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Dear Auto Advisor, I have a 1996 Geo Tracker with the 4 cylinder 16 valve engine. The engine does not want to accelerate. It seems to bog down and slowly starts to build up engine speed over several seconds. It seems that when the rpm reaches close to 3000 rpm it appears to have more power... The local Chevy dealer looked at it for 3 hours and could not find the problem. They tested timing, fault codes, compression, air induction, etc. The one item they could not test was fuel pressure because they did not have the adapter to connect a gauge. From what I learned about fuel injection systems it seems that a faulty fuel regulator may be the problem. Does this sound like a feasible answer? Do you have any suggestion? The fuel gauge also seems to be dropping faster than usual. The engine rpm at 55 mph is about 2100 and it feels quite doggy and does not respond very well. If I shift into second it again seems more responsive but then the engine rpm is high. Thank you for any comments you may have. J. Adams

Mr. Adams, Unless you can do a pressure, volume, static, wave pattern test then you can't tell much about your fuel "delivery" system. A fuel pump can pass the pressure, volume and static test and still not be any good. This is why the "wave pattern" test will show if you have a problem with the fuel pump turning fast enough to deliver enough fuel. I doubt that the injectors are faulty because you mention the car ides well and just seems to "Lack Power". If the fuel system DOES check out properly, try removing an upstream O2 sensor ahead of the Catalytic Converter. I have seen partially clogged converters have similar symptoms that you are describing. If you are a local then please call my service advisor for a time to come in for a free test drive and consultation to determine how big of a problem you really have. James Morris Tech tip: The holidays are approaching, and according to AAA the most car driven holiday is Thanksgiving. Most car problems deal with cooling systems that overheat closely followed by tire problems. Belts and cooling system hoses only have a 6 to 7 year life expectancy. The failure rate of a belts and or hoses over 5 years is very high. Antifreeze, (even the newer type antifreeze) may start to cause problems after only 3 years. It MAY destroy gaskets as well as plastic tanks on radiators leading to overheating problems. It is imperative that the correct antifreeze be used in your vehicle. Don’t depend on the color of antifreeze to be the right antifreeze for your car. Please check your owner’s manual for the right type antifreeze for your car. Remember there is no such thing as universal antifreeze, only universal damage from using the “wrong type” of antifreeze. Peace and prosperity, James Morris

 

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