Prius (2004-09) :: Engine Speed Higher Than Before Mainly On Cold Start Or Go Uphill
Apr 9, 2014
I found recently that my 04' Prius' engine easily goes higher rev than before (based on engine sound pitch). It happens mainly when cold start, go up hill. After warmed up and on flat road, it goes back to normal. Overall, still in great condition at 211K. MPG stays at 46 on meter when temp is around 45F with 50% highway drive at 100 miles/day. I suspect the serpentine belt slippery or something. What do you think? I think the belt is original. I bought it used at 104K.
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The road my house is on is a steep hill. In the morning when I first start the car I have two choices. I can jump right on the hill and start climbing. Or I can drive down the hill and do a little quarter mile loop before I start climbing the steep hill. Which approach is best? Or is there a better way to handle this?
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I recently took my car to the dealer as it is under warranty, 25000 miles on it... (I used to be a Toyota tech a while ago)
after a cold soak, the gas engine starts, but its very shaky, almost like a miss-fire. And at about 10-20mph when you go to accelerate lightly, to make the gas engine start, it starts vibrating again. but if you give it more gas, it smoothens out. Still sounds like a misfire to me...
But, there are no codes.
The dealer replaced all 4 injectors, performed a throttle body service, and an EFI Service, includes, fuel system cleaning, tank additive.
they told me the injectors for #1 and # 2 where not performing correctly and that they needed to be replaced. after opening a case with the infamous TAS (Toyota tech support)..
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After a cold soak, the gas engine starts, but its very shaky, almost like a miss-fire. And at about 10-20mph when you go to accelerate lightly, to make the gas engine start, it starts vibrating again. but if you give it more gas, it smooths out. Still sounds like a misfire to me...
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When I am driving at a higher speed and I need to pass someone or accelerate, the engine bogs down. I push the peddle to the floor and nothing. This does not happen all the time but it happens. But when I accelerate from a light or lower speeds there does not seem to be an issue. I recently had the value gaskets replaced because of a small oil leak and it seems this problem began after then. I have taken it back to the shop but the problem does not duplicate itself when they test drive it.
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2000 Crown Victoria, 207K miles, 111K on current engine
My car has been an absolute champ since I took ownership of her at 133K miles, and to this day runs trouble-free. However, it's just started making a noise that's got my scratching my head. I can only describe it as a "puff" sound. It's consistent with engine speed (higher RPM = faster puffs), and seems to get louder the more open the throttle is. If you let off the gas and coast, the noise goes away.
What's kinda confusing me is that the noise does not occur at all while the car is not in gear. If you park and rev the engine, the noise doesn't happen at all. All fluid levels and conditions are good, and there's been no loss of power or other issues from the engine or transmission.
My only guess is perhaps I have a teeny-tiny pinhole leak in my exhaust somewhere. The sound seems to be coming from somewhere very close to the engine, but since it doesn't happen when parked I can't pop the hood and look around for where exactly the sound might be coming from.
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My truck decided to have some issues last weekend coming home from a friends house. After being on the road for about an hour the truck shuddered, lost speed and was incredibly sluggish trying to get up the hill. It flashed the CEL and then went out. I was doing about 75 with the cruise on.
After slowing down to about 60 it stopped the shuddering and resumed operations as normal. Until about 20 minutes later when it repeated the above.
The next day I grabbed my reader and found the P0302 and P0306 codes. I cleared the codes and took it for a "test" drive up and down the mountain to see if it would trip the codes again. It didn't flip the codes. I thought I might have been dealing with a "one off" issue and left it alone for a few days.
Two days ago the CEL light came on and stayed on this time. Sure enough P0306. Cylinder 2 did not throw a code this time. After doing some research on here I ordered two new COPs and bought a mechanics stethoscope and some new spark plugs just in case.
The stethoscope confirms that cylinder 6 is having some issues. The COPs came in today so I'll take it apart tomorrow and see what I see. I'll be looking at both the COPs and the plugs to see what may be causing the problem. The "nice" thing about this is that at least it's one of the easier COPs to get to.
Should be a nice day for working on the truck.
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I've been feeling more and more, a vibration in the RX400 AWD. Just to be certain, I had the tires rotated and balanced....still there. My conclusion is a wheel bearing.
