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1986 2.8l 2wd 2dr blazer
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Discussion Starter · #1 · (Edited)
Not sure if I should post here or the 1st gen forum but:

1986 2.8l 2wd blazer. When running it's like you foots on the gas. When driving it'll take off on it's own. To the point where I can get up to 60 and never touch the gas pedal. Replaced IAC and TPS. Rebuilding throttle body today, needed it more than the current issue but figured I'd throw that out there to. No vac leak, that I can find. Maybe I'm just missing it idk. No CEL. Throttle cable dosent seem to be hanging up. Any ideas what I could be missing?

TL/DR:
ended up being egr related.
 

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Awww..you ain't got shit!
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Spray around the throttle body and the intake with either water or carb cleaner. If water and it finds a vacuum leak, the engine will cut out. If you use carb cleaner, it will kick up. Some people freak out about the water, but I've done that trick for decades. Doesn't hurt a damn thing.
 

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1986 2.8l 2wd 2dr blazer
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10 Posts
Discussion Starter · #3 ·
Spray around the throttle body and the intake with either water or carb cleaner. If water and it finds a vacuum leak, the engine will cut out. If you use carb cleaner, it will kick up. Some people freak out about the water, but I've done that trick for decades. Doesn't hurt a damn thing.
I've got the throttle body off now. Should get it back on after work today.
 

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1999 Chevrolet S-10, 2.2L, 5-Speed, 2WD
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Make sure you check that your throttle body isn't warped before you put it back on. I had mine warp on me which caused the exact same issue (creating intake leak). If it is not completely flat, you can lap it with some sandpaper on a very flat surface like a granite slab.
 

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1986 2.8l 2wd 2dr blazer
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10 Posts
Discussion Starter · #5 · (Edited)
Update: throttle body cleaned/rebuilt. Not warped. New MAF. Zero vacuum leaks. Still same problem. I'm at loss here. I've never ran into this issue before and neither has my grandpa(he's my go-to when I can't figure something out on my own).
 

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Awww..you ain't got shit!
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Checked your timing to make sure your distributor hasn't slipped?
 

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1986 2.8l 2wd 2dr blazer
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Discussion Starter · #8 ·
Update: blocked off egr hole and plugged vac line and it calmed down to normal, while in park. Still high rpm while in any other gear or neutral. Nothing to the extent it was though. Gonna replace egr next week and see if that helps. Hard to believe a bad egr causing all this, but....idk. I'm not a mechanic. Also haven't checked timing like mentioned before either. Idk how.
 

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Awww..you ain't got shit!
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Thanks for the update. Let us know how you resolve it.
 

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1986 2.8l 2wd 2dr blazer
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10 Posts
Discussion Starter · #11 ·
Update 2:
New egr installed. It came with a bunch of washers to go in one of the holes. Wish I'd have gotten a pic. Anyway, I knew when I went to install the washer fell out. So instead of trying to find the one that was supposed to be there I just grabbed the next closest size(smaller hole) and used that instead.

Anyway, there's been a whine/whistle ever since, on top of the high idle issue. I assumed it was the hole in the washer being too small. So, I fished the one that was supposed to be installed it from the depths of the top of the motor, close to the firewall. Removed egr and not only did I have the washer thing going on the gasket slipped on one side so it wasn't sealed good and was blocking the rectangular port on the edge valve. Installed correct washer, took my time to make sure gasket was where it was supposed to be, and..... Problem solved.

Normal idle in park. Normal idle while driving. Now it's tune up time cause she's skipping something serious 😂 if it ain't one thing it's another, I guess.

Thanks for y'all's help/input.
 

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Awww..you ain't got shit!
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Update 2:
New egr installed. It came with a bunch of washers to go in one of the holes. Wish I'd have gotten a pic. Anyway, I knew when I went to install the washer fell out. So instead of trying to find the one that was supposed to be there I just grabbed the next closest size(smaller hole) and used that instead.

Anyway, there's been a whine/whistle ever since, on top of the high idle issue. I assumed it was the hole in the washer being too small. So, I fished the one that was supposed to be installed it from the depths of the top of the motor, close to the firewall. Removed egr and not only did I have the washer thing going on the gasket slipped on one side so it wasn't sealed good and was blocking the rectangular port on the edge valve. Installed correct washer, took my time to make sure gasket was where it was supposed to be, and..... Problem solved.

Normal idle in park. Normal idle while driving. Now it's tune up time cause she's skipping something serious 😂 if it ain't one thing it's another, I guess.

Thanks for y'all's help/input.
Excellent! Thanks for the follow up man. So often these things get fixed and they're left open-ended. Good info!
 

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1986 2.8l 2wd 2dr blazer
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Discussion Starter · #13 ·
Excellent! Thanks for the follow up man. So often these things get fixed and they're left open-ended. Good info!
Yeah after I searched for days with nothing to show for it I wanted to make sure I updated on everything that I did. Being able to do a quick search and find SOME type of result, even if it's not what fixes the problem, is pretty beneficial in narrowing down the issue.
 

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Awww..you ain't got shit!
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This community has helped me so much over the last 16 years I even became a lifetime member.
 
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