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Dang man, you're making me want to strip my engine down and do some work on it.
Good to hear things are going well for you so far. Keep up the good work!
Well it's easy since I have everything apart at the moment. Would probably be a different story if I had to take everything apart. But it's good to know that everything is new. Peace of mind
are you doing the remanned from fuel injector connection?
will probably buy new. Saw they have a set for 180. But yes, will buy from them
https://fuelinjectorconnection.com/products/86-92-corvette-camaro-pontiac-ta-bosch-design-iii
I keep thinking I'm going to delete the EGR system (not for HP, just to clean up the engine bay because it always gets in the way).
If I do that, I'm probably going to tear down to the intake manifold and re-do all the gaskets etc. Engine could probably use a rebuild but I'm lazy and cheap so I don't want to spend the time/money.
Started reading about the delete but decided not to do it (for now).
Don't remember though what it was that made me decide against it. I might look into that in the future, but for now I just want to get it to a baseline running condition. If I start removing things now and have an issue it will be more difficult to troubleshoot.
But would definitely be interested in your progress in case you decide to do it.
Just called them about the injectors and placed order. They're actually rebuilt, wording was a bit confusing. Got a set of spark plugs as well.
agreed, get the baseline working first and then worry about mods.
I think the EGR is necessary for emissions in some places. It can also throw codes if the ECU isn't reflashed. There are no horsepower gains associated with it either. It's purely cosmetic/simplifying. To me, it's one more system that I don't really need and that clutters up the engine bay. That said, right now my car is completely stock and I kind of like it that way.
Anyway, don't want to hijack your thread. If I decide to do it, I'll definitely start a thread with the process. I haven't really done any work on my car (that wasn't absolutely necessary) for almost a year now, due to kids and job, and I'm eager to get wrenching on something fun again.
I am assuming you replaced the fuel pressure regulator diaphragm also.
Not yet but it's on my shopping list for next parts order.
Hoping to get started with wiring harness install this weekend. Have to clean it first and wrap with heat resistant tape if needed.
Went over the replacement harness and taped everything.
Noticed that at least one connector is different, so I'd need to swap that over. Could be more that I haven't noticed yet. Not a big deal, color coding appears to be the same.
However, the more concerning part is that I noticed a missing wire coming from the smaller ECU connector. It's the black/purple wire coming from Port 11. Right now I have no idea where this goes on the original harness. That port is not used on my replacement harness.
I have a Haynes manual but just can't work with their wiring diagram. I have to Google for a better one.
if anyone has a link to a better diagram please let me know.
My replacement harness is off an 88 manual, manual climate control.
here a pic of the relay which has a different connector on the new harness. Original connector is flat, on my new harness it's roundish.
You're going to have to trace that wire in the original harness and see what it does.
GM doesn't use black with a tracer much other than blk/wht which is Ground 450, data and ECM grounds, and a blk/red which is a dedicated ground for the ICM to ECM. Blk/purple is an odd one. I don't recognize it, but suspect it will be a ground-potential circuit, because its predominate color is black.
I looked in my 88 Y-car, and 87 F-car manuals for you and didn't find a blk/pur or any connection to Cavity C11 in either of them. You're going to have to trace it and see where it goes.
Thank you. Yes I will do that.
I also have two black plastic lines going into the interior on the original. All harnesses I looked at over the past weeks only have one. Has something to do with climate control I think, need to see what exactly they do/what it's called. Have to trace those as well and see where both are going.
If it wasn't for the many different colors and the cost of buying those wires I would have built a new harness from scratch.
2 plastic lines are vacuum supply to HVAC controls, and heater core coolant valve control, on Manual HVAC. 1 plastic line is vacuum supply (to controller) on C68 Electronic controls. Exception is 1986 C68 still uses the vacuum operated heater valve, and there are 5 solenoids in the controller. AFAIK, the C68 (other than 86) does not use heater valves, so only one vacuum line.
Sounds like the harness I got then was not the correct one. It was advertised as manual climate control, unless the 88 are different, which I doubt.
I guess I will have to follow both lines on my original harness to see what's up and maybe modify the one I have.
I wrote this incorrectly. I should have written it as "AFAIK, the 87 C68 (other than 86) does not use heater valves, and neither manual or C68 use heater valves in 88-up, so only one vacuum line for 88-up"..
On a deal like you've got going here, the best course of action is to compare the two harnesses, figure out the differences for yourself, and configure the new harness accordingly. Even guys like myself that have hands-on experience with every year of C4 probably shouldn't be trusted to know or remember all the little nuances from year to year which are numerous.
Got it and makes sense. Thanks a lot for your help and the explanation.
I will open up my original one and compare. Thankfully not too big of a difference except a few things here and there. And the new harness I got is in pretty good shape, so it's worth modifying. Hopefully my new wiring manual gets here quickly. This will definitely help a lot.
Just checked again and the mistake must have been on my end. Not sure what happened, maybe it was the lack of coffee in the morning. The black/purple wire is correct. So all of that matches. Now it's just a matter of replacing that one connector and trace the one HVAC line and add it to my replacement. Unless I find other differences.
so now that youa re deeper into this, do you think the car had a fire or a major electrical issue that almost became a fire or what? have you found the root cause?
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.
