Just had a friend do a tune up on car, it runs great, but engine light is on, we found that he must have broke some sensor of that is hooked to the cooling system, cause when he held it back on, the check engine light went off, but the thing is broke, how can we replace it,
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Re: cooling system sensor
There are two remove the broken one with a deep well socket take it to the auto parts store and buy a new one as I said there are two and one is expensive and send information to the computer so pull the broken on to get the right one.
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There are four relays for the cooling fans .low speed control , medium speed , high speed fan control relay 2 , high speed fan control relay 1, there is also a engine cooling fan resistor .The engine coolant temp. sensor would most likely cause the check engine light to be on . There is also a dual pressure switch , this is for the A/C . The cooling fans will be turned on at 213 degress low speed , high speed at 226 degress . If you had factory scan tool or a professional type you could view coolant temp data in pcm , you could also energize the relays to see if the system is operating normally . There are other repair shops beside dealers
new exhaust is to much for computer to figure out, since its flowing a lot more air , engine management cannot figure out fuel ratio hence the o2 sensor and knock sensor. u will have to install a performance chip or have computer re figured for new settings.
Check engine light means emissions control system problem. Who came up with the fault code. These codes are kind of specific and usually indicate which sensor or component has failed. If you didn't, have Mazda check it out. The only way to permanently clear the light is to replace the defective part. Don't advise driving too long with it on, could cause damage.
YES!!, you had it tuned, it runs good, but gas mileage dropped, and check engine light is on,it sounds like the o2 sensors are slow or even dead, i would replace them for sure and that just might solve all your problems,good luck, hope this helps.
I had an 88 that did something like that, it would idle up and down it seemed to be worse when the engine was cold. It turned out to be the MAP sensor, I never did get a check engine light. A friend of mine had the same truck and we swaped sensors back and forth until we found the problem.
Cooling Fan Temp Sensor is the First thing You Check (with what you have described) Cooling Fan Should ALways come On When The A/C is turned On as A/C Adds A Load to Engine, If Temp Sensor is Faulty it Will Not Give GROUND Signal to ECM >For COOLING FAN >RELAY to Give ground and turn ON The Fan.
There ARE 2 temp Sensors that Serve Different Purposes 1 is for Dash READING GAGE & Or TEMP LIGHT the Other is For ECM or Fan Relay (SAME Thing) you Said>""can disconnect the sensor and fan continues to run" < This Leads me to think you Changed the Wrong One. Not Questioning your Skills Just Here to Help.
TEMP SENSOR FOR 3.1L V6 is Located upper RH rear of engine compartment, near exhaust system. Temp SENSOR for 2.3L Engine is Located in LH rear of engine compartment. I Hope this Helps Lead you to a NON-OVERHEATING Pontiac.
Good Luck and Have A Great Evening. rejakwilson
The anti-lock brake system is not working. Ergo, both lights of brake and ABS will stay lit until you take it to you Dodge dealership and have them check you brake system. One of these days you will not be able to brake due to the failure, no matter if it runs great or not. Check engine, probably spark plugs misfiring, needing a tune-up, or maybe an oxygen sensor from the exhaust system not reading or working correctly.