well I put a msd coil on and it starts and idles better and is more responsive but my cel still does the blink thing after startup but the car will idle about two minutes before the cel blinks four times now, before it would do it right away, I checked the o2 sensors and circuits and its with in spec, if I start it with any sensor unplugged it wont do the blink thing until its operating temp then it comes on and stays on like it should, there are no vac leaks, fuel pressure is good and holds, unplugged cleaned and check all sensors and circuits with my meter and there all good, the only thing I didn't check yet is the fuel pump connections at the tank, all other connections are clean
cel blinks four times after startup
- Thread starter heehaw80
- Start date
I took notice that if when I start the car cold or warm, if the cel comes on when I turn on the key and stays on during crank and goes out after start it wont do the four blink, if I turn the key on and the cel does a quick flicker and off and stays off for the crank and run it does the four flashes after start????
CC'S95GT
Post Whore
I don't know what else to point to.
yeah im at a loss too, about a year after I bought it did the four blink thing for about a month and then found that the plugs were bad changed them and unhooked the computer cleared it and no more four flashes, this time I checked, cleaned and or replaced everything that didn't spec out and still have the four flashes, the real pisser is the car starts and idles smooth, has lots of power, and average 15-16 mpg which is what I always get, so I guess im gonna chalk this up as a normal thing and just drive her till it quits then ill know whats wrong, cause I just ran codes yesterday and got a 111 koeo, 111 koer so if I find anything out down the road ill let you all know
well I unhooked the o2 sensor and pulled the harness from the sensor to the fender out and checked it, no broken or bared wires checked continuity with my meter all good, put it back in plugged both ends in and no more cel blink as of now, im thinking the plug was loose or not pushed in tight on the fender end, so hopefully this solves my problem
some na ***** is still doin the four cel blink on start up, so I unplugged the o2 sensor harness at the fender well on the pass side, started the car and no blinks and the car idles and runs good but cause its unplugged the light comes on and stays on (expected) after about 5-10 minutes of driving, so its definently in that circuit some where just gotta start tracing
CC'S95GT
Post Whore
A wiring diagram should be able to tell you the color coming out of the harness and going into the computer. But IDK if the Haynes manual will be that detailed.
I think it's the sensor itself.
You said when the O2's are unpluged the CEL stayes ON. But when they are plugged in you get the 4 flash thing. right?
That info tells me the harness is intact and it's the sensor is faulty.
I think it's the sensor itself.
You said when the O2's are unpluged the CEL stayes ON. But when they are plugged in you get the 4 flash thing. right?
That info tells me the harness is intact and it's the sensor is faulty.
I tried something and it makes a difference, I plugged everything back together started the car four blinks, pulled the fuse for the o2 heater in the fuse box and started the car bingo no blink, tried it five times, didn't take it for a ride yet will this throw a cel or just a code, will the o2 sensor work without the heater or should I replace it???
CC'S95GT
Post Whore
IDK
KillNThrill24
Legend
Lol^
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Ok...Have you ever pulled the codes WITHOUT use a scan tool? If you have a Haynes/Chilton Manual, it will show you there is a way they show how to do it. Its a a method using a volt meter and some jumper wire at the diagnostic port under the hood and it will put the car into diagnostic mode. It can be used to pull codes Key On/Engine Off or Key On/Engine Running by counting the flashes of the CEL. When you do a Key On/Engine Running Diagnostic check..the FIRST thing the car does, is flash the CEL 4 times (that denoted an 8 cylinder car), THEN....guess what it does. If you said rev's the motor and holds it to test IAC, TPS, bla bla bla function...you would be correct. That's what your car is doing. Its doing into diagnostic mode by itself. Why? I don't know but you're chasing an O2 issue that I don't think exists. Pulling the fuse is putting it into limp mode and somehow by passing that function of the ECU. Just figured you should know what the car is doing.
CC'S95GT
Post Whore
I forgot it does the 4 flashes on KOER test. It's been a while since I've pull codes on mine.
When pulling codes with a paperclip the CEL will flash out the codes if your not using the miltimeter method too.
When pulling codes with a paperclip the CEL will flash out the codes if your not using the miltimeter method too.
yes I know how to check codes with the jumper wire and count cel flashes the only code I get koeo if 543, and koer 543 and some smog codes but there expected since that's all been gone for years and every time I start the car it does the four flash rev up then almost stall then good, torn everything off cleaned checked and if needed replaced it from electrical to vacuum to fuel pressure, if I pull the o2 heater fuse I get no cel blink or no solid on cel and with that fuse out the only code I get is o2 slow switching\heater not working after the car is all warmed up it runs\idles like new and my mpg are still around 16-18 like its been for years depending on how I drive so id say it has to be in the o2 heater circuit cause and other ciruit I unplug I still get the 4 flash on startup then a solid cel witch is expected ive had this car for a long time and had it apart many time and read many manuals and threads on her, I know my 5.0 engine pretty well
Holy run on sentence...
Ok look. No one is saying you don't know the motor...but I am telling you that your car is going into diagnostics mode for SOME reason. With what was posted earlier and you've replaced the O2 Sensors...I would look further into that trouble shooting matrix posted earlier. I would be willing to bet it point you in the direction of the EEC or CCRM.