What I notice, from 60 up to 80 MPH (speed limit in WY & MT), a slight vibration in the car. I can't pinpoint if it's front or rear, but there is certainly one occurring.
So, is there anything else that could contribute to this or is it usually a wheel bearing going bad? I just drove 1200 miles over the holiday and didn't notice much of a change. Still vibration. Not so strong that my wife has noticed, but enough that I'm feeling it.
I assume it's just a complete assembly and can be changed out relatively easily. I've done my 4wd suburban so I'm guessing similar in work.
How to test which assembly is going bad? Front/Back....Left/Right?
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Problems overheating. Have replaced thermostat and the housing for it...fan clutch and water pump. Its still overheating especially going uphill when RPM's are higher. How can I check to see if there is a radiator blockage?
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'15 Persona, should I keep the tire pressure higher during winter? I normally keep it at 33 front 32 rear, like the sticker on the door shows.
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My Subaru want to stall when it shifts from a higher to a lower gear when driving up a grade/hill. Also does the same thing when pulling out from a stop sign or traffic light. You need to pump the accelerator to get it going.
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is locking in 4m but is too high, suppose to be ~2200rpm.When I checked with vagcom the speed shown on computer show a speed with 20km/h higher than the real speed (shown at speedometer)
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Experiencing engine hesitation after a cold start? I've have noticed this and after the engine is warm there is no hesitation.
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Prius c miss and tick after a cold start. About a week ago I started my c the electric motor engaged and when the ice started up for warmup the engine jogged back and forth repeatedly and ticked quiet loud. There was also a noise sounding like a fan hitting something. I turned off the engine started it back up and nothing was wrong.Took it to the dealer and of course they couldn't find anything.
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"Vehicle with smart key system: The indicator light flashes after the "POWER" switch has been turned OFF to indicate that the system is operating." I have noticed that my immobilizer light will not blink when it has the no start issue. usually when the key is out the light blinks but when it won't blink.... it won't start.
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2007 Prius with ~133k miles:
We bought it used a little over a year ago and haven't any problems with it at all until now. Last night from a cold start, the check engine light came on along with the red triangle of doom. Checked the oil, it's fine, just had it changed a few weeks ago. Did the battery test, it's fine, 12.2v during the test and 14v with a load. Popped the hood, and I can see little waves in the pink inverter fluid when the car is in Ready. A drive around the block revealed that it's not running well at all... It could barely make it up a small hill.
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I have noticed that recently my engine seems to be coming on when I accelerate from a stand still even with very slow acceleration.
For example today: battery over 50%, foot off break and onto gas very gentally, 0 to 10 in about 4 seconds at about 8 mph I feel the engine kick in.
Over the last few days it has seemed like the engine has been running a lot in town or when moving slowly in heavy traffic.
If I press the ev button I can accelerate quiete aggressively before the engine will start.
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Sometimes I will stop at a light and my idling rpm will go from 600 (usual rate she idles at) to about 950. While this may seem inconsequential in the grand scheme of things, it's noticeable enough that it seems like the car wants to go. It'll lead me to depress the brake more. You can also hear the higher pitch of the faster turning engine (it is a 50% increase in speed). This will happen at random times so I have not been able to pinpoint if it is caused by a particular driving style. ECM for this?
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My Prius is having a problem during cold start. When I bought it, the cold start was very energetic with a high rev tone then gradually regulate to a normal pace and petrol engine shuts down. But about 4 months I noticed the tone of the cold start has changed, it starts with a weak and low engine rev and delays to turn off the engine. Today it took about 10 mins to power off the engine. Got 2 months I changed my 12V battery (Bosch now), thought that these symptoms was to notify that battery is failing. But the problem is persistent despite I put new battery..
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My Lexus Rx350 (2007) having problem starting the car when the engine is cold or switch off more than 1-2 hours. I need to crank the car at least 2-3 times to get the engine run. Once the engine run, i have no problem restarting the car with a single crack.
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I've got a 2008 Prius which I bought used last summer. It works quite well except for one behavior: In cold weather, sometimes, the car either does not start at all, or starts without the dashboard gauges lighting up.
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