Weak battery = erratic ignition??, think I solved my problem........ Options

[Mueller]

History:

Kept getting an ignition related miss during idle and it was worse when I rev'd up the motor....

I started to think it was just due to my plugs being overly fouled from the too rich mixture while tuning the FI.

I cleaned the plugs, still had a miss, removed the HyFire CDI from the loop, still had a miss.....

During the entire time of trying to tune the motor, i had a 2 year old Optima battery in the car which had hardley any use on it, I also had my batter charger hooked up and turned onto 2amps and sometimes 15amps....still would get a miss

I had problems starting the car and cranked the battery charger to 50amps...car started right up and no ignition miss (IMG:http://www.914world.com/bbs2/html/emoticons/screwy.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/boldblue.gif)

Time to go get a new battery............

[lapuwali]

Low battery voltage will cause all kinds of problems with EFI systems. Most ECUs have some sort of compensation to adjust injector timing based on actual battery voltage. A voltmeter hooked directly to the battery terminals is a great accessory when running EFI, esp. D-Jet, which does a pretty bad job of compensating for low voltage (tends to make the car run rich).