ok so after my rebuild i've been having rough starts and posted up a forum and none of us could figure out why. Well today i had to pull off the T.B to adjust the idle set screw and this is what i found.
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That my friends is a pool of gas. Could this be due to the fact that my computer was tuned too rich, or do any of you guys suggest something else?
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i'm no expert but could it be the injectors spraying fuel when the intake valves are closed? the gas then just runs down the runners into the plenum
i had the problem of an injector being stuck open when i first got the car so i replaced it and it then ran fine. since then i've built the engine but i guess what i'm trying to say is if the injector was stuck open wouldnt it run like crap all the time, cause after it starts it runs fine. its just the getting it to start is the problem. could maybe when shifted tuned my computer he changed the fuel injecting timing also?
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the injector could just be out of time or staying open tool long or opening too soon
I'm guessing the injector timing is set by the computer and i'll have to talk to shifter to see if he changed any of that
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Its beena while since I looked at my HO manifold but wouldnt the fuel have to travel uphill to get to that location? Maybe take a look at your fuel pressure regulator or even a fault in the EVAP system allowing raw fuel to get to the EVAP purge solenoid.
ok so i hooked a temporary catch can to my fuel pressure regulator and that made a world of a difference. the car starts good now even when its warmed up. So that would explain why it starts good in the morning because all the gas in the mani would evaporate. so now the question is do i need another fuel pressure regulator and if so can i get an adjustable one off ebay?
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There should never be any fuel getting into the vac. line from the manifold to the regulator. If it is getting fuel in it then it needs replaced. Porsonaly Im getting rid of my adjustable because it stopped working correctly.
thats exactly what I was gonna sugest, if the inside of the FPR is ripped the the vaccum line will suck gas into the intake manifold... thats the only way your going to have gas in the manifold unless somethign is really, REALLY wrong.
ok so what about the FRP is it bad because i just replaced it about a year ago?
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there is a rubber diaphragm in the fuel pressure regulator.
picture this in your head..... the fuel pump pumps gas all the way up front into the fuel rail to the injectors, what the injectors don't use gets cycled back into the gas tank through the return line... now if you take a garden hose and poke a couple small holes in and turn it on... water will go out the holes but most make its way out the open end, if you want more flow out of the holes you block off the open end and the pressure in the hose goes up so more water squirts out the hose. Thats basically how the fuel pressure regulator works, the regulator is what controls the size of the opening on the open end of the hose. When you idling there is alot of vaccum, at wide open throttle there is no vaccum. When vacum is aplied to the regulator the vaccum pulls on the diaphragm which in turn unplugs the hole allowing more fuel to flow out of the fuel rail and back to the tank which means lower fuel pressure. When you hit the gas it losses vaccum the diaphragm sinks back down and the opening is closed casue fuel to stay in the rail and pressure to build. If that diaphragm is ripped fuel will pass right through it and get sucked into the intake manifold through the vaccum line..... which explains why you have fuel in the intake
thanks man that helps alot... should i buy an adjustable one off ebay or go back with the stock one from autozone?
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If you're going to get an adjustable one make sure you get one with a gauge or a schrader valve... my current gay ass adjustable fpr from the previous owner deleted the schrader valve...
As a result I have had no idea for years what the fuel pressure is set at... it runs decent, seemingly less than optimal, but I'm not gonna screw with it until I tap the rail for a gauge.
thanks... does anyone know what the pressure is supposed to be?
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never mind i just bought a stock one from autozone. thanks for all the help
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I had an accell Adjustable FPR that ruined my motor...
It basically did the same thing, as soon as the car turned on- it squirted gas through the vac line & into my manifold...
It happened when I was driving, and the motor just locked up.. All the cylinders were filled w/ gas, intercooler, charge pipes, intake manifold etc... I'm just lucky it didn't explode...
So, be glad you found the problem now, and not while youre driving.
ive got a caspers and accel never had 1 problem with either
my caspers is actually for sale
