96 Ka24de Problem!!!

new_to_drift · 06-19-2006, 08:49 PM

i swapped a 96 KA24DE into my 89 coupe, and I have a feeling that the person that did my harness/wiring messed up,but i want some help figuring out what else/if there are any other possibilities? My problem is that once my car is warmed up, it is extremely boggy.For example when starting from a stop it will chug for a sec, until it gets into higher revs.And this happens in almost every gear.But when its cold,the car runs normal.I dont get it, the only thing iwas really thinking was that the MAF is wired wrong.But other than that, i have no idea.PLEASE HELP.thanks

s13/350z · 06-19-2006, 11:56 PM

the car may be changing the timing as the car warms which would cause that, let it warm up and check to make sure the timing chani is not slipping.(I forget if the 240 will *Censored**Censored**Censored**Censored**Censored* *Censored* timing automatically) Or check your spark plugs/injectors. Did you put new plugs in when u got the motor? If not thats probably causing it to stutter then wehn u pick up speed you dont notice anymore. GL.

new_to_drift · 06-20-2006, 09:41 AM

i just put new plugs and wires in about a month ago.What can i do if it is automatically screwing up the timing?

06-20-2006, 04:29 PM

did he/she swap out the ECU as well? it'll use a different fuel map from the ka24e to the de.. and the reason it runs better when it's cold is because normally when the engine is cold the ecu compensates by cranking the rpm's up to about 1500 until it's warmed up..

could be the wiring, could be the ecu, could be something with fuel delivery

new_to_drift · 06-20-2006, 10:10 PM

yes we swapped the ECU out as well.is there anyway i could check the fuel delivery?

s13/350z · 06-21-2006, 01:21 AM

maby injectors are sputtering (do you have acess to an EMS with duty cycle on it?)
If not that Im not sure(besides bad timing which on the 240 will be a total biatch) tmmrw Ill talk to "my mechanic" and ask him what he thinks it is.

akuma S14 · 06-21-2006, 08:36 AM

Quote:

Originally Posted by new_to_drift

i swapped a 96 KA24DE into my 89 coupe, and I have a feeling that the person that did my harness/wiring messed up,but i want some help figuring out what else/if there are any other possibilities? My problem is that once my car is warmed up, it is extremely boggy.For example when starting from a stop it will chug for a sec, until it gets into higher revs.And this happens in almost every gear.But when its cold,the car runs normal.I dont get it, the only thing iwas really thinking was that the MAF is wired wrong.But other than that, i have no idea.PLEASE HELP.thanks

Try to look at your thermostat it could be bad cuasing your car to think it is running cold all the time thus = boggy feeling when warm.

s13/350z · 06-21-2006, 03:30 PM

so my mechanic friend thinks that it is more than likely the MAF or the o2 sensor.
said he had the same problem on a DOHC 240 and it was the MAF

Motdyn-Ls1fd · 06-21-2006, 05:16 PM

Usually if it is the maf the car wont rev above 3k or so.

This is what your problem sounds like to me.

The previous mechanic set the timing on the car when the motor was on the cold side, and the ecu had not changed the timing/fuel maps for the normal temp range.

So basically the timing is probibly way off. Turn you car on. Let it idle up till the thermostat opens, and check the timing.

You can also code check the ecu. That will tell you if it is the maf, tps sens which it could be, or whatever else.

A 02 sens usually wont make the car do that, it will just run in open loop mode and pretty rich on the obd 1 engines.

Hope that helps out a little.

new_to_drift · 06-21-2006, 06:14 PM

it is not the thermostat.I replaced that, and both the water temp sensors.Is there any other way of checking the timing if i dont have a timing light?thanks for all the input everyone so far.

akuma S14 · 06-22-2006, 08:07 AM

Quote:

Originally Posted by new_to_drift

it is not the thermostat.I replaced that, and both the water temp sensors.Is there any other way of checking the timing if i dont have a timing light?thanks for all the input everyone so far.

Timing lights are cheap. go buy one you'll never be sorry for owning one.

s13/350z · 06-22-2006, 08:32 PM

Its The Maf!!

new_to_drift · 06-23-2006, 08:03 AM

if it is the MAF how could i check it?the ECU code?

s13/350z · 06-23-2006, 03:41 PM

ppossibly..but you need more tools! head on over to
http://www.240sxforums.com/forums/index.php

and ask those guys, they should be able to clear it up fast.

