Question about 1999 Oldsmobile Regency

1 Answer

1990 oldsmobile 98 error code 34 MAC

Car is missing and dies sometimes at stop. replaced ox sensor on manifold, and small idle motor on air intake.

Posted by on

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 4 Answers

There are 2 problems for code 34. First, is manifold absolute pressure(MAP) sensor signal voltage low. Second, Mass Air Flow (MAF)sensor signal-low airflow indicated.I dont have anything for the MAC.Hope this helps

Posted on Jul 06, 2009

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Oldsmobile security light


On your 3800 Olds motor, the crank position sensor can be the problem...located on the front of the motor harmonic balancer...but first try cleaning the Idle Air Control Valve...located in the air intake assembly...remove and spray clean with injector spray cleaner...clean the spring also...you can replace the IAC with a new one for about $35. Be sure to clean out the chamber too...wipe dry. Hope this helps.

Oct 23, 2013 | Oldsmobile 88 Cars & Trucks

1 Answer

What would be wrong with your 88 olds cutlas ciera if you're driving down the road and car dies and won't restart?


My car did this for a while until it would no longer move and I was told all sorts of things including cleaning (all the gunk near the MAF -hosing) which made it run for a month but did idle too high. So diagnose and get the codes from your car- the paperclip way (autozone cant cause its older than 1992).
Codes I pulled pertaining to this issue were 22 (Throttle Position Sensor- TPS Signal Voltage Low) , 23 (Air Intake Temperature- MAT Low Temp Indicated), and 34 (Mass Air Flow Sensor- MAF)
Easy to DIY with these 3 sensors

Apr 22, 2013 | 1988 Oldsmobile Cutlass Ciera

1 Answer

I have an Aurora.. It is not idling correctly. It sometimes will not shift gears until the 3000 RPMs, and it tries to die when you come to a stop. I have had the transmission rebuilt and replaced, the fly...


These symptoms indicate a vacuum leak. Check all vacuum lines attached to the engine intake manifold--especially any that go to the transmission. Check both ends with the engine running for tight connections and listen for leaks. Also look carefully over the intake manifold for any missing hoses--a port on the manifold that is sucking air. Let me know if you have questions and thanks for using FixYa.

Dec 21, 2010 | 1995 Oldsmobile Aurora

1 Answer

99 mercury sable automatic trans vehicle idles very low randomly even stalls out sometimes high idle occurs as well reaches about 4000 rpm at times. engine light threw 4 codes, all to do with o2 sensors...


Sounds like a broken or torn vacum hose, pcv valve clogged, or bad Idle air control motor. Did you spray carb cleaner on vacum hoses or near the plastic intake., and did the motor rev up or down? Those codes represent a lean condition which means most like a vacum leak or clogged idle air motor. Sometimes the intake manifolds crack or the intake manifold gaskets crack. FInd that vacum leak or inpect iac motor

Oct 28, 2010 | Mercury Sable Cars & Trucks

1 Answer

I have a 1990 olds 88 royale 3.8 Just replaced the fuel pump, and both fuel filter. A week later coming to a stop the car dies. It's seems every time I approach a stop and get under 25 mph it dies....


Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Jun 18, 2017 | 1990 Oldsmobile Eighty Eight

2 Answers

PO171 error code System too lean bank 1


Here are some possible causes, I would start with anything related to replacing the intake.

Air leaks in intake manifold, exhaust pipes or exhaust manifold
Fuel control sensor is out of calibration
Low fuel pressure (fuel filter clogged, pressure regulator failure)
One or more injectors restricted or pressure regulator has failed
O2 sensors contaminated, deteriorated or has failed
Vacuum hose is disconnected, broken, leaking or loose

Jan 28, 2009 | 2000 Oldsmobile Silhouette

1 Answer

Cold Start Idle Issue


Problem might be the air control valve, it's located at the right side rear of intake manifold and has a hose going to the air intake duct from the air cleaner, as a test you might try pinching off that hose when the idle is a problem.

Aug 17, 2008 | 1990 Subaru Legacy

1 Answer

Car keeps dying


Trouble Code 33 and 34 are the MAF/MAP Sensor Circuit. It sounds like you've replaced that sensor already. Did you also have the code 34 before putting in the new sensor?
Or did this code start after it's replacement? Any other codes appearing?

Troubleshooting it would depend if it has the Speed Density Update. The dealer should be able to provide that info.

Here's your fault code list:

13 oxygen sensor circuit 14 coolant temp sensor circuit (high temp) 15 coolant temp sensor circuit (low temp) 21 throttle position sensor (TPS) circuit (high signal) 22 throttle position sensor (TPS) circuit (low signal) 23 manifold air temp (MAT) circuit (low temp) 24 vehicle speed sensor (VSS) circuit 25 manifold air temp (MAT) circuit (high signal) 31 wastegate solenoid electrical circuit 32 exhaust gas recirculation (EGR) circuit 33 mass air flow (MAF) circuit (gm/sec high) 34 mass air flow (MAF) circuit (gm/sec low) 41 cam sensor circuit 42 C3I EST or bypass circuit failure 43 electronic spark control (ESC) circuit 44 oxygen sensor circuit (lean exhaust) 45 oxygen sensor circuit (rich exhaust) 51 PROM error 52 calpak error 55 ECM error

Aug 07, 2008 | 1989 Buick Regal

1 Answer

Truck wont start


Is it getting fuel?
is it getting spark?


as for the code.........here is the code list for gm vehicles



Code: Meaning:
12
No Distributor pulses
13
Oxygen sensor
14
Coolant Temp sensor circuit
15
Coolant Temp sensor circuit
21
Throttle Position Sensor
22
Throttle Position Sensor
23
Manifold Air temperature sensor
24
VSS (Vehicle Speed sensor)
25
Manifold Air temperature sensor
32
EGR system
33
MAP sensor or MAF sensor depending on engine
34
MAP sensor or MAF sensor depending on engine
35
Idle Air Control Valve
36
MAF Burn-off circuit
41
No Distributor pulses, cylinder select error
42
Electronic Spark Timing or Bypass fault
43
Electronic Spark Control fault
44
Lean exhaust
45
Rich exhaust
46
VATS system fault
51
PROM fault
52
CALPAK fault
53
System over-voltage
54
Fuel pump circuit
55
ECM fault
61
Oxygen sensor fault (degraded sensor)




Jul 17, 2008 | 1990 GMC Sierra

Not finding what you are looking for?
Cars & Trucks Logo

387 people viewed this question

Ask a Question

Usually answered in minutes!

Top Oldsmobile Experts

yadayada
yadayada

Level 3 Expert

77201 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22265 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8743 Answers

Are you an Oldsmobile Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...