color me dyslexic, code 32 NOT 23

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Busted Knuckle

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I've had EGR codes thrown from a partially clogged cat. It wasn't until it became fully clogged did I figure that out. To test for a clogged cat, remove the O2 sensor. If it ran bad before it will run OK with the O2 out. A mild clog will need a pressure gauge.

I believe I clogged the cat by using products that knock carbon off the pistons and valves. Most notably running 500:1 syn TC-W3 2-cycle oil in the gas.
 

kenh

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My '88 threw the EGR code but I'd deleted it. Does the OP's truck even have an EGR valve? Back when I researched mine it said the ECM was looking for a change in MAP which would indicate a change in airflow indicating that it's doing its thing. The other part is, if the ECM knows EGR is inop, is it smart enough to not engage the EGR timing modifiers?


Yes my truck does have an EGR valve. It seems to run fine so no emergency fixing it. I will check it out as soon as I don't have to work 14 hours a day. Probably do it next weekend.

I spent this weekend tidying up the plug wires, cleaning ground wires and fixing the dash in the process of checking out my sometimes working temp gauge (didn't fix it).

Ken
 

PlayingWithTBI

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IIRC while idling, you can physically depress the diaphragm on the valve with your finger or a screwdriver and, if the engine stumbles, the EGR valve is good. Then you need to check your vacuum line - make sure it's connected to the correct port and not the vent on the module, and check the vacuum line from the TB base to that module. Otherwise check the electrical connector to the controller to ensure it has a good ground. If (big IF) everything is good, you may have to remove the manifold and clean out the passages to the EGR port. Most common issue is the EGR valve itself is bad. Here's a picture of the vacuum lines on an 88...

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Schurkey

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IIRC while idling, you can physically depress the diaphragm on the valve with your finger or a screwdriver and, if the engine stumbles, the EGR valve is good.
Lifting the EGR valve manually verifies the exhaust-gas passages thru the entire EGR system.

It doesn't verify the EGR valve itself. The diaphragm could still be ruptured; or the backpressure-sensing section of the valve (if used) could be faulty.
 

kenh

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All good info. Dont feel much like doing anything this weekend. I had to put my dog down yesterday. I had her for 14 1/2 years. Cried like a baby as I was putting her in her forever bed.
 
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