Question about Pontiac Cars & Trucks
Check for a vacuum leaks use a air pressure gauge most come with instructions. It may be a failed gasket or airline. If it is a Vacuum leak usually the mechanic has to use a smoke machine to find it unless it is very obvious. Try plugging vacuum line for the power brakes if the car has a vacuum assisted brake instead of a hydraulic one. Sometimes the diaphragm fails in the power brakes unit or the seals leak. Remember when you test this there will be no brake assist and In some cars you have to stand on the brakes for the car to stop. .
Posted on Jan 02, 2014
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Posted on Jan 02, 2017
SOURCE: buick lesabre nightmare 2
Posted on Aug 01, 2008
SOURCE: car runs rough at idle
clean out ur throttle body, just follow the hose from the air filter to the throttle body. Need 2 people to do this. Don't remove the hose completely from the throttle body. Just enuff to be able to spray ur intake cleaner into the throttle body. Do this especially if its worse when the motor is hot, as this would confirm the problem.
Posted on Sep 04, 2008
I had a similar problem - took it into 'Nissan Professionals' and they changed everything you did as well, and had no luck. After 4 or 5 times working on it, they told me that it was a 'loose wire' that had to be re-soddered and then the problem was fixed. I don't know where the wire was, but they made it sound like it was in or around the fuse panel under the hood.
I hope this might shed some light on the problem.
Posted on Sep 14, 2010
Iwould check the fuel filter first thing it kind of sounds fuel related with the uphill power loss . the next thing to check would be the catayltic convertor with it running seewhat kind of exhuest flow is comeing out the tail pipe. But i think its more then likely its fuel related if it were the cat you wouldn't be getting mass air flow codes Do the fuel filter and when you have it off check to see what the fuel pump is putting out you should stick a plastic bottle on the end of the fuel line and crank the engine for 5 seconds it should fill it about a 1/3 give or take this is a 20 oz size bottle if its close its ok if its far less then its the pump However sometimes the pump will work fine one munite then stop then come back . Well i can't say for sure that this is the problem but it can't hurt to replace the fuel filter and check the pump hope this helps some
Posted on Jan 23, 2011
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Jul 12, 2017 | Buick Cars & Trucks
Limited throttle mode--The control module will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
Throttle default mode--The control module will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
Forced idle mode--The control module will perform the following actions:
Limit engine speed to idle by positioning throttle position, or by controlling fuel and spark if throttle is turned off.
Ignore accelerator pedal input.
Engine shutdown mode--The control module will disable fuel and de-energize the throttle actuator.
Powertrain Control Module Description for the 4.8L, 5.3L and 6.0L engine
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