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My 03 Yukon Denali XL some flashes the check Eng.

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light then go away i...
my 03 Yukon Denali XL some flashes the check Eng. light then go away i only seen this happen twice in a year
Submitted: 7 years ago.Category: GM
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Answered in 3 minutes by:
8/10/2010
GM Mechanic: GM Tech (Cam), GMC Mechanic replied 7 years ago
GM Tech (Cam)
GM Tech (Cam), GMC Mechanic
Category: GM
Satisfied Customers: 29,591
Experience: GM Grand Master Technician 2007. 14 years experience.
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Greetings and Welcome to Just answer.

Does this happen when accelerating hard ot just random?

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Customer reply replied 7 years ago

NOT SURE HAVENT PAYED ATENTION WHEN IT HAPPENS . I ONLY REMEMBER ABOUT THIS PROBLEM WHEN I SEE IT FLASHING . ALSO SOME TIME AT A STOP TRUCK FEELS LIKE WANTS TO STALL.

GM Mechanic: GM Tech (Cam), GMC Mechanic replied 7 years ago

Ok, does the check engine light remain in solid all the time?

 

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Customer reply replied 7 years ago
ON IT FLASHS RAPPETLY
GM Mechanic: GM Tech (Cam), GMC Mechanic replied 7 years ago

OK, when was the last time you changed the fuel filter, change the plugs, clean the throttle plates and the Mass Air Flow Sensor at the air filter?

 

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Customer reply replied 7 years ago

recently changed fuel pump ,fuel filter (8 months) truck has a volant cold air intake, granatelli mass air sensor , bbk throttle body , ( oversize throttle body). also i just remembered some times when accelerating hard the light comes on solid only happen about three times i cant recall the code some thing like air mixture or fuel mixture i cant recall

GM Mechanic: GM Tech (Cam), GMC Mechanic replied 7 years ago

IS the air filter one that you put oil on?

 

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Customer reply replied 7 years ago
yes and my plug are denso iridium
GM Mechanic: GM Tech (Cam), GMC Mechanic replied 7 years ago
Ok, clean the Mass Air Flow Sensor with carb cleaner. The oil coats the sensor and can make the sensor read wrong.
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Customer reply replied 7 years ago
how about this denso plug i read on other post bosh plug where not good for gm ?
Customer reply replied 7 years ago
i heard that flashing Eng. light is bad they say stop driving car when it comes on
GM Mechanic: GM Tech (Cam), GMC Mechanic replied 7 years ago

Sorry, it was supper time.

Teh Bosch is not a good plug.. You are better to use a NGK or AC Delco.

Flashing check engine light is causing damage to the converters so if it is flashing, then you should not drive it.

 

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Customer reply replied 7 years ago
so denso plug are OK ? the flashing Eng. light I've only seen come on twice or maybe three times doesn't stay on it goes away what could that be?
GM Mechanic: GM Tech (Cam), GMC Mechanic replied 7 years ago

There is a misfire that is happening to cause the flashing light. It could be from the oil on the sensor, it could be something in the injector, intake leaking or anything like that. If all the things I suggest don't work, then you need to use the scan tool to see what cylinder is leaking.

 

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Customer reply replied 7 years ago

am cleaning out the air filter cleaning mass air with carb cleaner. how do i check for something in the injector, intake leaks ?

GM Mechanic: GM Tech (Cam), GMC Mechanic replied 7 years ago
Spray carb cleaner around the intake with it running to see if there is a difference in the way the engine runs. Injector leaks need a flow test to check them.
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Customer reply replied 7 years ago
Injector leaks need a flow test to check them. only shop can do a flow test ? or is it something i can do ? if so how do i test and what am i looking for
GM Mechanic: GM Tech (Cam), GMC Mechanic replied 7 years ago

the tools required are in a shop and not worth spending the money for one test.

 

GM Tech (Cam)
GM Tech (Cam), GMC Mechanic
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Satisfied Customers: 29,591
Experience: GM Grand Master Technician 2007. 14 years experience.
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Customer reply replied 7 years ago
today when turn on suv it was shacky like wanted to shut off the check eng. light came on drove the suv from work to my home put a scanner to it . code po200, and po300.came out . havent use suv for about a week i dont if that has something to do with it.
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GM Tech (Cam)
GM Tech (Cam)
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