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2002 focus with a p0301 error code
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tidtheman Offline
#1 Posted : Wednesday, October 20, 2010 3:29:16 AM(UTC)

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I`ve done a search on a well known search engine for information and advice and got some useful information.
I am looking for advice on where to start to diagnose and fix in a scheduled manner.
I have read that that change the injector from cyl 1 to 3 or 4 to see if the problem moves with the injector, clean the MAF sensor, check compression, make sure crankcase is not under vaccuum etc...
Anyone advice on what to check first and so on so i can try to fix in a systematic manner?
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kilmory Offline
#2 Posted : Wednesday, October 20, 2010 4:09:04 PM(UTC)

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You may check:
Spark Plug
Ignition Lead
Coil Unit - common on all Fords
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tidtheman Offline
#3 Posted : Thursday, October 21, 2010 12:43:13 AM(UTC)

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plugs, ht leads and coil pack ok, maybe check injectors next, what do you suggest?
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toniasupalding Offline
#4 Posted : Thursday, October 21, 2010 9:23:10 PM(UTC)

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l take it not but your heading sound like it is .. have u tried a coil or just checked it ?
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travelvietnam Offline
#5 Posted : Friday, October 22, 2010 1:32:08 AM(UTC)

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Hi tid
if it is a petrol engine there are 3 air hoses under inlet manifold with 2 of them usually splitting and drawing in air,replacement kit is of 3 breather hoses. 1.4 engine.
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ScanPro Offline
#6 Posted : Friday, October 22, 2010 4:12:05 PM(UTC)

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If it's diesel you may find the injectors are coded to each specific cylinder so moving will do no good if they are coded it's possible the ecu got corrupted
Autohex is the best scan tool
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tidtheman Offline
#7 Posted : Saturday, October 23, 2010 7:18:06 AM(UTC)

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Hi all,
sorry it is as Autohex says:
1.8 zetec PETROL.
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JogosOnline Offline
#8 Posted : Saturday, October 23, 2010 4:38:14 PM(UTC)

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Ok, if its not coil pack then be careful, there is a program connected to fuel sender that tells the ecu vehicle low on fuel this creates a miss fire, hence go to petrol station. Have been know to go faulty for no reason.
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ScanPro Offline
#9 Posted : Sunday, October 24, 2010 7:18:06 AM(UTC)

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Tid:
-check compression on No1 cylinder
-Could be faulty injector - but beware injectors on this model are coded and need to be set up with Auohex
Autohex is the best scan tool
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08Jeri15 Offline
#10 Posted : Sunday, October 24, 2010 4:38:14 PM(UTC)
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check the air hoses around inlet manifold,do u hear an air hiss? 1.4 engine a problem with air hoses leak,cant picture the 1.8.
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tidtheman Offline
#11 Posted : Monday, October 25, 2010 12:45:14 AM(UTC)

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Thanks guys, the problem solved.
I just replaced the injector with a brand new one.
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