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Two miles to a fill-up Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Thu, 13 May 2004 12:34:17
In Reply to: Re: SLOW acceleration, Mike Tadros, Wed, 12 May 2004 15:29:48 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I assume you mean 8 miles to a gallon. At 8 gallons per mile, you'd be dumping raw gas on the ground.
OK, enough ribbing for a typo. You have a severe over-rich mixture. This is no minor issue - this is big league. You're dumping in so much fuel the spark goes out. This is probably well past 02 sensor issues. The catalytic converter isn't going to add fuel to the intake manifold, and that's where the problem is.
I would focus on the Fuel Pressure Regulator and the new fuel injectors. The fuel injection assumes a certain fuel pressure, and opens the fuel injectors for a period of time to inject the right amount of fuel. Too high a pressure, and you get more fuel for a given injector opening.
The other part could be injectors with too much flow, injectors sticking open, or injectors weeping. The ECU can adapt, but only up to a point. If the fuel flow for a given pulse is too great, you'll dump great amounts of fuel in. By sticking, I mean that the injector stays open a little bit past the pulse. By weeping, the injector is actually leaking fuel into the intake manifold even when it's 'off'.
The first thing I'd do is see if you have fuel in the vacuum line from the Fuel Pressure regulator to the throttle body. If the FPR diaphram ruptures, you'll push raw fuel (is there cooked fuel?) into the intake, causing a seriously rich mixture. If so, it's time for a new FPR. If that didn't do it, I'd stick the old injectors back in. If that fixes the problem, then at leas you know you're on the right track. The next would be to check the fuel pressure regulator pressure and fuel flow rates. I recommend that second, because it takes some special tools (pressure gauge), and messing about with raw fuel is a safety issue.
A bad vacuum line would actually help the situation, by leaning out the mixture some. The only place a vacuum leak could cause excessive fuel would be the vacuum line from the throttle body to the FPR. The FPR provides less fuel at high vacuum, and more fuel the closer you get to atmospheric. So a big leak on that hose could cause rich running. Probably not this rich, but it's about all I've got.
I'm putting my money on a ruptured FPR diaphram.
posted by 192.249....
, Thu, 13 May 2004 12:34:17 <-- Viewing This Message, Wed, 12 May 2004 10:15:37
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