Engine Shaking Violently on Startup with blinking CEL - Toyota Celica Forum
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post #1 of 33 (permalink) Old 05-17-2014, 04:06 PM Thread Starter
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Default Engine Shaking Violently on Startup with blinking CEL

I have a 2000 Toyota Celica GT and the engine shakes quite a bit on startup (and the check engine light blinks) for a minute or two, but then everything is fine afterwards and the check engine light stays lit instead of blinking. If I turn off the car for an hour or two and start it again, it will generally not shake (it only shakes when the engine hasn't been started in quite a few hours). What could be causing by this? The only recent codes I have are Random Cylinder Misfire, Misfire on Cylinder 2, and Misfire on Cylinder 3. I've also had Cylinder 3 Coil Pack replaced a few months ago and the Fuel Injector on Cylinder 2 replaced about a month ago (my school works on cars and they said that is what the problem was at the time). I'm basically just trying to figure out what I need to attempt to look at next in an attempt to fix my car with 200k miles.

Please and thank you!
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post #2 of 33 (permalink) Old 05-18-2014, 09:33 AM
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It's most likely due to the misfires. You need to diagnose what the cause is. Here's a list of possibilities.
Faulty Spark plug or wire
Faulty Coil pack
Faulty Oxygen sensor(s)
Faulty Fuel Injector
Burned Exhaust valve
Fault Catalytic Converter
Poor Compression
Defective ECU.

I honk at other Celicas on the road.
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post #3 of 33 (permalink) Old 05-18-2014, 10:59 PM
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Have you ever cleaned your throttle body, or replaced your MAF?
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post #4 of 33 (permalink) Old 05-19-2014, 01:43 AM Thread Starter
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Originally Posted by Foxtherouge View Post
It's most likely due to the misfires. You need to diagnose what the cause is. Here's a list of possibilities.
Faulty Spark plug or wire
Faulty Coil pack
Faulty Oxygen sensor(s)
Faulty Fuel Injector
Burned Exhaust valve
Fault Catalytic Converter
Poor Compression
Defective ECU.
Thank you for a list of possible reasons!
I just recently replaced all of the Spark Plugs, which made my car feel a bit smoother when driving 70+ but didn't affect the startup shakiness. I have considered buying 3 new coil packs to replace the ones that haven't been replaced yet, just incase (on Ebay they're only like $80 for 4 of them). I also was considering changing the oxygen sensor's on my car... Is there a way for me to find out for sure which one of the problems would most likely be the "Main" cause? Would paying some place to Scan my car be able to determine something like that?
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post #5 of 33 (permalink) Old 05-19-2014, 01:53 AM Thread Starter
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Have you ever cleaned your throttle body, or replaced your MAF?
I have not cleaned my throttle body, if you mean literally with my hands or something (I'm not great with cars, but I am doing my best to learn). I seafoamed my car about 2 months ago, which cleans out quite a bit of crap, but do not know whether or not that affects the throttle body.

I have also not replaced my MAF. I've heard that cleaning it could help, but mine seemed pretty clean when I checked it approximately 8 months ago, so I didn't feel like I needed to buy the spray stuff to clean it or replace it.
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post #6 of 33 (permalink) Old 05-19-2014, 09:42 AM
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Is the ECU throwing any "P" codes?
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post #7 of 33 (permalink) Old 05-19-2014, 02:40 PM Thread Starter
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Is the ECU throwing any "P" codes?
My car has three codes currently.

P0300 - Random misfire
P0302 - Cylinder 2 misfire
P0303 - Cylinder 3 misfire
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post #8 of 33 (permalink) Old 05-19-2014, 02:46 PM
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I would first check your spark plugs, make sure that none of them are fouled or oil soaked. And replace any that are bad. Then see how the car reacts, if it's still shaking, I would then go ahead and test if any of your coil packs are bad.
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post #9 of 33 (permalink) Old 05-19-2014, 04:51 PM
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I'd replace all the coil packs at once just to be safe and make sure the new plugs are gaped correctly. Too much or too little gap can cause misfires.

I honk at other Celicas on the road.
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post #10 of 33 (permalink) Old 05-19-2014, 05:29 PM
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The reason that I said plugs first, is because you're talking about $400 bucks for all 4 coil packs. Makes more sense to start with the cheaper option first, and then cross your fingers.
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