Question about 1995 Chevrolet Camaro

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TPS ISSUES! First off I had to buy a new TPS and a MAP sensor for my 1995 5.7 Automatic Camaro. The car idles at 1500 which extremely high and when I shift out of park it jerks the transmission around. The car won't shift out of 1st until 25 or 30mph at 3000rpm, out of 2nd at 48mph or a little over 3000rpm, out of 3rd gear at 65mph and around 3000rpm. When I unplug the TPS while it is running the idle doesn't even change, I need to know what tool i need to check the volts in the throttle, and if that isnt the issue, what do I need to do further. I just bought a new ECM for it thinking it would help and it didn't. Please give the best explination or solution I can do so I don't need to spend anymore money on useless solutions and gas from it shifting so late! Thanks!

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Well its not the ECM that is not the fault the map sensor as well. Check the throttle control arm to see if there is any wear. To check the volts on that you need a volt meter. the trottle is the issue, and it looks like your doing all the repairs as a DIY. You need to check several things because the trottle is ran on a sensor your going to need to test that as well. Useless solutions is not so useless because your doing it as a DIY do it yourself and it can get costly if your just guessing. Hook this thing up to a computer and check it for faults. You can get a computer for like $45 at
Run the codes and see wht it comes up with.


Posted on Apr 24, 2009


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2005 Dodge Ram 1500 4.7 Engine. Starts fine, Idles fine, but when engine shifts into high gear and RPM lowers engine runs really rough under load

Have you checked for a broken valve spring. Repaired a dodge engine with the same running issue as you have described and it was a broken intake valve spring.

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I rebuilt the 305 TBI in my 1989 Camaro. When I turn it over it fires up, but stalls almost immediately. The SES light says there is either low vacuum/high watts, or high vacuum/low watts to the MAP...

You have codes 33 and 34?
Either way, since you were in there with the motor apart you may want to check all your hoses. Maybe you have the MAP connected in the wrong place. The poor running condition could be the cause of the codes being set. The ECM is pretty smart. If the MAP sensor was at fault the ECM would know and use a the TPS position in its place.
Vacuum leak maybe???

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95 cadillac reading code current p105 sometimes engine light comes on sometimes harder to start than normal, idles up and down up on stopping

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.

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1 Answer

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Hope helps (remember rated this).

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