Got the v8 dropped in and wired to the best of my ability. My car started out as an sd v6 and now its a maf v8. I have power in the cabin and my headlights work (kinda) but no crank and I can't hear the fuel. When I turn the key the security light comes on and goes off and my temp goes off the chart. Not sure what to do. The motor is an 88 and the harness and ecu is an 87. I have no emmissions. I think its wired right but I have no idea. Wish I could get some to look at it but I live in coral springs and not too many thirdgens drive around here

 

You should hear the fuel pump. Did you install the oil pressure switch abover the oil filter?

If your temp gauge goes off the chart, chances are its not hooked up or a broken wire.

Do your gauges drop when you try to start?

 

i havnt installed the oil pressure switch just yet cause i got the wrong one. i got it to crank ( had the starter wires all mixed up ). but still no fuel. the rest of the gauges im not sure of ill have to take a look to see it again
. what is the easiest way to get the fuel to work? switch? bypass? and how do i do that. all i want it to do is start so i know that it works.

 

Hmmm, if your looking for a quick rig, maybe jumping wires for the oil pressure switch. But that may pop a circuit somewhere.

You could run a long wire from the battery to the fuel pump hot wire behind the rear seats....should be three wires, black, purple and white. One is for the sender. I cant remember which is which.

 

On my way now to get the oil switch. I noticed that the car ( I think ) is not getting spark. Is that possible because it cranks. I have a full msd setup ( the 6a, the remote coil and a cap and rotor ).

 

Check to make sure, double check your wiring, and look to see if your getting power from the ignition wire to your box.

The first start is always fun. Get too excited though and you'll overlook something.

 

okay i just saw something and im not too sure when i did ( or didnt do) the small wire that goes form the coil to the distributor has a thicker red cable with a plug on it sticking out and not attached to anything. could this be why the distributor has no power and why there is no spark. also i picked up the sensor and it doesn't thread into the block????? its the long sensor with the 2 prongs. the only other sensor they had was a fat one with 1 prong and thats not the plug that i have in my harness. help me im now lost again lol.

 

Coil to the dizzy? If your using the msd box you shouldnt have any wires going from the dizzy straight to the coil IIRC.

Should be wires from dizzy to box to coil. Or are you still using the HEI? Well still shouldnt matter. But you'll have a different number of wires than Im thinking.

On the back of your msd box should be a wiring diagram, you could also look it up online im sure. The wiring IS different for HEI and older style.

The sensor I thought had three prongs. Kinda triangular shape. Its a push in type rubber connector.
I believe it doubles as an oil sensor AND switch. They are difficult to get the threads started.

If your using the v6 harness for the switch I could be completely wrong. If its only two prongs just jump the two wires together. I don't think it will hurt anything, have your key forward so you can hear if the pump comes on.

 

If its in your 90' Transam listed, then your issue is the pinning of the C100 firewall connector, the 90-92's are different pinout than the earlier cars.

 

ok so your telling me that the 87 Camaro harness will plug up but not connect to the correct things as the 90 v6 had? we've got it to crank over and ive discovered a few wiring issues (this is his friend who wired the best of my ability). we've got no spark and ive got cut wires coming from the starter and just hanging there. Its a pretty big mess later tonight ill put up some pics of the wiring and maybe you guys can help out more. Unfortunately this is the first swap ive attempted from v6 speed density to v8 MAF. and we've picked up 2 harnesses. one from an 88 and another from an 87 and ive been peicing together as much as possible as well as copying what my friend did awhile ago to hook up the MSD 6A box and im guessing something went wrong, and unfortunately we didn't keep the v6 harness to copy, he just cut when he pulled the old motor out...
THANK YOU GUYS SO MUCH for any and all help we recieve!!!!

 

Well that kinda turns the sails a little. You probably want to start a new thread to get the v6 guys' attention.

 

no no we have the box wired to the dizzy, and then the dizzy is connected to the coil by the small spark plug connector. and we have the black and grey plug (the coil one that joins together) connected to the proper wires from the box to the coil as well.

Right we picked up the 3 prong oil pressure switch (its decently long too) from a 90 5.7. problem is our block is a 88 so im assuming that were gona need to buy the fat 80 PSI oil pressure switch and im gona have to rewire the plug to fit the older style but what i dont understand is that the harness we pulled was out of an 87 which has the 3 prong but the auto store says it should be a single wire for that year?
And no we have no v6 harness in the car other than the cabin/dash one. everything in the bay is from a 87 and 88 v8.

also we put up another thread in the v6 forum and no responces of yet. I think the major issue we have is that the 88 bulk connector does not pin up to the 90 cabin connector. so were going to be repining to get everything to match up right and hopefully ill be able to figure out some of this open and loose wiring mess.

