Auto 90 camaro rs, swapped the FI 305 for a new carb 355(bored 30 over)(didn't have money for FI). All of the following symptoms have been getting worse and worse over the last 2-3 weeks. Car runs fine when started up for the first time of the day, but will only run well for about 10 min. and then, car constantly stalls out and dies, loss of power, oil pressure drops, I have a small oil leak(can't tell where it's coming from), I can rev the car in park perfectly fine, but will constantly stall in drive, when it starts to stall I can throw it in neutral and sometimes bring it out of the stall, but doesn't always want to rev up in neutral, when ever I make a sharp turn something under the hood squeaks(does it the most when turning left). Sometimes when the car dies it won't even try to start, fan will come on but thats it, after waiting about 10 min. it will start right up. I replaced fuel filter, all vacuum lines are connected as far as I can tell, pcv valve is connected.
2007-09-07 16:27:19 · 2 answers · asked by nick 1 in Cars & Transportation ➔ Maintenance & Repairs
Does the new motor have a carburetor or TBI (throttle Body Injection)?
If you went with a carburetor and installed a mechanical fuel pump on the block the fuel being fed to the carburetor by the original fuel pump in the gas tank will be too high. Mechanical fuel pumps mounted on the engine block suck the fuel out of the tank and pump it under relatively low pressure (like 4 PSI) to the carburetor.
Fuel injected pumps in the tank deliver about 25-35 PSI or higher depending on the year/model. A throttle body injected fuel pump will deliver around 8 PSI.
Not knowing the details, you can disable the electric fuel pump by pulling a fuse and see how it runs after this experiment assuming you have installed a mechanical pump on the side of the engine block to feed the carburetor.
If this is not the case and you installed the original intake manifold and FI system is as it was, then it sounds like you have a EGR valve that is stuck open. When this happens the car will run great at high idle and high speeds but die when you slow down since too much exhaust gas is being introduced into the combustion cycle.
If you didn't have the intake manifold hot tanked and scoured clean by a machine shop before re-installing it, you have all of the old carbon still floating around in the channels or passages inside the intake manifold. The pieces are small but hard and big enough to hold the EGR valve open.
You can take the EGR valve off and clean it out and re-install it but this can and will occur again in the future unless you go all the way with the intake manifold and have it cleaned out. Hot tanking and wire brushing the channels out is the only certain method for cleaning out that old carbon.
Good Luck!
2007-09-07 17:06:52 · answer #1 · answered by CactiJoe 7 · 1⤊ 0⤋
time for a new coil my freind
2007-09-07 23:41:42 · answer #2 · answered by william s 2 · 0⤊ 1⤋