rough idel bad fuel milage

Reply

  #1  
Old 06-29-02, 08:19 AM
ron kroll
Visiting Guest
Posts: n/a
rough idel bad fuel milage

1989 dodge caravan 2.5 eng 111,000 miles ran
great til last week has a rough idel and getting bad fuel miles change the plugs ran ok for about 5
miles changed the map sencor still the same any
ideas should i change the og sencor? the egr valve
is good thanks
Ron
 
Sponsored Links
  #2  
Old 06-29-02, 01:11 PM
Member
Join Date: Dec 2001
Posts: 2,538
well start by checking your codes in the computer cycle your key on,off 3 times leaving it on the third time and count the flashes of the check engine or power loss light per example a code 13 would be 1 flash short pause and 3 more flashes, was the spark plugs you pulled out of it black ?
see what code you have if any and go from there on what needs to be repaired.
 
  #3  
Old 06-29-02, 02:56 PM
ron kroll
Visiting Guest
Posts: n/a
thanks bejay will do that also plugs were black
thanks again
 
  #4  
Old 06-30-02, 07:12 AM
Joe_F
Visiting Guest
Posts: n/a
Black on the plugs indicates a rich running condition......too much fuel.

A plethora of things can cause that.

Things I would do:

1) Complete tune up..all filters, plugs, wires, cap and rotor. Use good quality parts and don't skimp. A pickup plate in the distributor is also a common problem too, I'd go for that.

2) Change the O2 sensor, MAP sensor (complete with the revised bleed package from Chrysler), coolant temp sensor. They are all common failure points on this thing.

I say all this as from your description, it sounds like the truck has not seen a THOROUGH servicing in a very long time.
 
  #5  
Old 07-01-02, 02:39 PM
ron kroll
Visiting Guest
Posts: n/a
Thanks Joe F
i changed the plugs, plug wires,map sensor,oil
air and gas filters,rotor,new fuel pump,new injector, replaced most of the vacuum lines & pcv
the only thing i have not changed is the O2 sensor
can it be the cat converter?

thanks again
Ron
 
  #6  
Old 07-01-02, 05:13 PM
Member
Join Date: Dec 2001
Posts: 2,538
the o2 sensor as joe said can cause a rich condition and is probably as fouled as the spark plugs by now, a plugged convertor can cause a rich condition, timing belt being off 1 or 2 teeth or a cylinder with low compression can also cause a rich condition cause your engine vacum will be low and the map sensor will tell the computer it needs more fuel, there is so many possibilities you may have already spent more than what the van is worth so you might want to take it to a shop and have it diagnosed instead of replacing every sensor on the vehicle hoping that it might fix your problem.
 
Reply


Thread Tools
Search this Thread
Display Modes
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 03:40 PM.