Question about 1993 Saturn SL

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Rpm too high

While driving, i turned on the cruise control set at 65 mph. tried to turn it off by putting on break and did not shut off. tried using cruise control off button and still would not stop. the rpm were between 2 and 3000.
shut car off for two minutes, turn back on and still rpm the same. had to drive with break on most of the way. parked, disconnected battery. after couple hours, reconnected battery, turn car on..seem to reset rpm, however, now i have no cruise control ability. after two days, rpm stall at 1000.
no hissing sound from any hose or otherwise.

has this happened to you?
any suggestion?
thank you in advance
dali

Posted by on

4 Suggested Answers

  • 186 Answers

SOURCE: the car stalls when in drive and if driven more than a hour it stalls at every red light

The trans pan is on top and when it is removed for leak repairs or valvebody service,there is a 10 way electrical connector that has to be removed held in place by a 7mm screw.If care wasn't taken when it was re-installed you very well could have those problems.Also they may have pinched a wire under the valve body cover(pan).Or they may have knocked the ground wire off your trans range switch.Most likey related to the pan repair.hope this helps

Posted on May 22, 2009

c17hydro
  • 2984 Answers

SOURCE: The RPM of Nissan Altima stays high when drive over 65 MPH.

No....the rpms differ from engine to engine and from manufacturer to manufacturer. RPM's are always higher at higher speeds.

Posted on Aug 25, 2009

Testimonial: "thank you very much"

  • 39 Answers

SOURCE: I have an 03 saturn

sounds like a throttle sensor fault do to the fact that the saturn vue doesnt idle at 500 normally its uaually between 600-800. i suggest getting it hooked to a diagnostic machine to find wat the codes are cause im sure it will be several.

Posted on Nov 15, 2009

Testimonial: "not too sure, since the idle speed is always constant, it may in fact be 750, anyway the shutdown occurrs at random times without relation to the idle"

SOURCE: my '97 saturn had a hard time shifting gears going

Sounds like a faulty throttle position sensor TPS. This is located on the outside of throttle body on the end of the throttle shaft. If there is no proper feedback of throttle position the ECu is unable to maintain a stable throttle and this in turn makes the gear change very erratic. It has three electrical connections. The device internally consists, most usually, of a curved carbon track with an electrical connection at both ends and a rotary contact slider that moves to a point on the curved carbon track determined by the amount that the throttle is open. The curved carbon track has a resistance associated with it so the voltage that is returned by the throttle contact tells the ECU the throttle position. When the throttle is closed the voltage is low (0 to 0.49 volts) and when fully open it is high (5 volts) The three electrical connections consist of the contact points at each end of the track and the middle connection is the sliding throttle contact. OK check that the wires are all where they should be. Put a volt meter on the connections and record the voltages. When the voltmeter is on the middle pin the voltage should vary evenly as the throttle is opened and closed: use the accelerator lever cam or, if you have remove the air filter piping, you can use your fingers on the throttle flap. If the voltages are uneven replace the TPS

Posted on May 10, 2010

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Where is the fuse for cruise control on a 2003 envoy


It is HVAC 1fuse #39 in the rear fuse block ,this powers the on/off switch for cruise control ! Fuse Block - Rear Beneath the left rear seat. What engine does it have ? 4.2 L or 5.3 l There is no vacuum involved in the operation of the cruise control ! Your vehicle has electronic throttle control .
Cruise control is a speed control system that maintains a desired vehicle speed under normal driving conditions at vehicle speeds above 40 km/h (25 mph). Steep grades may cause variations in the selected vehicle speeds.
The following are the main components of the Cruise Control System:
?€¢
The powertrain control module (PCM)


?€¢
The On/Off switch


?€¢
The Resume/Accel switch


?€¢
The Set/Coast switch


?€¢
The TCC brake switch


?€¢
The stop lamp switch


?€¢
The throttle actuator control (TAC) motor


?€¢
The vehicle speed sensor


Cruise Control Engaged
The cruise control system will engage and adjust the vehicle speed based on the activation of the following cruise control switches:
?€¢
On/Off


?€¢
Resume/Accel.


