Ok, so I bought the car used at 73k miles about 3 years ago. The car I guess had the head worked oin due to blowen the headgasket. About 3-4 months after I bought the car I noticed the the car sometime had an electrical oscillation issue. What I mean when I say "electrical oscillation", I mean that all the cars lights, fog, headlight, inside, dash, dome & even the enginel oscillates when driving at any speeds. The issue, is that this occurs intermittently & stops or starts with no warning. I've already replaced the Battery, alternator, DME, Spark plugs & still nothing. I have taken the voltage when it's "oscillating", & the voltage drops to ~13.1v & goes up to ~16.3v. I've checked the negative ground cable in the trunk & it's in there tight. I'm wondering if maybe the DME relay may be the cause, or maybe the engine grounding strap. The thing is, I have NO IDEA where the hell is the engine ground strap/s are locted. I've used the Bently service manual to help me locate it & still nothing. Does anyone out there have any idea why my car is doing this & where the heck is the engine ground straps.
The car does have the original coil packs from Zundspule, which some were found to be defective, but I'm not sure if this would cause my issue. The DME was also replaced due to the famous flooding in that compartment.
Any help, would be VERY MUCH apprciated!!
By the way love the forum!! Only the 2nd time posting.
Oh, & all belts have been replaced with no change.