knivesm

REbuild a s4 engine.Stock ecu i have upgraded the injectors to 550 cc and also the fuel pump is a Walbro 550HP 255LPH In-tank EFI HP fuel pump - Mazda RX7 86-88 Direct Fit. So could the reason it is not starting due to way too much fuel or does that not matter?

need RX7

iTrader: (4)

I don't think it would cause it to not start, but it will probably run like ****. Maybe it did end up flooding itself out?

pistones

iTrader: (5)

is this on an NA or TII?

knivesm

Sorry it is a Na and the stock ecu is a na s4 which the ecu is for 460 cc fuel injectors.

SpikeDerailed

iTrader: (7)

Is this rebuild on used housings? If so I would venture to guess a lot of extra fuel and low compression are the culprits. Have you tried deflooding and possibly a pull start? May need to at least temp. wire in a fuel pump kill switch until the engine build compression.

Already verified the standard issue items like CAS timing and TPS settings?

dvs71990

Dude, you cant run a walboro fuel pump and 550 cc injectors without running stupid rich and flooding. The na run rich to being with

knivesm

yes did the cas. How do i set up tps? May need to at least temp. Wat u mean by that?

knivesm

i thought in order to setup tps the car has to be running?

joeylyrech

iTrader: (11)

take the 550cc out and put back the stock injectors(NAs dont need that much fuel)and wire a fuel pump kill switch,turn the fuel off while cranking as soon as it start turn the pump on.

knivesm

k i am going to put back the stock injectors and stock fuel pump and see if it turns on thxs all for help

SpikeDerailed

iTrader: (7)

Sry I was being lazy temp. = temporarily

Is this rebuild with used housings?

pistones

iTrader: (5)

yea you basically screwed yourself. you don't need 550 injectors or an upgraded pump. and joeyrylech is right add a fuel pump cut off switch, that helps a lot with rebuilds.

arghx

iTrader: (3)

walbro 255 on an n/a is just overkill. it will have a rich idle and not result in any performance increase.