1998 GMC Yukon starts runs for 2 secs then stalls

Tiny
JMURPHY1962
  • MEMBER
  • 1998 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 87,400 MILES
I disconnected the battery to install a nutral safety switch sucessfully. Than I removed the instrument cluster to troubleshoot an inop tach. Unsucessfully. When I drove the car the speedo was eratic so I removed the cluster to check my work but when I reinstalled the negative battery cable I had left the ign switch in the on position. The car started and drove but the security light was on steady but not blinking. I turned it off and restarted it the security light was out. The following morning I tried to start it and it just won't run for longer than a couple of secs. I looked on line about the whole passlock sys problems and think there might be a connection. These are the facts The security light goes off after turning the key to the run position after a few secs. Then it will come back on if I leave the ign switch on for a few minutes longer.I have tried the ten minute routine to reset the passlock sys in an attempt to get it to start. With no luck. I linked my OBD2 code reader to the car and I get an error message stating LINK ERROR unable to link.I know the code reader works because it works on my other car and it worked on the yukon just the day before when I cleared a knock sensor code. I poured some fuel down the throttle body and it ran longer than when I don't.I feel that the computer is shutting down the fuel delivery.I am a fairly competant home mechanic with a pretty good set of tools. I need help in troubleshooting this one
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Sunday, August 9th, 2009 AT 12:59 PM

5 Replies

Tiny
JMURPHY1962
  • MEMBER
I have not recieved a response as promised so I would like a refund of the donation
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Monday, August 10th, 2009 AT 4:44 PM
Tiny
MERLIN2021
  • EXPERT
Refund is VIA the ORANGE ADMINS. But here's a suggestion, whether or not you pay, This is right from GM, and where you replaced the cluster, if not re-installed right will give these problems, also after it's installed, you turn the key to "on" for ten seconds then start it, this initializes the new cluster to the existing modules.
INSPECTION OF RELATED WIRING HARNESS CONNECTIONS WHEN DIAGNOSING MISC. DTCS, INTERMITTENT DRIVEABILITY CONCERNS, HARD START, NO START, INCORRECT GAUGES, INOP I/C SYSTEMS, SES/4WD LAMPS ILLUMINATED TECHNICAL SERVICE BULLETIN Reference Number(s): 03-06-04-012A, Date of Issue: August 10, 2005 Related Ref Number(s): 03-06-04-012, 03-06-04-012A ARTICLE BEGINNING SERVICE INFORMATION When servicing a vehicle for any type of customer concern, the following steps are imperative. Inspect and ensure the integrity of all related wiring harness connectors. If the wiring harness connectors are not properly put together or engaged before they are locked together, numerous types of intermittent conditions may occur, which may include any of the symptoms listed above and possibly others. The first step in any type of electrical diagnosis is a visual and physical inspection of the wiring harness connectors for integrity. Many times, the vehicle may be repaired just by disconnecting and reconnecting the connectors. As with all repairs to wiring harness connectors and terminals, a pull test of the terminals within the connector should be performed. A pull test is performed by inserting the proper size terminal test tool (not a paper clip) into the terminal to determine whether or not the terminal is making good contact, or whether the terminal has been damaged from the prior improper connection or lack of connection. The J 35616-64A or B probe has been designed for these terminals that may be both a round or square design. For example, if the Connector C2 of the engine wiring harness to the Powertrain Control Module (PCM), for the 2.2L equipped Cavalier or Sunfire is not properly seated into the PCM: The cam lock lever may close, however improperly. The cam lock lever may even snap out of position. The vehicle may have an intermittent condition with any one of the components which are controlled or monitored by the PCM. Press Ctrl+F to find exact text Affected Model(s): 2006 and Prior Cars and Light Duty Trucks 2003-2006 HUMMER H2 2006 HUMMER H3 2005-2006 Saab 9-7X Supercedes: This bulletin is being revised to add models, model years and additional information. Please discard Corporate Bulletin Number 03-06-04-012 (Section 06 - Engine/Propulsion System). NOTE: Most terminals used in current module connectors (ECM, BCM, EBTCM and the like) are small 0.64 mm sq. Terminals and can be damaged by probing with the wrong tool. THE CAM LOCK LEVER IS DESIGNED TO PULL (OR ASSIST) THE CONNECTOR INTO ITS FINAL POSITION ONCE IT HAS BEEN PRESSED STRAIGHT INTO THE PCM HEADER PAST THE INITIAL DETENT, ALLOWING THE LEVER TO BE MOVED INTO THE LOCKED POSITION. It is not only a retainer but an assist during the connection process. When the wiring harness connector is properly connected to the PCM, a snap will be heard when the connector is in position to be fully seated. The cam lock lever may then be closed. The cam lock lever will then do its designated job as both an assist and ensuring the connector does not come apart due to vibration or other types of conditions found in vehicles as they travel down the highway. Remember, if a terminal (metal) or the connector (plastic) is damaged, they should be replaced. DO NOT replace the complete wiring harness assembly. Some harnesses are now on order restriction since most harness damage can be repaired. Terminals and terminal removal tools are in the J 38125 Terminal Repair Kit and pigtails or complete connectors can be obtained through normal parts ordering procedures OR from GMSPO and Saab PDC along with tape or conduit.
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Monday, August 10th, 2009 AT 5:20 PM
Tiny
JMURPHY1962
  • MEMBER
Thank you for your reply. I Didn't replace the cluster but remove test and reinstall. The printed circuit on the back simply rests on a series of pins to connect it to the harness. I can't imagine how I could have screwed that up, but any thing is possible. The truck was damaged in an accident about 2 yrs ago and the harness connectors were all pulled apart and reinstalled I can go and check all of those, again. Is there a possibility that this is related to the neutral safety switch? Also could you give me your opinion on why the OBD2 code reader can't communicate with the trucks computer system I feel that this is likely related. Finally would you recommend a step by step procedure for testing and diagnosing which system is the problem.
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Monday, August 10th, 2009 AT 7:57 PM
Tiny
MERLIN2021
  • EXPERT
Usually the communication error is a fuse in the underhood fuse box(power distribution) Some are marked Cigar! But check all ECM. PCM and IGN.
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Tuesday, August 11th, 2009 AT 2:53 AM
Tiny
2CARPROS MIKE
  • ADMIN
We have refunded your donation per your request. I hope the information our tech has provided you helps. Have a nice day.
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Tuesday, August 11th, 2009 AT 6:41 PM

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