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7 votes
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Soldering wires in a wiring harness

Soldering wires in a particularly old harness will actually reduce resistance in that portion of the wire. It won't be noticeable except for allowing for greater signal/line integrity. I.e. In a wire ...
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5 votes
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Engine stumbles upon restart after a few hours of inactivity

The symptom is explained by low pressure in the fuel rail. If this was happening only during hot starts I would investigate the following, since in fuel-injected systems, hot-start problems indicate ...
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5 votes
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Is it safe to drive with broken wheel lug nut.?

It should not be an issue driving with one lug missing, as long as the other lug nuts are torqued as they are supposed to be. 4km is not a long distance, and especially one you shouldn't be worried ...
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5 votes
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Oil burning: differenciate between bad valve seals or piston rings

You can perform a Leak Down Test to pinpoint what's going wrong. You'll obviously need a leakdown tester kit, you'll need an air compressor, and some hand tools. Pull out spark plugs and either by ...
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  • 1,576
5 votes
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Engine burning oil

3 places where oil gets into the combustion chamber PCV system- you ruled this out Piston rings- engine rebuild time Valve stem seals- these can be replaced without cylinder head removal Thicker oil ...
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  • 7,925
5 votes

Engine hesitates and stalls when warm

The stalling issues point toward problems with an engine control system (air, fuel, or spark), but again short of replacing the fuel pump, you have already replaced the parts most likely to cause ...
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  • 6,017
4 votes
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Possible Fuel pump damage

The black powder was charcoal from the evaporative fuel filter/canister. This filters evaporated fuel from your fuel tank. When your fuel tank gets warmer and the gasses expand above the fuel line ...
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  • 32.7k
3 votes

Car Bank1 O2 Sensor Query

I'm thinking it looks fine. It looks as though the vehicle is in "Open Loop" during the first little bit, then goes into "Closed Loop" when you see all the activity. During Open ...
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3 votes
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Car jerks when stopped in traffic

It turned out to be a result of disconnecting the battery from the vehicle. When the battery is disconnected, the ECU forgets what it has self learned about when to switch gears, how much to open the ...
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  • 981
3 votes
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Engine revs without much acceleration

Could the wiring harness problem have a relation to the acceleration problem? Possibly, if it is an electronic transmission Is it possible to check transmission fluid level in my car? Not ...
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  • 7,925
3 votes
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Rough idle when AC is on

The symptoms are consistent with deposits in the throttle body. There are other potential causes. These deposits accrue in the intake manifold over time. They build faster with short trips and low ...
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  • 11.5k
2 votes
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CVT transmission slipping

The mechanic disassembled the gearbox and there was a minor damage in a piston which controls CVT pulleys. When the piston was replaced, the problem got resolved.
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  • 981
2 votes

Soldering wires in a wiring harness

A word of caution: soldering creates a stiff section in an otherwise flexible wire. If the wire flexes, the soldered/un-soldered transition is a stress point, where the wire can break. This is one ...
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  • 865
1 vote

Toyota Vitz rough idle

Let's assume you have already checked for small vacuum leaks in the rubber tubing on the intake manifold and replaced the PCV valve (if applicable) . . . I had the same problem on three different cars ...
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  • 1,489
1 vote
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Tire-pressure on Toyota Vitz 2012

This is the same car that was sold as Toyota Yaris in Finland. I used to have a 2011 model of that car, with the same 1NR-FE engine. The tires were, if I recall correctly, 185/60R15. According to ...
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  • 13.3k
1 vote

Toyota Vitz 2007: Can a vacuum leak lead to PO171

Basically the ECM expects X amount of volume to enter the intake at X RPM. MAF or no MAF. At idle if there's more volume than calibrated for, the AFR/O2 sensor will see a lean condition and the ECM ...
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  • 10.7k
1 vote

PO171 trouble code at idle

Here's another possible cause, that I discovered while preparing to clean the Mass Air Flow (MAF) sensor using MAF cleaner spray; big as day, saw a big crack in the hose from the MAF body to the ...
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1 vote

PO171 trouble code at idle

If the throttle body, MAF/MAP was cleaned, or other fuel/emission components replaced, the throttle relearn needs to be done. Disconnect the negative cable from the battery (cover the post with a ...
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  • 9,035
1 vote

Oil burning: differenciate between bad valve seals or piston rings

A compression test will show whether its the seals or the rings. Make sure the engine is warm and perform a compression test (dry) and take a note of the readings. Then pour a couple of teaspoons of ...
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  • 576
1 vote

Sharp whining noise coming from rear of the car

Classic fuel pump issue. Replace it. What's most likely to have happened is one or two of the little vanes in the pump has snapped off on a piece of rust/dirt. This makes that whine, particularly ...
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  • 551

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