?€¢
Set/Coast

The cruise control switches are located on the multifunction/turn signal lever.
The powertrain control module (PCM) monitors the signal circuits of the cruise control switches in order to determine when to capture and maintain the selected vehicle speed. The PCM uses the throttle actuator control (TAC) module motor in order to control the vehicle speed. For further information on the TAC System, refer to Throttle Actuator Control (TAC) System Description in Engine Controls - 4.2 L.
Ignition positive voltage is supplied from the 10 ampere HVAC 1 fuse to the cruise control switch via the ignition 3 voltage circuit. When the normally open cruise control On/Off switch is turned On, the switch closes and the PCM detects a high signal voltage on the cruise control on switch signal circuit. When the normally open Set/Coast switch is pressed, the switch closes and the PCM detects a high signal voltage on the cruise control set/coast switch signal circuit. To engage the cruise control system, turn the On/Off switch On and momentarily press the Set/Coast switch. The PCM will confirm that the cruise control enable criteria has been achieved. The PCM will engage the cruise control system and record the selected vehicle speed. The PCM sends a class 2 message to the instrument panel cluster in order to illuminate the cruise control indicator. Pressing the accelerator pedal, while the cruise control system is engaged, will allow the driver to override the cruise control system in order to accelerate the vehicle beyond the current set vehicle speed. When the accelerator pedal is released, the vehicle will decelerate and resume the current set vehicle speed. The driver can also override the current set vehicle speed via the Set/Coast switch and the Resume/Accel switch. When the cruise control system is engaged, pressing and holding the Set/Coast switch will allow the vehicle to decelerate from the current set vehicle speed without deactivating the cruise control system. When the Set/Coast switch is released, the PCM will record the vehicle speed and maintain the vehicle speed as the new set vehicle speed. When the cruise control system is engaged, momentarily pressing the Set/Coast switch will allow the vehicle to decelerate at 1.6 km/h (1 mph) increments for each time that the Set/Coast is momentarily pressed, with a minimum vehicle speed of 37 km/h (23 mph). When the normally open Resume/Accel switch is activated, the switch closes and the PCM detects a high signal voltage on the cruise control resume/accel switch signal circuit. Activating and holding the Resume/Accel switch, when the cruise control system is engaged, will allow the vehicle to accelerate to a greater vehicle speed than the current set vehicle speed. When the Resume/Accel switch is released, the PCM will record the vehicle speed and maintain the vehicle speed as the new set vehicle speed. When the cruise control system is engaged, momentarily activating the Resume/Accel switch will allow the vehicle to accelerate at 1.6 km/h (1 mph) increments for each time that the Resume/Accel switch is momentarily activated, with the maximum acceleration total of 16 km/h (10 mph) over the current set vehicle speed . Momentarily activating the Resume/Accel switch, after the cruise control system has been disengaged by pressing the brake pedal, will recall the previous set vehicle speed that is recorded in the PCM.

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1 Answer

What does the MIL code "PO 320" mean, please?


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because the engine runs ok until it is on cruise control I would be investigating the RPM sensor for a fault
The cruise control takes its control from the RPM sensor and if that circuit is interminable the the cruise control doesn't know what rpms to maintain.

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The purpose of cruise control is just to maintain set engine RPM. Any thing else that effects the engine performance will only cause the cruise control to adjust to maintain the engine RPM or MPH that you set to.

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What is the function of the cruise control, and when should i use it.


the cruise control is for expressway or throughway driving or any open highway ,it cuts down on fuel by not useing so much gas. it stays at a constant speed it depends where it is set too. after cruise control is set, you can cancel it anytime by turning it off or putting on the brakes. most cruise controls will not set below 40 mph. this is a feature to keep from using it in the city, or populated area. hope this helps you ! good-day !

