What does a ticking engine noise and flashing check engine light mean?
A ticking noise that speeds up during acceleration, combined with a flashing check-engine light, points to an active mechanical misfire or severe internal fault. Because this happens right after major work like a camshaft replacement, drivers cannot safely tell if the vehicle is drivable or on the verge of total engine failure.
What the numbers show
Counted from the threads quoted below. How we count
- Most of it landed at once — the busiest month was October 2026, with 6 people.
- This comes up 13.2× more often in r/MechanicAdvice than across the site as a whole.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
What does a ticking engine noise and flashing check engine light mean?
- 1Posting videos of engine sounds online to ask mechanics and community members for advice or opinions.Did this help you?
- 2Guessing potential causes like fuel injectors or eliminating recently replaced parts like the timing beltDid this help you?
- 3replacing parts directly as a low-cost diagnostic stepDid this help you?
- 4performing a smoke test or using a vacuum gauge to confirm the issue before buying partsDid this help you?
- 5pulling over at servicesDid this help you?
- 6waiting hours for roadside assistance like RACDid this help you?
- 7bending back the dust shield by handDid this help you?
- 8checking if the rotor spins with the wheel offDid this help you?
- 9inspecting components like the radiator fan and checking for loose parts under the hoodDid this help you?
- 10Checking and topping up the engine oil level manuallyDid this help you?
- 11Buying an inexpensive OBD2 bluetooth dongle to read engine fault codes using a smartphoneDid this help you?
- 12Asking for diagnostic help on automotive forumsDid this help you?
- 13Parking the vehicle and not driving it to prevent potential engine damageDid this help you?
- 14Asking AI tools for preliminary mechanical adviceDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“So my car started making this noise after a check engine light.”source ↗
“it’s making a super weird noise, it’s constant any time the engine in on but there is no check engine light or anything on the dashboard.”source ↗
“I’ve been dealing with many issues with the vehicle, and I’m trying to figure out whether the engine sound in this video is normal or not.”source ↗
“The engine has already had a camshaft replaced last month, but I’m still experiencing the following: 1- Ticking/tapping noise, especially when accelerating at lower speeds. 2- The ticking becomes much faster/more noticeable when accelerating. 3- Under hard acceleration, the check-engine light sometimes starts flashing. This has happened more than once. 4- I also hear a high-pitched whistle/whine from the engine.”source ↗
“Test, don't guess. No need to fire the parts cannon.”source ↗
“smoke test first no question because replacing purge valve without confirmation is just throwing money at a random part”source ↗
“The purge valve on this car is very inexpensive and super easy to replace. I think it is worth replacement as a step in diagnosis.”source ↗
“I’ve pulled over at the services because I started hearing a loud noise and upon parking, a burning smell as well.”source ↗
“This is after driving 2 hours on the motorway, still have 2 more hours to get home.”source ↗
“I’ve also checked the rotor with the brake disengaged and it doesn’t spin.”source ↗
“I have a VW Crafter 2011, the oil light has been flashing red three times periodically while driving, and the DPF light came on while I was driving a few days ago but went off on its own.”source ↗
“I have also noticed my fuel has gone down much quicker than usual. Can anyone help me with a diagnosis?”source ↗
“Currently parked up and not driving from advice from AI.”source ↗
“I've had this recurring problem of my car stuttering while I accelerate and my oil lamp blinking yellow for a short bit.”source ↗
“wanted to know if anyone could help me identify the problem since im pretty short on money rn and cant really afford the mechanic.”source ↗
Where this came up
People with this problem also raised
- 4Is it safe to drive with the ABS light on?
- 150How to explain an intermittent car noise to a mechanic
- 28Why are my oxygen sensor readings going crazy during a misfire?
- 100How to figure out what an unfamiliar car engine noise is
- 74Why does my car make a loud rattle when starting the engine?
- 28Why does my car run terribly and stutter after a long drive?