My 1990 buick regal 3.1 starts n idles but when i touch the gas it falls on itself and dies.. the computer said map sensor, so i got a new one and it does the same thing.. now the computer is saying map sensor volts high and map sensor volts low.. can someone please give me some advice????

SOURCE: 1990 buick regal 3.8L- Backfires, stumbles on acceleration

most likelly it is your fuel pump is not puting godd fuel pressure
have the fuel pressure test and if it is low have the fuel pump and filter replaced

SOURCE: 1991 buick regal , 3.8lt,

1991 3.8 liter engines used a Mass Air Flow sensor in the intake tract (measures incoming air) instead of a MAP sensor. The MAF sensor is located on the engine just behind where intake hose is attached.

SOURCE: Where is the map sensor in a 98 buick regal ls?

should be on or near breather box

SOURCE: '89 buick regal replaced ECM, 02sens, IAC, MAP

have you tested the fuel pressure . should be about 35 lbs while idling and theres also the maf sensor mass air flow

Greg Bernett

• 2993 Answers
• Posted on Jul 23, 2009

SOURCE: Need to remove the dashboard bezel and instrument

Regal 1988–94 MODELS

1. Disconnect the negative battery cable.
2. Remove the instrument panel pad:
3. Carefully pry the speaker grilles and disconnect the Daytime Running Lamp sensor if equipped.
4. Remove the screw under each speaker grille.
5. Remove the screws at the lower edge of the instrument panel pad.
6. Remove the pad by lifting the front and pulling toward you to release it.
7. Remove the speakers
8. Remove the instrument cluster.
9. Remove the glovebox.
10. Remove the right side sound insulator.
11. Remove the climate control system switch panel and sound system controls.
12. Remove the English/Metric switch.
13. Remove the lights switches.
14. Remove the cassette deck or compartment that replaces it if not equipped. Remove the ashtray and bracket.
15. Remove the ALDL connector and allow it to dangle below the instrument panel.
16. Remove the parking brake release handle and allow it to dangle below.
17. Remove the remote radio receiver.
18. Remove the steering column trim plate and lower the steering column.
19. Remove 7 bolts holding the carrier (5 at the top and 2 at the bottom). Remove the 2 bolts above the steering column.
20. Remove the 5 screws holding the main air duct.
21. Remove the 3 nuts holding the conduit. Two are above the glovebox and the other is through the cassette/compartment opening.
22. Disengage 9 clips holding the wiring harness.
23. Have a helper assist you, and remove the instrument panel assembly from the vehicle. To install:
    
24. Carefully install the instrument panel to the vehicle. Be sure to clear all wiring, etc.
25. Engage the clips holding the wiring harness.
26. Install the 3 nuts holding the conduit.
27. Install the screws holding the main air duct.
28. Install the bolts holding the carrier.
29. Secure the steering column and install the trim plate.
30. Install the remaining components in the reverse of the removal procedure.
31. Connect the negative battery cable and check all items in the instrument panel for proper operation.