Re: Car rough idle problems need help.

Dave Cox wrote:
> Greg Rozelle <invaild@[EMAIL PROTECTED]
> wrote in news:fUpNi.4254$oA2.1319
> @[EMAIL PROTECTED]
> 
>> 1993 Nissan Altima GXE
>>
>> Car rough idle problem need help.
>>
>> I know I asked this before.    I am going to be a little bit more
>> detailed.
>>
>> When in park, neutral it shakes
>> When in reverse it shakes worse.
>> When in drive it shakes under 30 mph.
>> When going above 30 it shakes a lot less or does not shake at all.
>> Shakes at stops. 
>>
>> From Reading
>> Spark plugs & wires seem to be the most cause even if they look 
> new.
>> Wouldn't a compression test tell if it is bad spark plugs?
>>
>> Next is a fuel filter.   Which I am tempted to try. 
>>
>> The other is a fuel injector. 
>>
>>
>> Greg Rozelle
>>
>>
>>
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> 
> Compression test will only show worn Piston rings  or bad valve/valve 
> seats.
> 
> Test your plug wires  with an ohm meter  doesn't really matter what 
> reading you get   just as long as all the wires are close  I can't 
> remember what resistance plug wires have per foot,   but like I said  
> if one is bad you will see a very large difference.  Also look at the 
> plugs and see if  any are fouled (oil)   or are also burnt white 
> (which could indicate a lean running condition). like the wires  all 
> the plugs  should look like each other of one is differnet  then you 
> know you have an issue in that cylnder  which is causing the rough 
> idle.
> 
> Take the time and mark you plug wires before you take them off.
> 
> Good practice to change your fuel/air  filters  when ever you do a 
> tune up. You should be able to blow through the fuel filter fairly 
> easely (be carefull of gas) If it is acting like your trying to blow 
> up a balloon  your filter is plugged.
> 
When measuring with an ohm meter, the total from the coil to the plug, 
on any lead, should not be more than about 15,000 ohms.  If over, 
replace them all.