Tuesday, Oct 20, 2015 at 00:16
Terry, I'd suggest you need to have the injectors removed and cleaned and serviced.
The injectors have a little basket-style filter in each of them that needs to be replaced - and you can get a full injector service kit off eBay.
Injector service kit
The injectors themselves probably need cleaning as
well. You need to put 12V power with a switch to the injectors when they're out, then give them a squirt of Carburettor and Throttle Body Cleaner.
Then put an air hose blow nozzle to the top of the injector and hit the switch momentarily and repeatedly until you get a free flow of air through the injector when the switch is hit, and the injector is open.
Make sure you have firm electrical connections with no chance of sparks, C&
TBC is highly volatile.
You probably also need to
check if you're getting full throttle plate opening when the accelerator is fully depressed.
Get someone to press the pedal to the floor and
check that the throttle plate is wide open when the pedal is on the floor.
If it's not, look under the dash where the throttle cable is attached to the top of the accelerator pedal, and in the bracket there should be a rubber bushing that keeps full tension on the throttle cable.
This rubber bushing will degrade and collapse with age and reduce the tension on the throttle cable - and as a result, the cable will not open the throttle fully. It will need replacing, if this is the case with your vehicle.
The 3.0L 3VZE V6 engine in the 4Runner never has been a powerful engine, they have always been a bit of a slug.
Around 300,000kms of engine wear, isn't helping any.
You could also do a compression
test to determine if compression is low on any of the cylinders - in which case, the valves probably need a grind as
well.
Is the oil consumption still modest? It should be no more than a litre of oil every couple of thousand kms.
You can
check whether any compression loss is either ring-related or valve-related, by doing an initial compression
test - writing down the figures - then squirting a teaspoon of light-grade oil into each cylinder, and re-checking the compression.
If the next compression results show a decent improvement in compression pressures, then the rings are seriously worn.
If there's little difference in compression results, the valves are no longer seating properly.
Cheers, Ron.
AnswerID:
591754