Jdmsolutions

car is a 90 ef. i just put in a fresh motor.. fully rebuilt.. pulls 165 across compression. so leaks... car will start and i have to keep on the gas to get an idle out of it.. no codes thrown.. but it runs bad.. smokes bad out of exhaust and through my catch can... has fuel. has spark.. and the tach doesnt work now either. any imput is greatly appreciated.. could it have anything to do with grounds? would that stop the tach from working?

xaine

dad disty
or rather the cam sensor in the disty?
just a guess

Jdmsolutions

shouldnt be... i had 2 different distributors on there so far... i started the car on obd1... then i decided to de convert back to obd0.. so ive ruled out distributor, ecu and o2 sensor

xaine

timing a tooth off?
Broken cam?

i know there is a ground to the thermo housing
can cause similar issues

just more guesses

tell me more about your setup
parts you used ect....
what you have done

93formula

firing order correct?

Jdmsolutions

firing order is correct... its an ls. built bottom end, jg303 cams... timing is on. has 36lbs of fuel pressure, has spark. i have 3 grounds to the motor.. one on tranny. one on the valve cover and one to the intake manifold

0ne-Cam

prior to swapping that engine in there, what engine was in there, did it run correct? if so theres something wrong with the motor u just swapped. u stated its fully rebuilt, but its readying 165 across in compression, im guessing its for boost. try decreasing the fuel pressure on the fpr, down to 30-32

Jdmsolutions

i had a gsr in there. and it ran correct..i did do some harness work.. but im 100 sure i didnt flunk anything up. yes its for boost. plus the 30 seconds of runtime probably hasent seated the rings very well yet.. i shouldnt haveto turn down fuel pressure. its a stock pr4 ecu, and my new swap is stock compression.. so it should run jsut as stock

0ne-Cam

did u pour a little oil into the cylinders prior to start up? try to run it for a minute and check the compression again just to make sure everything is alright. i had a similar problem on my d series with freshly new pistons, it was smoking because of the oil i poured in there. and tell us about the tach not working, at all or what?

Jdmsolutions

tach doesnt work at all.. no i didnt pour any oil in. its fouled 2 sets of plugs now. im thinking maybe my cams are too much for a stock basemap... they are jg303s.. 417 lift

0ne-Cam

if you have the stock cams, swap them in. before tuning comes swap the aftermarket cams in. those cams have .015" gross lift (right?) and thats probably why the plugs are failing

Jdmsolutions

jeeze i hope so.. i have a couple sets around. so well swap em and see whats up

traxxasx

Lol is your missing the ground thats on the thermostat housing you get some major problems with that one. Car runs all ****ed up.

Jdmsolutions

so i need a ground from the therostat to the firewall somewhere?

xaine

no, u should have ground wires on the wiring harness
that hooks up to the thermostat housing

i have three grounds
one from core support to vc
one from batt-to frame- to tranny
one from wiring harness to thermo housing

got to say, that your tach not working, is saying something
double and triple check your wiring

did you change injectors? or have the right wiring at the resistor box?
or where the box used to be depending on what injectors your using

Jdmsolutions

stock injectors.. i have 3 grounds from harness on my thermostat. one to valve cover , one to intake manifold, and one from trans to firewall...

0ne-Cam

try adjusting the dizzy while motor is running? get back to us when you have those cams changed. for the i searched around and for that particular issue, they keep saying on the t housing, clean the terminal where the ground bolts up to, other than that if it keeps happening, problem is in the wiring somewhere

Jdmsolutions

well thanks for your help guys. ill see what i can get done.. im just bout to dothe lash on the stock ls cams.. so i hope that helps