Ryan@CiNcity Posted April 29, 2009 Report Share Posted April 29, 2009 my KA is running really really rich. if im at WOT and keep it there into the higher RPMs it hits some sort of fuel cut. now im not 100% sure that is what is happening but thats the best i can come up with. i used to hit fuel cut in my DSM but that was like hitting a brick wall it was so rough. with my KA its more like hitting a speed limiter in a new pickup. it cuts all power for a few seconds then it comes back to life and its fine. but it smells like alot of fuel...... thats why im not sure its fuel cut..... anyways im looking for some info on my problem and i have a few ideas to try out, so any more would be great. my main one is that im running an automatic ECU in my 5spd.... how big of a deal is this? im looking for a 5spd ECU at the moment but was wondering if i need to stay with a SOHC ECU or if i can upgrade to a newer one....or if there is even any benefit to doing so. Thanks Quote Link to comment
nis720 Posted April 29, 2009 Report Share Posted April 29, 2009 Do you have any pics? Do you have the MAF sensor hooked up? The auto ECU is actually better, because the 5 speed ECU has a limiter on it Quote Link to comment
nis720 Posted April 29, 2009 Report Share Posted April 29, 2009 BTW you cannot use DOHC ECU on a SOHC motor. SOHC is 8 bit and dual cam ECU is 16 bit Quote Link to comment
napz510 Posted April 29, 2009 Report Share Posted April 29, 2009 What do you have a Ka24e or Ka24de set up? And I think using auto ecu won't read the 5 spd tps., you can't adjust the tps correctly But it's still gonna work. Quote Link to comment
Ryan@CiNcity Posted April 29, 2009 Author Report Share Posted April 29, 2009 (edited) i have the SOHC ka. you wanting pics of the car or a video of the problem? i could probably get a video but it wouldnt be till the weekend. pics of the car though i have alot. the maf is hooked up and one of my buddies believes the problem is with the maf. he suggested unplugging it and running the car to see if it creates the same problem but the car went into limp mode so that didnt work. and the auto is better? this limiter im assuming is a speed limiter? does that apply to the motor specifically or just if the motor was still in a 240? i should also mention im new to both datsuns and 240 motors. i just got rid of my DSM's a year or so ago, so i still have alot to learn. EDIT: i just made a project thread so here is the link to that if you wanna check it out...... http://forum.ratsun.net/showthread.php?t=11588 Edited April 29, 2009 by Ryan@CiNcity Quote Link to comment
Icehouse Posted April 29, 2009 Report Share Posted April 29, 2009 You have to have a number 11 ECU. All the rest of the single cam ones cut out. That is your reving problem, I'm not sure why it's running rich. There are a few things that could do this. TPS, MAF, temp sensor are a few things to check. Quote Link to comment
Ryan@CiNcity Posted April 29, 2009 Author Report Share Posted April 29, 2009 You have to have a number 11 ECU. All the rest of the single cam ones cut out. you sir are a genius!! i have a 10 in my car now...... i will have to look for a 11 now. what are they out of (year? 89-90?) Quote Link to comment
nis720 Posted April 29, 2009 Report Share Posted April 29, 2009 you sir are a genius!! i have a 10 in my car now...... i will have to look for a 11 now. what are they out of (year? 89-90?) The number 10 is the 5 speed.. it should still work but will only cut out in 5th gear at around 3500 rpm. (I've tried different ECU's auto and 5speed and they all work). I'm thinking it's the MAF, because the one time I unplugged it and tried to run it it did the same thing you described. Quote Link to comment
Icehouse Posted April 29, 2009 Report Share Posted April 29, 2009 The number 10 is the 5 speed.. it should still work but will only cut out in 5th gear at around 3500 rpm. (I've tried different ECU's auto and 5speed and they all work). I'm thinking it's the MAF, because the one time I unplugged it and tried to run it it did the same thing you described. When they are wired into a 510 all the single cam ecu's cut at around 4500ish except the 11. I looked on every sight I could find, read every diagram, and still couldn't see any "extra" wiring, or any differences. So I just gave up and make sure if I do a single cam swap I get an 11 ECU. I would try cleaning the MAF as well though, that never hurts. I think the running rich and high RPM cut are 2 separate problems. Single cams tend to run rich from my experience as well. Quote Link to comment
Ryan@CiNcity Posted April 30, 2009 Author Report Share Posted April 30, 2009 yeah i believe now too that there are 2 sep. problems. but my biggest one was the cutting out issue. its super annoying when merging onto the interstate and like you said hitting 4500 or so and it cutting out. it was really wierd too cause it only happened in 4th and 5th i think. i could rip in 1st and 2nd and almost always in 3rd. man im glad this issue is near finished. ill be so happy. another gut was saying that the SOHC's run kinda rich in his experiance so after the cutting out issue is fixed ill tackle that and see where i get with it. Quote Link to comment
