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Hello all! I have a 99 ranger 2wd 2.5L 170, 000 miles. Theres a performance issue I believe. Plugs are good, fuel pressure good, injectors clean and maintenance has been kept well. There is a hesitation at 55-60 mph. When I try playing with the gas pedal when it does this it seems to have no effect. It does level out after a couple jogs of hesitating. I hooked up the vacuum gauge and at idle it bounces very fast and steady from 18-21. I slap the throttle open and it droos to zero then back up to the initial reading. At 200 rpm therapidly fluctuating needle is from about 14-22 and more bouncy or irregular if that makes sense. I do have a small exhaust leak fyi. Used water and carb cleaner (very carefully) and found no vacuum leak. Ignition timing cannot be adjusted and it has a new timing belt. Thanks for any input.
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Btw, there is no check engine light and I was informed that about a year ago when plugs were being changed, one plug was broken and the ceramic shaddered while in the plug hole due to overtightening. I assume pieces fell into the cylinder.
It’s hard to say what’s causing the bouncing needle. It should be steady at idle. There could be several contributing factors to the problem. Looking for vacuum leaks was a good call. Don’t forget to check engine mechanical. Make sure you have good compression and that the engine is in time. If not you will have performance issues. You can find more in depth information in this article. Good luck and keep us posted.
http://www.ericthecarguy.com/faq/solving-automotive-performance-issues
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