sentra flashing check engine - Nissan Forum
QG18 1.8L Engine Engine Discussion: 2000+ Sentra XE, GXE, & 1.8

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#1 Old Jul 16th, 2012, 05:15 PM
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sentra flashing check engine

Hello,

You have all been helpful ion the past, I appreciate it.

My new problem is that my check engine light on my 2000 sentra (1.8L) is flashing. I replaced the plugs and did an oil change and it is running better butthe light is still flashing. I hooked up a code reader and it indicated no code. Any thoughts would be appreciated. I do not want to clear the code until I find out what is going on.

Thanks
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#2 Old Jul 17th, 2012, 09:18 AM
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how is the car running? hard start? is your gas cap loose/bad? any details?
#3 Old Jul 17th, 2012, 01:09 PM
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Hello Speedo,

I can check the gas cap. It is running okay. It starts fine. Yesterday when I first started it smoke came off of the engine buy I think I spilled some when I changed the oil Sunday. I ran it in my garage for about 1/2 hour lAst night and there was no smoke. It seems fine but I would like to be sure.
#4 Old Jul 17th, 2012, 04:09 PM
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Finally got a code of PO303. One of the wires to one of the spark plugs looks suspect. I'll have to see if it is the third cylinder.
#5 Old Jul 18th, 2012, 09:36 AM
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pull the plugs, see what color they are, is #3 white....does it run ruff for a few minutes in the morning? I am thinking you might have a head gskt on the way out...
#6 Old Jul 18th, 2012, 01:52 PM
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Thanks,

I'll have to wait for the weekend to check it. When I changed the plugs they all seemed dry and the exaust is not white or black. Yesterday I did notice the smell of gas when I started it. But thanks for your help. I'll let you know. If it is a gasket I'll probably drive it til it dies unless it is unsafe. It's not worth the repair cost.
#7 Old Jul 23rd, 2012, 10:01 PM
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I drove the car around my neighborhood today. There was a smell of gasoline and oil. When I pulled into my driveway there was smoke coming from under the hood. I popped the hood and the exhaust pipe from the engine was glowing from heat. Also there was white smoke coming out when I took the dipstick to check the oil. Any suggestions are appreciated.

Thanks
#8 Old Jul 23rd, 2012, 11:03 PM
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I wouldn't be surprised if you had a bad head gasket. It's not an uncommon problem on the 1.8L. You could do a cylinder leakdown test to confirm (I'd start with cylinder #3). Probably damaged the catalytic converter, as well. Any signs of white liquid in the oil? How does the #3 spark plug look?
#9 Old Jul 24th, 2012, 02:09 PM
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The oil looked okay though very hot. Wouold Steel seal or any of that type of repair be woth it. The plugs also seemed okay
#10 Old Aug 20th, 2012, 01:50 PM
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Hi, a flashing engine light generally means a misfire. look in your owners manual and see if that what a flashing engine light mean for you. if so check the post I just did

http://www.nissanforums.com/qg18-1-8...ml#post1357002

I hope this helps you out
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#11 Old Aug 20th, 2012, 08:46 PM
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A flashing CEL means that the ECM is currently detecting a condition that may be damage the catalytic converter, which is often due to a misfire issue.
#12 Old Aug 21st, 2012, 01:40 PM
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Quote:
Originally Posted by smj999smj View Post
A flashing CEL means that the ECM is currently detecting a condition that may be damage the catalytic converter, which is often due to a misfire issue.

here in Canada it's called "Malfunction indicator lamp" and this is straight from my O.M.

Quote:
_________
|SERVICE|
|ENGINE | Malfunction indicator lamp
| SOON |
(MIL)

"If this indicator lamp comes on steady or blinks while the engine is running, it may indicate a potential emission control malfunction.

The malfunction indicator lamp may also come on steady if the fuel filler cap is loose or missing, or if the vehicle runs out of fuel. Check to make sure the fuel filler cap is installed and closed tightly, and that the vehicle has at least 3 gallons of fuel in the tank.

After a few driving trips, the "Service engine soon" Lamp should turn off if no other potential emission control system malfunction exists.

