Question about Pontiac Grand Prix

1 Answer

K i have replaced everthing including the ecm and all electronic sensors is there anything that could cause it not to run and low rpms when it does

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Pontiac Master
  • 17,970 Answers

Any fault code there? I know you stated the Check Engine Light is not on, but have you checked it for stored fault codes anyway? Many fault codes are type B and type C fault codes, which means they can set and not turn the light on. If you do have any, please let me know.

The reason i ask, is that its very common for the Crank Position sensor to fail in the 3.8L engines, especially of that year range. Sometimes, they will set a P0336 fault code, which usually isolates the Crank Sensor, however the lack of that code does not give the crank sensor a clean bill of health. I would still suspect it.

Usually, the best way to spot one, is to watch engine RPM while cranking. Sometimes that works for the Tachometer but some cars, the gauges don't work while cranking, so you may need to watch Engine RPM on the scantool while cranking. If it says 0 (or a number less than 20; sometimes the scanner will show like 4RPM without the car running). So basically no change in RPM from Key-On to cranking leads to a bad crank sensor.

Also, about your low RPM's, its possible that you have any problem with the Torque Converter, first, check level fluids and fine wokr of solenoids.

Tell us news.

Posted on Jul 08, 2010

  • 4 more comments 
  • micey72 Jul 08, 2010

    k the crank sensor i have replaced... and nothing in the computer at all (as far as fault codes stored or current

  • micey72 Jul 08, 2010

    could it be a tor sensor

  • micey72 Jul 08, 2010

    tcc sensor

  • ZJ Limited
    ZJ Limited Jul 08, 2010

    You probably have the 3-speed automatic
    transmission (125thm). This is most likely the torque converter clutch
    staying applied. The TCC solenoid inside the transmission is sticking
    on. There is a plug on the front side of the transmission that, if
    unplugged, will not allow the TCC to come on. You can dis-connect this
    plug to see if it still shuts off on you. If not, you need that solenoid
    replaced.



  • micey72 Jul 08, 2010

    could that be the problem considering it seems like a fuel issue that aspark issue than a combnation issue but nothin i have changed makes a differance...(tb cleaned, tps,coil packs, igmod, cat conv, egr, ecm, new intake gaskets ,cps, checked the timing and plugs wirers and pcv fulefilter, fuel pump and checked the wiring....) please help save from the junk yard

  • ZJ Limited
    ZJ Limited Jul 08, 2010

    I suggest check the fuel pressure, just cause there is fuel present, doesn't mean it
    has enough pressure to start/run (fuel pressure regulator possibility).

    Also, check the fuses, are they all good? If ok, need to find out what signals the injectors on, computer problem
    perhaps. Also can check this link about not the fault but did you change the DME relay with your spare
    or make the 3 wire? DME Relay Information and Testing

    Try it and comment.

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

How is ignition timing regulated? Car gets 99 BTDC on ignition timing and failed SMOG Test in CA. Listed as GROSS POLLUTER.


something wrong here
with 99 degrees btdc it will not run
have you got it on the correct plug lead
next the timing is regulated by centrifugal advance if electronic or points and by the crankshaft position sensor if ECM controlled ( some after market distributors that are used in place of points units have a small sensor in the distributor that can adjust the timing according to engine rpms, but it cannot make allowances for mixture and so they can advance the timing but not take into account anything else which sometimes results in detonation under certain throttle settings
so initial setting for most cars is 10-12 degrees btdc at idle and with engine rpms set up to 3000 rms it may advance to 25-30 degrees depending on the advance mechanisms
with ECM units the timing is controlled by the crank position sensor and is set to parameters according to engine rpms and air/fuel ratio settings but it still has a basic 10-12 degrees btdc on starting
to fail smog tests you probably do not have a working cat converter and other problems besides timing

Sep 15, 2016 | Cars & Trucks

1 Answer

Symptoms of bad distributor


a bad distributor indicates in several ways
misfiring on one particular cylinder --- cracked cap, carbon track diverting the current for the spark
multiple misfires -- corrosion in the HT leads receptacles
intermittent spark ---rotor button spring contact not touch carbon button in cap--replace cap
varying timing --- using a timing light , the timing varies between BTDC and AFTDC--- worn bushes in the body, worn shaft, bent shaft, excessive end float in the shaft
faulty advance plate connections---stuck or loose
if electronic --- exciter touching the pickup sensor( worn shaft/ bushes
without a make ,model year and control method (efi or electronic distributor) it is difficult to determine the cause of rough idling and the rpms variation
that can be from vacuum leaks, low fuel pressure , mixture adjustment if carby or mixture control if ECM
if EFI unit run the fault codes for pointers to the problem area

