hard to start on map ecu 2
#1
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
my car is a 93 SC300 w/ 550cc injectors, turbonetics 60-1 and supporting mods. also running the map ecu IAT as well. anyways i'm currently running the 525cc map that i found on the map ecu forum, my question is some days it will start and run perfectly fine for normal driving but really rich at WOT. but if i were to turn off the car for about 15-20 minutes and try to start it up again it won't start unless i keep cranking it for about 5-10 times. and most of the time when i'm trying to start it up it will run for like 1 second then dies again. and when it does start it wouldn't go past 3k rpms and if i try to go past it, it will die on me. a lot of times it will let me go past 3k rpms but like i said some days it runs fine but some days it runs like crap. i know i need a professional tune but i'm still saving for it.
#2
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
i had the IAT in the center of the red circle b/c i was reading a thread here on CL that this was the right place to put it but now i'm having second thoughts about it. b/c when it's cool outside or my engine is cold it'll run perfect but once it starts to get hot the it'll start acting up. what should the temp. be showing on the dashboard on map cal, mines show up to 110+ degree F? and as for the jumpers i'm not sure on that yet, i'll have to find the correct tool first. also i'm not running the stock o2, only the lc1 wideband.
![](http://i147.photobucket.com/albums/r307/hmoob_lis704/iat.jpg)
#3
Lead Lap
iTrader: (1)
Join Date: Jan 2009
Location: Cumming, Georgia
Posts: 599
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
I was having a similar issue, the car would run, die, and have trouble restarting, it was a combination of the EFI relay and a bad battery, after replacing the battery, it wouldn't die, but if the car was turned off after running, it wouldn't turn over for a few minutes, later I figured out that I needed to pull out the EFI relay and blow on it N64 style, which fixed it and now it doesn't do it anymore. My car isn't an NA-t but it is turbo and it is using MAP-ECU2.
In short, next time it won't start, pull out the big round EFI relay under the hood and make sure its clean, then push it down snug, get it in there good.
In short, next time it won't start, pull out the big round EFI relay under the hood and make sure its clean, then push it down snug, get it in there good.
#4
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
i just did the 12v mod and it kinda fixed it but not all of it. if the car is running and i turn it off and and try to turn back on right away, it won't turn on until the 2nd try. btw is it normal for the fuel pump still running for about 2-3 seconds after i've taken the key out when doing the 12v mod, i'm running the walbro 255 btw? also it doesn't die when i go past 3k rpms anymore or at least for now..i'll have to drive it more to really know. where did you put your iat?
#5
Lead Lap
iTrader: (1)
Join Date: Jan 2009
Location: Cumming, Georgia
Posts: 599
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
i just did the 12v mod and it kinda fixed it but not all of it. if the car is running and i turn it off and and try to turn back on right away, it won't turn on until the 2nd try. btw is it normal for the fuel pump still running for about 2-3 seconds after i've taken the key out when doing the 12v mod, i'm running the walbro 255 btw? also it doesn't die when i go past 3k rpms anymore or at least for now..i'll have to drive it more to really know. where did you put your iat?
Trending Topics
#9
Lead Lap
iTrader: (3)
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
list of checks
did you configure the ignition inside the box
get rid of IAT
disconnect your factory o2(s) from the factory ecu its ok to keep it to the mapecu2
reset battery
look at o2 readings from wideband and make some good adjustments or just datalog the sucker
this is just for the mapecu2, I have no idea if you might have car issues so im just saying.
did you configure the ignition inside the box
get rid of IAT
disconnect your factory o2(s) from the factory ecu its ok to keep it to the mapecu2
reset battery
look at o2 readings from wideband and make some good adjustments or just datalog the sucker
this is just for the mapecu2, I have no idea if you might have car issues so im just saying.
#12
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
list of checks
did you configure the ignition inside the box
get rid of IAT
disconnect your factory o2(s) from the factory ecu its ok to keep it to the mapecu2
reset battery
look at o2 readings from wideband and make some good adjustments or just datalog the sucker
this is just for the mapecu2, I have no idea if you might have car issues so im just saying.
did you configure the ignition inside the box
get rid of IAT
disconnect your factory o2(s) from the factory ecu its ok to keep it to the mapecu2
reset battery
look at o2 readings from wideband and make some good adjustments or just datalog the sucker
this is just for the mapecu2, I have no idea if you might have car issues so im just saying.
actually the plugs that i'm running are denso ik27 which are pregapped at .030 iirc. i have a new fuel filter but have not installed it yet and i don't have a fuel psi gauge.
Last edited by SC300_704; 04-27-10 at 02:23 PM.
#14
Lead Lap
iTrader: (3)
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
set your iat back to factory setup, take off the mapecu2 iat. I dont know what your configuration is supposed to be like on the ignition but just look it up. and disconnect the o2 from your car's ecu if you havent done so and try retunning and driving. Im not sure about the coolant temp sensor, quick easy check for your coolant if you have a wideband is just turn the car on from a cold start it will run richer on start up then look to see if your air/fuel starts to lean up a little after you reach warm up temp.