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Old 07-16-2018, 11:49 PM   #1
m80glostick
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Default Cel, randomly blinking

Ok have random cel that I checked out with my OBD2 reader, no code present. Checked with 3 different OBD2 readers one at AutoZone a regular code reader and a real time. No codes, cel is on and randomly blinks. Code came up, changed plugs and checked compression which is good on all 4 cylinders. I'll try to go to pepboys tomorrow. But any other things I should check or how?
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Old 07-17-2018, 12:43 AM   #2
CarmelValleyWRX
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so the light is on? or is it off and flashes on once in a while for a second?
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Old 07-17-2018, 01:20 AM   #3
m80glostick
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The light is on and flashes once in a while for a few seconds. I am trying to keep it under 2500rpm as I need to drive it to work

Also on another note to this, car seems to not have power like it did. Little fluttery on acceleration. The isle seems to hunt a little as well.

Last edited by m80glostick; 07-17-2018 at 08:59 AM.
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Old 07-17-2018, 10:30 PM   #4
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Update, had O'Reilly auto parts check cel. No codes, still randomly blinking. Any leads or anything I can check?
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Old 07-17-2018, 10:45 PM   #5
CarmelValleyWRX
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i still dont get it. the light is on and then turns off for a second? i dont get the blinking part.
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Old 07-17-2018, 10:52 PM   #6
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Originally Posted by CarmelValleyWRX View Post
i still dont get it. the light is on and then turns off for a second? i dont get the blinking part.
Cel is steady on. Then every once in a while it blinks like 5-10 times then goes back to being steady
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Old 07-17-2018, 11:38 PM   #7
CarmelValleyWRX
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have you tried disconnecting the battery for a while to reset the ECU?
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Old 07-18-2018, 09:14 AM   #8
m80glostick
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I can hit "clear code" on reader light goes off, but every time I hit boost it flashes again. Just put 100 octane in tank. Nice $100 gas tank, still same issue. I'll try disconnecting battery when I get home.
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Old 07-18-2018, 09:20 AM   #9
Valarius Starchaser
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Does it cut boost when doing this? Try running just waste gate pressure by running the compressor housing line directly to the wastegate

I bought a car with the restrictor pill removed and no tune that did this over 9psi or so flash “no boost” flash “boost” flash “no boost” kinda like that

Other then that O2 sensor lean codes cam position sensor codes and vacuum/boost leaks can cause a flashing CEL all due to the engine running lean or thinking it is and dumping fuel to save itself
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Old 07-18-2018, 09:24 AM   #10
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+1
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Old 07-18-2018, 12:22 PM   #11
CarmelValleyWRX
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i think misfires will cause a flash also. have you tried a different scanner? maybe its just not reading the code right for some reason. maybe unplug and plug back in the scanner a few times to make sure all the pins are contacting on the plug. there must be a code if the CEL goes away when you clear the ECU.
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Old 07-19-2018, 09:10 AM   #12
m80glostick
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Quote:
Originally Posted by CarmelValleyWRX View Post
i think misfires will cause a flash also. have you tried a different scanner? maybe its just not reading the code right for some reason. maybe unplug and plug back in the scanner a few times to make sure all the pins are contacting on the plug. there must be a code if the CEL goes away when you clear the ECU.
Just tried the 5th different scanner. Shows nothing, I don't think boost cuts out, doesn't feel like it. My foot let's off gas quickly when it's flashing tho.
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Old 07-19-2018, 09:12 AM   #13
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Originally Posted by Valarius Starchaser View Post
Does it cut boost when doing this? Try running just waste gate pressure by running the compressor housing line directly to the wastegate

I bought a car with the restrictor pill removed and no tune that did this over 9psi or so flash “no boost” flash “boost” flash “no boost” kinda like that

Other then that O2 sensor lean codes cam position sensor codes and vacuum/boost leaks can cause a flashing CEL all due to the engine running lean or thinking it is and dumping fuel to save itself
It doesn't quit boost, it just flashes. I'm thinking possible misfire but idk where to start without a code
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Old 07-19-2018, 11:30 AM   #14
Valarius Starchaser
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I have had a misfire that never actually audibly misfires and that would turn the CEL on then after 3 starts gone a few days would go buy it would come back IACV fixed that for me all that aside I was always able to scan the history code of the misfire

