KLZE swap DIAG Connector?

[qcook]

Before you start reading:

I am a 3rd year apprentice automotive technition and have done my homework.
I know there are many knowledgable and intelligent peopl here.
Any help would be greatly appreciated.


I have a KLZE in my 1992 MX3. The swap was done aprox 2 years ago, i ran my KL31 ECU and JE-50 MAF with poor drivability. There vehicle ran terribly rich(10.1:1 on 5gas analyzer), fouled plugs, bad fuel economy, intermitant stall issues. I Purchased a KL36, installed, and the car ran considerably better in all aspects.

Ther intermitant stall issue was fixed with IAC assembly, but now the vehicle will not idle below 1000RPM. (I have adjusted it at the TB but anything below 1000 wants to stall) Thourhgly checked for vacuum leaks, none. HELP?

The diagnosis connector located in the engine compartment next to the battery also gives touble. When i go adjust base timing: MY COOLING FAN INSTANTY COMES ON AND THE ENGINE STALLS WTF???? Is this a grelim which requires diag, or r the pinouts different between ECUS??

I have wiring diagrams infront of me. 1996 mx-6 (for the engine ecu) 1992 mx3 gs ( for the stock harness/vehicle/diag port) And there not idicating what the Ports doo?

Kind of lost

any help would be appreciated

[mikeinaus]

the high idle could be related to a bad coolant sensor or a clogged iac, or possibly misadjusted tps. the fact you have the idle set as low as possible means something is off with one of the imputs. try unplugging the coolant sensor and readjusting the throttle. are you getting any codes?

you said you have a ecu pinout for a 96 and are trying to relate it to a 92? in 96 the cars switched to obd2 so the wiring would be completely different then a 92. http://www.mx-3.com/manuals/index.php should help you with wiring diagrams

are you asking what pins do what in the diagnostic connector? i believe they changed between the years, the best thing to do would be to look under the cap of the diag box. assuming you still have one. if yours is missing let me know and i can take a pic of the one in my parts car and upload it for you, its also a 92 gs...

[Daninski]

The throttle body idle adjustment is done on the screw on top of the TB right and 3 - 3.5 turns out is ballpark just for conversation state. The allen screw on the front bottom of the TB is not suppose to be touched, it's factory set. Finally the TPS must be adjusted and that takes about 20mins to half an hour with a feeler gauge and ohm meter. I'll post the procedure link in just one minute. Now make sure you have no vacuum leaks, you can do that using brake cleaner or gas from your oxy/acyt torch. Check the entire intake and where the intake meets the heads.
How new are your oxygen sensors and is there a possibility your cat is plugged? My 5c

Oh ya, if there is any trapped air in the system the IAC is at the top of the loop so air there will cause high idle. I squeeze the bejesus out of the hose to purge any air from the system. +5c worth

[qcook]

Okay. Thanks guys.

I will start with your sugestions:
-Coolant temp sensore
-I will clean the IAC
-Look for possible Intake leaks
-The O2 sensor is old, will replace as maintenain item

Sorry typo earlier I have 1995 and 1996 diagrams. I am looking at the 1995 diagram, and am aware of ODB2 and the complexity added.

The cat I am assuming is plugged ( will confirm with a back pressure test). Im going on the assumption that it was running dirt rich for an extended period of time.
Cheers

[Daninski]

Yes and as you know a rich running engine will eventually destroy your cat.

[qcook]

Also I forgot to mention. I havnt seen a MIL ever since i put the KL36 in. I think that I would have had to have seen it when the engine was misfiring (open in an ignition wire). No EGR or Cat codes either (although im not sure wed see one on an OBD1 system?)

[Ryan]

I'm sorry I don't have time to read more thoroughly, but I did not see you recognize it when Mike and Dan mentioned it.



The cooling fan coming on is a trick that we use to set the TPS. Normally, with the idle switch closed, the fan is off. As soon as the idle switch is opened, the fan comes on. Neat built in feature. Its basically giving you a continuity signal for ease of TPS adjustment.

So since your fan comes on instantly leads me to think that your idle switch is perhaps reading open all the time, which would also cause your idle issues.

I'd check your TPS adjustment.

Replying to your last post, The KL36 is a Jspec ECM designed for the Jspec motors which did not have an EGR. Hence no code. There is no post cat O2 on these, OBDI, so no cat codes either. Also, no lame "random cyl misfire" code. Useless code anyway, don't need a code to tell me that.


Ryan