ok so the car is a 93 subaru loyale FI auto 4x4 a lady put water in the oil and yeah the engine went um... bad. so i had a good motor i put in it was a carbed motor so i swaped the intake and disty from the bad motor onto the new one timed it (20btdc with green plugs hooked) it fires up but has a poping through the intake and within like 5 min. of running it the exhaust pipe is glowing red from the head pipes all the way to the muffler. when its daylight out im gonna chop the cat,resonator out and see if that solvs the problem because when its running it sounds REALLY restricted and the highest rpm i can get it to is 5000. thanks for any help i really need to get this car back on the road.

 

 

PS i have checked:

 

firing order 2 and 4 are not crossed

 

all vacume lines are good

 

fuses,fusable links

 

has spark (duh)

 

new plugs,wires,disty cap,roter

 

timing is on, so are belts

 

im stumped pleas tell me its the restriction of the muffler.

 

Thanks BIG TIME !!! Rob

Popping through intake suggests the timing is off or a burnt intake valve. Red hot cat suggests a timing problem.too much fuel/clogged cat. High rpm restriction also suggests a timing problem. I would look real hard at the valve timing/ignition timing before doing anything else.

the engine ran good befor i put it in the loyale but i will check the valv/cam timing again. could it be that the carbed cam is diferent than the FI cam? i dont think there is. but then again??? Rob thanks

the engine ran good befor i put it in the loyale but i will check the valv/cam timing again. could it be that the carbed cam is diferent than the FI cam? i dont think there is. but then again??? Rob thanks

 

Actually the caarbed cams are quite a bit different. I don't think that would cause thee type of problem though.

 

I would consider swapping the cams, but it may not be the problem.

 

Also that carbed block has lower compresion than the SPFI. Again not sure why that would cause an issue.

This may be way off but I am wondering about the fuel. If someone has put water in the engine in place of oil, I wonder if something else has been added to the fuel in the tank that may be causing the engine to run extra hot.

Sure sounds like retarded ignition timing.

Vacuum gauge on the intake is a simplier way of checking for a clogged cat.

ok so i droped the y pipe and turned it over low and behold gas is just running out of the exhaust ports and flaming up so tomorow im gona pul lthe belt covers and check the belts maby they jumped time bad tentioners? idk any other ideas?

If fuel is running out of the exhaust then the injectors must be leaking.

Its SPFI not MPFI

If fuel is running out of the exhaust then the injectors must be leaking.

 

I had the same thought. The SPFI injector must be stuck open or partially open.

 

GD

Just for giggles, pull the vacuum line to the FPR. Looking for any fuel. When it ruptures the pump will pump fuel directly into the intake manifold. Only seen a total of one FPR fail but it does happen.

im guessing FPR meens fuel pressure regulator and were might that be? unless you meen the goofy metal things inline on the fule line just befor they hook to the throttle body injector.

Is it possible that in your swapping you didn't get the vacuum line connected to the fuel pressure regulator?

got it going timing on the valvs was off.

Glad to hear that. Thanks for the update.