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ECU problem?

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Was wiring to ECU from ALT checked for grounding? Was ALT removed and bench tested may have grounded field wiring?
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Tuesday, August 11th, 2020 AT 6:26 PM (Merged)
Tiny
ROB OTIS 29
  • MEMBER
  • 1 POST
  • 1991 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 141,172 MILES
My 91 jeep runs fine, could be for days or weeks even. Then it will hitch for a few moments then die. It will start then die right out again. I've replaced the crank position sensor and the distributor sync sensor(stator) But it does it all over again. This problem comes out of nowhere and the wheather and driving condistions are allways different, any advise or direction you could point me in would be appreciated.

Thank you and god bless
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Tuesday, August 11th, 2020 AT 6:26 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Is your check engine light on? If yes turn the key from off to on three times, on the fourth one leave it in the on position, count the flasshes.22 would flash as 2 blinks, then a short puase, then 2 more blinks. If several codes are stored, the pause is longer between codes, code 55 will be the last code. Do this and post all codes found.
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Tuesday, August 11th, 2020 AT 6:26 PM (Merged)
Tiny
JODYDAY29
  • MEMBER
  • 1 POST
  • 1990 JEEP CHEROKEE
Engine Mechanical problem
1990 Jeep Cherokee 6 cyl Four Wheel Drive Automatic 146.00 miles

put it fuel injectors, alternator and sepenten belt in last week. Now I get about 2 miles a gallon, Already unhooked battery cables to reset computer to injectors Fuel pump and filter are new too. What am I missing?
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Tuesday, August 11th, 2020 AT 6:26 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Do you have a check engine light? If so get the computer scanned for for code/s-sounds like its running rich

Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.
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Tuesday, August 11th, 2020 AT 6:26 PM (Merged)
Tiny
MAURY_71
  • MEMBER
  • 1 POST
  • 1989 JEEP CHEROKEE
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
I did the oil change but I can't remove the advice of the computer that says: oil change is required
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Tuesday, August 11th, 2020 AT 6:26 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Try below if it works

. Just like the good ole G.M.'S Key on engine off, depress accelerator 3 times to the floor within 10 sec. Otherwise you need to use a DRB to reset it
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Tuesday, August 11th, 2020 AT 6:26 PM (Merged)
Tiny
EKLAW
  • MEMBER
  • 1 POST
  • 1990 JEEP CHEROKEE
  • 6 CYL
  • 2WD
  • MANUAL
  • 233,330 MILES
HOW TO GET CODES OUT AND WHAT KIND OF SCANNER 88 TO 90 HAVE THERE OWN DIAGNOSTIC
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Tuesday, August 11th, 2020 AT 6:26 PM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
You need special adapter for Jeep's diagnostics. The adapter converts signals into a form the DRB-II can utilize in performing tests. Probably just as cheap and easy to take to local shop to get the codes retrieved.
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Tuesday, August 11th, 2020 AT 6:26 PM (Merged)

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