral seems to have some positive effect (keep from stalling)
-Sounds like a hose issue I know, but meticulously checked.
Thoughts?
The bad news, she recently started giving me stalling problems. It started as throwing a code stating that I had a hose cracked, cracked UIM, or bad MAF, etc. The UIM is dorman (full change out, blah blah), checked the torque and for cracks - negative. Checked all hoses - negative. MAF under microscope -negative.
Since... the car has been starting up and idling rough usually, either increasing the rpm automatically or by me, until it settles down to a good idle. When driving down the road or highway speeds, the car is perfect. When I begin to brake the rpms drop to almost stall, recover, and repeat (oscillate) until it usually stalls out. Starts again with usually no problem (until the next stop light).
-Doesn't matter if engine is hot or cold
-Intermitent - does not do it all the time, but is usually frequent when does
-Braking slower or shifting into neutral seems to have some positive effect (keep from stalling)
-Sounds like a hose issue I know, but meticulously checked.
Thoughts?
Junior Member
Joined: Aug 2005
Posts: 0
Likes: 2
Have you tried cleaning your MAF?
Also check out your TPS. (Throttle Position Sensor) There is a write up here in the tech info for testing it.
You may also have a slow responding IAC (Idle Air Control Valve) some may tell you to try to clean this but really the only fix for this sensor is to replace it.
Also check out your TPS. (Throttle Position Sensor) There is a write up here in the tech info for testing it.
You may also have a slow responding IAC (Idle Air Control Valve) some may tell you to try to clean this but really the only fix for this sensor is to replace it.
Thread
Thread Starter
Forum
Replies
Last Post