How NOT to install your AEM wideband with MSPNP and other suprises - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MSPNP MSPNP specific Megasquirt related discussion.

Reply
 
 
 
LinkBack Thread Tools
Old 03-07-2010, 11:08 PM   #1
Junior Member
Thread Starter
 
Join Date: Dec 2009
Location: Shelbina, MO (North East)
Posts: 335
Total Cats: 0
Default How NOT to install your AEM wideband with MSPNP and other suprises

And how to fix someone else's mess.... post purchase....

I first started to have electrical concerns when I was on the way home with this car, but I thought it might have been isolated to a rushed amp install. I found vampire clips (skotch-locs) on the power wire from the power antenna to power the amp, which was going on and off at random times during the trip. No biggie it's just the radio....

Then I noticed one on an unused wire in the engine compartment that had been used to power the EBC that was not installed. That was the start of my real concerns. Seemed to like these clips....

As most of you know if you have read the "How to use AEM with Volts in MS" thread that mine has never read correctly. Yesterday after an auto-x practice 3 hours from my house, it quit working on the way home. I had VE tuned all the way there and also during auto-x runs. I noticed the AEM was stuck between 15.3-15.7 and would only rarely move anywhere else. Today would be tear down day.

I started with the wideband plug under the car. Pulled up the interior, shifter, dash, etc. Found the wideband connector inside the shifter tunnel had started to come apart. A couple of zip ties later and a hole poked in the shifter boot (so the wires were not squished again) and all was working, but what about this darn AFR reading difference? The AFR reading always seemed noisy and erratic even when the engine was not running and the AEM was warming up. I decided it was time to dig into the dash. HOLY CRAP. Found a mess of wires. I left the stereo alone, but it is working fine and likely will, it's just not pretty. The wideband harness had a big section with tape on it so that had to be removed for inspection. Luckily just the outer cover was melted and no other items were hurt. Then came the ECM harness. I pulled up the carpet behind the seat and found this.





I got out the Haynes manual to see what the damage was and I was suprised (not) to find that the wires effected were all the injectors, power, ground, and CAS. The CAS wire (white) had 3 butt connectors and 2 wire splices. There was also an extra ground that grounded the sensor ground to the chassis ground. I think that is a big no-no. When I wiggled that ground the reading from the AEM would change.

This picture is to show what vampire clips do to wires and why you NEVER use them. This is the main sensor ground. It was almost cut in half.



Nothing a little solder can't fix, but they didn't leave me a lot to work with. I didn't change the injector wires, and I likely will soon, but they were in good shape. Two connections were a little loose, so I cut back the butt connector insulation and soldered the wires into the connector. If there is reason to be concerned let me know and I will tear back into it. I was running out of daylight and time.

Is there a problem with this? It shows it is a MSPNP 96-97. My car is a 95. Seems to be working ok, but are there other issues I should know about?




Re-installed everything and tried it out. It all works perfectly.

Video

I tried to upload to YouTube, but I fail...

Is this the famous knock sensing oil pressure gauge? Looked like it jumps when I star to ease out of the throttle. I think my timing map is probably too agressive near 100-130 KPa. Someone have a known good ignition map for a stock 1.8 on a log manifold? I think the rest is ok, but I've noticed this gauge do this before and I was now concerned.

Gauge wiggle


I decided to go for a tune run and one of my many assistants decided she wanted to go. I guess I'm pretty boring, or these kids are just used to my driving.




Thanks for any feedback! I can get a screen shot or something of the ignition map if needed. The MSQ is on a laptop.
rweatherford is offline   Reply With Quote
Old 03-08-2010, 10:35 AM   #2
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

All this stuff looks like a recipe for success.
hustler is offline   Reply With Quote
Old 03-09-2010, 09:29 PM   #3
Junior Member
Thread Starter
 
Join Date: Dec 2009
Location: Shelbina, MO (North East)
Posts: 335
Total Cats: 0
Default

YAY I don't fail... Just had my security setting set so high I could never log into YouTube. The redirects just were in an endless loop so I was giving up.


Last edited by rweatherford; 03-09-2010 at 09:41 PM.
rweatherford is offline   Reply With Quote
Old 03-09-2010, 09:41 PM   #4
Junior Member
Thread Starter
 
Join Date: Dec 2009
Location: Shelbina, MO (North East)
Posts: 335
Total Cats: 0
Default Oil Pressure gauge wiggle

Here is the Oil Pressure gauge wiggle when I lift out of boost. Is this normal?

rweatherford is offline   Reply With Quote
Old 03-09-2010, 09:51 PM   #5
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,105
Total Cats: 518
Default

"the video you requested is not available"

I might be clicking too soon, its only been 10 minutes since you posted it. What's it doing, jumping? I don't think that's normal.
curly is online now   Reply With Quote
Old 03-09-2010, 10:03 PM   #6
Junior Member
Thread Starter
 
Join Date: Dec 2009
Location: Shelbina, MO (North East)
Posts: 335
Total Cats: 0
Default

Try again. It was processing.
rweatherford is offline   Reply With Quote
Old 03-09-2010, 10:13 PM   #7
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,105
Total Cats: 518
Default

"This is a private video. If you have been sent this video, please be sure to accept the sender's friend request."
curly is online now   Reply With Quote
Old 03-09-2010, 10:22 PM   #8
Junior Member
Thread Starter
 
Join Date: Dec 2009
Location: Shelbina, MO (North East)
Posts: 335
Total Cats: 0
Default

Sorry... Hang on.
rweatherford is offline   Reply With Quote
Old 03-09-2010, 10:24 PM   #9
Junior Member
Thread Starter
 
Join Date: Dec 2009
Location: Shelbina, MO (North East)
Posts: 335
Total Cats: 0
Default

Should work now... YouTube
rweatherford is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Walbro 255lph Fuel Pump $50 lsc224 Miata parts for sale/trade 2 10-01-2015 10:17 AM
wiring wideband ground to battery terminal btabor ECUs and Tuning 10 09-28-2015 06:33 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 02:42 AM.