toeheadskater
New member
Sounds like an exhaust issue. Too much back pressure
v6 3.4 wont rev above 3k
- Thread starter robbie
- Start date
4RunninOverYou
New member
Could be a bad knock sensor. If its the knock sensor the ecu throws ur 4r into a "lean mode" it happened to me when I changed my valve cover gaskets I unplugged the wire that goes to the knock sensor and that's what it was doing.
Thanks guys for trying to help. The Toyota stearlership cant read the fault codes as here in the UK its an import. But they went through everything and could not find the solution apart from a dodgy ECU.
Whats strange is when i had the original problem 2 years ago i fixed it by playing with the crossover pipe heatshield and all was well.But since i pulled the bottom half off and all the fire resistant material fell out its dropped to 2.2k revs.
Hopefully i will be getting some exhaust wrap through the mail tomorrow and i will remove the other heatshield then wrap the crossover pipe tight with stainless steel ties. I cant believe it will make a difference but will let you know.
Whats strange is when i had the original problem 2 years ago i fixed it by playing with the crossover pipe heatshield and all was well.But since i pulled the bottom half off and all the fire resistant material fell out its dropped to 2.2k revs.
Hopefully i will be getting some exhaust wrap through the mail tomorrow and i will remove the other heatshield then wrap the crossover pipe tight with stainless steel ties. I cant believe it will make a difference but will let you know.
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GX4SEVEND
New member
I'm going this route also. When we changed my timing belt it ended up being 4 teeth off and I was getting codes and it wouldn't go past 3K. Not saying they messed with the timing belt but I'd check that and the cps as stated in the quote.
That was lucky the belt did not slip completely off and destroy the engine(EDIT non interferance engine my bad). My situation got better after playing with the exhaust then worse, then better and then worse again thats why i dont think its anything to do with the crank plus the dealership checked that out to be ok.
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Ok i exhaust wrapped the crossover pipe as part of the heatshield was missing and the revs have increased by 500rpm.
I know that higher exhaust temps mean lower gas density which = faster exit of gases. But does the 3rd gen v6's detect exhaust temperatures?
I am totally baffled as it looks like i am the only owner in the world to have this issue.
I know that higher exhaust temps mean lower gas density which = faster exit of gases. But does the 3rd gen v6's detect exhaust temperatures?
I am totally baffled as it looks like i am the only owner in the world to have this issue.
My 2000 t4r is running the same way just out of the blue when rpms hit 3000 its just like a rev limiter kicks in havent had time to check over every thing but no lights on.
Ive pulled the exhaust off the manifold, Things i have done.
No miss or check engine light
Checked timing
mass air sensor
TP sensor.
Checked all hoses for leaks none found.
plugs wires coil packs
check fuel pressure 55 psi at all times
pulled fuel line off installed EFI can to system eliminates fuel pump and filter
also cleans injectors
disconnected O2 sensors
crank sensor, cam sensors
checked compression 140 psi on all 6 cylinders
checked leak down of valves with leak down tester with in range.
Eliminated drive belts just for the hell of it so the crank is the only pulley that's turning.
Under load passing gear will not go over 3500 RPM at idle just sitting in park or neutral same thing. It has nothing to do with Rev limiter because its in park or neutral. Toyota's don't have a safety Rev limiter at idle so I know for a fact its not that. Not sure what else to try no body gets back on here and tells anyone after they find out what the problem is.
So if anyone has something else to try please let me know and if I figure it out ill let you guys know what the problem is. Thank you. :yield:
No miss or check engine light
Checked timing
mass air sensor
TP sensor.
Checked all hoses for leaks none found.
plugs wires coil packs
check fuel pressure 55 psi at all times
pulled fuel line off installed EFI can to system eliminates fuel pump and filter
also cleans injectors
disconnected O2 sensors
crank sensor, cam sensors
checked compression 140 psi on all 6 cylinders
checked leak down of valves with leak down tester with in range.
Eliminated drive belts just for the hell of it so the crank is the only pulley that's turning.
Under load passing gear will not go over 3500 RPM at idle just sitting in park or neutral same thing. It has nothing to do with Rev limiter because its in park or neutral. Toyota's don't have a safety Rev limiter at idle so I know for a fact its not that. Not sure what else to try no body gets back on here and tells anyone after they find out what the problem is.
So if anyone has something else to try please let me know and if I figure it out ill let you guys know what the problem is. Thank you. :yield:
I've owned a 3rd gen for six years and not once have I seen it rev past 3k rpms, with or without ECT. I always assumed it was due to the fact that the v6 is a low revving engine. It never occurred to me that something might be wrong, I just figured it was a slow truck. I also live in the low country with no hills so maybe that has something to do with it.
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SpidermanGeek
New member
This might sound dumb...but... did you check your throttle & kickdown cables?
SpidermanGeek
New member
Something must be wrong. It should be able to hit Redline.
For what it's worth, I rarely ever see the truck get up over 3k, reason being, it's not really geared that way, and it's only a 4 speed transmission (auto), one thing I noticed early, is at highway speeds it really only kicks down to 4th gear, and so, unless I'm moving at an obscene rate of speed, I never see high revs.
Only time it will ever see redline is if I floor it from a stop. I think the problem in this thread was different.
Once its hits 3500 RPM no matter driving or from park it bucks bad just like a misfire but no codes or cylinder misfire. When driving passing gear loses all power
its still running but won't go until i let off the pedal. Idle Reving will not go over 3500 RPM. Like i said in my first message Toyota's do not have a safety Rev I should be able to hit the red but it doesn't its not safe but ur able to.
I'm just lost at this point.
It's a 2000 4Runner 3.4
its still running but won't go until i let off the pedal. Idle Reving will not go over 3500 RPM. Like i said in my first message Toyota's do not have a safety Rev I should be able to hit the red but it doesn't its not safe but ur able to.
I'm just lost at this point.
It's a 2000 4Runner 3.4
