Bad coil pack WITHOUT a code?
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Lexus Test Driver
Joined: Mar 2007
Posts: 1,025
Likes: 13
From: McAllen, TX
Bad coil pack WITHOUT a code?
I've done quite a bit recently to make my car run well by making sure sensors are fresh and clean and working properly, such as the MAF, engine coolant temp sensor, knock sensors, oxygen sensors, and spark plugs. Car is an '02 with 179k miles. I had it running well after replacing both upstream O2 sensors, which eliminated a persistent pinging under throttle. However, recently the engine had started to ping a lot again, especially under throttle. Idles just fine. New plugs made no difference. I'm wondering about the coil packs; all are original. Can these coil packs degrade over time, causing the engine to run poorly, without completely failing and throwing a code? I saw one guy on here replaced all 8 packs and restored power and smoothness to his old motor. But at $500+ for parts, it's a lot to just throw at the car without knowing for sure they'll make a difference.
Rookie
Joined: Aug 2011
Posts: 60
Likes: 0
From: FL
I've done quite a bit recently to make my car run well by making sure sensors are fresh and clean and working properly, such as the MAF, engine coolant temp sensor, knock sensors, oxygen sensors, and spark plugs. Car is an '02 with 179k miles. I had it running well after replacing both upstream O2 sensors, which eliminated a persistent pinging under throttle. However, recently the engine had started to ping a lot again, especially under throttle. Idles just fine. New plugs made no difference. I'm wondering about the coil packs; all are original. Can these coil packs degrade over time, causing the engine to run poorly, without completely failing and throwing a code? I saw one guy on here replaced all 8 packs and restored power and smoothness to his old motor. But at $500+ for parts, it's a lot to just throw at the car without knowing for sure they'll make a difference.
I would start with the low hanging fruits first. You had pinging, you replaced O2 sensors. It solved the pinging problem, then you had pinging again. I think the O2 sensors were not the cause, but the symptom. You change the ignition coils, it may or may not solve the problem.
I would get a a scan tool that is capable of showing live data for fuel trims, O2 sensor performance, MAF output, Intake / coolant temperature (as seen by the ECU), pending codes, mode$06 tests, etc, so I could see what is going on better.
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