Link IAT-sensor issues - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to   Members

ECUs and Tuning Discuss Engine Management, Tuning, & Programming

LinkBack Thread Tools Search this Thread
Old 11-12-2009, 05:38 AM   #1
Thread Starter
Join Date: Nov 2009
Location: Stuttgart, Germany
Posts: 6
Total Cats: 0
Default Link IAT-sensor issues

Hey guys,

just registered a few days ago and here comes my first problem - should I re-consider signing up at this board ;-)

I have an issue with my 1992 FM2 with a Link ECU. Sometimes, my Intake Air Temperature reading on the link keypad showes 100 C. The ECU won't let the engine go into bosst as a precaution, of course. Two days ago, I thought, I found the reason in a bad sensor ground on the IAT sensor. So I replaced the ground wire and terminal, cleaned the contact spots and it worked for one single day. Again, I have the same problem. Sometimes everything is good when I start the engine. Later, the IAT reading would go to 100 C again when I hit more then 4k rpm for example. And sometimes the reading shows 100 C already when I start up the engine. I have already been trying different spots to ground the sensor cable but nothing would improve the situation. So much about explaining my situation - I hope my english is good enough to explain to you what's going on ;-)

So my questions would be

1. Could this be a bad sensor? B/C sometimes it reads right and sometimes not - maybe vibration issue?

2. If it's not the sensor, what could I do? Run a new wire from the sensor to the ECU, I guess? Or is the grounding point on the intake manifold just a bad idea? I don't think so, since it has been working there for quite a while.

Thanks for your advice!

Take care
MiataManiac is offline   Reply With Quote
Old 11-12-2009, 06:36 AM   #2
Junior Member
Join Date: Feb 2005
Posts: 65
Total Cats: 0

G'day from Downunder Axel,

I had a similar problem with my FM/Link ECU. It was a bad earth. I just had a read of the ECU tuning manual, and as you have already said a badconnection will casue a reading off 100c and reduce boost. If it is not the earth connection then check that you have a good connection at the ECU end. Also check that the solders at the IAT sensor are not cracked or broken.

Worst case is that you may need a new IAT sensor, not sure if FM still sell them or if there is another type you can use with the FM/Link ECU.

Good Luck.

Juffa is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Raleigh: Fiberglass headlight scope, 1.6L ECU, AFM, Hardtop latches, more bigmackloud Miata parts for sale/trade 13 09-22-2017 01:34 PM
Bizarre connection issue? nick470 MEGAsquirt 1 09-30-2015 11:32 PM
Odd Steering issue interestedofold Suspension, Brakes, Drivetrain 5 09-29-2015 02:42 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 08:05 PM.