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I have a 98 park avenue base that will crank over but wont start. tested all sensors and only code showing is o2. replaced the icm twice, air mass, battery, alternator,fuel filter and 1 coil pack, putting on a new crank sensor in the am. theres only 1 volt coming to the coils even the new one. it all started 2 months ago while sitting in a drive thru the whole front end started shaking so i changed my oil and thats when i put on the new air mass and the first icm on ran ok for a few days then started dying while idling and starting then dying unless the gas was held down and rpm was over 2000, then was staling and sputtering until again rpms was over 2000. seemed like it only acted up after it was warm till yesterday i was driving after finally getting it to start then it just dies and hasnt started since. any help would be appreciated what do you think is wrong?
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Did you replace the MAF sensor with a new one? What's scan data show? Did you hook up a scan tool? Check for DTC'S - diagnostic trouble codes? Check the sensors power and ground an signal circuits to the PCM/ECM? Do you know how to test a mass air flow sensor? Videos on youtube (Scanner Danner )
Not sure what the 45lb gas pressure is for. Fuel pressure ?? In most cases the code is for bank one O2 sensor out of range. There are about a dozen possible causes including a vac leak. The sensor is reading too much air in the exhaust based on the other engine readings. Things like a stuck PVC valve, leaking vac hose, leaking exhaust, leaking intake manifold, or even a failed O2 sensor.
Have you tried testing the ignition coil pack(s)? If this goes out then there wouldnt be any spark delivered to the plugs, this part is relatively cheap and is a common problem causing no spark.
Have someone take the mass air flow sensor off and clean it with a non-chrlonated brake cleaner.Make sure its dry before reinstalled and do not touch wire inside sensor with your fingers the oil from your fingers can damage it.
The crank and cam sensors would be a huge problem - the car wouldn't work if the sensors were at absolute nonfucntion, but you'd have issues if the sensor's issues were intermittent.
yes your right. it is a low circuit input code for a mass air flow sensor. you can try taking the mass air off and cleaning it good. sometimes it will help but normally they are just bad.
Be sure the four-letter code on your replacement ECM matches the one you removed.
The ECM relies on calibrations performed on some sensors while at the factory. For that reason there may be a switch or a sensor that is reading out of range.
If it seems to be running fine, drive it for a while and get an accurate measurement of MPG. Poor MPG will indicate that things like O2 sensor, MAP/MAF, TPS, IAC, IAT are not reading properly. Check for codes with a OBD-I reader.
The PCM doesn't even see the O2 sensor until engine temp has reached operating temp,the vehicle goes from open loop when cold,to closed loop when warm,where the PCM uses the O2 sensor to measure the rich/lean of the exhaust content,and from that,adjust fuel richness to achieve 14.7 to 1 air/fuel ratio.So when cold,the O2 sensor is out of the picture anyways.When unplugging sensors,it can be deceitful.The PCM has a program whereas,if a critical sensor (such as the mass air flow) is somehow damaged and out of the picture,the PCM will substitue a generic value that will allow the engine to stay running.So,by unplugging the MAF,it did try to run on it's own better than plugged in,there's the problem area.The vehicle is running better with the MAF unplugged,because the MAF is likely bad,and the PCM is substituting it's generic value when it IS unplugged.Something to recheckThe PROM update is a newer program for the PCM,and likely won't fix it unless the PCM is bad.I would try a good used PCM as a last or later resort,because i have seen my fair share of defective PCM's too.I have taken some PCM's apart,and found capacitors that had gone bad and leaked all over the circuit board,mostly Honda and Mitsubishi and Chrysler though.Good luck,keep me posted.
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