I have a 88 CRX DX that i converted to mpfi. I orignally had a s200b on a stock LS. It ran perfect. I pulled that motor out and put in a fully built 2.0 LS. I decided to sell the s200b and run until i was able to afford a s300.
I got the s300 about 2 weeks ago. I put it in and it uploads fine. But when i try to start it, the rpm's jump everywhere from 200 rpms to 56,000rpms. The only way it keeps running is if i keep revving it up. And it barely does at that. It throws multiple ecu codes that keep changing. Even ones i have disabled.
Like I said it is a fully built 2.0 LS with 1000cc injectors. I even took out the 1000cc injectors and put in stock injectors to try a stock ecu. It ran perfect.
I tried my s300 in a friends car and it ran perfect.
I even tried using a different laptop on my car with the exact same result. The rpms were jumping all over and throwing intermitten ecu codes. Even with the car not running the ecu codes change.
WTF is going on??? I'm leaning toward a wiring issue but why would the s200b and a stock ecu run perfect? Is there a wire that I must change or insulate that the s200b and a stock ecu doesnt care about, but the s300 does? I downloaded the newer version of smanager to see if that helped, and its still the same.
WTF i'm stumped s300 acting funny wont run
J12 has been cut. And i followed all those steps besides 8. The error codes keep changing. Even ones i have disabled....such as vtec codes. And i have a non-vtec map with vtec disabled...lol
Last edited by B_Rex on Mon Sep 04, 2006 12:02 pm, edited 1 time in total.
I did have a harness. I removed it saturday and hard wired it to obd1. I used 4 different schematics to make sure everywhere was correct and intact. It took me 12 hours to do. I hooked the s300 up after ward. There was a slight change but basically the same thing.deafy wrote:Do you have an OBD0-OBD1 conversion harness and the extra wires wired up right?
I turn the key on and it reads everything fine....such as iat, ect, o2 ect. When I crank the car, they stay the same. But as soon as i let off, the rpm's, error codes and vss jump all over the place. I hit 56,000 rpms at over 20,000mph according to the s300....lol.
But anyway, I'm running out of ideas of things to try. What can i do? I figured it was my car. But i went over every wire with a fine tooth comb. And every other ecu works. The s300 works perfect in other cars....WTH.
It could be interference either from the spark plugs or a missing ground.
If possible swap to stock spark plug leads, check that the plugs are resistor type, and also check in the distributor cap that the carbon resistor has not cracked.
It sounds like you have already checked the grounds, but you can sometimes find the source of the interference by using a multimeter in AC volts setting and looking for any significant AC voltage on the power and ground wires to the ECU (there should not be more than about 0.05V AC on those wires).
If possible swap to stock spark plug leads, check that the plugs are resistor type, and also check in the distributor cap that the carbon resistor has not cracked.
It sounds like you have already checked the grounds, but you can sometimes find the source of the interference by using a multimeter in AC volts setting and looking for any significant AC voltage on the power and ground wires to the ECU (there should not be more than about 0.05V AC on those wires).
Are you using a MSD?But as soon as i let off
Hondata
I'm using NGK bkr6e's gapped at 36.I have to work tonight but I will check those other things tomorrow. And I'm using a msd coil but not the box.Hondata wrote:It could be interference either from the spark plugs or a missing ground.
If possible swap to stock spark plug leads, check that the plugs are resistor type, and also check in the distributor cap that the carbon resistor has not cracked.
It sounds like you have already checked the grounds, but you can sometimes find the source of the interference by using a multimeter in AC volts setting and looking for any significant AC voltage on the power and ground wires to the ECU (there should not be more than about 0.05V AC on those wires).
Are you using a MSD?But as soon as i let off
I have been having problems with my main relay the last few months. Friday night it decided it didnt want to work at all any more, so I replaced it that evening.
I have a 75-70mm mustang tb with a mustang tps. It has been hooked up exactly the same for over a year, So today when I got home from work I decided to rewire it anyway, I already did the rest of the car....lol. I took out my crome ecu and plugged in the s300. I turn the key and connect my laptop to the s300. so far so good. I try cranking it. It fires and dies. I think to myself....hmmm, thats strange. no error codes and everything still reads normal. So I add a shitload of fuel and voila. it starts right up. I'm like HOLY SHIT!!! everything is reading right.
I dont know what did it. Replacing the faulty relay, if the tps had a loose connection or a combination of both.
I have a 75-70mm mustang tb with a mustang tps. It has been hooked up exactly the same for over a year, So today when I got home from work I decided to rewire it anyway, I already did the rest of the car....lol. I took out my crome ecu and plugged in the s300. I turn the key and connect my laptop to the s300. so far so good. I try cranking it. It fires and dies. I think to myself....hmmm, thats strange. no error codes and everything still reads normal. So I add a shitload of fuel and voila. it starts right up. I'm like HOLY SHIT!!! everything is reading right.
I dont know what did it. Replacing the faulty relay, if the tps had a loose connection or a combination of both.
Well I got it running. But for some reason I can't get it to fill in any values in the lambda values in the tables. Under sensors, its reading the voltage. I set the settings according to method #2 http://www.hondata.com/techplxwiring.html
But I have a aem uego. I used it with my other hondata. Is it not compatible with the s300?
I even tried it using method one. It was reading voltage on the sensors but still nothing in the tables. And yes I switched it in settings.
But I have a aem uego. I used it with my other hondata. Is it not compatible with the s300?
I even tried it using method one. It was reading voltage on the sensors but still nothing in the tables. And yes I switched it in settings.
Ok, I have figured out a few things. They reason my s300 was acting all ufunny was my damn shorting out main relay.
The reason my lambda overlay wasn't working was because I had my wires on my mustang tps hooked up wrong. I followed the instructions on honda-tech on how to wire it up. It was way off. I finally went to a mustang site and found out what each wire was for and connected it to my harnessthe right way.
Anyway, I went out on a long road last night for about 4 hours tuning my car. Everything below boost is tuned damn near perfect. Damn the new s300 is a breeze.
I was wondering one other thing. I have a Fully built LS that I wanna rev over 8k. The low speed fuel map only goes to 8k. Is there anyway to raise it, to say 9k?
The reason my lambda overlay wasn't working was because I had my wires on my mustang tps hooked up wrong. I followed the instructions on honda-tech on how to wire it up. It was way off. I finally went to a mustang site and found out what each wire was for and connected it to my harnessthe right way.
Anyway, I went out on a long road last night for about 4 hours tuning my car. Everything below boost is tuned damn near perfect. Damn the new s300 is a breeze.
I was wondering one other thing. I have a Fully built LS that I wanna rev over 8k. The low speed fuel map only goes to 8k. Is there anyway to raise it, to say 9k?