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Old 10-12-2018, 07:04 PM   #31
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Re: Hope or False Hope


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Originally Posted by Gregsoldtruck79 View Post
Its hard to even find a pic of a intake manifold for a 87 Pontiac 2.2 engine. But I did find something interesting in an article. On some of the older Pontiac engines even if the EGR was good, it would still not work as it should.

Because when the EGR was removed, down inside the intake manifold under the EGR just an inch or so down, is a port hole that runs out of the intake in to a airway channel, This port and channel can get so clogged with carbon, it renders the EGR useless. Just putting it our here for thought, as it may not even apply to the OP's model manifold.
Thanks, Greg. So, do you think it would help if I post some pictures of my manifold area? Just so you know, the EGR that was in there apparently was still "good", as it did not behave any differently as the new one I bought/installed 2 days ago..........so dont think it is the fault of the egr- gotta be something else like, as you say, manifold design, etc.]

Does this port that ca get clogged go toward the ENGINE or back toward the TBI? I can try to ream it with a brass brush(?).
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Old 10-12-2018, 07:14 PM   #32
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Re: Hope or False Hope


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Originally Posted by Brainbucket View Post
Sounds like the EGR is opening to quickly for the engine to respond. There is a time delay switch that delays the opening by 85 seconds on that car. Yes I'm that old and seen this before. 40 year master auto tech. I started in 78. I hated that 2.0 but I was the only one that would work on them because the other techs would run when they came in. Gotta love it.
Brain, if I take a picture and post it you will notice (and even if I dont take a pic, I can explain) that there is no electrical/electronic connections at all on my EGR. It is strictly a mushroom device, with a vac line going toward the back, into the TBI base. So no "delay switch", best as I can explain it.

But, This interests me much- you are familiar with those J cars?? 2.0L sunbird?
It has NO timing scale!! Even though the manual shows it! AND the engine bay shows sticker saying you have to time to some degrees before TDC. How can you do that with no timing scale??!

Anyway, doubt that can be thecause of my rough idle. Just worth mentioning.

Last edited by papereater; 10-12-2018 at 07:18 PM.
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Old 10-15-2018, 09:23 AM   #33
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Re: Hope or False Hope


I looked at a view vacuum diagrams. Need to know what engine, the 8th digit in the vin will tell me. Is it auto or manual and does it have cruise control? What model, base, SE, or GT? Gotta know what diagram to look at. Also, does it have a distributor or DIS (Distributorless Ignition System)?
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Old 10-19-2018, 05:45 PM   #34
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Re: Hope or False Hope


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I looked at a view vacuum diagrams. Need to know what engine, the 8th digit in the vin will tell me. Is it auto or manual and does it have cruise control? What model, base, SE, or GT? Gotta know what diagram to look at. Also, does it have a distributor or DIS (Distributorless Ignition System)?
Sorry for delay in replying, Brain, I thouight this thread might have been dead, but glad you are still offering to help.

8th digit is K, I believe it stands for 2.0L TBI injection. It IS a manual. GT. It does have a distributor cap, so I guess it is NOT a DIS, right? My Haynes manual shows it to be the HEI (distributor) system (High Energy Ignition- means it has supernatural powers, I guess).

Drive it every day to work, get many stares from everyone. 210,000 miles now.......
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Old 10-20-2018, 06:02 AM   #35
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Re: Hope or False Hope


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Thanks, Greg. So, do you think it would help if I post some pictures of my manifold area? Just so you know, the EGR that was in there apparently was still "good", as it did not behave any differently as the new one I bought/installed 2 days ago..........so dont think it is the fault of the egr- gotta be something else like, as you say, manifold design, etc.]

Does this port that ca get clogged go toward the ENGINE or back toward the TBI? I can try to ream it with a brass brush(?).
Sorry it was not an article, it was a UTOOB video that I watched. And as I said, it may not even be related to your intake manifold design. The tech in the video is using a high dollar scanner to diagnose a EGR performance on a 90's model engine. He will show the port cleaning that can be an issue on some intake manifolds.

https://www.bing.com/videos/search?q...4&&FORM=VRDGAR
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