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Check Engine Light HELP!


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10 replies to this topic

#1 struculeus

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Posted 16 January 2004 - 04:18 PM

I have a 1991 Loyale. The check engine light was on, the idle is a little rough. I tried to get the computer to spit the code out, but no codes were revealed. The service manual says to replace the ECU.
I replace the ECU (with one from PAP), the car starts up, the idle is a bit high, but the check engine light is not on. Then it warms up, the check engine light comes on (d'oh!).
Again, I try and read the engine code, but it's not spitting anything out, and the light won't go out! I've tried to D-Check it, and Clear Memory, but that doesn't work either.
I NEED HELP!!!
To paraphrase Ben Stein in Ferris Bueller "Anyone, Anyone?"

#2 torxxx

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Posted 16 January 2004 - 05:21 PM

how many miles are on the car?

#3 Setright

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Posted 16 January 2004 - 05:28 PM

Does the car have a lamda sond/O2 sensor? If so, it's either disconnected or defective.

The ECU won't take readings from the sond until the engine is at operating temp. That's why the light didn't come on until then.

#4 CIS Subaru

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Posted 16 January 2004 - 05:57 PM

The absolute most common reason for a Check Engine light on an SPFI car (when operation is barely affected) is the EGR Solenoid Valve. Find yourself a nice clean one at a junk yard, and it'll likely fix the light. I had this happen on my '88 Wagon, and have seen several other guys here with the same issue. You can try cleaning your old one, but I had no luck with that.

To find the EGR Solenoid Valve, follow the vacuum line from the EGR Valve. The Solenoid Valve is on top of the intake manifold, on the passenger side, under the intake boot. It looks like a little box with two vacuum lines and tiny air filter attached. (this is all just from memory, so I might be slightly off, but I think it's enough for you to find it)

#5 struculeus

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Posted 16 January 2004 - 07:10 PM

Torxxx - It has 115,000.

Setright - Thanks for the tip, I will look into it.

CIS Subaru - I know what you mean. I've had to replace quite a few of those on the other Subs I've had. But usually, the computer will tell you when one of those goes out. I have a spare, and I will replace it and see what happens.

I'm open to more ideas if anyone has any! And thanks!

#6 Partsman

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Posted 16 January 2004 - 09:50 PM

It's not giving you anything? not even the code for the computer?

#7 struculeus

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Posted 17 January 2004 - 04:14 PM

The check engine light comes on as soon as I turn the car on, but when I run the check memory test, nothing comes out. It does't flash, it just stays on.
It sucks!
J

#8 Soobadooba

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Posted 17 January 2004 - 05:36 PM

I'm a little confused. Are you trying to get code flashings from the check engine light on the dash, or the light underneath the dash?
Just trying to clarify :)
-Louis-
'91 Loyale 4wd 5spd Wagon

#9 struculeus

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Posted 17 January 2004 - 05:47 PM

Light underneath the dash? I thought the code was relyed through the check engine light in the dash. Isn't the light under the dash on the older ones, not the 1991? If not, where would it be?
J

#10 torxxx

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Posted 17 January 2004 - 05:48 PM

no hte codes come out at the ECU
under the steering column there should be a little red light that will flash a code

#11 Soobadooba

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Posted 17 January 2004 - 05:52 PM

Yep, mine is a '91 and the codes are read underneath the dash with the panel under the steering column removed.
-Louis-
'91 Loyale 4wd 5spd Wagon




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