boost_its_what_for_dinner

car-87 turbo 2
mods-
3" exhaust
blow off valve
boost gauge
block off plates
reground alot per mazda tech
rewired power wire from altenator to battery
greddy pro-fec b type-s
new secondaries 550 cc

symptons-
car stutters under loads
ignition feels like it cuts out under load after temp is hot
cant rev past 3.5 k in gear except when cold engine and first gear only

goods-

daily driving is good til engine is warm
turbo boosts fine


bad-

i cant drive my car the way it was meant to be.....

Aaron Cake

iTrader: (1)

Is it the ignitors or coils that get hot? Because it's normal that they do since they tend to sink a lot of current...

Have you checked the standard stuff like TPS, pressure sensor (ground) and CAS?

HAILERS

A car that runs good cold, but once warmed up has some meaning to me. When cold, and you look at a wideband, you'll see that the afr's are rich. Once the engine gets a little warn, somewhere around 120 degrees, the afr goes richer by about one afr point. Say from 12.0 afr to 13.3 afr (just an example).

So I'm thinking that once fully hot, your not getting enough fuel. Why? Got me. Throw some more money at the car and buy a wideband to see the afr. If you have a laptop, a Zeitronix might do. It's cheaper without the display and you could look at the laptop for the reading.
'

j9fd3s

iTrader: (3)

along those lines it could be a bad coolant or air temp sensor, maybe the secondaries dont work. bad fuel filter? pump?

boost_its_what_for_dinner

1.well new fuel filter

2. i have a air fuel guage and it goes lean if i floor it and if i ease in to the gas it goes rich

then lean

3.as far as the pressure ground goes i have tried to reground but it made my indash

gauge not work so i think i cut a reference wire but per the diagrahm its right

4. also is there a place to buy a brand new engine harness

5. also anyone have the link to a website for the injector pigtails so i can do that too..

boost_its_what_for_dinner

oh sorry aaron

that i dont know it just feels like an ignition problem from experience with other cars and

the way it feels when it cuts out , do coils and ignitors go bad often

and it also has a hard time starting after being warm up

it will only start if i hold throttle wide open while cranking even then it barely comes to life

and just takes a second to rev up then all is fine til you let off the gas then almost dies

\idles low

My5ABaby

iTrader: (7)

Have you done a compression check?

mort2002

iTrader: (1)

well, i wam thinking he is running lean too, with 3" ehaust. what is your boost at? that could be an issue too, do you have a fuel cut defender? with 550cc injectors you cant push over like 11psi from my experieces.

HAILERS

Your words about the Boost/Pressure sensor (I guess) is worrysome. IF grounding the boost/pressure sensor on a series four, you ground the brown/black wire. ON some later cars it's a pure black wire. NEVER gnd the brown/red or the brown/white (I mean NEVER EVER THAT ONE). If you do, you chance whacking the ECU and or pressure sensor.

boost_its_what_for_dinner

thx hailers ill dub check that

but no fuel cut defender yet

boost stays at 5.5 on the aftermarket guage

i have tried a fuel cut defender, it did jack ****

and no to the compression check

boost_its_what_for_dinner

any other suggestions?

papiogxl

iTrader: (6)

Try switching out the leading coil, I just did this on flaresniper's RX-Sa7mon today and it fixed a problem that sound exactly the same. Bheiman also had this sort of problem with two other cars of various makes and this remedied it.