Question about 1999 Buick Regal

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I have a hesitation that starts at 55-70 mph,I changed the fuel pump, spark plugs, plug wires,fuel filter. If you slowly rev the motor it starts to miss at 4g on the tack.

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Check the map sensor for proper operation

Posted on Jul 31, 2009

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Depending on your vehicle, if it has a distributor. You may have to change it out completely. It happened to me. Changed everything and that was the last item. Worked after that.

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Start with a complete tune-up

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Do spark plugs, spark plug wires, distributor cap, rotor cap, spark plug wires, fuel filter, air filter, oil & oil filter.

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I have a 1988 Volvo 740 GLE non-turbo with a problem. The car Idles fine, When you give it gas slowly it revs up slowly, but when you step on it, it like chokes out and back fires. I've replaced the Fuel...


you should have two fuel filters on that car one under the car on the fuel line it sounds like its not getting fuel right when did this start after the plug and wire change or after the timeing or after the fuel rail thing have a fuel pressure test done on it

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My car hesitates and slowsdown while driving


The fuel filter is in the gas tank with the fuel pump - it's actually a 'SOCK' that filters fuel before it enters the pump. Odds are it's not the filter. Odds are you have a Throttle Position Sensor which is going bad (bad spots in the potentiometer). Erratic resistance changes sending BAD signals to the Engine Control Module and Transmission Control Module ECU & TCM. A good technician knows how to check it with an analog ohm meter.

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You should definitely replace the fuel filter though this probably won't fix your hesitation. It wouldn't hurt to replace the spark plugs this is usually the culprit on these engine. I have the same engine in a '99 caravan and found the for some reason the spark plugs on cylinder 3 and 4 loosen up after one year and cause a misfire between 45 and 50 mph under load (when mildly accelerating).

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ya these motors need tons of fuel pressure so if you have a pressure tester test the fuel pressure prior to the fuel filter and see if it is atleast 25 psi if not replace pump with new or rebuild all the luck to you with current project

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2 Answers

99tahoe


check your fuel pump pressure 90-00 has fuel pump problems check your fuel pressure and see if its up to spec's on that year, Hope that helps you out...

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