Unexpected reaction after gutting air box (back in the hunt)
#1
Senior Member
Posts like a Northstar
Thread Starter
Join Date: Jan 2006
Location: Valley Forge, PA
Posts: 598
Likes: 0
Received 0 Likes
on
0 Posts
Unexpected reaction after gutting air box (back in the hunt)
After i gutted the back box in the SSEI, the car isn't running the same. At stop and idle, the boost gage reads up a couple of points and there'* a slight vibration in the steering wheel. Before it would read -10 and the wheel was dead still. It seems like the engine is asking for more air, like it'* choking a bit. This not what has happened before. Usually the car almost immediately gets smoother.
I had the battery disconnected, reconnected it and have driven about 30 miles. Also when I sit it at idle the coolant temperature goes up. It never did that before either. It stayed pegged at 195+/- no matter how i long i let it set idling.
The only thing i could think of is that missed some loose plastic in the box and it'* on the MAF screen now.
What could be up?
I had the battery disconnected, reconnected it and have driven about 30 miles. Also when I sit it at idle the coolant temperature goes up. It never did that before either. It stayed pegged at 195+/- no matter how i long i let it set idling.
The only thing i could think of is that missed some loose plastic in the box and it'* on the MAF screen now.
What could be up?
#3
Senior Member
Posts like a Northstar
Thread Starter
Join Date: Jan 2006
Location: Valley Forge, PA
Posts: 598
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by willwren
Inspect your MAF screen, then put it all back and give it some time to re-learn how to idle.
#5
Senior Member
Posts like a Northstar
Thread Starter
Join Date: Jan 2006
Location: Valley Forge, PA
Posts: 598
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by BillBoost37
While it'* out..also check all the vacuum lines in the area under the airbox and at the throttle body. Ensure the IAT is plugged in.
edit: i know, I'll swap in a spare back box i have. if it goes back to normal, then the MAF isn't clogged.
#6
Senior Member
Posts like a Northstar
Thread Starter
Join Date: Jan 2006
Location: Valley Forge, PA
Posts: 598
Likes: 0
Received 0 Likes
on
0 Posts
Normal amount of air, it barely does it. I just swapped in the stock box, without disconnecting the battery. It could be re-relearning. How long does it take for relearning idle?
It'* easily has 2 or 3 times the air available with the gutted box. the throttle just loves it. I took it out on some familiar hills and there was definitely some more power.
I still can't figure why more air during idle, would make the car behave like it'* choking for air.It is idling at the right speed, but the SC has to work to do it.
It'* easily has 2 or 3 times the air available with the gutted box. the throttle just loves it. I took it out on some familiar hills and there was definitely some more power.
I still can't figure why more air during idle, would make the car behave like it'* choking for air.It is idling at the right speed, but the SC has to work to do it.
#7
DINOSAURUS BOOSTUS
Expert Gearhead
The maf screen is in correct?
Maf is clean?
Your symptoms seem vacuum related, the boost gauge is a vacuum/positive pressure gauge. No need to hook up the scanner, visual inspection of the vacuum lines is needed.
Maf is clean?
Your symptoms seem vacuum related, the boost gauge is a vacuum/positive pressure gauge. No need to hook up the scanner, visual inspection of the vacuum lines is needed.
#8
Senior Member
Posts like a Northstar
Thread Starter
Join Date: Jan 2006
Location: Valley Forge, PA
Posts: 598
Likes: 0
Received 0 Likes
on
0 Posts
Yeah. I figured it'* working harder to pull the air in. I changed the plugs and wires yesterday and I'm waiting for the O2sensor and PCV. The TB and MAF were going to be next antway. I'll drive it 'till the parts get here tomorrow or the next day. See if it settles any. I just have a feeling I missed something when I scrubbed out the box and it whiffed onto the MAF.
Thanks for the help..
Thanks for the help..
#10
Senior Member
Posts like a Northstar
Thread Starter
Join Date: Jan 2006
Location: Valley Forge, PA
Posts: 598
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by BillBoost37
Charlie.. would you please check the vacuum lines?
Just a BTW... I know that this might sound neo-stupid..... The front bank O2 sensor is really "slow". It'* definitely not Delco, which I always use. The one on my '95 is like lightning. The one on the SSEI seems like it has to think for a second, then shift.
This a good problem-solve for me to go through.