2006 Toyota Camry Evil Missfire - Toyota Nation Forum : Toyota Car and Truck Forums
Camry 5th & 6th Gen (2002-2006 & 2007-2011)/2nd Gen Solara (2004-2008) Toyota Camry Discussion for years 2002-2006 & 2007-2011, as well as Solara Discussion for years 2004-2008. Topics of discussion range from fuel economy, safety, modifications, performance all involving America's favorite family car, the Toyota Camry.

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post #1 of 19 Old 06-11-2019, 12:40 PM Thread Starter
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2006 Toyota Camry Evil Missfire

I have a 2006 toyota camry 2.4L, recently I was driving down the road and the engine began to run awful with a lack of power, and the check engine light started flashing. I limped the car home and plugged in my laptop, where I noticed that cylinder 3 was misfiring, As l noticed that the misfire would stop at higher rpms i thought it might be the basics so i replaced the spark plugs, fuel injectors, and coil packs. Nothing changed so I ran a compression check and the compression seems great. the car has 250,000 miles and i have no idea what the issue could possibly be at this point, I have attached the link for a video of me cold starting the engine, although the issue shows the most at low rpms.


the misfire is really evident when I put it in drive
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post #2 of 19 Old 06-11-2019, 12:58 PM
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Is this all happening on one tank of gas - meaning you have not refueled yet?

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post #3 of 19 Old 06-11-2019, 01:28 PM Thread Starter
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When the issue first started the car was low on gas, so i did recently fill it with fresh gas from a different station.....maybe residual gas?But if it was bad gas, why would it only misfire at low idle?

also only cylinder 3 is misfiring

Last edited by kbod; 06-11-2019 at 01:31 PM.
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post #4 of 19 Old 06-11-2019, 03:31 PM
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Check for a vacuum leak, then focus on the injector.

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post #5 of 19 Old 06-12-2019, 12:10 AM Thread Starter
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i have just done a visual inspection, and everything seems fine, i have yet to do a smoke test but i was wondering why cylinder 3 would be the only one missing if there was a vacuum leak
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post #6 of 19 Old 06-12-2019, 06:48 AM
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I suggest starting with the basic troubleshooting to ID root cause rather than just replacing stuff. You already did that without success so go back and check things methodically.
1. Visual inspection on wiring to coil and injector. Disconnect and reconnect both.
2. Swap the coil, injector and spark plug to different cylinders to see if misfire moves.
3. When swapping the coil, inspect the boot to make sure you don't have have any tracks indicating arcing. Make sure the spring is in the boot.
4. You say compression was good - were all the cylinders within 10% of one another? In spec?

It is normal that the misfire will be more pronounced when the engine is put under load (i.e. put in drive). Regarding the question about misfire at idle, it could very well also be happening at higher rpm but is less apparent.

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post #7 of 19 Old 06-12-2019, 09:39 AM
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I think the beauty of the 2AZ-FE is that there is only A vacuum line and I believe that leads to the brake vacuum booster. Otherwise the only other vacuum lines are all emissions related and in the rear under the rear cross-member. Much like what Buckaroo said, inspect the coils, swap the coils, swap the spark plugs, and checking compression.


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post #8 of 19 Old 06-12-2019, 01:03 PM Thread Starter
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I replaced the coils, and i moved over the coils. I also replaced the fuel injectors. I also replaced all four spark plugs. None of those worked, the wiring harness for the coils seems to be fine. The compression check came out just fine. The engine only sputters and misfires at cylinder 3 no matter what i move over. Also the misfire only happens when the rpm goes down.

could It be an engine? an ecu? maybe the timing chain?


when i plug in my tech stream laptop and rev the engine the cylinder 3 misfire count stays at 0

it only starts misfiring at cylinder 3 when the car is at low idle, also if i drive the car i does not have any power up hills and it hesitates at any speed
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post #9 of 19 Old 06-12-2019, 03:16 PM
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Make sure you have spark on 3 by physically checking its firing. Is your newly replaced injector firing(screwdriver on it with ear on the other end, listen for clicking). Spray non flammable on your intake at base(to head) for #3. It's there, keep looking. Pinch booster vacuum line, look for change in idle.

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post #10 of 19 Old 06-12-2019, 07:14 PM
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2009camry1 is on the right track. if not spark, then replace ecm as it's about the only thing you've not replaced and the driver inside the ecm is responsible for firing the plugs.
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post #11 of 19 Old 06-12-2019, 10:43 PM Thread Starter
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At this point I honestly think my title "evil misfire" is true, i just went through the messy job of replacing the intake manifold gasket (that was fine), and it changed absolutely nothing, laptop only shows a code for cylinder 3 misfire, and when i go to live feed, it shows when idling that cylinder 3 is misfiring, but when the rpm goes up, it stops misfiring, i used the mechanics stethoscope to determine that the fuel injectors were doing just fine.... so at this point the car has new injectors, new ignition coils, new spark plugs, and a new intake manifold gasket.

whats left to replace?

I would think its a fuel pump but it only happens at idle, not high rpm, which is the exact opposite of what it would do had the fuel pump been bad.

probably ecm?
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post #12 of 19 Old 06-13-2019, 08:28 PM
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You may remove the valve cover and see how the valve springs look - focus on the intake valves for the #3 cylinder. See if those are wonky. Maybe try moving a fuel injector wire over, meaning swap #2 to #3 if it can reach, see if the problem moves.

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post #13 of 19 Old 06-14-2019, 04:52 PM Thread Starter
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fuel injector wire swap didnt do anything, and the valves look fine
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post #14 of 19 Old 06-14-2019, 08:17 PM
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Quote:
Originally Posted by kbod View Post
fuel injector wire swap didnt do anything, and the valves look fine
Yeah, so if the exhaust valves aren't actuated , you'll still show compression. Partially plugged exhaust would be readily remedied by pulling the upstream o2 at manifold(vac gauge should snap back on throttle goose without pulling o2). If it's the pcm, there would be a symptom at the dead cylinder.

This is gettin' ugly now.

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post #15 of 19 Old 06-14-2019, 08:22 PM
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Most things I have read indicate a misfire at low idle is typically an intake leak issue: the manifold has issues, gasket, or the intake valve springs are shot and the valves not seating. Or, it is a bad fuel injector, maybe its wiring. If all those check out (still may be some valve spring issue, that is not as easy to Mark 1 eyeball it) then...dunno. More thinking.

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