I have a 2002 chevy cavalier that when the rpm is between 1700 and 2000 going steady speed it will cut out then come right back have changed plugs and wires didn't do anything This problem is worse when it's hot and humid in the winter when it's cold it almost never does it even if it's snowing or raining. it's been doing this for 2 years but getting worse
Country: United StatesMake: Chevrolet
Hello, I'm Cam. Please include all the details about your issue so I can accurately advise you. I cannot see your vehicle so please be detailed.
When did you last change the fuel filter?
i think about 8 months ago
Is the check engine light on?
no lights are on
ok when you have theRPM higher, how does it do?
it does not if you take on the high way around 70 it hasn't done it it seems to do about 35 to 45 mph when you are just crusing along
Is this the ECOTEC engine or thethe standard 2.2L engine?
I would suspect a weak crank sensor or failing ignition module then.
why would it do it only when hot and humid I took it delware in a snow storm and it didn't do it and it could be pouring rain and if it's cold it won't do it
that was a XXX XXXX XXXXX
These parts are sensitive to heat so when you have it hot and humid, these are ideal conditions, raining or snow cool things down.
how would i check the sensor or ignition module to know witch it was
THe sensor is dirt cheap and you replace it.
The ignition module has the coil packs on it so start by checking the plug wires on the top. See if there is any corrosion on the posts,
Then take it off and have it tested.
In this engine it is under the back of the engine
if the post are corroted would the cause it .
That is normal with age and mileage and the fix is to replace the coil that has corrosion.
where is the sensor and how do you check the module by ohms or voltage
The sensor is beside the igntion and coil pack and there is no test you can do with the meter for power or ground in this situation that will tell us anything
what about checking the igintion module with a meter
Not possible, but most parts stores have a machine that can test it .
if i change the crank sensor and the igintion module checks ok and the problem dosn't go away would thier anything else
WE can look for loose connecitons to ground on the engine and the body, check the vacuum line to the fuel pressure regulator for signs of fuel in it.
i have gone through the connections and cleaned them if they were dirty
and the ground cables you removed and cleaned them all anyway?
yes i have that was one of the first things i tried
OK, the other things include the throttle sensor and fuel pump sensor.
fuel pump connector I mean. certain loads flex the body and can make or break a connection.
i know the fuel pump connector is ok i had to change the fuel pump last year it died was hoping that was the problem but when summer came the problem came back
how do i check the throttle sensor
Visual inspection and look for pins in the connector that seem loose.
could one of the coils and not the module be bad
yes, very possible.
is their a way to check them
The coils, for an issue like this it will mostly be corrosion but you can measure post to post for resistance and then on the underside the pin to pin. Compare the readings .
what should the reading be
I cannot find any so compare one coil to the othere.
ok now if i took this to a dealer would their computer be able to pin point the problem where it's intermittent and not always their
The only way that would be worth it is if they can drive it while the issue is happening otherwise they will say it left no codes and start playing swapnostics with parts and your money.
thats what i thought i guess you have answered my questions unless you can think of something else it might be
AT the moment nothing else is coming to mind.
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GM Grand Master Technician 2007. 11 years experience.