Question about 1994 Pontiac Firebird
This is a 3.4L V6, 5-speed, 167K miles. It started running rough, surging and hesitating. Mini vans were passing me on the right! I changed the plugs and wires. It ran great for about 2 weeks, then started to show the same symptoms as before the plugs and wires were changed in addition to smelling like it's running rich and plummeting fuel economy. I pulled the plugs out and 4 of the 6 were loose (couldn't find the torque wrench the first time), but all looked normal. Checked gap, all ok, torqued and reinstalled all plugs. Rd test, somewhat better, not much. No SES light on, went from about 20mpg to about 12. I'm thinking the oxygen sensors, but wanted another opinion before replacing things randomly. Also recently had new fuel filter, oil change, air filter. And if it is the oxygen sensors, how do you get them out? Even a deep well socket doesn't work. It needs a 3/4", there's not enough space to get a wrench to turn in there. Thank you!
Some other easy items to check. Remove and clean the MAF/MAP Sensor and the inlet to the thottle body with some brake cleaner/electronics cleaner. Also may want to try some Fuel Injector cleaner as well. The O2 Sensors usually require a special socket which you can buy at the local auto parts store, and you can also use a "Crowfoot" Wrench. Usually if the O2 Sensors are bad they will set off the Check Engine Light. Some other items to consider is a Rotor and Rotor Cap if you have a distributer instead of a coil.
Posted on Nov 16, 2008
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Mar 22, 2015 | Cars & Trucks
Mar 17, 2015 | Cars & Trucks
Jul 24, 2014 | 1986 Pontiac Firebird
Jul 22, 2014 | 2012 Subaru Outback 2.5i Wagon 2.5L 4-cyl....
Jan 21, 2013 | Cars & Trucks
Sep 21, 2017 | 1988 Jeep Wrangler
Here are the most common causes of idle surge, rough idle esp when cold, other symptoms include stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake
Jul 09, 2017 | Cars & Trucks
Mar 05, 2017 | Chevrolet Cargo Cars & Trucks
Jan 03, 2011 | 2005 Cadillac Deville
432 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: