Question about 1996 Chevrolet Blazer

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My blazer 1996 acts up when is cool the rpm gage gets crazy, after the engine is worm the engine works fine, map sensor is new, maf sensor, egr, tps, tune up , I don't know what to do I need help.

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  • Chevrolet Master
  • 9,587 Answers

Check the coolant temp sensor and the automatic idle module.

Posted on Nov 17, 2014

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

tripletauto
  • 1450 Answers

SOURCE: 2000 Ford F450 with V10

have you cleaned the throttle plate? this is done by removing air intake hose and spraying out with cleaner and wiping it down open throttle and wipe off the butterfly and bore. this will usually cure a stumble.

Posted on Aug 20, 2008

  • 160 Answers

SOURCE: RPM Oscillating

have you had the vehicle speed control reprogrammed if not that could be your problem

Posted on Nov 12, 2008

3mac
  • 61 Answers

SOURCE: 94 Automatic Geo Metro 3 Cyl. Map Sensor - EGR Valve

Unfortunately, both of these items are equally important and repairs can't normally be avoided by taking care of your car.

Your MAP (Mass Air Pressure) Sensor measures intake manifold vacuum pressure to help control the air and fuel mixture and timing. It contains a pressure-sensitive element that connects to an electronic circuit, generating a signal that changes with pressure changes in the manifold.

Your EGR (Exhaust Gas Recirculation) valve recirculates exhaust gases through the intake manifold to be burned again, cooling peak combustion temperature. Dilutes the air and fuel mixture to keep the nitrogen oxide emissions within breathable limits. And yes, it could very well be that the EGR solenoid that is causing the issue.

Both units effect your vehicle's fuel/air mixture. This is important because your vehicle running lean/rich can cause "snowball" problems. For example, a faulty EGR can cause the vehicle to run rich/lean. If not repaired, in time, the exhaust caused by the wrong rich/lean fuel mixture can damage the O2 sensors and/or catalytic converter.

If I had to pick, I'd start with your MAP Sensor. One guess I would have is that your MAP Sensor failed and made your vehicle start burning the wrong fuel/air mixture. Assuming I'm right, this could have damaged the EGR Valve. So, I see no reason to replace the EGR Valve alone, just so it too can be damaged by the poor fuel/air mixture caused by the still-faulty MAP Sensor. If your lucky, you may see the faulty EGR code disappear once your MAP Sensor is replaced.

Hope this helps and good luck!

Posted on Jan 12, 2009

  • 24 Answers

SOURCE: my 2001 3.9 dakota have a misfire condition at cold

My 2001 Dakota now works fine, I took it to a good reliable shop after much frustration. The problem was the crank position sensor in combination with an bad oxygen sensor. This was a very unusual problem with no consistency therefore hard to diagnose. Crank sensor $190.00 cdn oxygen sensor $130.00 cdn $300.00 in troubshooting, repair and diagnostics. Repaired by Gerald at AutoPro in Corner Brook, Newfoundland. Thanks Gerald

Posted on Apr 23, 2009

  • 1 Answer

SOURCE: High idle at start up low or high idle during driving

massair frow sensor

Posted on Dec 04, 2009

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99 Isuzu Trooper RPM keeps racing! These sensors have been replaced; TPS, IAC, CTS, no Vac. leak. The RPM still races at normal operating temp. What sensor tells the computer the RPM of the engine?


redux1
after many posts, we see only 1 clue engine
MAF
the 6ve1 engine
that told me what engines. one word, mAF.
if just one MAF (no map)
so all air leaks are slow rpm caused by lean
but if pcm goes in to limp home mode.
it car race, due to loss of IAC controls
the engine does not run like you think
the CMP/Cke sensors,
if they die , the engine dies.
if they misfire, the engine misfires and slows and stalls'

are you using good scan tools real that see all factory codes. p1, p2xxx?
not just fedcodes, p0xxx?

the 3.5v v6 has a MAP and a MAF BOTH.
on some engines like this, the Map is for idle
and the mAF of for fast.
fooling many machanics
dual mode systems,
the MAF sensor is not very accurate at idle
is the reason for the dual mod
so vacuum leaks, I SAY.

Mar 01, 2017 | Isuzu Cars & Trucks

1 Answer

95 Blazer replacing TPS


The TPS (Throttle Position Sensor) is actually easy to replace - it is located on the throttle body on the engine and is attached to the throttle linkage and flapper valve inside the throttle body. If you have a decent code scanner, you can actually view the position of the throttle as you move the linkage to see if it is tracking linearly with no gaps. This condition can also be caused by a stuck or faulty EGR (Exhaust Gas Recirculation) valve, regardless of its age. Recheck all codes to be sure you are still getting these errors.

Mar 05, 2017 | 1995 Chevrolet Blazer

2 Answers

2003 kia Sedona at a cold start the rpm runs very high and it will take over 2 minutes before its slowly starts to drop.


TPS, IAC, EGR, MAF, MAP. all sensors all having to do with the way the car starts and runs. Does it idle fine after warm up or does the idle jump up and down, or does it go so low sometimes, you think it's going to die on you? I'd look at the TPS and IAC 1st. Go to autozone or advanced auto parts and have then plug the OBD II code reader into your ECU and see if they can pull a code.

Nov 01, 2013 | Cars & Trucks

2 Answers

1996 lincoln towncar stalling in traffic


Most common cause is a bad TPS (Throttle Position Sensor). The TPS controls your throttle speed under all conditions. Another possibility could be either the MAF (Mass Air Flo) sensor, or a dirty EGR valve but TPS usually cures your problem.

