Flashing check engine light at idle
Flashing check engine light at idle So I believe my exhaust gasket is busted(new on the way)
Anyways, engine idle is kinda rough and eventually gets worse. Then the light comes on, I will be honest I haven't had the code run. However When I accelerate it goes away. Car runs above idle. I have a ticking noise that matches with broken gasket. My question is can this gasket being broken cause a random cylinder misfire and if it can wouldn't it be worse when I accelerate.
Anyways, engine idle is kinda rough and eventually gets worse. Then the light comes on, I will be honest I haven't had the code run. However When I accelerate it goes away. Car runs above idle. I have a ticking noise that matches with broken gasket. My question is can this gasket being broken cause a random cylinder misfire and if it can wouldn't it be worse when I accelerate.
Also made the mistake of ordering off Maryland Speed as they had the pacesetter Y listed and it didn't say like other sites out of stock or that it would have to be ordered from a 3rd party. 10 days later still hasn't shipped and because I called they decided to look into it, guess its a good thing I called.....maybe it wont take them 10 more days to find out if they do or don't have a y and or ship my order.
Joined: Nov 2001
Posts: 34,632
Likes: 2,557
From: Schiller Park, ILL Member: #317
No, a flashing SES indicates a significant/serious misfire. So if this light is flashing, then you can at least expect to see a P0300 (random multipe misfire) code as well as likely a P0301-08 (these indicate cylinder specific misfires - the last number in the code indicates the cylinder).
Usually a leak near a front O2 sensor would cause the sensor to react as though there was a lean condition (due to outside air entering via the leak) and add more fuel, but I wouldn't normally expect this to cause such a serious misfire; an extremely lean condition, poor spark, or something else wrong inside a specific cylinder (such as a broken valve spring, bent push rod, etc.) would be more likely causes. I would scan the codes and see what else might be hiding behind the P0300. Fixing the exhaust leak may or may not solve your issues, but have you actually found an exhaust leak or are you just basing this on the ticking sound?
Usually a leak near a front O2 sensor would cause the sensor to react as though there was a lean condition (due to outside air entering via the leak) and add more fuel, but I wouldn't normally expect this to cause such a serious misfire; an extremely lean condition, poor spark, or something else wrong inside a specific cylinder (such as a broken valve spring, bent push rod, etc.) would be more likely causes. I would scan the codes and see what else might be hiding behind the P0300. Fixing the exhaust leak may or may not solve your issues, but have you actually found an exhaust leak or are you just basing this on the ticking sound?
Teching In
Joined: Jun 2014
Posts: 38
Likes: 0
A flashing MIL just indicates that a condition exist that is likely to damage the converters. Lol. The protocol in the test may not know you don't have them in place. Maybe you have a rich condition at idle? By introducing more air (off idle) it leans the mixture out? Just a thought
Just read rpm's reply, he broke it down pretty damn good. Without codes we shoot in the dark as to the cause.
Just read rpm's reply, he broke it down pretty damn good. Without codes we shoot in the dark as to the cause.
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Joined: Aug 2007
Posts: 24,241
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From: Turnin' Wrenches Infractions: 005
No, a flashing SES indicates a significant/serious misfire. So if this light is flashing, then you can at least expect to see a P0300 (random multipe misfire) code as well as likely a P0301-08 (these indicate cylinder specific misfires - the last number in the code indicates the cylinder).
Usually a leak near a front O2 sensor would cause the sensor to react as though there was a lean condition (due to outside air entering via the leak) and add more fuel, but I wouldn't normally expect this to cause such a serious misfire; an extremely lean condition, poor spark, or something else wrong inside a specific cylinder (such as a broken valve spring, bent push rod, etc.) would be more likely causes. I would scan the codes and see what else might be hiding behind the P0300. Fixing the exhaust leak may or may not solve your issues, but have you actually found an exhaust leak or are you just basing this on the ticking sound?
Usually a leak near a front O2 sensor would cause the sensor to react as though there was a lean condition (due to outside air entering via the leak) and add more fuel, but I wouldn't normally expect this to cause such a serious misfire; an extremely lean condition, poor spark, or something else wrong inside a specific cylinder (such as a broken valve spring, bent push rod, etc.) would be more likely causes. I would scan the codes and see what else might be hiding behind the P0300. Fixing the exhaust leak may or may not solve your issues, but have you actually found an exhaust leak or are you just basing this on the ticking sound?
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