Question about 1999 Pontiac Sunfire

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1999 Pontiac Sunfire hestitation problems

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: jpmorgan@mts.net ph: 204-467-9371

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  • Prairie John May 19, 2008

    Thanks so much!! This car does have an after market alarm & remote start. I sometimes have wondered about how well they were installed. I'll try what you say and see what happens. It's never had problems starting, even in very cold weather (-30). Thanks again for your help. All the best!!

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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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I have a 2003 chevy S-10 4x4 crew cab we are wanting to tow behind a motor home. I was wondering how you can put the transfer case into neutral, so we dont have to car dolly it everywhere?


Some customers may want to tow their vehicle behind another vehicle with all FOUR tires on the ground. This is referred to as "dinghy" towing.
Towing in this manner is acceptable only on the certain vehicles. The vehicle should be properly equipped and prepared as described below.
The passenger cars listed above are the vehicles that CAN be dinghy towed. Passenger cars not listed above are vehicles where dinghy towing is not permitted or recommended.
Certain 4WD trucks can be dinghy towed depending on the transfer case option. Rear wheel drive and AWD trucks should NOT be dinghy towed. Refer to the truck models and transfer case options below.
Please refer to the applicable vehicle Owner's Manual before towing.
Passenger Cars Notice: These vehicles must not be towed backwards or transmission damage may occur.

• 1995-2005 Chevrolet Cavalier, Pontiac Sunfire and 1996-2000 Toyota Cavalier equipped with Hydra-Matic® 4T40-E Automatic Transmission (AT) (RPO MN4) or 5-Speed Manual Transmission (MT) (RPOs MK7, MJ1, M86, M94) • 1995-2005 Pontiac Grand Am equipped with Hydra-Matic® 4T40-E or 4T45-E AT (RPOs MN4, MN5) or 5-Speed MT (RPO MJ1, M86, M94) • 1995-1998 Oldsmobile Achieva equipped with a 5-Speed MT (RPO MJ1) • 1997-2003 Chevrolet Malibu, 2004-2005 Chevrolet Classic and 1997-1999 Oldsmobile Cutlass equipped with Hydra-Matic® 4T40-E AT (RPO MN4) • 1999-2004 Oldsmobile Alero equipped with Hydra-Matic® 4T40-E or 4T45-E AT (RPOs MN4, MN5) or 5-Speed MT (RPOs MJ1, M86, M94) • 1994-1997 Geo Tracker / 1998-2004 Chevrolet Tracker 4WD models equipped with 3L30 or 03-72LE AT (RPOs M41, M65, MX1) or 5-Speed MT (RPO M59) • 2006-2007 Chevrolet HHR • 2005-2007 Chevrolet Cobalt, Pontiac Pursuit • 2005-2007 Pontiac G6 (excluding 3.9L V6 AT) • 2007 Pontiac G5 • 1995-2005 Chevrolet Cavalier, Pontiac Sunfire and 1996-2000 Toyota Cavalier equipped with Hydra-Matic® 4T40-E Automatic Transmission (AT) (RPO MN4) or 5-Speed Manual Transmission (MT) (RPOs MK7, MJ1, M86, M94) • 1995-2005 Pontiac Grand Am equipped with Hydra-Matic® 4T40-E or 4T45-E AT (RPOs MN4, MN5) or 5-Speed MT (RPO MJ1, M86, M94) • 1995-1998 Oldsmobile Achieva equipped with a 5-Speed MT (RPO MJ1) • 1997-2003 Chevrolet Malibu, 2004-2005 Chevrolet Classic and 1997-1999 Oldsmobile Cutlass equipped with Hydra-Matic® 4T40-E AT (RPO MN4) • 1999-2004 Oldsmobile Alero equipped with Hydra-Matic® 4T40-E or 4T45-E AT (RPOs MN4, MN5) or 5-Speed MT (RPOs MJ1, M86, M94) • 1994-1997 Geo Tracker / 1998-2004 Chevrolet Tracker 4WD models equipped with 3L30 or 03-72LE AT (RPOs M41, M65, MX1) or 5-Speed MT (RPO M59) • 2006-2007 Chevrolet HHR • 2005-2007 Chevrolet Cobalt, Pontiac Pursuit • 2005-2007 Pontiac G6 (excluding 3.9L V6 AT) Towing Procedure Notice: Failure to follow these instructions may result in damage to the transmission.
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Engine oil type and capacity for 1999 Pontiac Sunfire SE


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