06-19-2006, 08:49 PM	#1
new_to_drift another 240 owner Join Date: Jun 2004 Location: Novi,Michigan Posts: 244	96 Ka24de Problem!!! i swapped a 96 KA24DE into my 89 coupe, and I have a feeling that the person that did my harness/wiring messed up,but i want some help figuring out what else/if there are any other possibilities? My problem is that once my car is warmed up, it is extremely boggy.For example when starting from a stop it will chug for a sec, until it gets into higher revs.And this happens in almost every gear.But when its cold,the car runs normal.I dont get it, the only thing iwas really thinking was that the MAF is wired wrong.But other than that, i have no idea.PLEASE HELP.thanks

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06-19-2006, 11:56 PM	#2
s13/350z Registered User Join Date: Dec 2003 Location: Houston, Tx Posts: 377	the car may be changing the timing as the car warms which would cause that, let it warm up and check to make sure the timing chani is not slipping.(I forget if the 240 will CensoredCensoredCensoredCensoredCensored Censored timing automatically) Or check your spark plugs/injectors. Did you put new plugs in when u got the motor? If not thats probably causing it to stutter then wehn u pick up speed you dont notice anymore. GL.

06-20-2006, 09:41 AM	#3
new_to_drift another 240 owner Join Date: Jun 2004 Location: Novi,Michigan Posts: 244	i just put new plugs and wires in about a month ago.What can i do if it is automatically screwing up the timing?

06-20-2006, 04:29 PM	#4
totoro001 Guest Posts: n/a	did he/she swap out the ECU as well? it'll use a different fuel map from the ka24e to the de.. and the reason it runs better when it's cold is because normally when the engine is cold the ecu compensates by cranking the rpm's up to about 1500 until it's warmed up.. could be the wiring, could be the ecu, could be something with fuel delivery

06-20-2006, 10:10 PM	#5
new_to_drift another 240 owner Join Date: Jun 2004 Location: Novi,Michigan Posts: 244	yes we swapped the ECU out as well.is there anyway i could check the fuel delivery?

06-21-2006, 01:21 AM	#6
s13/350z Registered User Join Date: Dec 2003 Location: Houston, Tx Posts: 377	maby injectors are sputtering (do you have acess to an EMS with duty cycle on it?) If not that Im not sure(besides bad timing which on the 240 will be a total biatch) tmmrw Ill talk to "my mechanic" and ask him what he thinks it is.

06-21-2006, 03:30 PM	#8
s13/350z Registered User Join Date: Dec 2003 Location: Houston, Tx Posts: 377	so my mechanic friend thinks that it is more than likely the MAF or the o2 sensor. said he had the same problem on a DOHC 240 and it was the MAF

06-21-2006, 05:16 PM	#9
Motdyn-Ls1fd Registered User Join Date: Oct 2005 Location: San Jose Posts: 220	Usually if it is the maf the car wont rev above 3k or so. This is what your problem sounds like to me. The previous mechanic set the timing on the car when the motor was on the cold side, and the ecu had not changed the timing/fuel maps for the normal temp range. So basically the timing is probibly way off. Turn you car on. Let it idle up till the thermostat opens, and check the timing. You can also code check the ecu. That will tell you if it is the maf, tps sens which it could be, or whatever else. A 02 sens usually wont make the car do that, it will just run in open loop mode and pretty rich on the obd 1 engines. Hope that helps out a little.

06-21-2006, 06:14 PM	#10
new_to_drift another 240 owner Join Date: Jun 2004 Location: Novi,Michigan Posts: 244	it is not the thermostat.I replaced that, and both the water temp sensors.Is there any other way of checking the timing if i dont have a timing light?thanks for all the input everyone so far.

06-22-2006, 08:32 PM	#12
s13/350z Registered User Join Date: Dec 2003 Location: Houston, Tx Posts: 377	Its The Maf!!

06-23-2006, 08:03 AM	#13
new_to_drift another 240 owner Join Date: Jun 2004 Location: Novi,Michigan Posts: 244	if it is the MAF how could i check it?the ECU code?

06-23-2006, 03:41 PM	#14
s13/350z Registered User Join Date: Dec 2003 Location: Houston, Tx Posts: 377	ppossibly..but you need more tools! head on over to http://www.240sxforums.com/forums/index.php and ask those guys, they should be able to clear it up fast.