Next time it’s flashing stay in it a bit do you have a boost gauge also do you have cats or full catless?
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Old 07-19-2018, 09:46 PM   #15
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Believe I have cat. It's Cali legal exhaust. Just dropped off at a local shop.
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Old 07-19-2018, 10:16 PM   #16
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I had a similar issue that wasn't reading a code. Did some research and found something about injectors being wrong size. I had just put dark blue injectors in and was getting ready to drive to the tuner. As long as I stayed out of boost it didn't flash. Get above 2psi it would flash for a few seconds. This was all done during my JDM swap so I was expecting codes but the only one that read was the PCV blow by p1491 code. Maybe something going on with an injector not firing properly? How many miles on engine? Done any work recently? Any changes to gas mileage before this started?
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Old 07-21-2018, 11:41 AM   #17
Valarius Starchaser
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Dying fuel pump could go hand in hand with an injector issue as well Buick’s 3100/3400 have a map sensor code that comes up and is associated with rough running like it’s getting unmetered air and a flashing CEL

Hopefully that shop doesn’t just throw parts at it trying to fix it and does a proper diagnostic sequence to find it for you please update for others
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Old 07-22-2018, 09:52 AM   #18
danger1138
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Flashing* cel indicates a real time misfire. Do you feel the car buck at all when the cel is flashing?

Try changing coil packs, they may be old. Also check spark plugs , may have the wrong gap.

Has the car ever been tuned?
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Old 07-23-2018, 05:00 PM   #19
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Originally Posted by danger1138 View Post
Flashing* cel indicates a real time misfire. Do you feel the car buck at all when the cel is flashing?

Try changing coil packs, they may be old. Also check spark plugs , may have the wrong gap.

Has the car ever been tuned?
Car has been tuned, will pull plugs and check gap as soon as I can. Dropped it off to local shop they said "So we couldn't pull any codes either.. said that next step is to do a leak down test on the right side, coilovers 1 and 2 to see if it holds compression because it is behaving like a misfire. Seepage at expansion tank, and a smell of exhaust in my coolant". So they suggest doing another compression test and my head gasket. I just don't like that when I called and asked if they can pull a factory code they said yes and couldn't pull a code.
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Old 07-23-2018, 05:03 PM   #20
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Quote:
Originally Posted by snow_bound26 View Post
I had a similar issue that wasn't reading a code. Did some research and found something about injectors being wrong size. I had just put dark blue injectors in and was getting ready to drive to the tuner. As long as I stayed out of boost it didn't flash. Get above 2psi it would flash for a few seconds. This was all done during my JDM swap so I was expecting codes but the only one that read was the PCV blow by p1491 code. Maybe something going on with an injector not firing properly? How many miles on engine? Done any work recently? Any changes to gas mileage before this started?

Well, I moved to California, 239k mileage on motor. No engine work as I'm just trying to get the engine to last a bit longer, shop couldn't pull any codes either, I went to garage one Subaru workshop in Campbell down the street from me
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Old 07-23-2018, 05:05 PM   #21
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Quote:
Originally Posted by Valarius Starchaser View Post
Dying fuel pump could go hand in hand with an injector issue as well Buick’s 3100/3400 have a map sensor code that comes up and is associated with rough running like it’s getting unmetered air and a flashing CEL

Hopefully that shop doesn’t just throw parts at it trying to fix it and does a proper diagnostic sequence to find it for you please update for others
The shop is saying it is a misfire but can't figure out which cylinder it is. $160 for a diagnostic fee and now wants to do a headgasket on the right side
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Old 07-24-2018, 08:48 AM   #22
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Op run away from that shop! How the eff did they determine a head gasket job is warranted?
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Old 07-24-2018, 01:20 PM   #23
CarmelValleyWRX
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i bet you the DTC are disabled in your tune. do you have a way to look at the ROM and reflash? some tunes like carberry will only show a CEL and DTC while something is currently messed up and go away if it starts working again. it wont store codes usually. its annoying when trying to find intermittent problems.
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Old 07-24-2018, 01:46 PM   #24
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Op run away from that shop! How the eff did they determine a head gasket job is warranted?
Idk, they said they smelled exhaust in my coolant reservoir. I looked no discolorization couldn't smell **** and no white coming out tailpipe. Shop didn't know what they were talking about
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Old 07-24-2018, 01:48 PM   #25
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Originally Posted by CarmelValleyWRX View Post
i bet you the DTC are disabled in your tune. do you have a way to look at the ROM and reflash? some tunes like carberry will only show a CEL and DTC while something is currently messed up and go away if it starts working again. it wont store codes usually. its annoying when trying to find intermittent problems.
I need to buy the hookup again for my laptop. So currently no. Any way to test coil packs to see if bad? There original I think, usually don't go bad but kinda want to check
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