1990 Buick Century reading code 33

[headlice1]

Code 33 on a 1990 Century. This is a MAP sensor voltage too high. Only problem is, the 1990 doesnt have a MAP sensor!!!! WTF?!? Car runs fine cold, but when it is warmed up it clunks out every single time! Would be consistent with a MAP sensor, only problem is I cannot find it and every parts store that I called asking for a MAP sensor say they dont show this model having one! HELP!

[tri-power]

Code 33 is also MAF sensor or circuit.

[HotZ28]

The following codes are for the 1990 Buick, and do not show a code 33! Is it possible that it was missread? Advanced auto parts shows a MAP sensor for the 1990 Buick Century, Part # listed below.

1990 BUICK CENTURY LIMITED V6 3.3 Liter FI
1990 BUICK CENTURY CUSTOM L4 2.5 Liter FI
GP Sorensen 77911502

www.partsamerica.com

(Generic Code 33 =3 flashes, pause, 3 flashes MAF Sensor Have the mass air flow sensor replaced)


Diagnostic Trouble Codes - 1990
Buick
13 Open Oxygen Sensor Circuit
14 Coolant Temperature Sensor (High Temp Indicated)
15 Coolant Temperature Sensor (Low Temp Indicated)
16 System Voltage High
21 Throttle Position Sensor (Signal Voltage High)
22 Throttle Position Sensor (Signal Voltage Low)
23 Manifold Air Temperature (MAT) Circuit (Low Sig.)
24 Vehicle Speed Sensor (VSS) Circuit
25 Manifold Air Temperature (MAT) High Temp Indicated
26 Quad-Driver (QDM) Circuit
27
28 Gear Switch Diagnosis
28
29 Gear Switch Diagnosis
31 Park/Neutral Switch Circuit
34 Mass Air Flow Sensor (MAF) (GM/SEC Low)
38 Brake Input Circuit
39 Torque Converter Clutch (TCC) Circuit
42 Electronic Spark Timing (EST) Circuit
43 Electronic Spark Control (ESC) Circuit
44 Oxygen Sensor Circuit (Lean Exhaust Indicated)
45 Oxygen Sensor Circuit (Rich Exhaust Indicated)
46 Power Steering Pressure Switch (PSPS) Circuit
48 Misfire Diagnosis
51 Mem-Cal Error
66 Low A/C Refrigerant Charge
69 A/C Head Pressure Switch Circuit

[headlice1]

MAF sensor? I used a computerized diagnostic scan tool. It told me it was a MAP sensor; must have just been gerneralizing...

Anyway, I will take a look at the MAF sensor and post an update. Thanks guys.

BTW, HotZ28, I looked at the link you posted and yes, they do sell a MAP sensor for the 3.3L (thats what I have) on the Limited Century. I cannot explain it. Check out Rockautoparts.com. They just sell the pigtails and not the sensor!?!?!

I am hoping its a MAF sensor....

Update...My car doesnt even start at this point. I had it running on the computer diagnostic to read the trouble codes, turned it off, tried to start it up again and it wont...

[HotZ28]

Do you have spark or fuel?

[headlice1]

Update:

It was the MAF sensor. The car does not have a MAP sensor.

Someone on another forum told me to have someone crank the engine while I hit MAF sensor w/ something hard. Car started right up, so that was the problem.

Replaced the MAF sensor, and car runs great, except for stalling before the car is warm. I am probably going to replace plugs and wires to see if that corrects it.