MX-3.com

ok so i have 2 problems.... first, my 94 mx3 runs good while im driving, but as soon as im idling at a stop light it drops to about 500rpm and then dies, what could be the problem? and how could i fix it?
second, my check engine light stays on until im riding high rpms... what could the problem be and how could i fix this?
any ideas could help at this point

---------------------------------------------------------------------------------------------------------------------
i just got this car about 3 days ago and i want to make it into something that doesn't suck my nob, but i need to fix the minor problems first...

If you haven't checked engine codes I suggest doing so now:

1. Make sure car is off
2. Locate the Diagnostic box in the engine bay
3. Using a paper clip, connect TEN and GND
4. Turn Ignition to ON, do NOT start engine.
5. Watch Check engine light for codes.
6. Compare codes to the ones in the online manual
7. ????????
8. PROFIT

thx do u have any answers for the idle problem?

It could be that the idle screw is set too low or you might have a slight vacuum leak in your intake. The idle screw is near the top of your throttlebody, just give it a turn and you can raise your idle.

we are trying to give you an answer. Check your codes, then let us know what they are, if any.
Once we have an idea what the ecu is saying, we can further help you with your idle problem.
Help us help you, please.

thank you i will try it and get back to you guys...

SuperK wrote:Help us help you

Show me the kwaun...

ok so my check engine light came on because of my valve positioning sensor... where might i find that? and how can i fix this problem?

what code are you getting? I looked up the codes in the book, there's a throttle position sensor, which is my guess, code 12

If it's the Throttle Position sensor, might as well check it anyways, here's how to diag it:

1. Detach the connector from the throttle position sensor.
2. Connect an ohmmeter between terminals IDL and E.

(these are pins 3 and 4, if you look at the plug from top to bottom... bottom being the last)
3. insert a .004 in (0.1mm) feeler gauge between the throttle stop screw and stop lever
4. verify there's continuity between terminals IDL and E
5. then replaced the feeler gauge with a .027in (.7mm) feeler gauge, verify there is no continuity between terminals IDL and E
6. Then open the throttle wide and verify there is no continuity again between terminals IDL and E.

(courtesy of Chiltons)

You can unscrew your TPS (throttle position sensor) and turn it up or down to adjust it.
Once it's in spec (according to the directions) you're golden. If it's impossible to put it in spec, you'll have to replace your TPS. There are several who have one for sale, including me.

no i got 16...

Code 16 is the EGR Valve position sensor. Section F1 page 091 gives you the procedure for diagnosing that code.

http://www.mx-3.com/manuals/showimg.php ... F1-091.gif" onclick="window.open(this.href);return false;

Damn you EGR!!!

is it a b---- to fix or something?

Inside joke. Just follow the instruction in the manual that I posted and you should be able to zero in on the problem.