Got rid of it at 225k after I destroyed the transmission. A flashing check-engine light generally indicates that there is a failure in the emission control system. 30 years of experience. My car won't accelerate over 40 mph and the check engine light is on . It stops flashing when I'm at a stop or under 25 mph or so to a constant being on, like it has been for a while. I ran it that way for 60k miles without an issue. An oxygen sensor reads the air and fuel mixture and lights up when it is out of range. I had a 2001 with the misfire and check engine light, but never noticed an issue with how it ran. And what makes a blinking check engine light even worse is the damage done to your time and the expenses it can run up to fix it. Mechanic's Assistant: Does the light stay on, or does it blink? ... when driving at 35 or 60 mph, the traction light comes on. My car has 152000 miles. On my way up to school, driving at around 70+/-MPH for about 2.5 hrs, my check engine light started flashing about every 15-20 minutes (would flash for 3-18 flashes each time) then go off. My check engine light starts flashing at 65mph(2003 chevy silverado 2500 6.0) it reads code 300, i have changed my plugs,wires,mass air flow sensor,crank sensor, oxygen sensor,battery, when i tow my 26ft travel trailer it doesnt come on unless im going down hill, no one can figure it out Idles rough at a stop unless I put it in neutral seems to idle a little smoother. GM manual says this is a misfire detected in the engine- any thoughts? Getting it checked out this week. Save Share. If the light is not flashing, check the gas cap. After drying, it'd work just fine as long as no major water was around getting under the car whilst driving. Check engine light flashes, would go over 30 mph | Find answers to your 2003 Volkswagen Jetta question from certified mechanics and auto experts. Reply. If the light is flashing, take your vehicle in IMMEDIATELY to be diagnosed and inspected--a flashing light indicates a serious problem with one of your vehicle's components. The emission control system contains an array of sensors that work to reduce the amount of pollution released into the air. Both. This flashing is no cause for concern, but you should take note of the occurrence and drive a bit more carefully. Car is slow to accelerate Inspection: $79.99 - $89.99: Get a Quote: Tim Charlet. Joined Aug 30, ... which would prevent the car from going over 40 mph. Now my 2004 is doing it and the check engine light starts flashing if I go over 70 mph. Check engine light flashing when driving past 40 mph, engine vibrating when idle or moving slowly, slight delay of starting up engine, and car has trouble accelerating as fast as it used to do. The traction control light (or TCS light) often flashes at the very moment wheel slip is detected and the system kicks in to correct the problem. Hasn't given me trouble so I thought nothing of it till it started to flash. Hi there. Check engine comes on and flashes at 30 mph,loss of power,rough idle. Just yesterday the orange engine light started blinking when I'm accelerating. It'll blink when over 40 mph and then it'll just stay on steady afterwards Oftentimes if the gas cap wasn't tightened enough, the check engine light will display. My car has an automatic transmission. Automotive Mechanic. A check engine light that’s flashing is up there with one of the most daunting sights that anyone with a vehicle can see. Help all of a sudden my accord wont go over 25 mmiles per hour and check engine light steady flashing . Recommended Services.