honda crv 2004 引擎加速无力
版主： lexian
#44 Re: honda crv 2004 引擎加速无力
tps might not be that common to fail/as in defect, but quite common to fail/as slight inaccurate or lost calibration... actually my impression tps are super daily routine for yota engines esp. the proud 20v or jzs, diag/manual adjust/ecu calibrate... very soon ya got so proficient you could do tps jobs eyes closed, darn those precious little thingie...弃婴千枝 写了： 2024年 2月 24日 11:24 tps是个非常dull非常不容易坏的sensor
你不妨去问问随便一个shop，他们一年内一般换几个tps？十年内又换了几个tps？
我的估算是，基本上10年内换不超过1个tps
而且，发动机进气是通过map，maf，和air fuel ratio sensor来精确控制燃烧的，tps是用来诊断前面3个sensor异常用的，是secondary的
你妈，你们真以为现在还是化油器时代啊
Actually for most daily grocery getters, load source=air measuring, TPS doesn't relate to tuning maps at all, at least for my link g4x & haltech 1200 duty cycle formula, according to documentation load source = map/maf section... but still is super duper indicative driver's intention, like sly driver suddenly floored it from dead idle - then it'll retard timing for engine safety, while going full speed ahead. Pretty much telling driver's intention, whether now is idle, mild accelerate, dead ahead, fuel cut, anti-lag retard, lil bypass rotational idle, etc etc. And triggers action as such
Lol but there always been quirky engines, those precise ITBS rigs always better mapped completely off TPS, MAP/maf etc only serve as 4d/5d fuel map supplement. Again like yota 20v... or racing 503e etc.
( lol was wanna posting 'if MT retro cars check TPS, or maybe cam distro igniter n other efi sensor thingymajiks, and don't forget check comp as routine precaution', but 2000s+ cars beyond my league )
#46 Re: honda crv 2004 引擎加速无力
LOL.
You got be kidding me that honda vvti will affect TPS readings.
We are not talking about a BMW where the vanos motor can do arbitrary adjustments of valve lift. In that case, you do not even need a throttle body.
The BMWs do not have a throttle body to eliminate throttle loss.
The honda vvti has either 2 or 3 profiles on the intake side. Most likely the vvti on a CRV only has 2 profiles.
For throttle control, you need continuous adjustment from idle all the way to WOS. Not one profile for high speed one profile for low speed...
Also note that it is impossible to only rely on MAF to control fuel injection.
When the car just starts, the MAF won't have the correct reading as it needs to warm up to operating temperature.
Fuel injection is controlled only by throttle in an open loop operation. Only when the engine warms up, it switches over to close loop where the MAF and O2 sensor control fuel injection.
With MAF mal-function, the car will switch to open loop and that should set an engine code.
It is possible the engine does not have a MAF as it would have set a code if TPS reading is wrong. A wrong TPS reading should make MAF reading implausible and force the car into open loop and set a code.
You got be kidding me that honda vvti will affect TPS readings.
We are not talking about a BMW where the vanos motor can do arbitrary adjustments of valve lift. In that case, you do not even need a throttle body.
The BMWs do not have a throttle body to eliminate throttle loss.
The honda vvti has either 2 or 3 profiles on the intake side. Most likely the vvti on a CRV only has 2 profiles.
For throttle control, you need continuous adjustment from idle all the way to WOS. Not one profile for high speed one profile for low speed...
Also note that it is impossible to only rely on MAF to control fuel injection.
When the car just starts, the MAF won't have the correct reading as it needs to warm up to operating temperature.
Fuel injection is controlled only by throttle in an open loop operation. Only when the engine warms up, it switches over to close loop where the MAF and O2 sensor control fuel injection.
With MAF mal-function, the car will switch to open loop and that should set an engine code.
It is possible the engine does not have a MAF as it would have set a code if TPS reading is wrong. A wrong TPS reading should make MAF reading implausible and force the car into open loop and set a code.
上次由 seymour 在 2024年 2月 24日 23:57 修改。
#47 Re: honda crv 2004 引擎加速无力
Stretched timing chain should set a cam position sensor code. It is hard to believe it leads to major drivability issues before the cam position sensor informs the ECU that engine timing is off.
