Question about 2008 Toyota 4Runner
I recently bought this truck and the check engine light came on but truck seems to be running fine except loss of power up steep hills. I had it scanned and was told to replace the o2 sensor. I did this with a universal but the light came back on. I then replaced it with an OE sensor, but light came back on. I had it scanned again and this time was told there were no codes but my hydrocarbon numbers at idle were very high, going from 400-1200 but they would drop to normal when engine was revved up to higher rpms. Everything else was fine besides that, the o2 sensor and catalytic conv. Iwere working fine. I took it to a mechanic who scanned it and said there was a code for too lean coming up and tested it for a vacuum leak and told me there wasn't one but he said that he adjusted my idle and timing, turned off the light and told me I would be fine. It came back on after about 20 miles of driving. I then took it to another mechanic who told me I also didn't have a vacuum leak and it wasn't misfiring, but the person who owned the truck before me didn't use the right Toyota plug wires when they did a tune up and that if I put the Toyota OE wires on it will clear up the problem. I have already spend over $250 on incorrect diagnoses and don't mind paying the $110 to buy them if it clears up the problem but I am hesitant after already shelling out this much on guesses. Has anyone heard of this causing this problem or any other suggestions for the problem. Thank you for your help
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Posted on Jan 02, 2017
When the timing chains stretch( and they do!) they can cause the 22re to stumble intermittently. Have trouble starting, misfiring, and even some trouble codes But first check your engine for codes You can do this by jumping TE1 and E1
If you have codes we can go from there.
You should pull your valve cover and check you timing chain tension, it should be very tight and not loose. if it is loose it is most likely time for a new chain and/ or tension and guides. I always replace them as a kit. Keep in mind that if the chain is worn it will get progressively worse until the engine will not run or the chain will wear in to the water galleys behind the water pump on the timing chain cover. sorry man.
Posted on May 04, 2009
SOURCE: Code 25 for Toyota 3.0 3VZE
code 25 air fuel ratio lean condition indicated.POSSIBLE CAUSES- AIR LEAKS IN THE INTAKE MANIFOLD -EXHAUST MANIFOLD -EXHAUST PIPES- FUEL CONTROL SENSORS IS OUT OF CALIBRATION LIKE THE-ECT IAT MAF -LOW FUEL PRESSURE LIKE- FUEL FILTER CLOGGED PRESSURE REGULATOR FAILURE- ONE OR MORE FUEL INJECTORS RESTRICTED -HO2S ELEMENT IS CONTAMINATED DETERIORATED OR HAS FAILED -VACUUM HOSE IS DISCONNECTED BROKEN LEAKING OR LOOSE.
Posted on Jul 20, 2009
Check your switches for the VSC, some get bumped on (due to their location) and some get stuck in the "on"position.
Posted on Aug 04, 2009
first thing to do is change the air filter. even if it appears clean, the airflow can be blocked enough to affect the petrol air ratios in the engine which will give high HC readings.
changing the spark plugs can give a cleaner spark, and better ignition, with lower HCs. high HCs could also be caused by traces of oil getting through worn piston rings and valve stem seals and burning in the combustion chamber. there are many oil additives that can help stop this and reduce HC levels as well.
hope these suggestions help
Posted on Aug 28, 2011
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