 

Well if the harness is three prong then I would say thats what you need. You dont need the one that matches the engine, you need the one that matches your harness. The v6 may have been different size threads, I think the 350 is 3/8 npt.

Ignition sounds good, did you check to see if you have power at the ignition wire going to the box?

I wouldnt think the cabin connector would be different, but then I wouldnt know either. Someone should be able to get you the right pin diagrams though.

 

well i just spent an hour over the phone with ssj2link and we discovered that the ignition is NOT hooked up right. actually... the red wire coming from the MSD is the ignition switch and its not hooked up... so we need to find out which pink wires control that and then we should have spark.
As for the oil pressure switch no matter how long (and i spent almost an hour trying to screw this damn thing in) I attempt to screw it in it wont thread. The plug i have is a 2 wire plug, but we picked up a 3 pronged switch... im about to figure out if this harness is even a 87... having to many issues with what it is suppose to be and what it isnt..
And the cabin bulk connector is different and we are goin to have to repin the outside bay connector, problem is i cant seem to figure out how to repin it (ive never done it before, and cant seem to find a dyi on it, and its no exactly the easiest of things to move around...)

 

They changed the pinouts a little bit, your power feeds and starter signal wire are in the same spot, however the gauge sending unit wires changed locations.

The big issue thats killing everything, pins A1 F8 and C7 of the C100 (what you are referring to as the "cabin connector" are supposed to be grounds, in my past harness work, I found that one is the ground for the VATS system, which would explain a lot of your trouble.

I've attached what i found for a pinout on a 1987 C100, and then the pinout i have for a 90-92 C100 so you can see the others that need to be changed.

 

thanks alot, funny thing is i was just looking at what needs to be swapped over, only thing now...is how do i physically take the pin out of the bulk connector???

 

Undo the connector from the firewall so its free.

Remove the plastic shroud, you'll easily see how to remove this, it just snaps on.

On the side of it you will see a white line, use a razor blade, exacto knife, etc, and pry it out this is the terminal lock, its a failsafe to make sure the terminals dont back out.

It will kinda look like this.
_____
|_____
|_____
|_____

Once that is removed, straighten out a large paperclip, the terminals in this connector are big so large paperclips work best, if you look at the side that the terminals are in, not the end the wires are in, you may be able to see, if the sealant isnt in the way, that theres a spot just above each terminal, if you stick the paperclip in there, it make take a bit of working around, but you'll be able to release the tab on it and pull the wire out the other end.

 

ok so i started repining the 87 harness to match up the 90 harness. MAJOR issues. the 87 has no fuel wiring what so ever. the diagrams I have for the 87 dont match up to the proper wiring colors either. If ANYONE could give me a list of every plug and the color of the wiring for that plug for the 87 TPI harness i would seriously apprecieate it! Ive yanked out the complete harness to basicly start from scratch. i have 2 full days to work on this thing and need to get it back in the car asap. I have alot of the plugs, but im going back over everything. ive searched as well and not much as poped up. All help is severly appreiciate it!

 

My suggestion, get another uncut V6 harness since you cut his up, add the extra injector wires and make the other few changes necessary and get a stock V8 prom, you'll have the newer setup that most people use to replace the maf setup. The existing V6 computer is the same as the V8 tpi one.

The other issue is that now you'll have two sets of windshield wiper wiring as IIRC the 87 has it part of the engine harness, and the 90-92 its part of the headlight harness.

 

No no we don't have the v6 one at all. The only original harness we have is for the 90 v6 headlight/wiper harness. Were getting rid of the speed density set up and converting to MAF. We still have the v6 speed density harness in the dash. What if we just convert the dash harness to the v6 MAF one? would everything plug up properly? Your correct with the 87 camaro having the wiper harness in the engine harness. This trans am is being a major pain in my rear... I've also got 2 pcms from 2 TPIs. Also I don't understand why the bulkhead I have for the v8 87 harness doesn't have any fuel wiring?? And why ours isn't matching up to the other diagrams. Still would like the 87 engine harness spread out with plugs and colors to match tho!

 

Yes, i know you dont have the V6 engine harness, what im saying is your going backwards swapping from MAP to MAF, the map setup is better thats why its preferred for swaps, the harness is the same, the setup is batch fire so using a V6 harness for the V8 isnt very hard, you'll only have to get the correct prom for the computer, you wont have to play any repinning games.

Trying to change the interior harness is going to cause you even more trouble, it will just be in different places.

 

this is my friends car and he choose to go MAF in which case im going to make this damn thing work for MAF. we cant afford to switch it now. All i would like is the 87s plugs and coresponding wires. Ive figured out the spark issue with the MSD tonight so ill rewire that in the morining. i keep asking cause i have a few plugs i think might me missing, or there just random wires everywhere. and the only thing really needed to be repined is the starter and charging system wire to correspond to the proper socket.