Question about 1998 GMC Yukon
I have a 1998 yukon with 252,000 miles. New factory transmission at 160,000, K&N cold air injection kit at about 180,00, tune up at 200,000. Cold air injection was great for performance. My problem now is while accelerating up a hill (more load on engine) it will start hesitating, then vibrates the whole car. I cannot tell if it is a serious missing (engine) or transmission. When you back off of it, it will continue to shake car for about a 10 th if a mile and then smooth out. Is this most likely an engine / tune up problem or transmission?
The problem is most likely break down of the spark plug wires. The demands on the spark during acceleration and load destroy the wires as they age. I would start there. Hope this helps.
Posted on Jan 28, 2009
did you have code cleared and also try fuel injector cleaner, as a clogged or dirty injector can show as a misfire,
Posted on Mar 16, 2009
SOURCE: acceleration hesitation
Depends how long since your last tune up and mileage. I would do a normal oil change, oil filter, air filter and plugs. If she still does it, try checking for a vacuum leak. Start the vehicle and spray "lightly" carb cleaner around your vacuum lines. If you have a leak the engine will increase in idle suddenly. Replace the line or part. AS A LAST resort and pretty rare is the distibutor. They usually run about 75.00 to 110.00...hope this helps.
Posted on Jun 30, 2008
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Posted on Jan 02, 2017
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Jun 29, 2016 | 2007 Mercury Mountaineer
Sep 12, 2012 | 2003 GMC Yukon
Here is the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours.
To correct this problem Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional.
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