Honda engine is pretty simple and cheap. Even that, It is hard to imagine they do not monitor cam position carefully to ensure the timing is good by the ECU.
Honda engine is pretty simple and cheap. Even that, It is hard to imagine they do not monitor cam position carefully to ensure the timing is good by the ECU.
弃婴千枝 写了： 2024年 2月 24日 11:02 我跟你们说，这就是timing chain问题
你把valve cover拆掉，转动crankshaft对准crank pulley上的timing mark，你检查camshaft上的timing mark，特别是intake valve timing mark----即靠车头那个，就知道了
timing chain一般只拉长2-5mm，更换honda timing chain非常容易，成本150刀honda chain加10刀permatex黑胶，我现在得心应手，2个小时就够了
当年帮同学的垃圾accord修这个问题，你妈，啥sensor都换了，最后才想到chain，换了就好了，当时第一次换chain, 提心吊胆，生怕搞不定，还起了大早留了一整天时间，结果只用了3小时，还不到中午饭点，饭店还没开门
#48 Re: honda crv 2004 引擎加速无力
大师知识很多。seymour 写了： 2024年 2月 24日 20:36 LOL.
You got be kidding me that honda vvti will affect TPS readings.
We are not talking about a BMW where the vanos motor can do arbitrary adjustments of valve lift. In that case, you do not even need a throttle body.
The BMWs do not have a throttle body to eliminate throttle loss.
The honda vvti has either 2 or 3 profiles on the intake side. Most likely the vvti on a CRV only has 2 profiles.
For throttle control, you need continuous adjustment from idle all the way to WOS. Not one profile for high speed one profile for low speed...
Also note that it is impossible to only rely on MAF to control fuel injection.
When the car just starts, the MAF won't have the correct reading as it needs to warm up to operating temperature.
Fuel injection is controlled only by throttle in a close loop operation. Only when the engine warms up, it switches over to open loop where the MAF and O2 sensor control fuel injection.
With MAF mal-function, the car will switch to close loop and that should set an engine code.
It is possible the engine does not have a MAF as it would have set a code if TPS reading is wrong. A wrong TPS reading should make MAF reading implausible and force the car into close loop and set a code.
拜学了，谢谢。
#51 Re: honda crv 2004 引擎加速无力
honda crv 2004 没有MAF, 和您写得这些有冲突吗？对不起，有点复杂，还不能完全看明白。
seymour 写了： 2024年 2月 24日 20:36 LOL.
You got be kidding me that honda vvti will affect TPS readings.
We are not talking about a BMW where the vanos motor can do arbitrary adjustments of valve lift. In that case, you do not even need a throttle body.
The BMWs do not have a throttle body to eliminate throttle loss.
The honda vvti has either 2 or 3 profiles on the intake side. Most likely the vvti on a CRV only has 2 profiles.
For throttle control, you need continuous adjustment from idle all the way to WOS. Not one profile for high speed one profile for low speed...
Also note that it is impossible to only rely on MAF to control fuel injection.
When the car just starts, the MAF won't have the correct reading as it needs to warm up to operating temperature.
Fuel injection is controlled only by throttle in an open loop operation. Only when the engine warms up, it switches over to close loop where the MAF and O2 sensor control fuel injection.
With MAF mal-function, the car will switch to open loop and that should set an engine code.
It is possible the engine does not have a MAF as it would have set a code if TPS reading is wrong. A wrong TPS reading should make MAF reading implausible and force the car into open loop and set a code.
#52 Re: honda crv 2004 引擎加速无力
楼主这是k24a1,前面还有k24a,固件早被日本人篡改过了，cmp灯早不会亮了
你妈，日本人也知道chain问题迟早爆发，丫就是不想掏钱
这世界上，日本人，囼巴子，全一个德性，产品保修期内坏了，那是你的问题，就是死活不给保修
你妈，日本人也知道chain问题迟早爆发，丫就是不想掏钱
这世界上，日本人，囼巴子，全一个德性，产品保修期内坏了，那是你的问题，就是死活不给保修
seymour 写了： 2024年 2月 24日 20:41 Stretched timing chain should set a cam position sensor code. It is hard to believe it leads to major drivability issues before the cam position sensor informs the ECU that engine timing is off.
