Does not rev past 3,000 RPM's and bogs down

Hi,

It could be related to fuel pressure. Is the check engine light staying on when the engine is running? If it is, have you scanned the computer for codes?

If you haven't, that is where I would start. Here is a quick video showing how that is done:

https://youtu.be/b2IJGfImVvw

Most parts stores will do that for free, so if you haven't done it already, do it. Let me know what codes are found.

If you have done that, here is a link that shows in general how to check fuel pressure:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Here are the directions specific to your vehicle. This is for a single overhead cam engine. If you have the dual overhead cam engine, let me know.

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1995 Dodge Neon L4-2.0L SOHC
Fuel Pressure Test
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Pump Fuel Pressure Testing and Inspection Component Tests and General Diagnostics Fuel Pressure Test
FUEL PRESSURE TEST
Fig. 18 Fuel Pressure Test Port

Pic 1

NOTE: The fuel system operates at approximately 331 kPa (48 psi). Check fuel system pressure at the test port on the fuel rail (Fig. 18).

1. Remove cap from fuel pressure test port on fuel rail.

Fig. 19 Checking Fuel Pressure At Intake Manifold

Pic 2

2. Connect Fuel Pressure Gauge C-4799B to test port (Fig. 19).

CAUTION: When using the ASD Fuel System Test, the ASD relay and fuel pump relay remain energized for 7 minutes or until the test is stopped, or until the ignition switch is turned to the Off position.

3. Place the ignition key in the ON position. Using the DRB or equivalent scan tool, access ASD Fuel System Test. The ASD Fuel System Test will activate the fuel pump and pressurize the system.
- If the gauge reading equals 331 kPa (48 PSI) further testing is not required. If pressure is not correct, record the pressure.
- If pressure is above specifications, check for a kinked or restricted fuel return tube (from filter to pump module). If the fuel return tube is not pinched or restricted, replace the fuel pressure regulator.

NOTE: If fuel pressure is below specifications, refer to the diagnosis chart below for Fuel Pressure Below Specifications.

Fuel Pressure Below Specifications

Pic 3

To answer your first question, it could be pressure, a sensor, a vacuum leak, and so on. By scanning the computer and checking fuel pressure, it will help us pinpoint where the problem is coming from.

Let me know if this helps or if you have other questions.

Take care,
Joe

Hi,

As far as the TPS, it shouldn't get hot. Here is how to check it:

The Throttle Position Sensor (TPS) can be tested with a digital voltmeter.
- The center terminal of the sensor is the output terminal.

With the ignition switch in the ON position, monitor the output voltage at the center terminal wire of the connector -- while slowly moving the throttle from the idle position to Wide Open Throttle (WOT).
- At idle, TPS output voltage should be approximately 0.5 volts.
- At wide open throttle, TPS output voltage should be approximately 3.7 volts.
- The output voltage should gradually increase as the throttle plate moves slowly from idle to WOT.

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As far as the MAP, here are the directions. The attached pic correlates with the directions.

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1995 Dodge Neon L4-2.0L SOHC
Component Testing
Vehicle Powertrain Management Sensors and Switches - Powertrain Management Sensors and Switches - Computers and Control Systems Manifold Pressure/Vacuum Sensor Testing and Inspection Component Tests and General Diagnostics Component Testing
COMPONENT TESTING
Fig. 30 MAP Sensor Connector

Pic 1

NOTE: Complete testing of this component and its circuit is done at the system level. See: A L L Diagnostic Trouble Codes ( DTC ) > Manufacturer Code Charts > DTC Test - CODE TO TC TEST CHART (Checking for Trouble Codes)

CAUTION: When testing the MAP sensor, be sure that the harness wires are not damaged by the test meter probes.

1. Test the MAP sensor output voltage at the MAP sensor connector between terminals 1 and 3 (Fig. 30).
- With the ignition switch ON and the engine not running, output voltage should be 4 to 5 volts.
- The voltage should drop to 1.5 to 2.1 volts with a hot, neutral idle speed condition.
- If OK, go to next step.
- If not OK, go to step 3.

2. Test PCM terminal 29 for the same voltage described in the previous step to verify wire harness condition.
- Repair as required.
3. Test the MAP sensor ground circuit at sensor connector terminal 1 and PCM terminal 51.
- If OK, go to next step.
- If not OK, repair as required.
4. Test MAP sensor supply voltage between sensor connector terminals 2 and 1 with the key ON. The voltage should be approximately 5 volts (+/- 0.5V). Five volts (+/-0.5V) should also be at terminal 43 of the PCM.
- If OK, replace MAP sensor.
- If not OK, repair or replace the wire harness as required.

NOTE: Complete testing for this system or component can be found at the system level. See: A L L Diagnostic Trouble Codes ( DTC ) > Manufacturer Code Charts > DTC Test - CODE TO TC TEST CHART (Checking for Trouble Codes)

Hi,

Have you had the chance to check the sensors? Also, I wonder if there is an issue with a plugged catalytic converter. Do me a favor. Take a look through this link and let me know if it mirrors what you experience.

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

Here is a link that explains how to check the catalytic converter:

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

If you can, try removing the o2 sensor before the catalytic converter to see if that makes a difference. If the catalytic converter is plugged, this won't make it perfect, but you will notice a difference.

Let me know. Also, let me know if you checked the aforementioned sensors.

Joe