May 05, 2016 | Cars & Trucks

1 Answer

GDI. Why is there misfire and idle fluctuation?


code p 0300 determines misfire causes as the following=== causes --engine mechanical fault ---wiring---ignition/ fuel system---injector ---ECT/MAF sensor--- ECM
You have two areas to check
one is the MAF sensor as it will cause erratic idling and second the injector or HT leads to a plug
If you run the fault codes you will get a p 0301or 2 or3 or 4 code and that is the cylinder number that is misfiring--code p 0300 is random /multiple misfires and the causes are the same including low fuel pressure and low compression

Dec 17, 2015 | 2004 Mitsubishi Lancer

2 Answers

The engine light on my 2005 Mercedes E280 (petrol) comes on but the car starts, idles and runs perfectly. The code reader I have says that the camshaft timing on bank 1 is over-retarded. Could the sensor...


The code reading will be correct. the valve timing is altered by a hydraulic control that advances or retards the timing according to engine rpms as determined by the ECM. This adjustment is by an electronic solenoid controlled by the ecm. They are prone to failure in the solenoid or worn out cam adjuster
take the vehicle to an accredited service dealer or an accredited shop that specialises in your car and have it repaired/replaced

Jan 20, 2015 | Cars & Trucks

1 Answer

Idle issue when a/c is on


the ac compressor is controlled by the thermostat connected to the evaporator under the dash When the cab air temperature reaches the set temperature the ac compressor switches off . IT is called cycling. If it causing a problem with the engine rpms then there is a sensor problem not an ac problem so run the fault codes to determine where it is . ECM's are programmed to maintain constant rpm regardless of the load placed on the engine at idle.

Mar 23, 2014 | 2001 GMC Savana Cargo

2 Answers

1991 nissan maxima the car will run fine and just cut out i also noticed the tachometer will sometimes go 4000 rpms while stepping on gas pedal but the engine is missing and bairly running also i noticed...


Are you sure what you found is the temperature sensor? It sounds like it could be a faulty camshaft position sensor. That would explain the erratic idle and rpm spike. Will aslo cause the engine to skip because of the irregular signal being sent back to the ecm.

Mar 30, 2011 | 1991 Nissan Maxima

1 Answer

My car is showing PO344 (Camshaft Position Sensor A Circuit Intermittent) as a problem it's having... I replaced the camshaft sensor about 2 years ago when I was having a similar problem; could the sensor...


All ways, the camshaft position sensor signal sent to the ECM is intermittent

The Camshaft Position Sensor is an electronic device used in an engine to record the rate at which the camshaft is spinning. This information is used by the Powertrain Control Module (PCM) or Electronic Control Module(ECM) to control ignition and fuel injection. The camshaft position sensor senses the retraction of camshaft (intake) to identify a particular cylinder. The camshaft position sensor senses the piston position. The sensor system consists of a rotating part, typically a disc, as well as a static part, the actual sensor.

When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. The change in the magnetic field cause the voltage from the sensor to change.

When the crankshaft position sensor (POS) system becomes inoperative, the camshaft position sensor provides various controls of engine parts instead, utilizing timing of cylinder identification signals.

Check thos DTC diagnostic and possible solutions about P0344 - Camshaft Position Sensor Circuit Intermittent

Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of Power
- Engine Stall

Possible causes
- Harness or connectors (The sensor circuit is open or shorted)
- Camshaft position sensor may be faulty
- Camshaft (Intake) may be damage
- Starter motor may be faulty
- Starting system circuit
- Dead (Weak) battery

Possible solution
- Charge battery
- Repair harness or connector
- Replaced Camshaft Position Sensor.
Tech notes
- Sometimes and in some models, low battery voltage or a weak starter can can trigger a Camshaft Position Sensor code.


Hope this helps.

Mar 27, 2011 | Dodge Stratus Cars & Trucks

1 Answer

Speed and crankshaft sensors problem. Need to find location and how to replace this parts. Check engine light is on because of this problem.