Honda engine is pretty simple and cheap. Even that, It is hard to imagine they do not monitor cam position carefully to ensure the timing is good by the ECU.
#58 Re: honda crv 2004 引擎加速无力
出这个问题大概一个月之前，不小心高速上开过一个金属硬物，检查过车底部，没有发现异常损伤。只是bottom guard有个小破损，丢了一个铆钉，很简单补上了。之后几个星期，车开着没有任何问题。
另外，此车是二手车，前车主应该不太懂车，刚买来是40mph附近变速有明显颤动，我当时drain了engine oil, transmission oil, rear differential oil。车变得非常顺滑，肯定不是engine oil，不太肯定是transmission还是rear differential起了作用。
另外，此车是二手车，前车主应该不太懂车，刚买来是40mph附近变速有明显颤动，我当时drain了engine oil, transmission oil, rear differential oil。车变得非常顺滑，肯定不是engine oil，不太肯定是transmission还是rear differential起了作用。
#59 Re: honda crv 2004 引擎加速无力
I did assume your car has no MAF. It probably only have an intake temperature sensors.
Assuming your ECU is function normally, the only other reason I can think of that cause the TPS to go down when you press the gas pedal (without setting a check engine code) is stability control. That is pretty unlikely, though. You can turn off VSA and see if you can reproduce the loss power problem. I suppose your car has a VSA button.
Do you know if the car has drive-by-wire or it actually has a mechanical cable that pulls the throttle?
If it is a mechanical cable, then it rules out many possibilities. There is then a 90% chance you have a bad TP sensor.
Assuming your ECU is function normally, the only other reason I can think of that cause the TPS to go down when you press the gas pedal (without setting a check engine code) is stability control. That is pretty unlikely, though. You can turn off VSA and see if you can reproduce the loss power problem. I suppose your car has a VSA button.
Do you know if the car has drive-by-wire or it actually has a mechanical cable that pulls the throttle?
If it is a mechanical cable, then it rules out many possibilities. There is then a 90% chance you have a bad TP sensor.
#60 Re: honda crv 2004 引擎加速无力
Is your car 4 speed or 5 speed? Honda has some poorly made 5 speed transmission early 2004.
There original design of the H5 transmission uses a 3 shaft design that is a disaster.
Honda has many transmission problems early 2000 as they do not want to pay patent fees for planetary gear and ended up designing their own transmissions. It took them awhile to stabilize their design, which is actually quite efficient.
That being said, a transmission problem can not explain the inconsistent TPS reading and is probably unrelated to your current problem.
There original design of the H5 transmission uses a 3 shaft design that is a disaster.
Honda has many transmission problems early 2000 as they do not want to pay patent fees for planetary gear and ended up designing their own transmissions. It took them awhile to stabilize their design, which is actually quite efficient.
That being said, a transmission problem can not explain the inconsistent TPS reading and is probably unrelated to your current problem.
Altair 写了： 2024年 2月 25日 19:02 出这个问题大概一个月之前，不小心高速上开过一个金属硬物，检查过车底部，没有发现异常损伤。只是bottom guard有个小破损，丢了一个铆钉，很简单补上了。之后几个星期，车开着没有任何问题。
另外，此车是二手车，前车主应该不太懂车，刚买来是40mph附近变速有明显颤动，我当时drain了engine oil, transmission oil, rear differential oil。车变得非常顺滑，肯定不是engine oil，不太肯定是transmission还是rear differential起了作用。
#61 Re: honda crv 2004 引擎加速无力
真搞笑
美国哪有5速auto的crv？
美国哪有5速auto的crv？
seymour 写了： 2024年 2月 25日 22:18 Is your car 4 speed or 5 speed? Honda has some poorly made 5 speed transmission early 2004.
There original design of the H5 transmission uses a 3 shaft design that is a disaster.
Honda has many transmission problems early 2000 as they do not want to pay patent fees for planetary gear and ended up designing their own transmissions. It took them awhile to stabilize their design, which is actually quite efficient.
That being said, a transmission problem can not explain the inconsistent TPS reading and is probably unrelated to your current problem.