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Joined: Nov 2002
Posts: 2
Newbie
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OP
Newbie
Joined: Nov 2002
Posts: 2 |
my 1996 contour, V6 2.5L is running badly. Rough idle/ stalling/ jumping idling rpm. When started cold runs like crap BIG TIME I have to play with the gas peddle just to keep it running, then after the engine warms up it can maintain a rough lower idle at traffic lights. it stays rough even on a long drive. It has 75,000 miles.
The code reader for the check engine light shows P0171,P0174 for bank 1 too lean and bank 2.
I tried some fuel injector cleaner with no success.
Any help/ideas appreciated
Jim
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Joined: Jul 2002
Posts: 1,459
Hard-core CEG\'er
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Hard-core CEG\'er
Joined: Jul 2002
Posts: 1,459 |
Possible cause would be defective vacuum lines.
95 Contour Zetec, ATX (wrecked, sitting in the barn)
95 Mystique Zetec, MTX
2000 Taurus SEL 3.0L Duratec
1994 Crown Victoria LX 4.6 V8
1993 Chevy Silverado 4.3 V6
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Joined: Oct 2000
Posts: 770
Veteran CEG\'er
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Veteran CEG\'er
Joined: Oct 2000
Posts: 770 |
Everytime I had lean bank 1 and 2 it was a dirty MAF. Tour 2 had rough idle a few times but no codes (it is OBD I) and it was an ignition problem every time. Bad coil pack once and 2 bad plug wires over the years. You will hear a misfire in the exhaust stream. Misfire usually will show up as rich, not lean. Like BW said, look for vacuum leaks too. Could be loose hose clamps, cracked vacuum lines, intake manifold or injector gaskets. Use the carb cleaner method of looking for leaks if you are careful. Spray it around the gaskets and see if the idle changes.
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Joined: Oct 2002
Posts: 2,408
Hard-core CEG'er
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Hard-core CEG'er
Joined: Oct 2002
Posts: 2,408 |
Vacuum leak or dirty MAF, glad we agree!
Check the hose from the intake to the PCV valve, and the fresh air tubes from the valve covers to the intake tube.
The other vacuum lines can leak too but they usually trigger other codes. Press down on the intake to see if you can make it smooth out.
If it runs better after you fix the lean condition but it still seems rough, plugs and wires should fix that.
"Those who cannot remember the past are condemned to repeat it" -George Santayana
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Joined: Jun 2002
Posts: 50
CEG\'er
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CEG\'er
Joined: Jun 2002
Posts: 50 |
How do you cure a dirty maf? what is the indication that your maf is dirty? Do you just replace the maf sensor?
Realness
1999 Ford Contour LX
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Joined: Aug 2002
Posts: 289
CEG\'er
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CEG\'er
Joined: Aug 2002
Posts: 289 |
I am pretty sure the MAF can be cleaned. Replacement is a little spendy. I checked fordpartsonline yesterday and a new MAF was $129 for my 1995 Ford Contour LC V6 2.5 auto tranny.
1995 Contour LX
238,000 miles
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Joined: Oct 2002
Posts: 2,408
Hard-core CEG'er
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Hard-core CEG'er
Joined: Oct 2002
Posts: 2,408 |
A dirty MAF can be identified by the type of jokes it tells.
"Those who cannot remember the past are condemned to repeat it" -George Santayana
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Joined: Oct 2002
Posts: 2,408
Hard-core CEG'er
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Hard-core CEG'er
Joined: Oct 2002
Posts: 2,408 |
Actually, dirt on the MAF causes a general lean condition.
Sometimes they also become s-l-o-w which causes a stumble.
A can of electrical cleaner spray aimed at the elements in the little hole (view from front) is often sufficent. Otherwise dismantle carefully and clean gently with alcohol on a cotton swab.
"Those who cannot remember the past are condemned to repeat it" -George Santayana
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