Im running a s4 na motor with s4 wring harness,injectors,manifolds,afm ,s4 ecu na ,t2 fuel pump pump,emisions blocked off, 5th and 6th port sleeves removed...
I have checked the injectors, sensors, replaced different wiring harness,ecus. afm, fuel pumps, regrounded the points and still no luck.Jrx tried to figure it out too but no bueno... It will rev over to 7k, but when u drive it wont go over 3800k rpm. I tried a s4 na fuel pump, it made it worse...Its gayyy!
Any other things I CAn try?? Is there anything u guys can think of thats wrong with the electrical? The vacuum is okay too, everything is plugged off on the manifolds and rats nest is removed by JRX rotary. Iono what else to check for...theres already alot ground points[engine, ecu, firewall, shock tower] any ideas??When i grounded the car, it reved a bit better, but still hesitates at 3800k... I have adrift event this saturday !!!!


PLLLZ HELP

 

More than likely, your MAP/boost sensor vacuum hose is disconnected. It's beside the variable resistor and the hose runs to where the LIM and middle intake bolt together.

Vince

 

The secondaries turn on at 3,800rpm, maybe they're not?

 

yeah its hooked up. The injectors are supose to fire at 3800, but i dont think it is. Jrx rotary shop said they are firing, but then if they are why woulndnt itrev over 4k then?
Today I tried pouring fuel injector cleaner in my gas tank and added more Neg. batt grounds to the firewall ,upper engine block, and LIM near the 2ndary injectors. Damn still no luck... drift event tmrw... must figure this problem!!!

 

replace da variable resistor pack

 

DOOOD I JUST FOund a huge fuel leak from my fuel line,its all cracked!!! It was dripping fuel as my enginewas idleing dripping fuel over the spark plugs !!! damn danger!!! Im guna replace it asap and hope itwas the main problem.. and to prevent another epic failure.

Jrx tried a few resistor packs, including their own custom one they made..didnt work.....damn..

 

okay okay i just replaced the fuel line hose, and OMG my engine started up right away, didnt even need to pump the gas, and it idles at 750-900 , it used to idle at 1500-1700. And ireved it it freaken reved faster than it ever did b4 and kept shooting flames.I havent drove it yet, because my car is a bitch to get out of the driveway, [ihave to take the aero off] Im guna try it, im pretyy sure the hesitation is gone..

 

guna try pouring more injector cleaner in my fuel tank and see if that will improve it too!!

 

damn stil fail.... it revs alot better standstill, but once i drive it it still hesitates badly at 4k... sometimesitll let me creep thru 4k if i dont stomp the gas that hard... at standstill reving it seems alot more responsive tho... I also found anotehr vacuum leak, and fixed it but still no luck..

 

You didn't tell us it was a carb swap.

 

fluck...my motor blew. its done.. im so sad.

 

i never said it was carb its fuel injected s4 na. I just had to pump the gas before to start up.

 

That's what you're NOT supposed to do with a fuel injected engine.

 

Do you still have cats? They could be clogged.

 

gutted cat.. yeahmy engine is blown... I think my rear housing cracked or iron, cause a lot of oil and coolant is spilling out of the rear motor and it wont start anymore. It makes cluky sounds too... I didnt even drive it when it blew, it wa sjust idleing on my driveway when all of asuuden the engines sounds changed and sounded like a cluky engine and then just shut off itself and didnt want to restart. Looked in the engine and saw all the oil and collant pouring out...damn. its my 3rd engine already...

 

bummer. I would suggest not messing with stuff unless you really know what is going on. Fuel problems are bad. Especially if you end up making you car run lean because there is a problem. Then you get a blown motor.

You may have heard it ping a couple times when you were idling.

T2 motor time!