Have Toyota Questions? Ask a Mechanic for Answers ASAP
Hello my name is ***** ***** I will be assisting you with all of your vehicle questions today. Give me one moment while I review your question and come back with a answer. Please be aware I do not know your skill level or abilities so I will be asking a lot of questions and in a lot of cases we will respond to each other quite a lot before we find a solution. As far as phone calls are concerned that is the system prompting you, not me, and they do cost more money, I prefer text but in some cases a phone call is required.
Sounds like you have some bad coils
1. Verify good battery voltage to each ignition coil on the Black/Red wire at each coil.2. Verify the ground is good on the Brown wire at each coil - look for 0.05 volts or less.3. Scope the Ignition Trigger (IGT) signals to each coil when the engine is cold and compare to when hot when it acts up - look for clean consistent 0-5 volt square wave signals and see if any coil signal looks different than the others.4. Can scope the IGF signal on the White/Red wire when the engine is cold and compare to when hot when the problem occurs and look for the clean consistent 0-5 volt signal.5. Can use a low amp current probe on the Black/Red wire at each coil and look at the current flow of each ignition coil when running and compare when the engine is cold to when hot and see if they are all the same current ramp pattern or a different current ramp pattern when the problem occurs.6. Scope the Crankshaft Position (CKP) sensor and look for a clean consistent AC sine wave signal and compare cold and hot.
It could still be another ignition coil and may need 4 more new coils. The Ignition Confirmation (IGF) signal is a 5.0 volt reference from the ECM that each ignition coil pulses to ground.
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