Idle control valve issue
- Thread starter jlilley65
- Start date
chris2523
93 Mark VIII
what codes?
what year?
what engine?
what symptoms?
etc etc.
what year?
what engine?
what symptoms?
etc etc.
Shoot I'm sorry I forgot that part.
02 3.9.
I don't have the code number off hand. I'll get it today with my sct.
The car starts really hard. It cranks forever before starting and then once it starts you have to stay on the throttle for a bit and slowly let it idle down. Then it'll idle like it has a big cam no matter when you start it. The code is just for my IAC. Coils and plugs replaced about 20k ago. I replaced the valve but it's still doing the same thing.
02 3.9.
I don't have the code number off hand. I'll get it today with my sct.
The car starts really hard. It cranks forever before starting and then once it starts you have to stay on the throttle for a bit and slowly let it idle down. Then it'll idle like it has a big cam no matter when you start it. The code is just for my IAC. Coils and plugs replaced about 20k ago. I replaced the valve but it's still doing the same thing.
chris2523
93 Mark VIII
thats weird. but the IAC won't do the big cam thing.
being a first gen V8, i wonder if you have a failed secondary tensioner, and one bank has jumped time.
if that's what happened, you should stop running the car immediately because further damage may result.
pulling the valve covers and looking at the tensioners may be a prudent choice.
being a first gen V8, i wonder if you have a failed secondary tensioner, and one bank has jumped time.
if that's what happened, you should stop running the car immediately because further damage may result.
pulling the valve covers and looking at the tensioners may be a prudent choice.
The thing that I find odd is that it drives down the road perfectly fine. It overloads on fuel at idle I can smell it. It smells like the cats are getting hot as well at idle. Very rich fuel smell when started. The mufflers have been off the car for 2 years now so that why it sounds like it has a cam at idle. I just removed them and put tips on the car.
1LoudLS
Dedicated LVC Member
huh, I wonder if you have a coil going out like most LSs... can definitely "overload on fuel" symptom, also a misfire at idle could throw off the idle like it had a huge cam...
interestingly enough, this problem also tends to not throw codes.
interestingly enough, this problem also tends to not throw codes.
joegr
Dedicated LVC Member
Please post exactly which five character OBDII code(s) you are getting. There are more than one related to the IAC, and they mean different things. None of them mean that the IAC itself is definitely bad. They only give you the starting point to do more troubleshooting tests before determining what needs to be replaced/fixed.