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My truck runs erraticly. i changed thi ais,map sensor,throttle posistion sensor what else would cause this

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Head gasket leak and is sucking in air somewhere rough running because extra air intake throwing off air/fuel ratio.gotta seal leak or for best result replace head gasket.

Posted on Mar 18, 2011

  • Rottweiller Mar 18, 2011

    sorry i appologiz i meant to say intake manifold gasket not headgasket.

  • jimmy_winfre Mar 19, 2011

    i just had a new intake manifold put on and i changed the map sensor,throttle position sensor and the ais . Could it be the fuel pressure regulator sensor cause the problem?

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Why is the engine running erratically?


the map sensor fail means (DTC code not stated sadly)
mean the voltage is stuck at 5v or 0v.
near
the ECU never lies about this, ever.
the ECU enters FAILSAFE mode , in this case. (limphome)
and runs rich has heck , horrid rich, misfires.
RPM limited
idle controls disabled.
and retarded spark timing.

pretty much worst of the worst for EFI ops.
all you need to do is post the DTC error. and all that is what matters.
new MAP time, or fix the vacuum hose. its clogged? cracked.
make sure the vacuum leaves the intake manifold (sucks) and
makes it all the way to the MAP on the fire wall and that the
tiny filter(check valve?) inline is clogged, (blown through it)

This is a G16A ENGINE, With an ECU that does not create or control spark, (old style distributor with mech, and vac, advance)

DTC 31 or 32??????????????????????
http://www.fixkick.com/CEL/CEL.html#OBD1codes

if vacuum line is breached to map , the vacuum is not 0" HG
the MAP outputs 3.9V

the ECU trip points i do not know. but
above 3.9 or below .5v it will trip... somewhere,

here is very good map , graph

http://www.fixkick.com/sensors/my-map.html


all testing of it is here
http://www.fixkick.com/sensors/tests/MAP-testing.html

with photos and how to back probe it with an volt meter.

Apr 29, 2015 | 1990 Geo Tracker

1 Answer

Erratic idle & shutting off


have you replaced the egr valve

Feb 08, 2014 | 1990 Ford F150

1 Answer

I have an 03 pontiac gtp supercharged. I have replaced the mass air flow sensor twice but after a while again I get erratic idle problems usually at first start up. this is a pieced together engine. The...


(1) clean the throttle assembly. They are very sensitive to build up also and they are very cheap change out the throttle body sensor. The TBS allows are to by pass both of these will cause erratic ideal. The mass air flow will not cause erratic idle but your car will be very loud and run rough. Failing this (cheap fix) I would suggest to look at the ignition coils.

Dec 24, 2013 | 2003 Pontiac Grand Prix GT

2 Answers

Cherry red exhaust


check that your map sensor is getting direct vacuum. if it's mounted directly on the throttle body, take it off and see that the vacuum passage is not clogged up. also check that it is getting voltage and that the computer sees it. Your map sensor and tps are responsible for how much fuel goes into the engine when you are driving; the o2 pretty much only regulates idle mixture. also see that your egr is not stuck open.

Mar 17, 2013 | Cars & Trucks

2 Answers

Replaced head gasket now it will not start?


was it the correct gasket? if its even off by a little it could def cause no start. if so the you need to check map sensor and also throttle posistion sensor

Oct 24, 2012 | Cars & Trucks

2 Answers

I have a jeep grand cherokee i have a code p1296. voltage missing at throttle position sensor.explanation engine running and the ecm detected map sensor voltage less than expected. probable cause open or...


I would change the TPS throttle position sensor and the Map/MAF are you sure its not the mass air flow?. I think your computer is fine it could be have a loose ground issues but computers dont go bad.

Sep 12, 2011 | 1997 Jeep Grand Cherokee

1 Answer

I have a p0105 error. They say this is a dirty body throttle. How can I clean this myself? My car is a 2002 Chevy Envoy.


DTC P0105 - Crankshaft Position Sensor B Circuit Malfunction or Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction


What does that mean?
The MAP (Manifold Absolute Pressure) sensor is part of the fuel management system. It reacts to changes in engine manifold pressure. The PCM (Powertrain Control Module) monitors the MAP sensor continually to properly run the engine. Changes in engine load require changes in the amount of fuel injected, and timing of the ignition system, etc. An engine under load has more manifold pressure(or less vacuum) than an engine that is coasting. As the load changes, the MAP sensor voltage signal to the PCM changes accordingly. To check the MAP sensor operation, though, the PCM watches other sensors to verify that the MAP sensor is working properly.

