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Au series 3 falcon 6 cylinder auto will not rev past 3000rpm. have replaced tps,coolant and knock sensors. have tried a different ecu as well. still will not rev past 3000rpm.in park or under load

Replaced tps, coolant. and knock sensors. cleaned all electrical terminals and earths. tried another ecu unit.

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Check for back pressure in exhaust before the convertor

Posted on Dec 11, 2014

Testimonial: "Exhaust is also new and cat convertor has not collapsed"

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96 3.1 rev limiter at 2900 -3000rpm. Went through vaccume sys. Comp.coil assy.egr. tps.cam and crank sensors test good. Correct fuel pressure running and not. Maf is responsive, anything im missing?


The rev limiter is built into the PCM. If the vehicle will not get past the RPMS you have indicated and all sensors test good, check for a plugged exhaust system. The catalytic converter could be restricted/plugged. You can remove the front 02 sensor ( which will allow the exhaust to breath somewhat better ) and see if the vehicle will come up in RPM. IF it does, suspect a plugged exhaust.

Jan 19, 2016 | Cars & Trucks

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TPS faults and how to fix


1.3b) TPS Throttle Position Sensor faultsSymptoms of faulty TPS:
Associated OBD2 error codes DTCs: P0121 - P0123

  • Poor starting: The engine may start and then stall immediately.The engine may be encouraged to keep running by slowly pressing the accelerator pedal: pressing too quickly may again stall the engine.
  • Erratic/fast idling: The idle may be so erratic as to have some impact on the automatic gear shift characteristics and may actually prevent gear shifts. The engine idle speed may be increased above normal if the TPS fails to report that the throttle is closed. After the engine has been run at high speed the engine may take longer than is usual to return to idle as the ECU will not be able determine how quickly to shorten the injector cycles.
  • Engine hesitancy/ jump in revs: Engine may fail to respond quickly to the accelerator pedal input or may suddenly jump in revs inappropriate to pedal movement. When working properly the TPS should instantaneously signal the rapidly opened throttle position to the ECU. The speed of this signal is much quicker than any similar signal sent from Manifold Air Pressure (MAP) sensor or MAF/IATequivalent. The ECU responds by increasing the fuel injection volumes to match the rapid increase in air volume. If the TPS fails to send the correct signals, the engine will seem to "hesitate" as the throttle is applied as the ECU looks to the other (slower) sensors to determine engine status. A sudden blip of the accelerator at idle can stall the engine (see above - poor start) as the ECU reacts too slowly to increase the injection time to match the sudden intake of air.
  • Engine Misfire: Spurious, beyond normal range, signals from the TPS causes the ECU to set inappropriate fuel injection cycles resulting in misfire.Detected misfire leads to a check engine light(CEL); mal-function indicator lamp (MIL). Cylinders with misfire events detected by the knock sensor may be shut down (disable specific injectors) by the ECU to prevent engine damage.

Note: - With the TPS disconnected the ECU depends on the slower signals it receives from the Mass Air Sensor (MAS) and/or the Manifold Air Pressure (MAP) sensor along with feedback from the oxygen sensor to help regulate engine speed and fuel injection cycle.

How to check? The socket for electrical connection with the TPS has 3 pins, one for 'ground', one for 5 volts 'reference' and a third (generally the middle one) for 'signal' output. Back probe the signal pin in the connector to the TPS. Attach the positive lead of a voltmeter to the probe and measure the voltage output as the throttle plate is rotated. If working correctly the meter should show a voltage consistent with the throttle position from approximately 1 volt when closed and 5 volts when fully open. What is looked for is smooth voltage increase with throttle change.If there are drop outs in the throttle transition voltage signal or if there is no transition then the TPS is faulty.

How to fix? If the track is dirty causing drop outs, try cleaning it with residue-free electrical cleaningspray. If the track is worn it is perhaps easiest toreplace the complete device. In some instances it may be possible to adjust the location of the central mount of the TPS contact arm along the throttle shaft by a few millimeters and in the process cause a fresh concentric region of track to be used

NEXT 1.4) Idle Air/speed control valve

on Jul 15, 2011 | Mercedes-Benz E-Class Cars & Trucks

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Revs go up to 3000rpm and down again


run the fault codes as what you have done may not be the problem at all

May 28, 2015 | Opel Cars & Trucks

1 Answer

High idle when air con On 3000rpm


The IAC valve is controlled by the ECU. The IAC or Idle Air control valve, adjusts depending on information that the ECU receives from several engine related sensors. You need to look at everything that you can. Inspect all wiring and connections, around the engine. Look for damaged vacuum lines and if you know how to, look for air leaks going into the head. If unmetered air gets into the engine, bypassing the TAC unit. Then the ECU will not be able to make correct adjustments. Also look at the coolant level, temp, and condition. The long and short of it is that the ECU oversees the engine speed. Depending on different parameters, turning on the A/C sends a signal to the ECU that the engine load has been increased. Depending on other information (whether it is correct or not) the engine speed is increased to maintain engine speed. I hope this information helps but if not please write back. Be as specific and detailed as you can and I'll do my best, good luck.