Apr 24, 2012 | Lincoln Town Car Cars & Trucks

1 Answer

When starting my 95 camaro and the rpm drops to idol my car vibrates like it is not getting enough gas and acts like it will shut off


Is the RPM correct,should be 800RPM, You have a MAF (mass air flow) and a MAP sensor,also a IAC.(Idle air control) Depending on the engine size you have both a MAP and MAF, so basically you need to inspect for a broken vacuum line at the MAP sensor,you also need to look for false air,which is a broken vacuum hose affecting the idle.3_17_2012_3_31_56_am.jpg

Mar 16, 2012 | Cars & Trucks

1 Answer

I have problem in chevy silverado model 2008 trouble cods p0101-p0401 can any body help???


P0101 - Mass Air Flow (MAF) Circuit Range/Performance Problem
Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. The PCM detects that the actual MAF sensor frequency signal is not within a predetermined range of the calculated MAF value for more than 4.0 seconds. Other MAF sensor circuit DTC trouble codes are P0100, P0102, P0103, and P0104.

Symptoms: You will likely not notice any serious drivability problems, although there may be symptoms.

Possible Solutions: The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures:
* Inspect for the following conditions:
An incorrectly routed harness--Inspect the harness of the MAF sensor in order to verify that it is not routed too close to the following components:
- The secondary ignition wires or coils
- Any solenoids
- Any relays
- Any motors
* A low minimum air rate through the sensor bore may cause this DTC to set at idle or during deceleration. Inspect for any vacuum leaks downstream of the MAF sensor.
* A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor g/s display on the scan tool to increase rapidly. This increase should be from 6-12 g/s at idle to 230 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system.
* The barometric pressure (BARO) that is used in order to calculate the predicted MAF value is initially based on the MAP sensor at key ON.
* When the engine is running the MAP sensor value is continually updated near WOT. A skewed MAP sensor will cause the calculated MAF value to be inaccurate. The value shown for the MAP sensor display varies with the altitude. With the ignition ON and the engine OFF, 103 kPa is the approximate value near sea level. This value will decrease by approximately 3 kPa for every 305 meters (1,000 feet) of altitude.
* A high resistance on the ground circuit of the MAP sensor can cause this DTC to set.
* Any loss of vacuum to the MAP sensor can cause this DTC to set.

If you suspect the condition may be related to aftermarket accessories, refer to Checking Aftermarket Accessories in Wiring Systems.

Check this it is here as an aid in resolving your P0101 trouble code (DTC)...

P0401 - Insufficient EGR Flow
EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.

Symptoms: You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.

Causes: A code P0401 most likely means one or more of the following has happened:
* The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
* There is a blockage in the EGR (tube), most likely carbon buildup
* The EGR valve is faulty
* The EGR valve may not be opening due to a lack of vaccuum

Possible Solutions: In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
* Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
* Clean out the EGR valve and/or tubing to remove deposits
* Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
* Replace the DPFE sensor (with a good quality / OEM one)
* Replace the EGR valve


Keep us updated.

Jan 11, 2011 | 2008 Chevrolet Silverado 3500HD 2WD

2 Answers

When i take my foot off the gas pedal my speed drops a lot and van acts funny what could it be


FUEL PUMP IF BY FUNNY YOU MEAN IT STALS AND IT FEELS LIKE IT S GOING TO TURN OFF .
ALSO TRY THE IDLE SENSOR

Apr 19, 2010 | 1998 Ford Windstar

2 Answers

96 grand prix is surging and stalling. I have replaced the fuel pump within the last year, the EGR, the IAC, had the throttle body cleaned, and new plugs and wires. The check engine light comes and goes...


Get a free code at AutoZone or some other place. It could be one of the many sensor problems. Especially the idler sensor or Map, Maf, and on from there.

Nov 06, 2009 | 1996 Pontiac Grand Prix

2 Answers

Throttle/Idle/running problem - wants to run too fast, or stall out


RPM's up and down check EGR valve and sensor. EGR valve and sensor control idle. That's why your getting the surging on rpm's and this could be giving out the other codes. If mass flow was bad car will not start and the same for the map sensor. O2 sensor measures gas and air for right mixer. TPS controls 0-60 speed as in throttle respons.

Apr 28, 2009 | 1989 Pontiac Grand Prix

1 Answer

1988 Dodge Aries K 2.5L Engine Trouble and codes


CODE 14
Trouble Code 14 indicates that the Coolant Temperature Sensor (CTS) is reporting abnormally high readings. CTS is used to control fuel mixture, timing, idle speed, TCC and EGR operations among others. The thermistor used has a low resistance when hot, rising as the coolant cools. This error then, indicates a very low resistance in the CTS circuit.
CODE 15
Trouble Code 15 indicates that the Coolant Temperature Sensor (CTS) is reporting abnormally low readings. CTS is used to control fuel mixture, timing, idle speed, TCC and EGR operation, among others. The thermistor used has a high resistance when cold, lowering as the coolant warms. This error then, indicates a very high resistance in the CTS circuit.
CODE 33
Trouble Code 33 indicates that the Mass Air Flow (MAF) sensor is reporting more air is entering the engine than makes sense based on RPM and TPS. The MAF sensor produces a frequency output; around 30 Hz at idle to 150 Hz under acceleration. The frequency varies proportionally to airflow. The ECM monitors the frequency and thus determines airflow into the engine. Typical idle MAF is 5 to 7 grams per second.

Mar 30, 2009 | 1988 Dodge Aries

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