Engine Miss / Battery Light Flashes
Thread Starter
Racer
Joined: Mar 2002
Posts: 388
Likes: 0
From: Acworth Georgia
Engine Miss / Battery Light Flashes
Guys,
Car has been running fine since new motor install until today. Went over to a buddy's house, car drove fine. Hopped in it to leave and the car has a bad miss in it now. Also, I noticed when the engine is under load the miss obviously is worse, but the battery light flashes/flickers. Any thoughts? Opti has been replaced a year or two ago and has probably less than 5,000 miles on it.
Car has been running fine since new motor install until today. Went over to a buddy's house, car drove fine. Hopped in it to leave and the car has a bad miss in it now. Also, I noticed when the engine is under load the miss obviously is worse, but the battery light flashes/flickers. Any thoughts? Opti has been replaced a year or two ago and has probably less than 5,000 miles on it.
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Re: Engine Miss / Battery Light Flashes (Hi-psi)
Engine miss is most often due to weak or no spark. Measure each plug wire one at a time with an ohmeter. The carbon center ones are about 5000 ohms per foot. Defective ones have way more resistance per foot then this. Let engine idle with hood up in the dark and look for sparks along the plug wires. Plug wires that have been burned on the manifold or have pinholes in their insulation and are too close to metal may spark to ground which means that plug did not fire. A flashing battery symbol means that the alternator isn't charging the battery. Check for loose nut on the alternator output and be careful not to touch ground with your wrench because this wire goes to the battery through a fusible link. Grounding your wrench will cause sparks and probably a blown fusible link. Also check for nut tightness on the jump start terminal behind the battery. Remove the battery cables (neg first) and clean the cable lugs and battery terminals and replace (neg last).
Racer
Joined: Oct 2003
Posts: 273
Likes: 0
From: Midland Texas
Re: Engine Miss / Battery Light Flashes (jfb)
If your miss is causing the vehicle to idle too low when it misses, the charging light will flicker because the pully will not be spun fast enough to charge...
Thread Starter
Racer
Joined: Mar 2002
Posts: 388
Likes: 0
From: Acworth Georgia
Re: Engine Miss / Battery Light Flashes (autotech)
For what it's worth, the car has a set of Taylor wires with only about 3k miles on them, and a brand new battery. I still show around 13.9-14.3v while the car is idling or running down the road. When idling, you cannot hear the miss, or when revving......only when the engine is under load. I'm gonna try to check all the wires tomorrow and just have an all around good look under the hood.
