Question about Pontiac Montana SV6
The tach is connected to the coil,on the ignition side.I would check the connections at the battery,and make sure they are shiny clean,no black film on them.Then check the voltage at the battery,while the engine is running,it should be 13.65 to 14.25 volts output.If it is lower than this,with the head lights on,and ac fan,on high,then replace the alternator.Even if the battery has good voltage and starts the car fine,there will not be enough voltage to run the engine properly.These problems,most of them,most likely are tied together,if all this checks out o k<then run a ground from the engine to the body,to assure the inside components are grounded good,then you may have to get onto the dash,and make sure there is a good ground on the components there.If all this looks good,and you have run the ground to the body,replace the ignition switch.
Posted on Nov 18, 2009
OK MY FIRST THOUGHT IS SHOOT IT.
BUT BULLETS ARE EXPENSIVE SO LETS TRY SOMETHING CHEAP START AT THE BATTERY AND CHECK THE QUALITY OF EVERY GROUND POINT YOU CAN FIND (INSIDE THE CAB TOO)
A POOR GROUND CAN MAKE ELECTRONICS CRAZY.
Posted on Nov 18, 2009
Bcm is bad body controle module
Posted on Feb 11, 2013
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Posted on Jan 02, 2017
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Feb 12, 2015 | Cars & Trucks
Apr 22, 2017 | 1998 Chrysler Cirrus
The wiring diagram shows the wiring color code, Power rating
and connector plug used. The wiring diagram explains the vehicle's electrical
connections with color code. It's a bit complicated to understand.
Apr 07, 2013 | 2001 Cadillac DeVille
How to check? An issue with oxygen sensors is
that they steadily lose effectiveness with age and they can under perform for
quite a while before they trigger an error code on the ECU. Ensure the connection to the oxygen sensor is
robust and clean. As the oxygen sensor
only works when hot (they have their own in-built heaters, hence two wires for heating and two wires for sensor operation) and so there is the danger of getting burnt by working on them so a
safe approach is to find the electrical connection on the wiring harness remote
from the oxygen sensor and to make voltage measurements there. Most garages have systems that can record the
amplitude and frequency of the voltage peaks being produced by the oxygen
sensor. A less sophisticated means to
get some impression of the oxygen sensor function is to use a moving coil
galvanometer type voltmeter (analogue needle on dial). Setting the voltage range to 1 volt and by
attaching the meter leads across the sensor wires it should be possible to see
the rhythmic pulsing and the voltage range of the operating sensor output. If no pulses are seen it could be either a
break in the wire or a fault with the sensor itself.
Your vehicle is about 10 years old and most oxygen sensors last about 10 years or 100,000 miles....check to see how easy they are to get at and what the price is for replacement before contemplating replacing them
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