Question about 1999 Pontiac Sunfire
Our '99 Sunfire 2.2L, 5 speed, 191,000 km, no A/C, sunroof, well looked-after, developed a significant hesitation upon acceleration last summer. It feels like water in the gas, and is intermittent in all kinds of waether: wet, dry, winter, summer. This car is mainly driven on the highway. Two excellent mechanics have done everything possible: throttle position sensor (twice), crankshaft sensor, cleaned wiring & connections to main computer, new fuel filter (twice), new, best quality plug wire set (3 times), new best quality sparkplugs (3 times), air filter, replaced #4 fuel injector even though it had no problems and neither did any of the other FI's, many tanks of different gas of different octanes, & added methyl hydrate & fuel conditioner several times. I have taken it out twice for long city & hwy drives with a code reader from our last mechanic, and although it hesitates so badly it almost stalls, no codes are ever recorded. Our mechanic has done the same and never been able to record a code. The only thing left that any of us can think of is to replace the main computer. Will this do the trick? Thanks so much!! John Morgan, Argyle, MB Canada email: email@example.com ph: 204-467-9371
I would have an electrical system check done on this car.. I would check the alternator to make sure the output is what it is rated at. I would then have a parasitic draw test done. What that is is when the car is off and it had sat for say 1/2 hour to make sure there is nothing in the car that is keeping an excessive drain on the battery. if you have anything after market on this car alarm/amp for radio etc. The car has a base draw that in minimal. It's to keep the colck radio memory going and the computer memory for the engine computer.. Next thing I'd check is the starter motor make sure that is doesn't have an excessive drain when cranking the car.. LAst thing would be the battery cables. If you have high resistance in either cable it will "rob" the starter of the necessary amerage to crank the car over. And tempature has a HUGE roll in this. If the cables already have excessive resistance in them and you warm the car up from the outside temp. it will make the problem worse. If you had a battery thta went bad and was leaking acid out of the the posts that acid wicks it's way into the cabes and that's where the problem started... I would also next battery you buy get one with a higher cold cranking amperage and a longer reserve capacity. Good luck :)
Posted on May 19, 2008
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Posted on Jan 02, 2017
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