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Posted on Jan 02, 2017
SOURCE: 87 mustang idle problem
try unplugging the alternator and see if it still floods. I have seen this before where the alt causes interference with the computer and floods vehicle. Also check the ground cable from battery to engine make sure it is tight
Posted on Dec 13, 2008
Check for vacuum leaks. Also try cleaning the ISV.
If that doesnt work go to vwvortex.com and post your issue there
Posted on Jul 08, 2009
FIrst have you tried giving the engine a tune up (ie replaced the spark plugs)
Also you need to check the condition of all the vacumn lines on the engine loss of vacumn can cause poor idling.
Posted on Aug 16, 2009
SOURCE: My 93 GMC Suburban has
I assume it is a 5.7L V8, LO5 RPO. I would start with diagnosis of a misfire, Autozone can do this for free with a scan tool. Second, spark plug wires are notorious for degrading with heat over time--may be a wire. First, get it on a scan tool and see if you can identify the cylinder that is misfiring, and check the wire and or plug in that cylinder. You can always shut the vehicle off and remove one wire at a time, start the vehicle and when you come to the culprit, when the engine will not change its idling characteristics---and you found the cylinder by process of elimination.
Hope this helps
(I am assuming it is in the engine firing with my above statements)
Posted on Oct 04, 2010
With temperature related problems, check your intake manifold bolts for tightness. Our intakes are plastic and have a tendency to become loose, causing vacuum leaks. When it warms up, the plastic intake will expand sealing any leaks. But when it's cold, will contract, causing leaks. Easiest to check are cylinder #5 & 6 near the fire wall.
Also, clean your throttle body, a dirty throttle body will cause idle problems, especially in TB's because we don't have a true PCV valve, so gets dirty which causes sticking of the butterfly.
Posted on May 19, 2011
Tips for a great answer:
Here are the most common causes of idle surge, 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, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake
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