Check engine light with code.....help please! - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-08-2008, 11:27 AM   #11
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you dont have an engine, huh?

swapping injectors is your next step
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Old 02-08-2008, 11:36 AM   #12
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Default injector swap

If the injector itself is bad, the open circuit code with shift to another cyl. If the injector is okay, it will stay with cyl #3. This will at least tell you if the injector is bad or not. Testing the resistance will tell you the same thing, but save you from having to get the codes read again. But if you can't test the injector, this is the way to go. Keep in mind that with that open injector circuit code, you're apt to set a bunch of other codes, like that multiple/random misfire, lean running conditions, and others. Ignore them for now, concentrate on that open injector code. Mike
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Old 02-08-2008, 11:47 AM   #13
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Quote:
Took it for another drive and now it is missing a bit. Codes now are P0300 random/multiple cylinder misfire detected and again the P0203 injector circuit open cylinder 3. Please someone help. Misfire is more noticeable during warm-up and once at normal op temp the mis is less noticeable but still there.
Put a 194 bulb in the socket and hold it there. Have someone crank the engine. Does it light up? Try another good injector ( 1 or 5 ) for comparison. If it lights up, and the code is still there, replace the injector.

RANDOM multiple misfires are more than one cylinder. Take care of the injector first, then we'll address that.
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Old 02-08-2008, 12:13 PM   #14
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Default 194 bulb

Ha, I like your side marker light bulb approach Willwren - I once had an ABS code on my '93, was an "open" in one of the solenoids, the control module was looking for a certain resistance on start-up, turns out that 194 bulb was just within that range, so I temporarily spliced that in there to verify the findings.. Sure enough, problem verified.. I bet the guy who invented that 194 bulb never dreamed of it being used as this kind of tool!!
But, back on topic - I wouldn't be surprised if that random misfire goes away with the open #3 fixed, I had a similar thing on a chrysler minivan, PCM trying to compensate for a lean condition as read at the 02 sensor, had the other cyls messed up, man, the thing would barely run. (You wouldn't have this with older cars, you would just drop one cyl and continue on)
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Old 02-08-2008, 12:28 PM   #15
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The bulb isn't chosen for it'* resistance. It'll flash with the PCM rattling the injector pulses. Visual indication that the wiring and PCM are good. If that'* good, and the injector has a very low or open resistance, change the injector.

In fact, it would be good to put a meter on there and report the resistance back here.
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Old 02-08-2008, 12:35 PM   #16
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Default yes, for sure

In the case of firing the injector, you would be looking for the bulb to light - just saying that the 194 bulb was within the resistance range on that particular ABS circuit, so I could get the ABS system to pass the initial key-on test. I never did it, but I'm guessing once the car was rolling and the ABS performed that one-time system check, the bulb would have lit - but I didn't bother, I had my answer.
I didn't mean to confuse the issue with his injector.. sorry if I did. Mike
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Old 02-08-2008, 12:37 PM   #17
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Thank you very much, yea the car still has an engine, dont know what I was thinking when I wrote that. I will try the bulb trick and report back after that. Thanks for the info.
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Old 02-08-2008, 02:08 PM   #18
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Ok I put the 194 bulb in the fuel injector 3 harness and the bulb light - flashed repeatedly like it was firing the injector. Then I pulled the injector 5 harness and the bulb flashed and lit exactly like it did in the injector 3 harness. So, does this mean I have a bad injector. Thanks Bryan
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Old 02-08-2008, 02:14 PM   #19
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Measure the resistance of the front three injectors. Report it here (ohm-meter/multi-meter job).

Let'* make sure.
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Old 02-08-2008, 02:17 PM   #20
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will have to get one from a friend and report back this eve. Thanks guys for the quick response. Great help!!
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