ok, so my car was fine one day and then later that night something horrible happened. At idle my car is 100% fine. Then when i tried to drive it home it would lose all power around 2500-3000rpm and if i tried to continue accelleration it would backfire excessively like it has a limiter set at that rpm range. What could be the problem? I have no clue at this point, my best guess is some computer tuning issue, but what has me confused beyond belief is how it happened so suddenly.

as for modifications..... im running with an apex power fc for management, also.... stock engine, 15,000 miles...intake, 3in downpipe, centerpipe, and catback. brand new stock spec spark plugs. fluidyne radiator, fluidyne oil cooler, greddy front mount intercooler, new stock injectors, walbro fuel pump....

any help would be greatly appreciated...

 

did you ck vac line to the map sensor???

 

check leading coil

 

try reseting ur ECu

 

I had this problem when I fouled my plugs... sounds like ignition problem....

 

Check to see if you have power under partial throttle and no power under full throttle. If this happens then the problem is your secondary throttle body not opening. This canether be a bady soleniod or vacume line. What happens is that the computer sends a signal to open the secondary throttle body buterflies and them adds extra fuel for the extra air, but since there is not extra air the engine starts to flood.

 

hey im getting this prob but i am a carby 1st gen i do have spark but still wondering. i checked my plugs the rears were wet and the front dry.

 

well i dont have power regarless of throttle position if i just let it creep up to 2500-3000 it cuts out.... or if i give it full throttle...i havent checked the line to the map sensor, or reset the ecu.. unless by that you mean disconecting the battery.. i checked the plugs also, they seemed to smell somewhat like fuel, possibly more than a plug should....hopefully i can figure this out soon, startin to get rotary seperation anxiety.. i miss that un-catalyzed exhaust smell in the morning, after all the best part of wakin up is carbon in my lungs...

 

HAHA that's great... I can hear it now, sounds just like the Folger's Coffee jingle... lol

 

im having trouble actually finding the map sensor.... it must be right under my nose...where exactly should it be located?

 

On the firewall towards the driver's side. Its close to the brake booster and the reservoir for fluid. Says Mazda boost sensor or something similar on it. It has a single electrical connector and a single hose.

 

I have the same problem happening right now but i still dont know what it is. All lines are good going to the map sensor, but im throwing a check engine light.

 

I would agrre with you if your reffering to the double throttle plates in the UIM as they are controlled by a solenoid and there is a check valve that can fail. The secondary throttle plates in the TB are mechaniacally opened and are not controlled by the ECU.