Mar 15, 2014 | Cars & Trucks

1 Answer

Mechanical help?


A loud knock is almost always a piston or bearing problem, or liquid in one of the cylinders that can not compress such as coolant.

Jan 17, 2013 | Cars & Trucks

1 Answer

I need a honda car code , i can't turn on my radio


service manual.
Code Description Possible Cause
0 ECU / ECU signal No signal to ECU
1 Oxygen sensor circuit Oxygen sensor or circuit, ECU
2 Oxygen sensor circuit Oxygen sensor or circuit, ECU
3 MAP sensor circuit Map sensor circuit
4 CKP sensor / engine speed (RPM) Crank angle sensor or circuit, ECU
sensor
5 MAP sensor circuit MAP sensor or circuit, mechanical
problem
6 ECT sensor circuit ECT sensor or circuit, automatic
transaxle control unit
7 TPS / Angle Sensor TPS sensor or circuit, automatic
transaxle control unit
8 CKP sensor / engine speed (RPM) Crank angle sensor or circuit, ECU
sensor
9 CMP sensor CMP sensor or circuit
10 IAT sensor IAT sensor or circuit
11 Idle Mixture Adjuster Sensor Idle mixture adjuster sensor or
circuit
12 EGR system fault No EGR action, faulty EGR valve
13 BARO sensor circuit BARO sensor or circuit
14 Idle Air Control valve circuit / ECU Open or shorted out ignition signal
circuit / No signal to ECU
15 Ignition Output signal Open or shorted ignition output
signal circuit
16 Fuel Injector Circuit Open or shorted fuel injector
circuit
17 VSS circuit VSS sensor or circuit
18 Ignition Timing Adjuster Open or shorted signal circuit
19 A/T Lock-up control solenoid Open or shorted signal circuit,
Lock-up control solenoid lock-up solenoid
20 Electrical Load Detector / Sensor Electrical load detector or circuit
Honda/Acura
Fault Code Definitions (21 - 59)
Chapter 3 22
Code Description Possible Cause
21 Spool Solenoid Valve Open or shorted signal circuit,
spool solenoid valve
22 Valve Timing Electronic Oil Open or shorted signal circuit,
pressure switch valve timing oil pressure switch
23 Knock sensor circuit Knock sensor or circuit
30 AT / ECU communication signal A AT control unit, ECU
31 AT / ECU communication signal B AT control unit, ECU
35 Traction control / ECU / signal Traction control module, ECU
36 Traction control / ECU / signal Traction control module, ECU
41 Oxygen sensor heater - left side Oxygen sensor / heater or circuit
42 Oxygen sensor heater - right side Oxygen sensor / heater or circuit
43 Fuel Supply system - left side Oxygen sensor or circuit, fuel
system
44 Fuel Supply system - right side Oxygen sensor or circuit, fuel
system
45 Fuel metering - left side Injector control circuit, incorrect
fuel metering
46 Fuel metering - right side Injector control circuit, incorrect
fuel metering
48 Heated oxygen sensor Oxygen sensor or circuit
53 Right Knock Sensor Right knock sensor or circuit
54 CKP sensor 2 CKP sensor 2 or circuit
59 CMP sensor 2 CMP sensor 2 or circuit

Dec 28, 2010 | 1994 Honda Accord

1 Answer

1991 accord, auto trans: green sport light is flashing. WHY???


