Mass air conversion issues

Topic: Mass air conversion issues (Read 2410 times) previous topic - next topic

Mass air conversion issues

Reply #15 – March 09, 2010, 07:27:44 PM

Check your grounds, and the Power relay by the ECU. It sounds like your computer may not be turning on at all. Make sure you have the ground lug that attaches right at the ECU is good and sung, and it wouldn't hurt to run a resistance check from the neg battery post to the ground lug.

If thats all nice an snug, see if the computer is supplying 12v on the fuel pump line at the ecu connector when you first turn on the car.

When I did my swap. I "tested" to see if the computer was working by popping up the distributor out of the block (so it would clear the cam but still touched the block-IMPORTANT). Then I rotated the cam button and listened for the (injector fire, then plug fire) of each cylinder. I would check your grounds first. Mine works fine without the FPM line.
-Z

Mass air conversion issues

Reply #16 – March 09, 2010, 07:35:59 PM

Check that last post of mine. I was looking at the eec connecter backwards, all needed wires are present. Its an 89 harness from, god knows what. into my 88 convertible. Should I tap into these wires or is it already plug and play. Which explains why I haven't pulled a code 96 yet. Least not on a fresh koeo or koer.

Mass air conversion issues

Reply #17 – March 09, 2010, 07:44:14 PM

Also as well, Failed to mention... duh. Theres no EGR in this car. Valve is blocked off and gone. Thermactor and smog is idios too. The harness are just hanging. Should I least leave the egr sensor hanging? Least it'll pick it up as WOT the whole time. It was my previous understanding that if the sensor is gone and there is circuit failure of EGR, that the mass air ecu doesn't put it into calculation. Or is it still trying too? I really need a ecu guru, someone whos tuned these things before. Cus a tweecer I think is next before the blower goes in.

Mass air conversion issues

Reply #18 – March 09, 2010, 07:52:27 PM

The FPM nor the speed sensor have diddly to do with the FP relay kicking in... You need to do some real troubleshooting with a test light at pin 22 of the EEC to see if there is a signal being fed to the relay...

Also you can ground the tan/green wire in the EEC test plug, if wiring, relay and pump are OK, pump will run even with the EEC tossed out into the street...

Mass air conversion issues

Reply #19 – March 10, 2010, 03:00:49 PM

Well... I'm wondering where the chassis' FP/FPM2/VSS wires hook up into the EEC harness. I'm gonna start tracing and see what the deal is. I can't find my friggin multimeter anywhere now that I need it. I did find a black/Orange wire on the chassis harness near the eec test port where the two mate together. This black/orange wire ran into my SD harness on the eec test port, atm its just chillin there loose. Not sure what this guy does or if its related. Also my EGR question still goes unanswered, the sensor is in a box in the garage, should I hook it up and let it hang at least or leave it with an egr circuit failure code. Not sure if the A9P calculates this or not when its not present. Due to this being intermittant I'm starting to wonder if I bought a bad eec.

Mass air conversion issues

Reply #20 – March 11, 2010, 07:13:26 PM

EGR has nothing to do with the FP relay operation either...

Mass air conversion issues

Reply #21 – March 12, 2010, 02:55:46 PM

rofl so as I'm hitting my head wondering wtf is wrong with this car. I'm following all sorts of wires with the key on. And then it happens! BEHOLD! I touch the eec power feed wire at the solenoid, and the whole car just reboots. touch it again, restarts again. just the slightest motion triggered it. So I cut the wire back, recrimped and hooked it back up. Haven't had a problem since. Also checked every ground and adjusted everything else. So far its still running. The wire previously had what appeared to be a nicely done shrink tubed crimp. but evidently I was wrong. I'll keep everyone posted if the car dies out again. I do experience some stalling to a stop issues. I suspect thats vss playing its part. Its a non-cruise car so I don't think I even have the sensor. We'll see as time goes on.

Mass air conversion issues

Reply #22 – March 30, 2010, 10:05:53 PM

Gotta love the electrical gremlins..... Congrats on the fix.

Mass air conversion issues

Reply #23 – April 01, 2010, 12:29:45 AM

I was close. Good work.

Mass air conversion issues

Reply #24 – April 03, 2010, 10:39:37 AM

Quote from: Xtremitie;313385

Cus a tweecer I think is next before the blower goes in.

I may soon have one for sale

Mass air conversion issues

Reply #25 – April 03, 2010, 11:29:45 AM

Quote from: Xtremitie;313869

I do experience some stalling to a stop issues. I suspect thats vss playing its part. Its a non-cruise car so I don't think I even have the sensor.

I had this problem on my V8. I had cleaned and oiled and disassembled my IAC about 4 times. The car would run great but would have idle fluctuations and whenever I came to a stop, it would almost stall, sometimes it would. I reset my base idle about a dozen times.

I finally broke down and replaced the IAC with a brand new one. It runs like a sewing machine now. I guess the old IAC was still sticking.

-Z

Mass air conversion issues

Reply #26 – April 03, 2010, 11:45:03 AM

Agreed the iac should be checked 1st.

Hooking up the vss wires would be a good idea. It might help correct a stall on decel and if you ever log with a tweecer you will be able to see your speed which is helpful.

Glad you found the main wiring issue!

Mass air conversion issues

Reply #27 – April 03, 2010, 12:03:19 PM

Is the IAC on a 2.3 the same as the 5.0