Question about GMC Jimmy
Hi. This black smoke will be the result of a failed O2 sensor. It could be bank 1 or 2. I would recommend to run a diagnostic scan, if not done so already. The scan will isolate the affected sensor, and confirm the issue, as well. This issue will create back-pressure, which will choke out your cylinders and destroy your catalytic converter if the affected deices are not replaced soon. If you smell a rotten egg like odor coming from the exhaust, this will confirm that the catalytic converter is damaged along with the O2 sensor(bank one or two).
This condition will also damage spark plugs, due to the back pressure created by this issue.
Although the O2 sensors and catalytic convert may be the actual culprits here, there are other locations that may cause this as well. I will list he other possible culprits below.
1 MAP sensor - This sensor could be faulty of disconnected. Replace if needed.(this will show on the diagnostic scan results if it is indeed damaged)
2 Coolant temperature sensor - Check the connectors at the sensor for splits of disconnections. This sensor will induce your symptoms as well, if damaged. This will show on the diagnostic scan, as well.(if damaged)
3. Canister Purge Valve - This is part of the emissions assembly. This valve, if damaged, will induce the symptoms you have described. Replace if needed.(This will show on the scan if damaged)
4. Fuel Injector Pressure Regulator - This is another fail point in this situation, as well. This device may be damaged. Replace if needed.
Posted on May 11, 2010
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Posted on Jan 02, 2017
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