I just got my car back together after sitting for 6 monthes. While it was sitting, I replaced the MAF with a used WELL's MAF. I would start it up every once in a while while it was sitting and never had any problems. The idle was good. Well, fixed my problem the other night. I have driven it a couple times, for short distances, with no problem. Today I went a little farther, and all of a sudden, I lost power. The car idles rough and is sluggish after 2nd gear. I keep getting a code 33 on the SES. Then I shut off the car. The next time I start it the SES light is gone and it runs great for a little while and then it loses power and the SES light comes back. Any ideas?
FBird

 

Try this out after you get the code 33 again.

1)Ignition off, Jumper ALDL terminal “G” to 12 volts using a fused jumper, Disconnect MAF Sensor, Probe harness terminal “E” (Ckt. 993) with a test light to ground.
Is the test light “ON” or “OFF”.
1a) “OFF”, Disconnect MAF power relay, probe (Ckts. 340 & 120) with a test light to Ground.
Light “OFF” on one or both, repair open in circuit that did not light.
Light “ON” both, probe (Ckt. 450) with a test light to 12 volts.
Light “OFF”, Repair open ground circuit.
Light “ON”, (Ckt. 993) open or faulty MAF Power Relay.
1b)“ON”, Remove jumper from ALDL connector, probe MAF sensor harness terminals “A” & “B” (Ckt. 450) with a test light connected to 12 volts.
Light “OFF” on one or both, Repair open in ground circuit that did not light.
2)Light “ON” both, Ignition “ON”, probe harness Terminal “D” (Ckt. 994) with a
Voltmeter, should read 0 volts. OK or Not OK
2a)Not OK, Disconnect MAF Sensor Burn-Off Relay, repeat test.
Not OK (Voltage Present), repair short to voltage in (Ckt. 994) from relay to MAF sensor or faulty MAF Power Relay.
OK (No Voltage), Probe relay harness (Ckt. 900) with a test light to 12 volts.
Light “OFF”, Faulty MAF sensor Burn-off Relay.
Light “ON”, (Ckt. 900) shorted to ground or Faulty ECM.
2b)OK, Ignition “ON”, Engine stopped, connect a voltmeter between harness terminal “C” (Ckt. 998) and chassis ground, should read between 4-6 volts. OK or Not
OK, Check all related connector terminals for making good contact, If OK, It is a faulty MAF sensor.
Not OK, (Over 6 volts), Ignition “OFF”, disconnect ECM A-B connector, Ignition “ON” repeat test.
Over 6 volts, repair short to Voltage in (Ckt. 998)
Less than 6 Volts, Check related Conn. Terminals and ECM ground Circuits, If OK, replace ECM.
Not OK, (Less than 4 volts), check for open (Ckt. 998), if circuit is not open,
It is a faulty ECM connection or ECM.


I will get you a PIC of the Circuitry for your MAF application tomarrow.

 

Here you go. Copy to your PC and resize it if you can't see the circuits. If that doesn't work I'll try finding a scanner.

 

Thanks alot. I'll give it a shot when I can get some time to troubleshoot. I didn't get a code on my way home today from work. I don't know what is going on with it.

 

One question did you gut the screens itself from the maf sensor?

 

No. I got the maf from a guy on this board. It is the Wells high flow one. I do not think it has screens though. I don't know if it came with them or not.

 

Check you're wiring. Make sure the wires leading to the MAF sensor, Power & Burn Off relays are not making their way out (look at the connectors very closely, you might detect a pulled wire from it's terminal), common.

The only way you'll know if it's due to the missing screens, is if you install a MAF sensor that still has them....