It is either your Vehicle Speed Sensor (easy to change) or your Automatic Transmission Computer (capacitors burn out on these boards, there is a fix for this too, the picture is at the bottom of this page). You need to diagnose by removing the lower right plastic kick panel on the passenger side. There you will find a blue plug. With the car OFF stick a paper clip, wire or stuff the plug with foil to make electrical connection so that the two terminals are touching. Then, turn the ignition to ON (not enough to start it though, just power it up). When you do this, count the blinks in the "S Light" or count your blinking Check Engine Light. Both are different but can refer to different things wrong with your car. A long blink is the first number and the short blinks that follow are the second number.
So imagine this as being 14 : ___ _ _ _ _

Below is a decoding chart:

The first section will be the check engine light codes2_bing.gif, the next one is the Transmission Control Unit Codes read from the S Light;

1 O2A - Oxygen sensor #1
2 O2B - Oxygen sensor #2
3 MAP - manifold absolute pressure sensor
4 CKP - crank position sensor
5 MAP - manifold absolute pressure sensor
6 ECT - water temperature sensor
7 TPS - throttle position sensor
8 TDC - top dead centre sensor
9 CYP - cylinder sensor
10 IAT - intake air temperature sensor
12 EGR - exhaust gas recirculation lift valve
13 BARO - atmospheric pressure sensor
14 IAC (EACV) - idle air control valve
15 Ignition output signal
16 Fuel injectors
17 VSS - speed sensor
19 Automatic transmission lockup control valve
20 Electrical load detector
21 VTEC spool solenoid valve
22 VTEC pressure valve
23 Knock sensor
30 Automatic transmission A signal
31 Automatic transmission B signal
36 traction control found on JDM ecu's
41 Primary oxygen sensor heater
43 Fuel supply system
45 Fuel system too rich or lean
48 LAF - lean air fuel sensor
54 CKF - crank fluctuation sensor
58 TDC sensor #2
61 Primary oxygen sensor
63 Secondary oxygen sensor
65 Secondary oxygen sensor heater
71 random misfire cylinder 1
72 random misfire cylinder 2
73 random misfire cylinder 3
74 random misfire cylinder 4
80 Exhaust Gas Recirculation insufficient flow detected
86 ECT Sensor (Engine Coolant Temperature) circuit range / performance problem
90 Evaporative Emission Control System leak detected in the fuel tank area
91 Fuel Tank Pressure Sensor low input
92 Evaporative Emission Control System insufficient purge flow

TCU Codes:

CODE LIST:

1-Lock-up solenoid 'A' circuit open or shorted.
2-Lock-up solenoid 'B' circuit open or shorted.
3-Throttle Position Sensor circuit open or shorted.
4-Vehicle Speed Sensor open or shorted - No signal from speedometer.
5-Shift Lever Position Switch circuit shorted.
6-Shift Lever Position Switch circuit open.
7-Shift Solenoid 'A' circuit open or shorted.
8-Shift Solenoid 'B' circuit open or shorted.
9-Counter shaft or transmission speed pulse generator open or shorted.
10-Coolant Temperature Sensor open or shorted.
11-Engine RPM (Ignition coil signal) open or shorted.
12-(No code 12 used)
13-Main shaft speed pulse generator open or shorted.
14-Linear (line pressure control) solenoid open or shorted.
15-Kick down switch circuit shorted.
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Feb 14, 2010 | 1991 Honda Accord

1 Answer

Check engine light tells me knock sensor or circut ecu


On a 6 cylinder, the knock sensor is located under the intake manifold, on the inside edge of the cylinder block. You must remove the entire intake manifold assembly to access the knock sensor. If you are replacing it, it would be very advisable to replace the sensor AND the extension wire from it to the main harness. I have observed that the wire extensions become brittle over time, and they fail with regularity.

Dec 07, 2008 | 1991 Toyota Pickup

1 Answer

4 cylinder motor


http://www.analogstereo.com/pdf/om/hyundai_tiburon_owners_manual_2003.pdf
note_icon.gif Mark all wiring and hoses to avoid misconnection. Inspection the timing belt before removing the cylinder head. Turn the crankshaft pulley so that the No. 1 piston is at top dead center
1. Disconnect the neagative terminal from the battery 2. Remove the engine cover. . Drain the engine coolant. Remove the radiator cap to speed draining. 4. Remove the intake air hose and air cleaner assembly. (1) Disconnect the AFS connector. (2) Disconnect the breather hose from air cleaner hose. (3) Remove the intake air hose and air cleaner. 5. Remove the upper radiator hose (A) and lower radiator hose (B). 6. Remove the heater hoses 7. Remove the engine wire harness connectors and wire harness clamps from the cylinder head and the intake manifold. (1) OCV(Oil Control Valve) connector (A). (2) Oil temperature sensor connector (B). (3) ECT (Engine Coolant Temperature) sensor (C) connector. (4) Ignition coil connector (D). (5) TPS (Throttle Position Sensor) connector (A). (6) ISA (Idle Speed Actuator) connector (B). (7) CMP (Camshaft Position Sensor) connector (A). (8) Four fuel injector connectors (B). (9) Knock sensor connector (C).

May 27, 2008 | 2003 Hyundai Tiburon

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