I have a 2003 Saturn Vue base 2.2 134cid. that i am experiencing trouble with, all is going fine for about 5mis. then suddenly I lose power and no acceleration even with my foot to the floor, engine surges and I experience a hard brake pedal, need to put into neutral to get power assist to work so i can stop the car, what could possibly be wrong, I'm guessing it has something to do with a vacuum leak somewhere?
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Re: loss of power and loss of vacuum to brakes
Restriction in the exhaust can cause this. Test with a vacuum gauge normal 60 mph readings around 14-18 hg. in depending on throttle position once power loss starts if reading goes to zero restriction is present. then use of a infra-red thermal heat gun you can locate the restriction. hot to cold at plugged stop.
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The electronics involved are unique to say the least .
The instrument panel cluster (IPC) displays the vehicle speed based on the information from the body control module (BCM). The engine control module (ECM) calculates the vehicle speed based on the controlled area network (CAN) serial data message indicating the wheel reference speed from the electronic brake control module (EBCM). The ECM sends a CAN serial data message to the BCM indicating the vehicle speed. The BCM sends a class 2 message to the IPC indicating the vehicle speed.
The speedometer defaults to 0 km/h (0 mph) when any of the following occur:
• The EBCM detects a malfunction in the vehicle speed sensor circuit.
• The ECM detects a loss of CAN communications with the EBCM.
• The BCM detects a loss of CAN communications with the ECM.
• The IPC detects a loss of class 2 communications with the BCM.
Is the ABS light lit ? Having the vehicle checked for DTC'S - diagnostic trouble codes would be the best first step to finding the problem . Could be a wheel speed sensor or ?????? .
Make sure the master cylinder is full and that the vacuum line going to it is is secure wit no air leaks. If as you state the brakes not being applied only at the drivers front and passengers rear wheels, but the other two wheels are working fine you will either have a leaking/blocked master cylinder, leaking/blocked brake lines feeding each of those wheels, or a bad proportioning valve. To trouble shoot raise the bad wheel and crack open the bleeder valve, have an assistant apply the brakes if a nice clean steady stream of fluid comes out, MC is OK, and valve is OK, any bubbles of poor flow indicates leak in system. Very little flow bad MC or blocked lines/valve, etc.Do the same for the rear wheel and you should be able to determine the fault.
If your engine is nearly stalling, you will also lose braking assist, because your vacuum drops off to nothing. The first thing to do is to get a diagnostic scan. There are several sensors that can cause this to happen. Your least expensive route is often to get it scanned before looking any deeper.
P1599 IS A STALLING ISSUE COULD BE BAD GAS / BAD FUELPUMP DIRTY FUEL FILTER
DISCONNECT BATTERY AND SEE IF THE LIGHT COMES ON AGAIN
U2107 HAS SOMETHING TO DO WITH THE COMPUTER LOOSING POWER AT THE BODY MOUNTS CHECK CABLES AND GROUND STRAP
i am a saturn tech and ive never heard of this concern,the columns do go bad but they just set a ses light and cut out power,the column could be bad,it could also be the intermediate shaft u joint binding,,,i rec take to dealer, could be serious
Yup. The throttle body connectors have a history of failing on these cars. Replace the throttle body and the wire connectors that go to it, and you're back in business. Not terribly difficult and you can get the parts from any dealer. Saturn actually has a bulletin out on this problem but they won't cover it unless you're under warranty - no recall for this.