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Discussion Starter #1
What’s up everyone,

Got a new toy I want to share with everyone.

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This is my old new 83 s15 jimmy. First the good: The old owner claims he rebuilt the 2.8. Besides the paint on the engine and it looking pretty nice, I can’t really tell by looking. The paint and inside look like hell but I think it’ll look better with a good cleaning. The tires still have plenary of tread and it starts and drives.
The Bad: The engine will shut off if not warm. I think it’s a problem with the choke, carb adjustment, or maybe even timing. The steering wheel is turned a little to the right when driving straight. The temp gauge doesn’t work properly. The back hatch doesn’t open and the glass doesn’t hold up. It needs a started too.
Worst of all: The transmission is leaking. Today I got jacked her up, cleaned all the tranny oil, filled her up, and driver her around. The engine ran good. I’m pretty sure it was rebuilt or some sort of power was put into it. It’s way more peppy then my 83 s10 2.8. The transmission shift good as well. About 3 minutes into the drive, the check engine light came on. I was like “damn”!!! I drove it for another 3 minutes home and it drove fine. When I pulled into the driveway, I shut it off and checked for the tranny leak. It was definitely leaking. heres some quick photos I took.
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this is the bottom of the cover that hides the flex plate. I’m pretty sure it’s leaking from the bell housing. I’m no expert but I think that means it's leaking from inside the transmission somewhere. Thats the transmission.

How can I check to see why the check engine light came on? I’m my 83, it’s a little rectangular box Under the dash and a paper clip (I’ve never actually had to do this). I checked under the dash on in this and couldn’t find one. I can double check but I’m pretty sure it’s not there.
My main priorities are getting the check engine light off and the leak fixed. It won’t pass smog with the light on and I feel like an ahole getting tranny oil everywhere.
Overall: I think I may have bought A giant POS! We’ll see. At least it’s 4X4 but I forgot to check it.
 

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Discussion Starter #2
Here’s the quick photos that I took after the drive. I couldn’t post them all on the previous post.


this is the flex plate cover.
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this is the front of the transmission pan and the corner of the flex plate cover.
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At first I thought it might be leaking from somewhere on the sides of the tranny. Not I think it could be the side of the pan closest to the cover or actually coming from inside the tranny. I guess my next step is to pull the cover and find out.

Let me know what you all think!

Thanks,
Yowakawaka
 

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Discussion Starter #3
Today I took off the transmission cover and see a spot where it might be leaking.
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This is the area between the torque converter and the transmission. The photo is of the bottom bolt in that area. Here’s one of all inside the area.
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I think this might be where the leak is coming from.
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Before I jump the gun, I cleaned everything again and will check it tomorrow.

I started it again today and the check engine light was off. I took off the panels under the dash and couldn’t find the OBD1 plug in. I meant to check in the glove box but forgot. Anyone know where to look?
 

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Discussion Starter #4
Today’s update!

woke up early and checked for the leak.
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Leaking from the lockdown cable. I went to a few parts stores to get but they didn’t have it. I ended up finding a cool transmission shop that had the gasket. I cleaned it up and hopefully that’s the end of the leak. I’ll be checking it tomorrow. Here’s the old gasket.
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It slid right out. The new one was definitely a snugger fit and getting the cable back on took some force to get back in.
After, I topped it off with tranny fluid and took it for a drive. Shifted good and ever but the check engine light turned back on. The dome light also wouldn’t turn off for some reason. I ended up pulling the bulb. I also checked for the OBD1 in the gulf box and didn’t find it. I looked through the manual and didn’t see anything about it’s location.

Anyone with the same vehicle know the location of the OBD1?
 

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94 4x4,01 Blazer
2001 Blazer 4dr 4wd LT
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IIRC - '83 was behind a trim panel on driver's side lower edge of the dash- courtesy light staying on- dimmer switch all the way up or a door switch stuck/dead. And when you go to REPLACE the lock in the lift gate- get the door locks too so they are the same key.
 

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Discussion Starter #6
So I found the OBD1 today. It was located on the passenger side mounted under the dash.
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I tried to jump the connection with a paper clip but I didn’t know exactly how to do it. I just watched a video on how to do it so I’ll make sure to do that tomorrow.

After, I took her for a ride to the gas station and to fill up the tires with air. It ended up stalling on me. I was stuck by the air compressor for like 15 minutes before I could get her started. Definitely not doing that again! 😅
When I got back in the driveway, I started looking at the vacuum hoses. One of the hoses had a bolt in it and another was on a bolt that connected something to the firewall.
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It connected to Pcv valve.
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I’m not sure where it goes. I tried to read the diagram but it didn’t work out. I moved around some other hoses based off the diagram but I think I made it worse. I also tried to base it off my 83 S10 but it didn’t work. There a little different because the jimmy is a CA car. I’m gonna watch a video tonight to help.
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I think once I figure out the vacuum it’ll run way better.
 

