Check engine light flashing in

[Andrew castaneda]

I have a 2000 gmc Ciara a shop just got done cleaning the fuel injectors why is the check engine light flashing now

Edited November 19, 2018 by Andrew castaneda

[Brian715]

Flashing engine light usually indicates major misfire. You can get the codes read at AutoZone or Oriellys for free and we can better help knowing the code numbers that are being set.

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[Rick2500]

Mine was flashing too and running like hell till I got it scanned and they told me I had a misfire on cylinder #4. Swapped the coil and went back to normal and gain the horsepower back. 

[dtnel78]

IF you get it scanned and they say it's a misfire and you need a coil, before you lay down your hard earned money for a coil check the spark plugs, spark plug wires. IF those are good switch the coil pack with a known good cylinder. Example if they say #3 cylinder has misfire then swap the #3 and #5 coil pack and after swapping it clear codes, check for flashing light again. IF the light is flashing then check the code and if the cylinder you moved the coil pack to is now misfiring then I'd be safe to say you have a bad coil pack. Normally I'd advise testing it with a lab scope as I believe each part should be verified bad and the replacement verified working properly as you don't want to do the "Parts Cannon" which is just throwing parts at it. A lot of inexperienced and even experienced mechanics do this and it's not good for the industry. Also if you replace a part that's good and it fixes something it could be temporary as the weak failed part may be causing further failures.

LEt us know what you find.

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