Question about 1996 Pontiac Grand Am
96 grand am 3.1 170.000 km . on humid days car misfires while driving and idle .Codes pointed to number 5 injector s electronic module (replaced). In warm dry weather it misfires less .spark plugs,wires,gas filter,tank,fuel pump battery new .starting the car in the morning results in a fluctuation of intensity from high to low repeatedly of all electric components (ligths head lights dash lights radio including the idle of engine thanks for all suggestions
I had a 94 that ran into problems like that with very rough idles and misses. i get about five different codes from injectors to oxygen sensor. turned out my negative wire from the battery was so corroded inside the insulation it was causing all sorts of problems. bought new cable and ends from canadian tire $40.00 and installed (had to clean the connection to the block with sand paper) but fixed all my problems after that.
Posted on Apr 17, 2009
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Posted on Jan 02, 2017
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This will help.
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1. Start the engine when the engine coolant
temperature gauge needle points to C. Allow
the engine to idle until the gauge needle
points between the C and H (normal operating
2. Accelerate the vehicle to 55 MPH (88
km/h), then quickly release the accelerator
pedal completely and keep it released for at
least 6 seconds.
3. Quickly depress the accelerator pedal for a
moment, then drive the vehicle at a speed
of 53 to 60 MPH (86 to 96 km/h) for at least
4. Stop the vehicle.
5. Accelerate the vehicle to 35 MPH (55 km/h)
and maintain the speed for 20 seconds.
6. Repeat steps 4 through 5 at least 3 times.
7. Accelerate the vehicle to 55 MPH (88 km/h)
and maintain the speed for at least 3 minutes.
8. Stop the vehicle and turn the engine off.
9. Repeat steps 1 through 8 at least one more
If step 1 through 7 is interrupted, repeat the
preceding step. Any safe driving mode is acceptable
between steps. Do not stop the engine
until step 7 is completed. If you cannot or
do not want to perform the driving pattern, a
NISSAN dealer can conduct it for you.
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