What causes rpm's to dip?

ASSISTANCE Electrical & Entertainment Systems
1

A little background:

I have had this problem pretty much since I bought the car (4 years now). When the car is at normal operating temperature and at idle, the RPM’s will “dip” when I load the electrical system. So, turn on headlights, defogger and hit the brakes and down it goes and the car starts to shake.

So people said to check the grounds so I did. Re-ran them from Batt to chasis to block ect but no change.

So FCM suggested I remove my crappy alarm system with the connectors that are cheap and can cause problems, so I removed it completely, made sure all wires were connected properly…No change.

So with the car idling I removed one fuse after another and the only one that had any effect was the Sunroof/Radio/Interior Light fuse. It didn’t completely fix the problem but the rpm’s did rise back up a a hundred or so. Could be that it is a problem area, could be that it is just responsible for a fair bit of load and makes the difference.

Anyone have any advice here? I really have no idea what to do/try next. It sucks because the car runs perfectly otherwise and I just cant stand this dipping and shaking.

Thanks

2

ive been told thats normal and ive just learned to deal with it lol

3

If the car didn’t shake I might be ok with it. But I get the feeling something else is wrong. Anyone?

When I turn on the Blower Fan while the headlights are on, pass side dims to less than half brightness and fogs and sidemarkers dim too. I definitely have something grounding out somewhere.

4

[QUOTE=Zenmachine;2266010]If the car didn’t shake I might be ok with it. But I get the feeling something else is wrong. Anyone?

When I turn on the Blower Fan while the headlights are on, pass side dims to less than half brightness and fogs and sidemarkers dim too. I definitely have something grounding out somewhere.[/QUOTE] Sounds to me like you still have a grounding problem some place.

When one circuit, [blower motor] has an effect on a seemingly unrelated circuit, [pass side head light] it is almost always a grounding issue.

The head lights or on a 12V constant power circuit, the blower motor is on a 12V switched circuit, but both share a “common ground”. 94