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s**t
发帖数: 342 | 1 2003年的老马6，140Kmile, 其实也可以退休了，正好拿它来练练手。
长话短说：
引擎灯总亮，开始是p2187(Fuel system too lean at idle - bank 1)
于是换了MAF sensor;
过了几天灯又亮，读code是p302（cylinder #2 misfire)，于是把spark-plug和cable
一起换了（当时看到#2的cable非常松，都突出来了，不知道怎么回事）
再过一两周灯还亮，读code是p300（random cylinder misfire)，出现有时候停车熄火
（得油门给点油） ...
下一步该如何？（如果自己可以比较容易做的可以考虑，要不然还是去车铺）
喷油嘴（fuel injector)?
oxygen sensor 影响不到发动机本身（idle时转速忽高忽低）吧？
PCV有关系不?
BTW:
Diagnosing code P2187
Fuel system too lean at idle - bank 1
Possible issues:
1. Large vacuum leak
2. Fuel System malfunction
3. MAF sensor faulty
4. Ignition system malfunction
a) Check over the MAF and Sylenoid . Clean them.
b) Check all hoses
c) check all clamps and screws are tight
d) check the spark plugs
P0302 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer
A code P0300 may mean that one or more of the following has happened:
Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
Defective computer | b***k
发帖数: 654 | 2 pcv hose 破了
cable
【在 s**t 的大作中提到】
: 2003年的老马6，140Kmile, 其实也可以退休了，正好拿它来练练手。
: 长话短说：
: 引擎灯总亮，开始是p2187(Fuel system too lean at idle - bank 1)
: 于是换了MAF sensor;
: 过了几天灯又亮，读code是p302（cylinder #2 misfire)，于是把spark-plug和cable
: 一起换了（当时看到#2的cable非常松，都突出来了，不知道怎么回事）
: 再过一两周灯还亮，读code是p300（random cylinder misfire)，出现有时候停车熄火
: （得油门给点油） ...
: 下一步该如何？（如果自己可以比较容易做的可以考虑，要不然还是去车铺）
: 喷油嘴（fuel injector)?
| m**********e
发帖数: 12525 | 3 对，楼主所有钱都白花了，唉，这三脚猫就是费钱
【在 b***k 的大作中提到】
: pcv hose 破了
:
: cable
| s**t
发帖数: 342 | 4 这倒没事，被人宰一样得掏，还不知道到底怎么回事。
这会儿至少心里明白，攒点经验值，而且老车很多配件换了可能开着也放心点。
回头看看这个pcv hose怎么回事，再上来汇报
多谢多谢
【在 m**********e 的大作中提到】
: 对，楼主所有钱都白花了，唉，这三脚猫就是费钱
| s**t
发帖数: 342 | 5 找了几个修车铺，似乎都没啥兴趣听我说只要换换PCV。
自己研究了一下似乎这个2003 Mazda6 2.3L的PCV位置很隐蔽，不知道有没有人有这么
做的？
需要先把intake manifold拆下来，总共8个大螺丝有些很难整。
2003 Mazda 6 2.3L FI
The pcv valve is located behind the intake manifold, with some patience and
small hands you can get to it. First unplug your negative battery cable, You
must remove the 8 bolts holding the intake to the engine, there are several
vacuum hoses and sensors that must be unplugged, the oil tube must be
unbolted, there is a hole in the middle of the intake with a bolt in it,
tough to get to but it can be done with patience, there is also a bolt you
will have to get to from under the vehicle. I removed the throttle body for
easier removal and to go ahead and clean it. Removal is always harder then
installation as you get familiar with the procedure. If you need help i can
do a step by step, i just finished fabricating a new hose for a pcv and
reinstalling it. You can not get the molded hose from an auto parts store, i
used 2 90 degree elbows and 3 pieces of hose, this makes the hose more
durable with less span between connections and less chance of another crack
in it.