Recall Number: 07V527000 Dates Manufactured: JAN 2004 to OCT 2006 Number of Vehicles Affected: 653910 Date Owners Notified On: DEC 2007 ON CERTAIN PASSENGER VEHICLES EQUIPPED WITH A 2.5L ENGINE, THE CRANKSHAFT POSITION SENSOR CAN OVERHEAT CAUSING A BRIEF INTERRUPTION IN THE SIGNAL OUTPUT FROM THE SENSOR. Consequence of Defect:
IF THE INTERRUPTION IN THE SIGNAL FROM THE CRANKSHAFT POSITION SENSOR IS SO BRIEF THAT THE ELECTRONIC CONTROL MODULE (ECM) LOGIC DOES NOT HAVE TIME TO DIAGNOSE THE CONDITION, THE ENGINE MAY STOP RUNNING WITHOUT WARNING WHILE THE VEHICLE IS DRIVEN AT A LOW SPEED INCREASING THE RISK OF A CRASH. Corrective Action:
DEALERS WILL REPROGRAM THE ECM FREE OF CHARGE. CERTAIN MY 2006 ALTIMAS WHICH HAVE BEEN PREVIOUSLY REMEDIED UNDER RECALL CAMPAIGN 06V223 (NISSAN R0606) ARE NOT INCLUDED IN THIS RECALL SINCE THE REPROGRAMMING FOR 06V223 ALSO INCLUDED THIS REPROGRAMMING. THE RECALL BEGAN ON DECEMBER 31, 2007. OWNERS MAY CONTACT NISSAN AT 1-800-647-7261.

Feb 01, 2011 | 2005 Nissan Altima

1 Answer

What is the 1987 pontiac fiero gt v6 check engine light code list?


CODE 12- NO DISTRIBUTOR REFERENCE PULSES ECM. CODE 13- OXYGEN CIRCUIT. CODE 14- COOLANT SENSOR HIGH TEMP CODE 15- COOLANT SENSOR LOW TEMP. CODE 21 - THROTTLE POSITION SENSOR VOLTAGE HIGH.CODE 22 - THROTTLE POSITION SENSOR VOLTAGE LOW.CODE - 23 MIXTURE CONTROL SOLENOID.FOR CARBURETOR ENGINE. CODE 24 -VECHICLE SPEED SENSOR. CODE 32 - BARO CIRCUIT LOW.CODE 32 - FUEL INJECTED EGR VALVE VACUUM SWITCH SHORTED TO GROUND.OR EGR VALVE SOLENOID CIRCUIT OPEN. CODE 33 - MAP SENSOR.CODE 34 - VACUUM SENSOR OR MAP SENSOR.CODE 35 - IDLE SPEED CONTROL. CODE 41 - EST CIRCUIT. CODE 42 - ELECTRONIC SPARK TIMING.CODE 43 - ELECTRONIC SPARK CONTROL UNIT. CODE 44 - LEAN EXHAUST.CODE 45 - RICH EXHAUST. CODE 51 - PROM OR MEM CAL.CODE 52 - CALPAK. CODE 53 -EGR VALVE CARBURETED ENGINE THE EGR VALVE VACUUM SENSOR HAS RECEIVED IMPROPER EGR VACUUM. CODE 54 - M C SOLENOID CARBURETED ENGINE MIXTURE CONTROL SOLENOID SHORTED OR FAULTY ECM.CODE 54- FUEL INJECTED ENGINE FUEL PUMP VOLTAGE IS LOW.CODE 55 - ECM MAKE SURE PCM GROUND CONNECTIONS ARE TIGHT.IF OKAY.REPLACE THE ECM.

Mar 27, 2010 | 1987 Pontiac Fiero

1 Answer

'93 4 cyl accord periodically won't start


that sure sounds like a voltage drop through the battery cables. could be a drop to the fuse box causing low voltage to engine sensors. i dont see the cam sensor causing your problem if jumper cables fix it. you need a multimeter with a min/max setting connected to both ends of one of the cables while cranking. anything over a half volt from one end to the other is too much and it would need replaced. do this on both pos. and neg. cable,including cable to fuse box. check batt. voltage while cranking. these fuel injected engines are very sensitive to voltage and if its too low to certain sensors it wont start. cam sensor controlls fuel injector timing via ecm, crank sensor controlls spark. it would be more helpful to me to know weather it is spark or fuel you aren't getting while cranking. hope i helped you and not caused you more questions. keep me up to date. dustang

May 09, 2009 | 1993 Honda Accord

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

39 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pontiac Experts

yadayada
yadayada

Level 3 Expert

74896 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7688 Answers

Are you a Pontiac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...