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Drive cycle


Here is the OBD2 emission system drive cycle test procedure.
Engine coolant temp must be below 70c (158f) before starting the engine for either the first or second trip
The fuel level should be less than 1/2 full
First trip:
Start engine, idle for at least 1.5 minutes
Drive 3 minutes, hold b/f schdl: 1.5-2.0 msec, selector lever "3rd" eng rpm 1,800-2,000 A/C switch:ON Hold the recommended b/f schdl range. Allow road speed to vary as necessary.
Drive at 55-65 mph for 1.5 min b/f schdl 2.0-3.2 msec, selector lever "5th" Engine rpm 2,200-3,000
IGN "off" for at least 10 seconds (not more than 5 min)
Dive at 50-60 mph for 3 minutes Selector lever "4th" keep engine speed above 3,000 rpm Allow speed to vary if necessary. Do not decelerate for more than 3 consecutive seconds. A/C switch ON.
Drive at a steady state cruise of 53-58mhp b/f schdl more than 1.8 msec selector lever "5th" eng rpm 2,400-2,600
Downshift to "4th" and decel more than 5 seconds without breaking, then idle for 1 minute.
Drive two minutes b/f schdl less than 2.0 msec Accelerate to 41 mph, decelerate to 34 mph, accelerate to 41mph. Do not completely release the accelerator. A/C switch off.
Idle 1 minute in park or neutral
Drive two minutes Steady state cruise at 31-44 mph. Selector lever "4th" A/C switch OFF. Hold the accelerator pedal as steady as possible. Allow speed to change if necessary.
End of first trip. Turn the key off the begin the second trip.
Second trip:
Start engine, idle for at least 1.5 minutes
Drive 3 minutes, hold b/f schdl: 1.5-2.0 msec, selector lever "3rd" eng rpm 1,800-2,000 A/C switch:ON Hold the recommended b/f schdl range. Allow road speed to vary as necessary.
Drive at 55-65 mph for 1.5 min b/f schdl 2.0-3.2 msec, selector lever "5th" Engine rpm 2,200-3,000
IGN "off" add four gallons of fuel
Dive at 50-60 mph for 3 minutes Selector lever "4th" keep engine speed above 3,000 rpm Allow speed to vary if necessary. Do not decelerate for more than 3 consecutive seconds. A/C switch ON.
Drive at a steady state cruise of 53-58mhp b/f schdl more than 1.8 msec selector lever "5th" eng rpm 2,400-2,600
Downshift to "4th" and decel more than 5 seconds without breaking, then idle for 1 minute.
Drive two minutes b/f schdl less than 2.0 msec Accelerate to 41 mph, decelerate to 34 mph, accelerate to 41mph. Do not completely release the accelerator. A/C switch off.
Idle 1 minute in park or neutral
Drive two minutes Steady state cruise at 31-44 mph. Selector lever "4th" A/C switch OFF. Hold the accelerator pedal as steady as possible. Allow speed to change if necessary. I especially like the part where they want you to add four gallons of fuel. Not three gallons, not five gallons, four gallons. Gotta love those Nissan engineers. ...and of course they state that if the trace is not followed exactly (i.e. you botch the acceleration/deceleration) you have to start all over again from scratch

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2 Answers

The RPM of Nissan Altima stays high when drive over 65 MPH.


No....the rpms differ from engine to engine and from manufacturer to manufacturer. RPM's are always higher at higher speeds.

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Stalls at low speed when in cruise control


You sould have recieved a "recall" notice in the mail about the cruise control for fire and failure issues. they are adding a fusable link where the cruise control harness connects to the brake master cylinder. if you have not had the recall performed yet you should SERIOUSLY consider getting it done, mainly so it doesnt catch fire, but "could" be the result of the failure you've been experiancing! btw, almost ALL Ford vehicles have been affected with the cruise control recall. hope this helps!

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1 Answer

The cruise control shuts off sometimes during use


Not sure, but your brake pedal might not be pushing the brake light switch back in. Next time it happens, stop somewhere safe, put the car in park and check the brake lights on the rear of the vehicle with nobody's foot on the brake pedal. If they're still on, try pulling the brake pedal up with your foot and check to see if the lights go off. If they are on then go off, you can usually adjust the brake switch closer to the pedal to put more pressure on it to get the lights to go off. If not, you might have to get a new switch. If that's not it, try wiggling the wires with it in park then take off again and see if it'll return to cruise control.

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