Code 63 1990 bonny - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-10-2003, 07:53 AM   #1
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Default Code 63 1990 bonny

Book says map sensor voltage high (low vacuum). I think this is related to the EGR valve or does this year (1990) have a separate map sensor. If so where is it. I cleared code and engine service light did not come back on again Yet! Thanks
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Old 01-10-2003, 09:27 AM   #2
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I may be wrong on diagnostic. EGR flow check is the cuprit. What should I do first.
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Old 01-10-2003, 02:40 PM   #3
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You have the same EGR valve I do. The little 'mushroom' digital EGR. I'm assuming you don't have a scantool, so you'll have to do it a bit simpler. These usually suffer from a mechanical binding. There'* 3 spring-returned solonoids in that sucker.

When mine threw the last code in June, I simply went in there with WD-40 and sprayed the shafts. Use this as a SOVENT, not a lube. It dissipates too quickly. Also use it to clean out the electrical connector, both sides, and let it drip out.
If this solves the problem, use a hi-temp LIGHT grease or teflon based lube on the shafts for long-term lube.

If this doesn't work, you need to check the solonoids with an ohmmeter. The pinout goes like this:

Imagine the triangle where the harness plugs in as being an arrow to the RIGHT, ie: the longer point goes to the right. Pin A is on the far right, B is in the center, C is top left, and D is bottom left.

a-d should be 20-30 ohms
b-d should be 20-30 ohms
c-d should be 10-17 ohms

If any of these are incorrect, you're replacing the valve.
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Old 01-10-2003, 03:05 PM   #4
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Much thanks for the response. Looks like I got a project for Saturday. Always something to look forward to with an older car, but I love it so...
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Old 01-21-2003, 04:14 PM   #5
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Hey thanks all. Took EGR all apart and sure enough one ot them seemed to be sticking Cleaned whole thing up and so far no problems. Thanks again.
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