sileight_04
03-28-2008, 01:13 AM
Let me first start by apologizing if this is something that has been brought up before. I did use the search to the best of my search abilities and also have read a couple hundred pages into the tech section with no luck. =(
first off this is my 3rd 240sx, this one being a 93 KA24DE. I purchased it from the original owners. This is the only one that has had a KA in it for more than a few weeks, so my knowledge of the ka is not plentiful. The original owners did have the motor rebuilt a little over 10k ago with receipts.
Now on to the issue(s).
1. The car refuses to idle decently, seemed as if it was suffering from a dirty iac and was in need of a tune up and maybe a missfire. it fluctuates and like to stay about 1k for a while. it seems to also throw timing around a lot. I cleaned the Iac and replaced the plugs, wires, rotor and cap, as well as your other tune up items. It still idles terribly.
2. here is the part that i can't even begin to wrap my head around... It starts up and idles (bad, but it idles and drives) While driving or just free reving, it will just drop the revs and then try to go back up and then drop them again and so on and so on all while still having the throttle applied. this usually happens after driving the car around for 10-15 minutes and/or normally between 2k-5k rpm. It doesn't always happen in a certain amount of time but does every time the car is driven. it is bad enough to where it becomes un drivable. I have no idea what it could be, it didn't happen for the first day or two after the car was bought and the stuff listed above was done after it all started. I have thought of it maybe being off on ignition timing so i restabbed the distributor, still happens. checked to see if injectors are clicking away and when pulled create a stumble. has spark.
I am really at a loss of what to do, Ive read through the FSM rigorously with no positive outcome pertaining to this. I would greatly appreciate any and all help! if this has been brought up and you know where its at, point me in the right direction. Please help me out as best you guys can.
Thank you for your time,
Jonathan
first off this is my 3rd 240sx, this one being a 93 KA24DE. I purchased it from the original owners. This is the only one that has had a KA in it for more than a few weeks, so my knowledge of the ka is not plentiful. The original owners did have the motor rebuilt a little over 10k ago with receipts.
Now on to the issue(s).
1. The car refuses to idle decently, seemed as if it was suffering from a dirty iac and was in need of a tune up and maybe a missfire. it fluctuates and like to stay about 1k for a while. it seems to also throw timing around a lot. I cleaned the Iac and replaced the plugs, wires, rotor and cap, as well as your other tune up items. It still idles terribly.
2. here is the part that i can't even begin to wrap my head around... It starts up and idles (bad, but it idles and drives) While driving or just free reving, it will just drop the revs and then try to go back up and then drop them again and so on and so on all while still having the throttle applied. this usually happens after driving the car around for 10-15 minutes and/or normally between 2k-5k rpm. It doesn't always happen in a certain amount of time but does every time the car is driven. it is bad enough to where it becomes un drivable. I have no idea what it could be, it didn't happen for the first day or two after the car was bought and the stuff listed above was done after it all started. I have thought of it maybe being off on ignition timing so i restabbed the distributor, still happens. checked to see if injectors are clicking away and when pulled create a stumble. has spark.
I am really at a loss of what to do, Ive read through the FSM rigorously with no positive outcome pertaining to this. I would greatly appreciate any and all help! if this has been brought up and you know where its at, point me in the right direction. Please help me out as best you guys can.
Thank you for your time,
Jonathan