Help with Idle - SRT Forums

Adam030201 · 11-05-2009, 06:28 PM

My car is basically stock with a 3" AGP intake. Today i put in iridium NGK spark plugs gapped to .045 and a new MSD coil pack. When i drive and go to slow down the rpms hold at 1.5-2k until i am completely stopped, like the car is still getting throttle. What could cause this? It wasnt happening before the spark plugs and coil pack. I am not getting a check engine light

l2pdrums · 11-05-2009, 06:36 PM

What if you take out the coil pack and leave the spark plugs in. I've heard bad things on the MSD coil pack.

HWY* · 11-05-2009, 06:36 PM

Check your vac lines especially the one's around your TB. If all seems gtg, TPS (throttle position sensor)

Adam030201 · 11-05-2009, 06:54 PM

l2 you mean for me to put the stock coil pack back in? sorry im a car noob lol.

HWY would i make sense for it to be the throttle position sensor when it was just fine before I did these 2 things? Again, i dont know if that would effect it or not.

Thank you both for the quick responses

HWY* · 11-05-2009, 07:03 PM

Quote: Originally Posted by Adam030201

HWY would i make sense for it to be the throttle position sensor when it was just fine before I did these 2 things? Again, i dont know if that would effect it or not.

I don't see how a coil will create a hanging idle. It's worth a try tho, to swap your stocker back in.

High Rev at idle

Things are not always related. There are such things as coincidences.

There are many nay-sayers on the MSD coil subject. I, for one, have had a MSD for like 2 years w/ no issues.

HIERGLYPHICS3030 · 11-06-2009, 12:45 PM

i had this happen to me 2 times when the big ass vac line in the back of the manifold came off and when my brake booster came off

Adam030201 · 11-06-2009, 05:18 PM

i'm sorry but where is the brake booster and what is it?

HWY* · 11-06-2009, 05:22 PM

Quote: Originally Posted by Adam030201

i'm sorry but where is the brake booster and what is it?

It's the big black hose underneath the IM. If this popped off you would have no brakes.

Adam030201 · 11-08-2009, 11:08 AM

hmmm well i changed those mods back out with no changes so apparently it was just a coincidence and it might be the TPS. Thanks for the help guys, i guess ill try to get a TPS and see what happens