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1991 Dodge Shadow MAP Sensor codes and high idle

Tiny
JUSTDON
  • MEMBER
  • 1991 DODGE SHADOW
Engine Performance problem
1991 Dodge Shadow 4 cyl Front Wheel Drive Automatic

2.5 (non-turbo) engine idles at 2000 rpm and drops to about 1500 when placed in gear. Codes 12, 13, 14.

I know the battery disconnect caused the code 12

According to the information I have, the codes 13 and 14 refer to the MAP sensor.

I replaced the MAP sensor (twice) with used sensors and checked the the vac. Lines from the throttle body to the sensor. I located a ground wire that had broken from the O2 sensor plug to the engine block. Repairing this made no difference. I also unplugged the MAP while the car was running and it did not change the car's idle.
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Sunday, June 22nd, 2008 AT 10:49 PM

4 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Check for vaccum leaks in all the lines, and also check base timing.
It is also possible that if the car recently backfired, it may have bent the throttle body plate, allowing more air into the engine.
The air could also be coming from the other sources such as bad injector O-ring, or intake manifold gasket leaking.
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Tuesday, June 24th, 2008 AT 7:22 AM
Tiny
JUSTDON
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Would a possible vaccum leak address both issues, or just the idle?
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Tuesday, June 24th, 2008 AT 2:35 PM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Yes it should. Vaccum leaks give one reading to one sensor, but another reading to another, causing a conflict and error code.

In other words, if the MAP is reading partial throttle, but the TPS is reading closed throttle, the ECM will set an error code.

Vaccum lines get brittle with age and can easily crack if disturbed. They can be hard to see because of their color (black) and dirt and debris covering them.

Also check the MAP sensor vaccum line and other lines like the brake booster.

Some shops have a device that generates "smoke", they generate smoke and direct it over the engine looking for anyplace where it is sucked into the engine to isolate the line or gasket that is leaking.
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Wednesday, June 25th, 2008 AT 6:30 AM
Tiny
JUSTDON
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  • 150 POSTS
The map sensor code is now gone. There was a vaccum leak in the plastic tubing.

I also found that someone had the vaccum lines completely wrong. After fixing the routing and the leak in the MAP line, the car idles and runs great now.

Thank You for your help AGAIN. Lol
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Wednesday, June 25th, 2008 AT 1:59 PM

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