For example, the PCM compares the TPS (Throttle Position Sensor) signal to the MAP signal to verify the MAP signal isn't "sticking". If the PCM doesn't see a MAP sensor change immediately follow a change in the throttle pedal sensor, it knows there is a problem with the MAP sensor and sets P0105. Or, if the PCM notices that the TPS indicates the engine is under load, but the MAP signal indicates that the engine is "coasting" it, again, knows there is a problem with the MAP sensor or TPS and sets P0105.

Symptoms: Symptoms of a P0105 check engine light code may include:
* Poor running engine
* Engine runs rich
* Engine won't idle
* Engine backfires through tailpipe
* Engine misfire under load or at idle
* MIL (Malfunction Indicator Lamp) illumination
* In some extreme cases there may be no symptoms other than MIL illumination

Causes: A P0105 DTC could be caused by:
* MAP sensor vacuum hose disconnected or plugged
* Bad MAP sensor
* Bad TPS
* Damaged or problematic MAP sensor connector
* Damaged or problematic TPS connector
* Damaged wiring
* Short to reference voltage on signal circuit of MAP sensor
* Loss of ground to MAP sensor or TPS
* Open on signal circuit of MAP sensor
* Bad PCM

Possible Solutions: Using a scanner or code reader, turn the ignition on and engine OFF; what does the MAP sensor voltage read? It should be about 4 Volts for sea level. If you are at a higher altitude, it should decrease about half a volt or so for each 1,000 ft. of altitude (this will vary from model to model) Or if you have a separate MAF (Mass air flow) sensor on your vehicle, they are usually equipped with a Barometric pressure reading. If so, the Baro reading should match the MAP reading (they both measure ambient air pressure). If they're roughly equal, then, check for Freeze Frame data of the MAP sensor (if available).

NOTE: Freeze Frame data is the PCM recording a fault when it happens. It captures the readings of the various PIDS (parameter identifiers)available to troubleshoot what happened. It's like a recording of the problem as it happened. At idle a typical MAP sensor Voltage reading should be about a volt, and at WOT (wide open throttle) it should approach 4.5 to 5 Volts. As for the TPS, at idle, the voltage reading is about 1 Volt or less. As the throttle is opened the reading will increase to 4.5 Volts at WOT. Do the two readings make sense? For example, if the TPS reading on Freeze Frame data shows 2.5 Volts (indicating partial throttle) does the MAP sensor indicate a reading that isn't at either extreme? Using the Freeze Frame data (if available) compare the MAP reading to the TPS when the problem occurred. This can help you identify what happened

If you have no access to Freeze Frame data then check if the MAP sensor voltage changes when you apply vacuum to it. You can do this by mouth or a vacuum pump. The voltage should increase as you apply vacuum. If the reading doesn't change as you apply vacuum, make sure there are no obstructions in the hose to the sensor. If the hose is clear, the MAP sensor is usually bad, but it doesn't rule out the following from causing the problem: Does the MAP sensor appear to be stuck at less than .5 Volts? Then:

NOTE: This code shouldn't set if the MAP is stuck at extremely low voltage, however, I'm adding it in because there's no way to know for certain for which vehicles a low voltage condition may set a P0105.

1. Inspect the wiring harness and MAP sensor connector. Repair any damage
2. Unplug the MAP sensor connector. Also, at the PCM connector, remove the MAP sensor signal wire and check for continuity to the MAP sensor connector. If there is infinite resistance, then repair open in MAP signal circuit. If the signal wire has continuity to the MAP sensor connector, then check for 5 volt reference voltage to the connector and a good ground. If both are present, then re-install all removed wiring and replace the MAP sensor.

Does the MAP sensor appear to be stuck at full 4.5 voltage? Then:

1. Inspect the wiring harness for damage. Repair as needed
2. Remove the MAP sensor signal wire from the PCM connector. With a voltmeter measure the voltage with KEY ON ENGINE OFF. Is there 4.5 Volts? If so, unplug the MAP sensor and recheck. If it is still present, then repair short between the signal wire and 5 volt reference wire.
3. If unplugging the MAP sensor causes the voltage to disappear, check that the ground is intact. If it is, then replace the MAP sensor due to internal short.

MAP sensor codes include P0105, P0106, P0107, P0108 and P0109 .


Hope helps (remember rated this).

Jul 09, 2010 | 2002 GMC Envoy

1 Answer

1993 S-10 Blazer has erratic idle and stalls


Check the tps "trottle positioning sensor, on mine the idle would not stay steady, and shift so hard that it would sound like it was going to break something. it is located on the drivers side of the throttle body with a push in electrical connector.

Dec 06, 2009 | 1993 Chevrolet S-10 Blazer

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