Oct 202017

2005 Honda Accord

Car runs for half a mile, slows down to a halt. It still on but no matter how much gas I give it, it wont move. I turn it off for 5 minutes and then I turn it on and it runs but half mile later the cycle begins again…please help me

Going to need a little more information on this one.

  • Does the engine rev but the car does not move?
  • Engine does not rev when the gas pedal is pressed to the floor?
  • Does the engine sputter before it starts to slow to a halt?
  • Check engine light on?
Oct 202017

2000 Chevy Malibu

When it hasn’t been driven for a while and when its cold outside the turn signal stays on and wont flash. Once after quite a few miles and when the engine has warmed up the turn signals work properly and flash when they need to.

This Problem of the Turn Signals on your 2000 Malibu is Due to malfunction of the FLASHER RELAY
The Flasher Relay is Part of the HAZARD SWITCH. Located on the instrument cluster BEZEL.

Shop Automotive
The GM part Number is : 22594146

The Best Place for the Flasher Relay COST is aprox. $ 26.00

Source: Fixya.com

Oct 202017

Chevy Aveo

My air conditioning quit. The compressor spins, I checked Freon its fine. I put the gauges on it and it read 55psi low side, 100psi high side. Replaced expansion valve and recharged. Same thing.

This is an indication of a restriction in the system. Most likely the condenser is where the restriction is. You can flush the condenser and test for restriction or replace it.

Oct 192017

Honda Odessy

I have a 2006 Honda Odyssey EX-L. i-vtec VCM. It started running badly, very rough, would die in gear at idle. Had code P2647 VCM system stuck ON. I removed and clean the VTEC Spool Valve, EOP Switch and VTEC Solenoid. Reinstalled and cleared the code. The code did not come back but now I get misfires on all cylinders. I checked the timing belt to see if it slipped but it hadn’t. I replaced the timing belt while I was that far. Back together but still get pretty equal misfires on all cylinders.
I performed a leak down test on all cylinders. Cylinders 4, 5 &6 are all less than 10%. Cylinders 1, 2 &3 are at 80% loss on all cylinders. This is the head designed to shut down cylinders. There’s air through the exhaust and also air coming from the valve cover PCV connections.

It has been my experience in the past, that when our shop replaced just the switch it never repaired the vehicle but when we replaced the whole vtec assembly it would. This is especially true when there is any amount of sludge in the motor which is common on these engines.

I’m still a believer though that the valve assemblies themselves are sludging up causing the pressure switch to read incorrectly. Everyone that I’ve replaced has been sludged in the valve and the screen filter in the gasket.

Honda Code P2647 – Rocker Arm Oil Pressure Switch Circuit High Voltage

Code P2647 Possible causes
  • Check engine oil level, oil condition and pressure
  • Faulty Variable Valve Timing and Lift Electronic Control (VTEC) / Rocker Arm Oil Pressure Switch
  • VTEC/Rocker Arm Oil Pressure Switch harness is open or shorted
  • VTEC/Rocker Arm Oil Pressure Switch circuit poor electrical connection


Code P2647 Description

The VTEC system activates the rocker arm oil control solenoid (VTEC solenoid valve) by command from the engine control module (ECM)/powertrain control module (PCM), and it charges/discharges the hydraulic circuit of the VTEC mechanism that switches valve timing between Low and High. The ECM/PCM monitors oil pressure in the hydraulic circuit of the VTEC mechanism using the rocker arm oil pressure switch (VTEC oil pressure switch) downstream of the rocker arm oil control solenoid (VTEC solenoid valve). If there is a difference between the oil pressure condition in the hydraulic circuit that is determined by the ECM/PCM command and the oil pressure condition that is determined by the status of the rocker arm oil pressure switch (VTEC oil pressure switch), the system is considered faulty, and a DTC is stored.

Source: Team Leader Tech

Oct 182017

Buick Century

The wiring harness was cut in a wreck. I have connected all but three solid black and three solid grey wires. They are identical. Which do I connect to which? Or does it matter? They say they go to the throttle sensor and neutral switch. Please help!!

PCM Wiring Harness Issue

You will need to identify which wire is connected to each terminal coming from the PCM. You can do this with a multi-meter by checking the continuity from the pin connector at the PCM. Then using a wiring diagram correlate the PCM connector pin with each wire and this will let you know where the wire is supposed to go.

PCM Wiring Diagram (best viewed in Chrome or Firefox)

Oct 182017

Jeep Grand Cherokee

Lately my vehicle wants to stall and having a hard time staying in gear. I checked the trans fluid and there was no reading on the stick . I haven’t driven it since I filled it and I don’t notice any leaks.

