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1993 Isuzu Trooper

Tiny
MACHETE CANA
  • MEMBER
  • 1993 ISUZU TROOPER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 185,000 MILES
The car runs very ruff when cold (in the morning) after it warms up it works better. However stilll a little slugish, sometimes it runs ruff at all the time. I have noticed, that when I'm climing a bridge and I excelerate to keep speed it hazitates and it backs-fires. Also the O2 sensor light was on and now is off, the car ran fine when the light was on? Also the check engine light comes on when I drive it for about 10 miles or so, but when I come to a stop light it goes off. Then it goes back on untill I park. I have placed new plugs, wire, and air filter no results.?
Please help
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Friday, April 9th, 2010 AT 5:06 PM

6 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi machete cana,

When the CEL indicates, trouble codes would be stored in the PCM. Retrieve the codes and let me know what they are so we can uns=derstand the problem better.

RETRIEVING CODES
NOTE:
Trouble codes may also be referred to as DTC.

1. The MIL will come on when ignition is on and engine is not running. When engine is started, MIL should go off. If light remains on while engine is running, a trouble code is present.

2. If light does not come on with ignition on and engine off, check MIL circuit before continuing.

3. To retrieve codes, install a jumper wire between DLC terminals "1" and "3". DLC is a White connector located on right side of left foot well, ( some are located behind left of kickpanel). See Fig. 1.


https://www.2carpros.com/forum/automotive_pictures/192750_DLC93TrooperFig01_1.jpg



4. Turn ignition on and count number of flashes from MIL to identify codes. See Fig. 2. Each code will be flashed 3 times starting with lowest code number.

5. If system is operating properly (with no trouble codes present), Code 12 should be displayed with ignition on and engine off. This indicates diagnostic system is capable of storing codes and providing diagnostic information.

6. Once all codes are displayed, cycle will repeat. Remove jumper wire from DLC after codes have been retrieved.


https://www.2carpros.com/forum/automotive_pictures/192750_DLC93TrooperFig02_1.jpg



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Saturday, April 10th, 2010 AT 9:56 PM
Tiny
MACHETE CANA
  • MEMBER
  • 13 POSTS
Unfurtunely I thoght this would happen, I cant find it on the left fender wall, nor on the left or right kick plate. Nothing that looks like your diagram, no lose outlet that looks like a plug to get a reading. Any suggestions were else to look.
Please help.
See suggestion below
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Sunday, April 11th, 2010 AT 3:05 PM
Tiny
MACHETE CANA
  • MEMBER
  • 13 POSTS
In reference to the suggestion that I cant find the MLI plug, could it be a little black box thats 1/2 inch by 2 inches screw to the left fender wall? There is also another one on the right side in the same place. If it is how do you open it, it has some words on like MC-JA-.
Again please help
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Sunday, April 11th, 2010 AT 3:12 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
It is a 3 pin socket plug and if it is not found on right of left foot well, then it should be on the left of right kickpanel.

Sometimes the socket is hidden behind the main wire harness or taped to it. Did you check the right of footwell, near the center console?

The black boxes are not the diagnostic terminals.
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Sunday, April 11th, 2010 AT 3:31 PM
Tiny
MACHETE CANA
  • MEMBER
  • 13 POSTS
In reference to the diag. I finally found the plug and it gave me a code of the EGR valve, however, the problem continues it backs fire and and very rought, I have notice when I pull the wire of #3 cylinder the car continues to run with any diffrences in other words I have spark at the coil and at the spark plug, but if I remove the wire from the coil the car runs the same, like if the cylinder #3 is not working and I have good pressure at the cylinder? Please help
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Wednesday, April 21st, 2010 AT 3:40 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
A malfunctioning EGR valve can cause misfinrg and the symptoms you described.

I am not very familiar this engine so you would have to correct me if I am wrong.

Since the 3rd cylinder is misfiring, it could be a vacumn leaks to the cylinder.

Check the intake manifold for the 3rd cylinder for vacumn leaks. If the EGR vacumn is attached to the intake manifold of this cylinder, temporarily plug it and retest.
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Thursday, April 22nd, 2010 AT 8:58 AM

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