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Car shuts off/ drops idle when coming to a stop

B

Beatdowncity

New member
Im back again!

So after i drive my car for about 15 minutes, sometimes when i come to a complete stop i will see my RPM's drop to about 500 the lights on the dash will dim a bit but then it will go back up to about 800 rpm. Also when i am going real slow and turn into a parking spot the car has just completely shut off. Same thing then i try to back into a spot when i shift from drive to reverse my lights will dim and the RPM's will drop.

I have cheked the IAC and MAf both have been cleaned, i have also tried a different IAC and there was no change.

I realized tonight that if im just sitting still can crank the wheel to either side the lights will dim and RPM's will drop. Could that be a battery issue? Am i drawing too much power from the battery and alternator for them to keep up. I am not running heat or AC when it happens. But i do have a few extra accessories wired in, like 3 gauges, 1 12' Sub, water pump for my FSIC and a dash cam.

Any thoughts would be appreciated

Thanks
Dan
 


What year GP? Dirty TB comes to mind. And when sitting still and turning the wheel it will put a strain on everything since you are at idle and are inducing more friction due to the tires not spinning as they would be when parking/driving. That's normal.
 
How old are your Cats? Plugged cat could do some of this.

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Running with check engine light on or do you have the o2 sensor tuned out? Apologies if cat delete is in sig can't see on tapatalk.

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01 up you need the cat test killed with the rear o2 and cat delete or it can over fuel as its running the dumb test over and over.
 
Thanks for the info Scotty, that is something i was not aware of. I just corrected that in my tune.

Now any other ideas on why the car will shut off randomly. Also ill add that on about 3 occasions in the past year i will start up the car and it will die instantly, it seems to be idleing too low. I can keep it running if i keep it reved up to 800rpm or above but it is not able to keep it there by itself. Then later that day it starts up an runs fine.
 
Almost sounds like a head/intake gasket issue except for the running fine later. When was the last time full tune up/ basic replaceables were done? I'm not a fan of throwing parts at a problem until it goes away but if it's around time for plugs/wires/filters/egr I tend to start there.

What output do you get from battery with car running? Same with car off. Did you have issues before installing the sub?

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All gaskets were redone 2 years ago when i did the top swap.(about 15k miles) I have had the sub in the car for about 6 years. EGR has been deleted, cleaned my air intake filter about 6 months ago, spark plugs were changed less then 1k miles ago. Looksl like im getting 12.7v when the car is off and 14.2v when the car is running.
 


I have the same issue, except my car is an 04 Comp G, Batterry Voltage drops between 11.5ish and 13.5ish when this pulsing is happening with the RPM drop and low voltage battery light "pings", but has never stalled on me. I do have a voltage booster on it (for warmer heated seats and faster defroster) but it has done it even with it not installed.
 
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