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Benton Rodeheaver Posted on Jan 30, 2015
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Need help troubleshooting 89 omni?

Hard starting/no start.It acts like it did bafore replacing the map sensor along with a host of other sensors including the brain and harness. Installed used injector since new was too expensive(laid off).

2 Answers

Robert Swatek

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  • Dodge Master 450 Answers
  • Posted on Mar 28, 2015
Robert Swatek
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Check for spark
also, don't rule out a bad injector just because you replaced it,
I repaired a car that the dealer gave up on saying they could not fix and found that the brand new injector they put in it was no good

brucec30

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  • Expert 42 Answers
  • Posted on Feb 03, 2015
brucec30
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You need a scanner. Does the PCM see the engine cranking?
Are the injectors firing (evidence PCM see's engine cranking)?
Does the system show it is firing? This is things you need to know to diagnosis a a no start/hard starting engine.
I've seen Dodges not seeing engine crank due to bad crank sensors. Usually jeeps.
Good luck and ask more if needed?

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5 Related Answers

Anonymous

  • 1201 Answers
  • Posted on Jan 30, 2009

SOURCE: car has no spark or injector pulse(new ecm,crank sensor)

Check the fuse for the injectors, some vehicles have the injectors and coil running on the same circut, at the same time check the fuse for the ignition.

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Anonymous

  • 702 Answers
  • Posted on Feb 12, 2009

SOURCE: 1999 Dodge Intrepid Dies while driving and sometimes won't start

I could very well be the TPS throttle position sensor acting up. I had a very similar situation on a 99 Concorde with the same engine in it in my shop today. Go to a shop that is able to do a data stream on the engine. What it is, is they hook up a scanner and have the ability to watch all the sensors as the car starts/runs.

Anonymous

  • 3 Answers
  • Posted on Apr 21, 2009

SOURCE: 1994 Dodge Ram 1500 5.9 (360) won't start new fuel pump, coil??

Maybe check ignition control modual.

Anonymous

  • 316 Answers
  • Posted on Apr 27, 2009

SOURCE: location dodge 1500 4x4 5.2 1996 map sensor

Your map sensor is mounted on the throttle body. This is what you're looking for.a2184d5.jpg

Anonymous

  • 145 Answers
  • Posted on Jun 10, 2009

SOURCE: CAM SENSOR ENGINE LIGHT. MAX RPM 2000 SOMTIMES

I seen this before first of all don't let the car dealer to BS the way to your money, most of the time is noting wrong whit the sensor it self but is the plug than goes in to the sensor this what i recommend is to buy another sensor from your local auto part store or salvage yard (cheaper) get three pieces of cable and solder directly in to the sensor brake the plastic around the sensor plug if necessary and secure the three cables to it put some silicon in between the solder and the place the new sensor on top of the old one so you now wish wire goes to which and cut and attach one by one. I now this works 100% i have done it my self many times if you need diagrams or sensor locations you can find that at www.alldatadiy.com now if you still have problems unplug all harness especially all the ones than comes from the back of the engine because that engine tends to leak oil on top of the harness if you have wires doing shortcut replace that section you can solder use heat string tube and change the insulation hose they sale those on part stores to put some zip tides on the ends and you will have your car back and will last Note don't let it get to close to the exhaust use zip tides to keep from touching hot areas.

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My blazzer just had the fuel pump replaced, and now it starts but won't stay running/ before the fuel pump went out it never had a problem starting / they told me that it might be the Map sensor, what are...

what year? a bad map sensor will cause rough running and sputtering and very bad smell like a rotten egg smell through the exhuast. try tapping on it lightly with a scewdriver when running or trying to start, if it acts up when tapping, that is the cause and very easy to replace. when the fuel pump was replaced, you need to replace the fuel filter. the filter clogging is almost always the cause of the pump going bad.
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91 chevy 4.3 v-6 runs extremely rich when engine is cold gives codes 13, 33 and 54 I know what these codes are but I need to know is could the computer coolant temp sensor or the air cleaner temp sensor...

DTC - 13 Oxygen sensor circuit open or no activity
DTC - 33 MAP sensor circuit error (signal high indicating low vacuum)
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Start with checking the wire leads to the O2 sensors and MAP sensor. Look for any damages to the wire harness and replace any parts damaged or faulty.

The O2 and MAP sensor take reading and sends it to the ECM to recalibrate the fuel injector pulse to adjust the amount of fuel entering the cylinders. When there is an issue to the O2 sensor or MAP sensor and even both, the ECM will be set a a factory default to run rich to keep the engine running and at times the engine may not even run. Normal fuel to air ratio is 14.7:1 - 14.7 air to 1 parts fuel and at default it could be as high as 12.5:1. Good luck and keep me posted, be glad to help you get your truck running 100% again soon and please rate. replacing the thermostat and temperature sensor would also be a good thing since the 4.3 runs best at 190".
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Hello! when you say just about everything ; Can you give a brief run-down of what you have done? If you have not checked all vacuum lines for breaks, worn, pinched or loose;Please do so...

There are three very probable causes; Lets eliminate...

#1 Manifold Absolute Pressure sensor (MAP)...Located on the throttle body...Using a volt meter, Measure across pins...Must be greater than 1 volt at idle...If not it's faulty...

#2 Throttle Position Sensor (TPS)...located at the throttle body...Using a volt meter, measure the voltage at the sensor...Must be less than than 1 volt at idle...As you slowly increase the throttle the voltage must rise smoothly to 4 volts at full throttle...If it skips or jumps the TPS is defective...

#3 The Air Control Temperature sensor (ACT)...Located in the top of the air filter box (It is usually green in color)...unscrew the sensor...Inspect the tip for dirt and contamination...If contaminated the sensor is defective...

Send a comment when complete....

Guru...................saailer


I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

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Hey my omni wont start at the moment. we replaced the distributor cap and rotor and its not the map sensor what else could the problem be please help

If the car has current in the plugs and gas coming to the cylinders then it damn well start. Is the car being cranked? if yes, the battery is fine. Check the current in the plugs. The spark should be blue. The fuel pump working?
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My omni doesnt start all the time

It's common for the map sensor on the car to go bad and will cause the problem that your describing. Locate the MAP sensor and disconnect it and see if it starts, if it starts. Then replace the MAP sensor and most of the time it's going to be along the fire wall on your dodge. If there is an Auto Zone in your area, they can do a part locate for your car and show you where it is so you can check for any damaged vacuum tubes to the MAP sensor from the intake manifold, and at worst you may have to replace it and Auto Zone may have the parts on the shelf or they can order it in if it's bad. Auto Zone can also read the code you have to address the issues you car has. Good luck and hope this helps. 
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replace your MAP sensor(manifold absolute pressure) the map sensor is the computer for your fuel pressure regulator telling how much pressure. Unless your tahoe runs like **** going up hill than it inevitably your fuel pump
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Car hard to crank and stalling

Hi

Expensive part to fit, as a guess.!

Have an exhaust gas tested first, this will confirm that the cat converter is shot or not !

Sounds more like a sensor problem to me .

Good Luck !

A FixYa rating would be nice Please !

John.

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