Wont start unless i hold the gas pedal to the floor. Starter tests out fine along with my fuel pressure, battery, alternator. Before starting i get the battery light and oil light yet all is fine. Once it does start i get a code reading System to rich (Bank1). code P0172. I suspect my CAT or MAF. Every time it starts i get a lot of carbon shooting from the exhaust also. Idles really rough has new CAM, crank, and Bank one 02 sensors. Due to system being to lean from previous code. Any ideas or trouble shooting?
Look at the oxygen sensor. If the map was bad you'd get a overheated catalytic converter.
SOURCE: my 97 buick stalls some time and wont start for while
code po 171 system lean on bank one on 2002 buick lasabre
SOURCE: Hard start when cold, running rich, poor fuel economy
Chrysler has a bulletin out for a simular condititon that involves replacing the pcm. Heres the bulletin number 18-005-04. This is only 1 possible cause , Fuel pressure, coolant temp sensor, thottle position sensor all can cause like problems. Seeing sensor values and fuel adaptives with a scan tool helps pin point problems.
SOURCE: check engine light
It might but what exactly are the codes. Before you change the Mass air flow sensor, try cleaning it first with a can of mass flow cleaner.
If your running a oil K&N filter, there could be some oil residue on the sensor. Start with that and change the filter or clean it if it's a K&N.
The O2 sensor's could be bad also, you really need the code's to be sure what sensor is giving you the faulty signal.
Good luck and hope this helps.
SOURCE: Oldsmobile Delta 88, Idles High on Cold start with DTCs
Sounds like a vacumn leak. Gasket under intake plenum may be leaking. Be sure the pcv valve has the o-ring around it in the correct place also as it will set a code.
SOURCE: 2001 Tacoma running rich but the scanner is reading a lean code
No, disconnecting the sensor and seeing no change would be a indication the maf was bad. Your computer takes information from your mass air flow sensor (maf), o2 sensor, cam position, and knock sensor to regulate the correct mixture. I would suspect a bad o2 sensor upstream. Try taking off the o2 sensor and seeing if there is black carbon on the base of the o2 sensor. If it has black carbon on the base it could be a bad o2 sensor. This problem could also be easily solved by hooking up a mechanics diagnostic computer to pin point the problem. Sometimes, you can clean the mass air flow with a special cleaner to help it generate a more accurate reading.
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also really really bad gas mileage. And very little power.
2004 Pontiac Grand am 2.2 L
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