Operation

The malfunction indicator lamp will come on in one of two ways:
  • Malfunction indicator lamp on steady - An emission control system malfunction had been detected. Check the fuel filler cap. If the fuel filler cap is loose or missing, tighten or install the cap and contiune to drive the vehicle. the "SERVICE ENGINE SOON" lamp should turn off after a few driving trips. If the "SERVICE ENGINE SOON" lamp does not turn off after a few driving trips, have the vehicle inspected by a NISSAN dealer. You do not need to have your vehicle towed to the dealer.
  • Malfunction indicator lamp blinking - An engine misfire has been detected which may damage the emission control system. To reduce or avoid the emission control system damage:

    - do not drive at speeds above 45 MPH(72Km/H)
    - avoid hard acceleration or deceleration
    - avoid steep uphill grades
    - if possible, reduce the amount of cargo being hauled or towed.

The malfunction indicator lamp may stop blinking and come on steady. Have the vehicle inspected by a NISSAN dealer. You do not need to have your vehicle towed to the dealer.

Now this is straight from a Ex-Nissan Mechanic/Dads good budd. He said you should NOT drive the vehicle at all, as it can destroy your engine...


also for your car. does it idle every rough? like it wants to stall out? and sounds like it knocks almost? and moves very slugish, and when stopped if you do not press down on the gas slightly to keep the revs up it will/has stalled?

Like I stated in the other post. (I just tried my link and it came up dead, here's the fixed one)

-http://www.nissanforums.com/qg18-1-8...ml#post1357002


if it has. just look at your negative battery cable. the - cable connects in 3 places. to the body/chassis, to the - battery post(duh) and to the engine/tranny. it is very common for the exposed copper from the end of the cable that is crimped to connect to the engine/tranny... it is common for the copper to oxidise and break free from the crimp and cause a ECU(Engine Control Unit) Short Circuit, or other potentially deadly problem


I will grab a few pics later of mine, and what happened to the coil packs as well to show people what I mean. now keep in mind this is from a 2004 Nissan Sentra 1.8L Base model. but 2000-2006 sentras are the same model type with few variants(body style,parts used, layout of said parts... etc) this is just for a general idea. My 2004's engine bay is laid out almost the exact same as a 2001 2.0 GXE I found before.
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#13 Old Aug 23rd, 2012, 05:24 PM
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I changed the plugs and the flashing light is gone. Then I got a P0174 code. I put in a new MAF sensor and it ran better with less hesitation but I still smell gas. I read that the ems must be reprogrammed to get proper operation since the car is using data generated from the old MAF sensor. Where can I get this done?

Thanks
#14 Old Aug 23rd, 2012, 06:09 PM
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you might just be able to "Reboot" the ems? Emergency Medical Services? lol unless you mean The ECU(Engine Control Unit.. well thats what it's called in canada) it's the one in the engine bay right? I'm not sure if this would work.. but try resetting the cars computer/s by pulling the Negative battery cable I think for 5mins. that should "reboot" the system(Ie: you have to re-program the clock and radio stations. and if you have a digital Trip Odometer(tells you how far u went on a tank of gas) will be at 0 Km/0 Miles. that might help. or maybe go to a local garage, sometimes they wont charge to check and wipe the codes. and what year is the "new" MAF in your car? if it is the same model year( IE:2000-2002/2006) you shouldn't need to reprogram the ecu/ems/pcb/sqw/what ever it is in your country xD :P but if the MAF is from a different vehicle you may just need a reboot of the system and it should reprogram its self for the new MAF.
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#15 Old Aug 24th, 2012, 10:10 AM
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Quote:
Originally Posted by kevsent View Post
I changed the plugs and the flashing light is gone. Then I got a P0174 code. I put in a new MAF sensor and it ran better with less hesitation but I still smell gas. I read that the ems must be reprogrammed to get proper operation since the car is using data generated from the old MAF sensor. Where can I get this done?

Thanks
sometimes when you install a new maf, it will have to go thru a re-learn, if the old one was way out of spec, a dealer or a mech (with OBDII or consult) should be able to do it...
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