1997 Chevy C2500 3/4 ton with 5.7L V8 - Dies when the RPMs drop below 1000 rpm. We have replaced the fuel pump twice and the fuel injector regulator with no changes. Any ideas what is causing the problem and what needs replaced to fix it? Thank you.
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one of two things come to my mind in hearing this , 1st damaged inertia pump switch (this switch shuts off fuel pump in case of high Inertia-wreck) 2nd the fuel pick up or baffles inside fuel tank have broken off this will require the removal of the tank for a look at it
Hello My Friend, hate to see you having problems with your vehicle! May i suggest you try this one procedure to check your fuel pump pressure while accelerating the engine to 2000 RPM. Electric fuel pumps start by-passing after so many miles of being used. And they show this in a strange and confusing way. Only way to catch this is by connecting a fuel gauge to the fuel rail of your truck and accelerate it to 2000 RPM, or what ever stage it stumbles. Your fuel pressure should hold steady at 55-60 PSI. If it drops down as you accelerate you need to replace the fuel pump in your tank. And this problem should go away. Hope this all works out for you Sir....
I doubt the two problems are related. The computer uses an idle speed control valve to regulate idle speed. The valve controls the amount of air entering the intake. You should have a check engine light on and also a stored trouble code for the valve. It could also be a problem with the throttle plate in the throttle body.
loose o rfaulty electrical connections at distributer, coil or alternator.fault in fuel or electrical systems.Vacuum leak at the gasket surfaces of the intake manifold or throttle body.,Make sure all mounting bolts/nuts are tightened securely and all vacuum hoses connected to the manifold are positioned properly and in good condition
mine is doing the same rev and drop its is the egr controll soleniod in my 89 ford bronco 5.0 causing a code 22(map and boad vaccume) code 33 (egr malfunction) $31.00 @ orielly auto parts $39.00 Napa Auto parts