This MAF 88 TPI is really starting to boil my blood. It BARELY starts at all and runs like crap for about 2 seconds. Throws a code 34 too. I have cleaned all the connectors of the maf plug and receptical and also the ones of the burnoff relay. Hell, I even replaced the burnoff relay. I also temporarily swapped the MAF out of my 86 Iroc and it still runs the same. (It's been a long time since that car has been on the road tho, so I guess I could have 2 faulty MAFs?)Oh yeah, also set the TPS and IAC too. Anyways, I am considering converting this thing to a speed density system cuz my motor is pretty modded and might benifit from speed density I think. One big question I have is about soldering the connections to the ecm plugs. Isn't it true that you shouldn't monkey with soldering/butt-splicing or reconnecting any cut wire in an EFI system of any type? With a system relying so heavily on resistance values I have been told before in technical school that breaks in wires should never be fixed, just replaced.. I know soldering is the best way to connect but it actually lowers the resistance no? As for the MAP sensor itself, I can just T off of one of the pass. side rear vaccum fittings on the plenum right? My EGR selonoid is gone anyways so that should make it easy. As for the plug I can modify the MAF wires and use a new plug no problem. Am I leaving anything out? I know the ECU will be more sensitive to mods then the MAF system, so I am gonna have a prom burned when this is all done. I just really don't feel like going and wasting 150$ on a crappy Klymer MAF at auto zone when I could almost spend that on a new MAP and some plugs at a junkyard and then have a speed density. I am currently in the process of having the PROM burned so thats irrelavant to my cost issues. I even have a 1227730 ECM just sitting in storage from a parts car I bought once! Thanks for any advice, I am loosing patience with this thing!

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Mike C
88 Iroc 5spd
355 TPI, AFR 190s and lotsa other mods
86 Iroc in pieces!

 

Pity you didn't get the wiring harness with the 730 ecm (unless it wasn't from a SD TPI).

Personally, I would just get a wiring harness from a donor car (best option) or buy one (expensive option). I am not a fan of "cutting and splicing" into wires and connectors unless you are very confindent in your electrical abilities. But, if you are, then go for it. But I would ONLY do that if you have exhausted all possibilities of finding a donor car at a local (or not so local) wrecking yard.

 

Dome correctly, you can match oem.
Proper soldering, and heatshrinking.
I've done probably 6 or so CCC to EFI and different ecm conversions and in at least 300K of total miles no wiring issues, but I been doing it a while.
Decent solder and good heat shrink (not the auto parts store RS stuff) get it in the 3-4 lenghts and buy half a dozen atta time. For a 3/4 splice use about 1.5" of shrink to keep moisture/ oil / condensation out. Use a western union splice. Strip each side back 3/4" back. Hold the wires so the bear areas overlap, then twist one half together tightly, then the second side, you should have a good physical tie. It should take some effort to pull it apart. Might practice it. Then the solder, use Kester flux, and .032/.040" solder. The thick stuff takes longer to melt and you wind up putting alot of extra heat into the surounding insulation, for no real reason. Ya the devil is in the details

 

Mike,
Im in the same boat. Im in the process of converting a 1985 MAF to SD and trying to figure out the best/easiest route for the wiring harness. Trying to find a 1990-2 camaro for parts is impossible where Im located. Ive been trying for some time. Theres plenty of mid-late 80's camaros. Im thinking about just getting a 1990-2 wiring harness from a dealer even though I have the complete 1985 wiring harness. Also, not sure which port on the plenum to use for the MAP sensor. Im thinking of "T-ing" off the AC/Cruise port on the passenger side rear of plenum for the MAP.
Matt

 

For the 85 to 7730 conversion there really not much soldiering. just repinning. You get both schemitics . I got my 7730 for the gmecm FTP site. it 4 or 5 pages.
most of the color of the wires are the same. just different pin locations. You will need a third plug for the 7730 ecm it used 2 32 pin and 1 24 pin.
As fot the map sensor to the ecm. you can use teh center wire on your existing MAF plug end. this will get you back to the ecm.
You can get your 5v and 5v return from the TPS sensor.
Then the final task is the O2 sensor. you will needed a SD knocker. You can unpluged the plug at the ESC module in the enigne compartment. The you will install a jumper from pin c to pin e.(you leave the 85-89 ESA module unplugged the 90 has ESC built in the ECM) This gives a direct line from the ECM to the knocker.
With this setup you will need no new wires running thru the firewall.
Hope this helps

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85 vette,383,miniram,ZF6,4.10's..best ET 11.66@1187.00 60' 1.62
w/100HP nirous 11.05@127
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