nis720 Posted April 30, 2009 Report Share Posted April 30, 2009 now that you mention it, mine would cut off at 4500 RPM. Another thing I noticed with the ECUs is the timing has to be set when you swap ECUs... The auto one is different. Quote Link to comment
Ryan@CiNcity Posted April 30, 2009 Author Report Share Posted April 30, 2009 sweet! im so excited to get this fixed!! Quote Link to comment
dat521kid Posted May 1, 2009 Report Share Posted May 1, 2009 from what my homie told me, you have to run the speedo cable to the 240sx speedometer thingy.. he said you unbolt (4) screws and take it out and connect the both and you shouldnt get the cut off anymore Quote Link to comment
Ryan@CiNcity Posted May 2, 2009 Author Report Share Posted May 2, 2009 http://jimwolftechnology.com/wolfpdf/ECU-ID.PDF so i got a guy that has 2 ECUs for sale and neither are #11...... is #11 the ONLY ones that will work? i looked these numbers up on that link posted above and i realized i really dont know what numbers will fix my problem and what numbers wont. here are the numbers if anyone that knows more than me can figure it out. #14 (manual) a11-b13 g58 9201 #15 (auto) a11-b18 g14 0z21 Quote Link to comment
Icehouse Posted May 2, 2009 Report Share Posted May 2, 2009 Trust me guys I've wired TO many KA's and know that only the 11 will work with the single cam engine. I've tried all the other ones and the problem is still there. I couldn't find a straight answer anywhere so I gave up. I also noticed that the cutting out problem was worse in the higher gears which is weird because I never wire up any of the tranny sensor besides the back up lights. No other engine has that problem.... Who knows.... Quote Link to comment
dat521kid Posted May 2, 2009 Report Share Posted May 2, 2009 http://jimwolftechnology.com/wolfpdf/ECU-ID.PDF so i got a guy that has 2 ECUs for sale and neither are #11...... is #11 the ONLY ones that will work? i looked these numbers up on that link posted above and i realized i really dont know what numbers will fix my problem and what numbers wont. here are the numbers if anyone that knows more than me can figure it out. #14 (manual) a11-b13 g58 9201 #15 (auto) a11-b18 g14 0z21 i think i saw one on ebay Quote Link to comment
Ryan@CiNcity Posted May 2, 2009 Author Report Share Posted May 2, 2009 yeah i believe you i was just curious what the #11 stood for and if anything else worked. yeah ill keep looking on ebay. and did they make #11 ECUs in auto and manual? Quote Link to comment
Ryan@CiNcity Posted May 14, 2009 Author Report Share Posted May 14, 2009 well i got the ECU switched out and it runs like a dream through all gears!!!! AWESOME AND THANKS GUYS!! Quote Link to comment
dat521kid Posted May 14, 2009 Report Share Posted May 14, 2009 well i got the ECU switched out and it runs like a dream through all gears!!!! AWESOME AND THANKS GUYS!! which one did you end up getting? Quote Link to comment
Ryan@CiNcity Posted May 14, 2009 Author Report Share Posted May 14, 2009 one with a big #11 on it. and its an auto..... seems to work great. Quote Link to comment
dat521kid Posted May 14, 2009 Report Share Posted May 14, 2009 one with a big #11 on it. and its an auto..... seems to work great. ebay? how much? Quote Link to comment
240ADAM Posted May 14, 2009 Report Share Posted May 14, 2009 You have to have a number 11 ECU. All the rest of the single cam ones cut out. That is your reving problem, I'm not sure why it's running rich. There are a few things that could do this. TPS, MAF, temp sensor are a few things to check. Yeah don't take all the credit for that one Jeff, whos the one that figured that out???? Quote Link to comment
dimedriver Posted May 15, 2009 Report Share Posted May 15, 2009 Hey just of information, what maf are you running? Is it metal or plastic and does it have a number on the side like N-60 or N-62? N-60 is from a maxima and the N-62 is from the Z32. I don't recall what the stock ka maf was I just remember its metal and has a really low flow rate. Also do you have the speed sensor hooked up to the transmission/speedo cable? I bet there is another way round this than the must use #11 ECU in a 510. I bet its ether the speedo cable thing or the swap had the wrong MAF/ECU combo I can make a chip for those ECU's with no speed limit or rev limit. Which would fix the falling on its face at speed problem. The blank chips are getting a little hard to find these days though. -Avery Quote Link to comment
Icehouse Posted May 15, 2009 Report Share Posted May 15, 2009 Yeah don't take all the credit for that one Jeff, whos the one that figured that out???? Haha okay if yours didn't run like shit we would have never figured it out :D haha :D I'll give you the credit if you get me the CV shaft off that Z!! :D Quote Link to comment
240ADAM Posted May 16, 2009 Report Share Posted May 16, 2009 Haha okay if yours didn't run like shit we would have never figured it out :D haha :D I'll give you the credit if you get me the CV shaft off that Z!! :D Ok ok I used your computer in my car so WE figured it out, you'll get it sooner or later, you know how I am! Quote Link to comment
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