boost problem check engine light on
08-20-2006, 06:40 AM
#13
0.0 BAR
Join Date: Jan 2006
Posts: 43
Re: boost problem check engine light on
im no pro here. but just to share ....
i do face this issue as well. well bear with me with alittle short story.
im running 7AFE with bolt on turbo. running stock fuel pump, 400cc injector, stock map sensor and SAFC II to control the fueling (boosting 0.
. now, before i tried to change my map sensor to turbo map sensor, everything was running fine. until my itchy hand tried to change to turbo map sensor (which supposed to be better), thing started to go wrong.
i've 2-3 turbo map sensor frm variety of toyota turbo machine. although all having the same wiring colour coding as my stock unit, but it doesnt run. Its either flood the engine or chock the engine (leaned out). so i decided to give up and put my stock map sensor back.
thn problem come. whn i started to floor throttle aggressively, im facing either boost cut or fuel cut. the car litterally chocking and engine check light on. should i floor smoothly, things looks ok. even i reset my ecu also the samething. so i suspect my map sensor gone...
but after a few days, i tried to play around with the fuel setting, i notice i forgotten to lower my fuel point after that day map sensor swapping section. so i lowered my fuel setting, and i manage to solve it partially. there is no more boost cut of fuel cut even i floor it at once. but my check light will still come on.
so im being told, too lean or too rich, engine check light will light on.... not sure how true it is. but i believe in too rich it will, too lean... i doubt so
i do face this issue as well. well bear with me with alittle short story.
im running 7AFE with bolt on turbo. running stock fuel pump, 400cc injector, stock map sensor and SAFC II to control the fueling (boosting 0.
. now, before i tried to change my map sensor to turbo map sensor, everything was running fine. until my itchy hand tried to change to turbo map sensor (which supposed to be better), thing started to go wrong.i've 2-3 turbo map sensor frm variety of toyota turbo machine. although all having the same wiring colour coding as my stock unit, but it doesnt run. Its either flood the engine or chock the engine (leaned out). so i decided to give up and put my stock map sensor back.
thn problem come. whn i started to floor throttle aggressively, im facing either boost cut or fuel cut. the car litterally chocking and engine check light on. should i floor smoothly, things looks ok. even i reset my ecu also the samething. so i suspect my map sensor gone...
but after a few days, i tried to play around with the fuel setting, i notice i forgotten to lower my fuel point after that day map sensor swapping section. so i lowered my fuel setting, and i manage to solve it partially. there is no more boost cut of fuel cut even i floor it at once. but my check light will still come on.
so im being told, too lean or too rich, engine check light will light on.... not sure how true it is. but i believe in too rich it will, too lean... i doubt so
08-23-2006, 06:11 PM
#19
3.0 BAR
Join Date: Aug 2003
Location: NE-PA
Posts: 4,666
Re: boost problem check engine light on
Originally Posted by normality78
im no pro here. but just to share ....
i do face this issue as well. well bear with me with alittle short story.
im running 7AFE with bolt on turbo. running stock fuel pump, 400cc injector, stock map sensor and SAFC II to control the fueling (boosting 0.. now, before i tried to change my map sensor to turbo map sensor, everything was running fine. until my itchy hand tried to change to turbo map sensor (which supposed to be better), thing started to go wrong.
i've 2-3 turbo map sensor frm variety of toyota turbo machine. although all having the same wiring colour coding as my stock unit, but it doesnt run. Its either flood the engine or chock the engine (leaned out). so i decided to give up and put my stock map sensor back.
thn problem come. whn i started to floor throttle aggressively, im facing either boost cut or fuel cut. the car litterally chocking and engine check light on. should i floor smoothly, things looks ok. even i reset my ecu also the samething. so i suspect my map sensor gone...
but after a few days, i tried to play around with the fuel setting, i notice i forgotten to lower my fuel point after that day map sensor swapping section. so i lowered my fuel setting, and i manage to solve it partially. there is no more boost cut of fuel cut even i floor it at once. but my check light will still come on.
so im being told, too lean or too rich, engine check light will light on.... not sure how true it is. but i believe in too rich it will, too lean... i doubt so
i do face this issue as well. well bear with me with alittle short story.
im running 7AFE with bolt on turbo. running stock fuel pump, 400cc injector, stock map sensor and SAFC II to control the fueling (boosting 0.
. now, before i tried to change my map sensor to turbo map sensor, everything was running fine. until my itchy hand tried to change to turbo map sensor (which supposed to be better), thing started to go wrong.i've 2-3 turbo map sensor frm variety of toyota turbo machine. although all having the same wiring colour coding as my stock unit, but it doesnt run. Its either flood the engine or chock the engine (leaned out). so i decided to give up and put my stock map sensor back.
thn problem come. whn i started to floor throttle aggressively, im facing either boost cut or fuel cut. the car litterally chocking and engine check light on. should i floor smoothly, things looks ok. even i reset my ecu also the samething. so i suspect my map sensor gone...
but after a few days, i tried to play around with the fuel setting, i notice i forgotten to lower my fuel point after that day map sensor swapping section. so i lowered my fuel setting, and i manage to solve it partially. there is no more boost cut of fuel cut even i floor it at once. but my check light will still come on.
so im being told, too lean or too rich, engine check light will light on.... not sure how true it is. but i believe in too rich it will, too lean... i doubt so
Originally Posted by salsero_utah
The weird think about is that some time I get only 6 psi even with the boost control on and sometimes I'll get 13 psi so Im not sure if the map sensor I have still good
08-24-2006, 12:37 AM
#20
0.0 BAR
Join Date: Jan 2006
Posts: 43
Re: boost problem check engine light on
Originally Posted by slo_crx1
Your problem more than likely is the afc...you can only scale back so far with an afc before the ecu sees boost regardless. On honda's with dsm 450's usually about 8 psi is the limit, don't know the specifics on your motor and size turbo, but it's a good place to start.
