Question about 1998 GMC Suburban

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Running rough 1998 Sub. someone removed the catalatic converters one and a half year ago. The problems started about 6 mo. ago. It had a rad. leak and ran hot with my wife. I had to get the head gaskits replaced and radiator fixed. ran good for a while then started having a hesatation when backing up and turning the wheel. Sometime latter it quit on my wife. put a fuel filter on and it ran ok. but not good. It quit on us again. After a while it started. I had the fuel pump changed and filter again but the next day it quit again. Replaced distributer and cap. Started and ran just ok had a little miss. Had timeing adjusted and it ran better also put new plugs. Still running rough. The pipes are rattling underneath a little. I am going to have them checked. Do you have any sugestions?

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Get rid of this car sir, its a lemon. With everything you've changed the only thing left is checking parimeters on a scan tool for the senors. But you gotta know what your looking at.

Posted on Jun 23, 2009

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  • GMC Master
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Check the distributor module (ICM), it may have gone bad and needs to be replaced. It's around $40.00 and it's under the rotor in the distributor assembly. Check the red lead wire to the HEI for voltage, there should be 12 volts. It common for the ICM to fail on the HEI system when they heat up and if you go to Auto Zone, they can give you the step by step instructions to replace the ICM. Good luck and keep me posted, be glad to help.

Posted on Jun 23, 2009

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