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Automotive Repair Car Troubleshooting Topics   Car Troubleshooting   Engine Troubleshooting   Engine Fault Codes   Electrical and Wiring   Transmission Problems Car Repair Topics   Car Making Noises   Car Stereo Repair   Heating or AC Issues   Motorcycles and ATVs   Tricks of the Trade   Truck Repair Advice Site Options:      Login   Sign up here! Latest Forum Post   2011 Dodge Nitro OBD scanner seems to drain battery in 10-20 minutes When I bought this car in summer 2023, a... Grounding Cable, 2017 Jeep Renegade Trailhawk The Cable that connects my negative batt... Rough Idle (Found new thing) Hi everyone. First of all sorry for bad ...     equipment hey yall. im a first year engineering st...   HELP I have a 1956 1/2 ton panel truck, 69 35...   Howdy     Just wanted to s...   ABS/Tractiob/Brake Lights on But No DTCs Hello all, Recently while driving m...   Chevy strut replacement I'm trying to get a sensor of some kind ...   2020 suburban new transmission and issues after install recently had the transmission fail at 11...   Caliper piston post cleaning won't screw in Hello, 2013 Hyundai Elantra limited (ma...

Search Auto Parts Search 2002 Grand Prix Idle Issue and Poor Gas Mileage Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Engine Troubleshooting Jon66238 New User Mar 6, 2017, 10:01 PM Post #1 of 4 (1471 views) 2002 Grand Prix Idle Issue and Poor Gas Mileage Sign In So I have a 3.1 liter 02' Pontiac Grand Prix that needs some help. Sometimes it rough idles when in park and sometimes it wants to go when at a stop light/sign. It normally idles at 1100 and sometimes (rarely) at 800-900. I really want this fixed but don't know what to do anymore. Also, it gets absolutely terrible gas mileage, if that helps to figure out the problem. Thanks for any responses. Tom Greenleaf Ultimate Carjunky / Moderator Mar 6, 2017, 11:19 PM Post #2 of 4 (1459 views) Re: 2002 Grand Prix Idle Issue and Poor Gas Mileage Sign In None of those idle speeds are normal. First step and should hurry is to get full code readings and post the #s. I say "hurry" as when you are not running well and wasting fuel you probably are taking out the converter ($$$$) at the same time, T Jon66238 New User Mar 9, 2017, 8:48 PM Post #3 of 4 (1434 views) Re: 2002 Grand Prix Idle Issue and Poor Gas Mileage Sign In The main code is P0121. The other codes have something to do with the ABS brakes which are not hooked up due to personal preference. Tom Greenleaf Ultimate Carjunky / Moderator Mar 10, 2017, 2:49 AM Post #4 of 4 (1430 views) Re: 2002 Grand Prix Idle Issue and Poor Gas Mileage Sign In Code for TPS circuit means test the ohms watching it sweep while moving the throttle first to me or that it's properly hooked up at all. ABS has nothing to do with that IMO and just pulling the fuse on it will revert back to plain braking action and a light to amuse you will stay on. That's a separate thing not part of the poor fuel mileage, T   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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