Had replaced original 30 k plugs with platinum plugs . now engine runs rough and obd ii code reader has 3 codes -random/misfire, #3-misfire, #4 misfire, what is sequence of cylinders. does each igniter have specific cylinder ? i have factory repair manual and cannot find these solutions.
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Re: replace spark plugs with plat core plug
Platinum plugs are NOT recommended for the Echo. The heat ranges are different. Put the right plugs in it (buy them from a Toyota dealer) and see if your problem vanishes. I get this quite a bit, customers put in new plugs, and it runs worse than it did before they changed the plugs. Note that ALL Toyota engines have a specific plug engineered for each engine. Platinums do not work unless the engine was designed for it. Same with iridium and NO Toyota runs well on the "split fire" plugs. If the problem persidts, change the coils around, see if the misfire "moves" to a new location, and you get a DTC P-0300, P-0301 and P-0302. If so, your coil pack may have failed, BUT, do the plugs first.
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Feb 5, 2010 - Uploaded by Scotty Kilmer
Scotty Kilmer, mechanic for the last 46 years and counting, shows how to fix your car if the check engine light ...
Ignition Coil "A" Circuit Primary/Secondary Malfunction
Our emissions expert has put together the following information about the P0351 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code. OBD II Fault Code
OBD II P0351 Ignition Coil "A" Circuit Primary/Secondary Malfunction
What does this mean? The ignition coil or coils are responsible for igniting the air/fuel mixture inside the combustion chambers. Without reliable performance from the ignition coil(s) the vehicle will stumble and misfire.
Code P0351 indicates there's an electrical problem in either the primary ( the computer side ) or the secondary ( the spark plug side ) of the Ignition Coil "A" Circuit. Symptoms
Check Engine Light will illuminate
Engine idles rough
Engine misfires on acceleration
In rare cases, the engine may not exhibit noticeable symptoms
Common Problems That Trigger the P0351 Code
Defective Ignition Coil(s)
Defective Spark Plug(s)
Intake Manifold Vacuum leaks
Carbon buildup in the Throttle Body air passages
Defective Idle Air Control Valve or Electronic Body
Ignition coil(s) replaced when cause of the malfunction was a vacuum leak
Spark Plugs replaced when cause of the malfunction was a vacuum leak
Check the firing order with the firing order diagram that I have uploaded, and if that does not solve the problem then remove the spark plugs and be certain that there is an even spark plug gap between all of the spark plugs, (see the emission label under the hood for the correct spark plug gap) and be certain that there is not any split-fire or multi-fire spark plugs installed in the engine, because those plugs will not work with an OBD-II system, and a random mis-fire is the least that they will cause if installed in an OBD-II controlled vehicle.
I have changed plugs using the platinum plugs and the problem don't go away. These plugs can make a car run worse in some cases. I have found it best to use the OEM or a step above on 4 cylin and 6 cylin engines. The Plats work fine in 8 cylin engines. You could also have a bad plug wire. The plug wire could be jumping spark. At night, open the hood, start the car with lights off. Look around the plug wires for sparks jumping. If a wire is bad, the spark is leaving the wire and grounding itself to the nearest metal causing rough engine idle and misfire.
You should be seeing a check engine light on in your dash. Have someone with a OBD II reader plug in and pull any codes.
I would suspect the rough idle may have to do with many things, vehicle needs tune-up, spark plugs , wires, ect. The fuel filter need to be replaced.
These are just a few of the more simple possible remedy's.
Please let me know what you find
If the engine seems to run fine over 1450 RPM maybe there is a vacuum hose leaking or EGR valve is slightly stuck open. Any help from the OBD II trouble codes? Or is there simply no MIL and no stored information in the OBD II computer read at the local parts store through the connector by the drivers knee?
most likey cracked or broken plug or crossed wires. get some chicken pliers (plastic from home depot elec department) pull wires one by one to locate after you figure it out go to auto zone & they will clear code maybe loan you tool they offer that