Fluid Loss

Some leaks only happen under pressure. You may need to bring the engine to operating temperature and drive it. Then park it over a clean piece of card board and leave it set over night. This should determine if there is an external leak.

Another option may be an internal leak. Sometimes when the radiator busts internally the transmission fluid leaks into the cooling system. You may notice a discoloration of the engines coolant.

Oct 182017

Ford Ranger

Diagnosed a bad throttle position sensor. Installed a new one. Ran great for about a minute. Went back to running rough. Installed another new tps. Again it ran good for about a minute. Then it ran rough again. With the voltmeter I confirmed I had good 12 volt power going in. On the third wire I confirmed a good ground loop. But on the signal wire it should read 0.9 volts on closed throttle and 5.0 volts on wide open throttle. It gave 0.3 volts closed throttle to wide open throttle. Could my signal wire be grounded somewhere? Or could my computer be fried?

Throttle Position Sensor

tps connector diagram 2003 Ford Ranger

Testing for short or open in wiring harness

Check TP Circuit for open in harness
  • Turn ignition switch to off position. Leave TP sensor disconnected. Disconnect PCM connector(s). Inspect connector for loose, damaged or corroded terminals, and repair as needed.
  • Using a digital multi-meter, measure resistance of TP circuit between PCM harness connector and TP sensor connector.
  • If resistance is less than 5 ohms go to next step below. If resistance is 5 ohms or more, repair open in TP circuit.
Check TP Circuit for short to SIG RTN or PWR GND in harness
  • Ensure PCM is disconnected. Disconnect scan tool from Data Link Connector.
  • Using a Digital multi-meter, measure resistance between TP circuit, and SIG RTN and PWR GND circuits at PCM harness connector. If either resistance measurement is 10k/ohms or less, repair short between circuits.
  • If both resistance measurements are more than 10k/ohms, replace the PCM.



Oct 162017

Jeep Cherokee

Recently it started stalling out in traffic, but would start right back up no problem. Then stalls back out a few more miles down the road but again start right back up. The sensors check out fine, coil checks out fine, replaced the cam sensor that the on board computer says was bad. It is still stalling out but only in drive never at an idle. The only thing I can find wrong is only getting 9.4 volts to sensors the cam and the crank.

Generally when the computer sets a code for the cam position sensor it goes into default mode. This means it uses preset parameters to allow the engine to continue to run. The most common reason for the issue you have described would be a failing ignition control module. However the functions of the ignition control module are performed by the Electronic Control Unit (ECU), also known as the Powertrain Control Module. You stated that you already tried replacing it. My first thoughts would be if it was a reman unit from Autozone, you might want to take it back and try another one.

Next thought since you stated a lower than normal voltage reading that there might be an issue with the wiring harness. Maybe looking the harness over for any breaks or rubbing. Or even going more in-depth and performing a continuity test on each wire.

Camshaft Position Sensor Operation – 1993 Jeep Cherokee 4.0L

The Camshaft Position Sensor, or CMP sensor is located inside the distributor. The PCM uses the CMP signal to determine the position of the No. 1 cylinder piston during its power stroke. The PCM uses this information in conjunction with the crankshaft position sensor to determine spark timing among other things.

The CMP sensor contains a Hall effect device which sends either a 0.0 volt or a 5.0 volt signal to the PCM depending on the position of the distributor shaft.

If the cam signal is lost while the engine is running, the PCM will calculate spark timing based on the last CMP signal and the engine will continue to run. However, the engine will not run after it is shut off.

camshaft position sensor location diagram Jeep Cherokee

Hall-effect CMP Testing

1.Connect a scan tool to the data link connector (DLC) and check the CMP sensor datastream for a normal waveform.
2.If the scan tool waveform for the CMP sensor is not within the specified values perform a visual inspection on the CMP sensor, wiring harness, connector and related components as follows: ◦Ensure that the connector tabs are fully locked
◦Check for corroded terminals
◦Bent pins
◦Pins pulled back in the connector
◦Terminal cavities spread open
◦Harness damage
◦Sensor damage

3.If the connectors, wiring harness and related mechanical components pass inspection, perform the following procedures to test the CMP sensor, wiring and related modules: A.Disconnect the CMP sensor connector.
B.Check the CMP power input circuit by performing a circuit resistance test between the CMP sensor and the power input. Use the Component Pin Data for circuit details.
C.Check the MAF sensor signal circuit to the PCM by performing a circuit resistance test between the MAF sensor and the PCM. Use the Component Pin Data for circuit details.
D.Check the MAF sensor ground circuit between the MAF sensor and PCM by performing a circuit resistance test. Use the Component Pin Data for circuit details.
E.Repair/replace defective parts as needed and recheck the scan data.