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Toyota land cruiser 1994. Codes 25 and 26. Rough idle and…

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Toyota land cruiser 1994....
Toyota land cruiser 1994. Codes 25 and 26. Rough idle and running.
Submitted: 2 years ago.Category: Toyota
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Customer reply replied 2 years ago
We replaced plugs today. The old plugs looked to be in good condition with one of them was somewhat darker brown on the insulator and the others were a light tan. Also, the plug that was somewhat darker had a spot of oil on the insulator. After installing new plugs the vehicle is running the same as it was with the old plugs.
Customer reply replied 2 years ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Customer reply replied 2 years ago
Do I need to wait for a response? Please advise.
Answered in 2 hours by:
1/31/2016
Toyota Mechanic: Matt, Mechanical Engineer replied 2 years ago
Matt
Matt, Mechanical Engineer
Category: Toyota
Satisfied Customers: 23,085
Experience: BEng, Repaired my own cars and others for 20 years, worked in Formula 1 for 10 years
Verified

Hello

This could be an airleak after the airflow meter, any air dragged in here isn't 'seen' by the ECU and so not compensated for and can lean the engine out and can also allow the engine to rev up when not desired causing rough running.

As its a mechanical fault it tends not to turn on the fault light and you can sometimes hear a 'hissing' noise with the engine running.

Check the hose clips for tightness and inspect the trunking for any cracks or splits and also all the vacuum system, the small bore pipes and fittings for cracks and missing parts.

The best way to locate a leak is to have the engine running and warm and then spray lighter gas /propane around each joint in turn. If the engine rev's up you've found your leak.

Now you might think that spraying lighter gas around a hot engine isn’t wise, however the flash /ignition point of gas is about 400°C so you need a naked flame or spark to set it off and I’ve used this method for many years without incident.

Work your way through each possible joint one at a time and you should find it. I use a slightly flattenedpiece of brake pipe and some rubber hose from the can of lighter gas to provide a spraying 'wand' and allow a direct blast of gas into each area, especially those difficult to reach with large implements.

It’s also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will all result in insufficient fuel being delivered to the engine

Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a quick fault find if you unplug the meter and run the engine without it.

if the engine condition is the same then chances are the meter or the connection to it is faulty

Air leaks are very temperature dependent as gaps can open or close up as things expand with heat, so the weather and engine temperature can effect them.

This leads them to be quite intermittent in the case of mild leaks

its also worth cleaning the airflow meter by removing it from the car and spraying the exposed sensor wires inside the tube with a brake or switch cleaner - ensure that the cleaner is one of the old fashioned, non Eco type that does not leave a residue

On no account touch the sensor wires with anything physical as they are extremely fragile

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Customer reply replied 2 years ago
Please note the fault light is on and I am getting codes 25 and 26.
Toyota Mechanic: Matt, Mechanical Engineer replied 2 years ago

Hello

both of the codes are issues with the air fuel ratio / fuelling

this is why I suggest to check for vacuum leaks

also

Check for exhaust leaks before the O2 sensor as if this has been experiencing an exhaust leak then it will have been running very rich as the sensor will see the extra air pulled in as fresh / lean fuelling and be adding fuel to compensate.

this can lead to catalyst failure as the extra fuel can re-light inside and melt the catalyst

The best way to find an exhaust leak is to run the engine from cold and feel around the exhaust joints with your bare hands - you'll have about 30 seconds before it all gets too hot and you should feel any escaping gas blowing over your fingers

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Toyota Mechanic: Matt, Mechanical Engineer replied 2 years ago

Hi

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Matt, Mechanical Engineer
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