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Discussion Starter #7 (Edited by Moderator)
The wiring was ****. I’m gonna try to make this a clear as possible so bare with me.

There are 5 wires that I found that are disconnected. 4 of them come from the same harness. Here’s a photo
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This is the first wire that I could identify.
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This is a green wire with a grey connector. I’m about 99.9% sure this is the choke wire.

This is the second wire I could Identify.
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this is a black wire with a white/yellow connector. I’m about 99.9% sure this is the temperature gauge wire. It was located on the rear left side of the engine (Before I pulled it up) where the temp sensor is located.

The 3rd and 4th wire is where it gets confusing. I think they go together but I’m gonna identify them individual first then tell you guys my theory. So....

This Is the 3rd wire I found.
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It’s a red wire with a little connector on it.

This is the 4th wire I found.
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This is a grey wire with a white/yellow connector in the middle of it and a little connector at the end of it.

So, I think there last are supposed to go to this thing (I forget what it’s called).
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On my 83 s10, the two wires are in one tube and meet at the same connector and connect to two prongs that come out of the same spot shown in the photo. I know the one in the photo (on the jimmy) is a new style connector. The new style connector (the thing in the engine)is spliced into a black and yellow wire.
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Like I said before, on my 83 s10 (non CA smog) the red and gray wire go into that connector. It also doesn’t have that connector in the middle of the grey wire. I’m thinking the guy who worked on the engine didn’t use the right wires when putting in the new style part. I’m not really sure.

Anyone have any Idea what’s going on here? Keep in mind that the jimmy is a CA smog car and the 83 s10 is not

I know this is confusing so let me know if you have any questions.

There’s a 5th wire I found but we can talk about that one later Haha

Thanks everyone!
Yowakawaka
 

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Discussion Starter #8
I was working in the vacuum hoses today and most everything is good but I have a few questions.

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Can someone tell me where the “Manif Vac Sensor” is? It’s the hose that runs off the “H” part of the carb.

Also, the hose coming off the PCV Valve splits off to a “T“. On the 2nd “T”,it goes up to the “Decen Valve”. Is the “Decen Valve” the yellow thing that goes into the air box on top of the carb (see photo below)? You can see it in the background around the center of the photo just above the distributor cap.
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Discussion Starter #10
@sgp0511 I'm gonna take care of the vacuum hoses and check engine light first. I just got a new toy to clean it up. When I do clean it, I'm gonna take out the seats and clean everything super well.
 

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I found out something about the truck today. First off, the vacuum hoses are messy towards the top of the diagram. I ended up connecting what I could and plugging what I couldn’t connect.
I started it and it automatically started easier but shortly died. Today, I had an extra set of hands (my bro). So, I had him start it and keep it running so I could poke around the engine bay. What I found out was that if I block off one of the holes in the carb with my hand, it’ll idle. If I uncover the hole, it’ll die. Here’s a photo of what I’m talking about.
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I have a Haynes manual coming and hope it’ll tell me more. Till then, anyone have any idea what might be causing this?

Also, I found where some of the wires go and put that part back under the carb that had the screen. It was sitting in under the passenger seat.

Happy wrenching,
Yowakawaka
 

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While you're waiting for your Haynes manual, go to PetSmart and get a parakeet. Haynes will make good birdcage liner. 🤣 Go on eBay and find a factory service manual. It will pay for itself many times over.
 

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TP hoarders...gotta use what you got.
 

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I'd look for one that's specific to your year.
 

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time to get cereal
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50-60 bucks for a manual that literally breaks the whole vehicle down and gives you all diagrams and diagnostic charts, as well as part numbers for special tools needed doesn't sound like a bad deal to me. If you want it to be cheaper, pick a less popular vehicle... the set for my 95 Grand Am was like 13.99 shipped.
 
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Discussion Starter #20 (Edited)
@Rhotpursuit im working on my 85 s15 in this thread.

I’m stuck in the engine so I decided to work in the inside. Here’s a before shot of the dirty inside.
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I had some trouble getting the tailgate open. There’s two bolts in this little spot that was a pain to get out. Ended up getting it tho.

The spare tire is perfect and there was a plate in there too. Check it out
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Here’s a photo of the grand finale before I clean it tomorrow!
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That original color on the tailgate looks amazing. I could imagine when it was new!
 
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