Welcome to the all new Geo Metro Forum. We hope you enjoy your visit.You're currently viewing our forum as a guest. This means you are limited to certain areas of the board and there are features you can't use and images you can't see. Registration is simple, fast, and completely free. If you're already a member please log in to your account to access all of our features: Join our community! |
| IAT #23 and hard mis at speed | |
|---|---|
| Tweet Topic Started: Aug 30 2012, 07:43 PM (1,263 Views) | |
| Larryz260 | Aug 30 2012, 07:43 PM Post #1 |
|
Fresh Fish
![]() ![]() ![]()
|
Hi all I'm new to this site and have found alot of info here. I'm also new to metro's. Today on my way home on the freeway it started missing real hard like it was turning on and off real fast, at that point the check engine light came on. When I slowed down it stopped but as soon as I got back on the gas it started again. When I got home I checked the code and it came up IAT#23. Would that cause all that. What do you all think . Thanks Larry G. |
![]() |
|
| Larryz260 | Sep 2 2012, 09:41 AM Post #2 |
|
Fresh Fish
![]() ![]() ![]()
|
I thought someone mite have an idea by now. please alittle help here |
![]() |
|
| Memphis metro | Sep 2 2012, 09:57 AM Post #3 |
![]()
|
Have you checked the connector plug to the sensor? Its located in the airfilter housing. When is the last time you did a tuneup of new spark plugs, plug wires, distributor cap and rotor? I would consider a engine compression test as well if you never have had one done. The car is getting some age on it, if you never have had any major engine work done on it. The tuneup and compression has a lot to do with how it runs. Make sure those are right first then proceed to locate any other causes of engine troubles. |
![]() |
|
| clarkdw | Sep 2 2012, 11:47 AM Post #4 |
![]()
|
Welcome Larryz260. What BR said and also |
![]() |
|
| Memphis metro | Sep 2 2012, 01:26 PM Post #5 |
![]()
|
As for testing your iat sensor. Heres how. Set your digital multimeter to ohms on the 20000 ohm scale and connect leads to the two terminals of the sensor located in the airfilter housing. Record the reading. The reading is based on degrees of current temperature. This one is tested and the current temperature is 90 degrees outside. Thus the reading of 1517 ohms on the meter is concurrent with the temperature based on the diagnostic scale of readings given. Post your reading and temperature and I can tell you if your sensor is good or not according to resistance testing results.
|
![]() |
|
| Larryz260 | Sep 2 2012, 06:13 PM Post #6 |
|
Fresh Fish
![]() ![]() ![]()
|
thanks for info. I just gave it a good tune up, plugs, cap, roter, wires and checked compresion it was around 132,135, 129. It acks like a pluged fuel filter. I have got a new one and put it on, the one that was in it looked like factory. I just got the car it has 151k on it, but it does run very good untill it does its thing. I will do the test on the sensor later to day and will post when I get done. I have not got to drive it since I put the fuel filter in it but will let you all know how it goes. Thanks |
![]() |
|
| clarkdw | Sep 2 2012, 09:44 PM Post #7 |
![]()
|
Are your compression numbers with wide open throttle? For comparison of numbers it is done with wide open throttle. 199 is considered normal and 156 is the minimum acceptable according to the Factory service manual. |
![]() |
|
| Memphis metro | Sep 2 2012, 10:10 PM Post #8 |
![]()
|
How did the spark plugs look? Any oily? Those compression numbers are low but since you tuned it up, that should allow you to get the most out of it for awhile. Accelerator to the floor when checking compression. |
![]() |
|
| Vkhelldog | Nov 13 2012, 01:47 PM Post #9 |
![]() ![]()
|
This is my test on my iat sensor, it's 35 degrees Fahrenheit... It's bad eh? http://s1341.photobucket.com/albums/o741/Vkhelldog/?action=view¤t=C57CEB2B-144C-4417-9061-C943BCAFDBC7-15771-00000C086F0AEEB2_zps3bbfae93.jpg. Ty in advance |
![]() |
|
| Memphis metro | Nov 13 2012, 02:06 PM Post #10 |
![]()
|
At that temperature you should be reading between 5000 and 6000 ohms. Was your check engine light on for iat code? |
![]() |
|
| wizard 03 | Nov 14 2012, 03:48 PM Post #11 |
![]()
|
Imstead of plugging in a DVM, I would suggest waiting for it to freak out again, and then just unplug it. If the engine smooths back out, its the IAT sensor. If nothing changes or it get really weird and intermitten, it could be a wireing problem. |
![]() |
|
| 1 user reading this topic (1 Guest and 0 Anonymous) | |
| « Previous Topic · Engine Tech & Diagnostics · Next Topic » |


Welcome to the all new Geo Metro Forum. We hope you enjoy your visit.


![]](http://z3.ifrm.com/static/1/pip_r.png)






3:18 AM Jul 11