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No, acceleration between 2,000-3,000 rpm's when

I have a 1989 ford festiva carburated engine and here is my problem No, acceleration between 2,000-3,000 rpm's when a load is on the engine. Bypassed muffler, and cat. converter. Replaced fuel filter, air filter, and distributor, some vacuum lines. Checked timing,camshaft timing, solinods work properly on the firewall, map sensor (5.7V-1.1V), fuel pump good pressure, egr valve (cleaned),oxygen sensor (.5-1.0V), Engine Temp sensor on manifold (2,000-300 ohms resistance), added carb cleaner to carburator, no change in idle speed. No vaccum leaks around the carburetor.Vacuum falls to zero when accelerator petal is quickly pushed to the floor, when going up incline vacuum pressure drops to 10,5, or 0, and stays there till up the incline. Car barley make 55mph on level road. Engine idles fine, vacuum pressure is steady at 18 at idle, and reves fine to 4,000-5,000 rpm's when warm. Different story when going uphill. Thanks

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SOURCE: 1989 GMC 2500 5.7L - engine surges and stalls at idle. Loses power at cruising speed.

Wow you have replaced a lot of stuff. Lets go back to the Fuel pump. When you replaced it did you replace the hose between the pump and the sending unit. These are common for splitting. Have you hooked up a fuel pressure gauge to check what pressure you have? It should be real close to 13 psi and should raise to at least 18 or 19 when you pinch off the return line.

Posted on Jun 02, 2009

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SOURCE: 1989 Chevrolet C1500 with 5.7L V-8. Engine dies

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Posted on Jul 31, 2009

SOURCE: stalls while idling and engine

Actually I am hessitant to respond to this one. The problem you are having COULD be many things, however my take is different than the others you seem to have. I believe that you are having timing issues caused by a Crankshaft Positioning Sensor, and/or Cam Positioning Sensor. Thesee are how the computer knows where they are and adjusts timing to make the engine fire at the correct time, thus it is called timing. The computer makes these adjustment is literally THOUSANTHS of a second, and if the sensor is off just a little especially at very high, and very low revolutions you will have a miss, which will at high RPM's "pop" due to it wanting to stall but because of the RPM's keep momentum, and pops but keeps running but at low RPM w/o that momentum, just stalls. I pray this helps you understand WHY I think you may have timing issues and why.

Posted on Mar 22, 2010

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