【在 s**t 的大作中提到】
: 这倒没事，被人宰一样得掏，还不知道到底怎么回事。
: 这会儿至少心里明白，攒点经验值，而且老车很多配件换了可能开着也放心点。
: 回头看看这个pcv hose怎么回事，再上来汇报
: 多谢多谢
| s**t
发帖数: 342 | 6 上来反馈一下：
找了家门口感觉还比较靠谱的修车铺花了300多（3小时x85 和一些seal，hose等）换了
PCV。
感觉油门稳当一些，但是idle的时候还是转速往下掉，而且容易熄火。但是没有引擎灯
亮。
再到处学习考察了一下，很像是throttle body的事，早上起来照着下面链接的内容给
它搽搽干净（确实有些黑油墨），然后上电idle了好长时间让车子再自我调整。现在开
起来已经比较稳定了，当然得多开几天再看看。
http://www.autoserviceprofessional.com/article/91698/how-to-fix
Bulletin No: 01-007/09
Last Issued: 02/11/2009
Subject:
UNSTABLE IDLING/ENGINE STALLS JUST AFTER STOPPING
APPLICABLE MODEL(S)/VINS
2003-2009 Mazda6 with 2.3L/2.5L (including Mazdaspeed6)
2004-2009 Mazda3 (including Mazdaspeed3)
2006-2009 Mazda5
2006-2009 Mazda MX-5
2007-2009 Mazda CX-7
DESCRIPTION
Some vehicles may exhibit a concern of unstable idling or, in some rare
cases, stalling, just after the vehicle stops with no DTCs detected. The
problem is due to the accumulation of carbon deposits inside the throttle
body causing air flow to decrease.
Customers having this concern should have their vehicle repaired using the
following repair procedure and the Workshop Manual.
REPAIR PROCEDURE
1. Verify customer concern.
2. Remove the throttle body.
a. Write down the customer's radio station presets.
b. Disconnect the battery terminals.
c. Remove the air hose from the throttle body.
d. Disconnect the throttle body connector.
e. Remove the throttle body from the intake manifold with the water hose
connected.
3. Clean the throttle body.
a. Clean the inside throttle body on the air hose side using a clean and
soft shop cloth sprayed with engine cleaner (part number 000-77-A86) along
the cross hatch areas, and especially around the circled areas as shown.
CAUTION:
DO NOT spray the cleaner directly inside the throttle body and DO NOT wipe
around the throttle valve shaft shown with an X.
b. Turn the throttle body to clean it at the intake manifold side.
c. Clean the throttle with the throttle valve opened using the same shop
cloth and cleaner.
WARNING:
Be careful not to pinch your fingers in the throttle valve when it is opened
because the valve will close automatically from spring tension.
CAUTION:
DO NOT spray the cleaner directly inside the throttle body and DO NOT wipe
around the throttle valve shaft shown with an X.
d. Make sure there is no foreign material inside the throttle body.
4. Re-install the throttle body using a new gasket.
5. Connect the battery cables.
6. Perform the throttle valve position learning and idling engine rpm
inspection.
a. Connect the M-MDS.
b. Turn the ignition to ON without starting the engine for one minute, then
turn it to OFF.
c. After one minute has passed, start the engine.
d. Warm up the engine at idling until the cooling fan starts operating or
until the coolant temperature reaches 194°F (90°C) or higher.
e. Turn off any electrical load, including the A/C, with the shifter in
Neutral or Park position.
f. Let the engine run for five minutes.
g. Measure the engine rpm at idle using the M-MDS to confirm it is within
specification according to the Workshop Manual.
7. Verify repair.
8. Enter the customer's radio station presets.
9. Perform "Power Window Initialization Procedure" on vehicles
with AUTO UP/AUTO DOWN windows.
10. Inform customers with vehicles with memory seats that the memory
positions will need to be set again to their desired positions because the
battery was disconnected.
PART(S) INFORMATION
WARRANTY INFORMATION
and
You
several
【在 s**t 的大作中提到】
: 找了几个修车铺，似乎都没啥兴趣听我说只要换换PCV。
: 自己研究了一下似乎这个2003 Mazda6 2.3L的PCV位置很隐蔽，不知道有没有人有这么
: 做的？
: 需要先把intake manifold拆下来，总共8个大螺丝有些很难整。
: 2003 Mazda 6 2.3L FI
: The pcv valve is located behind the intake manifold, with some patience and
: small hands you can get to it. First unplug your negative battery cable, You
: must remove the 8 bolts holding the intake to the engine, there are several
: vacuum hoses and sensors that must be unplugged, the oil tube must be
: unbolted, there is a hole in the middle of the intake with a bolt in it,
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