Hughes Airgap causing issues
Professional
Joined: Mar 2013
Posts: 221
Likes: 0
From: Nj
A long shot but when I installed my air gap the rear right mounting bolt hole that attaches the face plate to the intake was stripped so it was taking in extra air and as soon as i redrilled the hole. The revving stopped. Might want to check if its loose.
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Captain
Joined: Feb 2013
Posts: 532
Likes: 1
From: Central Washington
Status update: Saturday evening I kept doing some work to it. Replaced the IAC sensor with a new one. I had it laying around, I think I had plans to replace it at one point then forgot I had it. No change. I then unplugged the O2 sensor and took it for a drive...after about ten minutes with no issues, i stopped and plugged the sensor back in. Logic would say that if the sensor was the issue, plugging it back in would cause the issue to return. No such luck. The one time I wanted it to act up (as I would have successfully pinned the problem on the O2) it drove normal. for awhile anyways. After about 30 minutes of driving, with all sorts of varied conditions, full throttle, freeway, stop and go etc, the issue randomly returned. Got back to the house, unplugged the sensor again. This time, I reset the computer by touching the battery cables together. Hooked them back up, and took it on the same loop I had just used. I got back to the house with no issues, so I took it a little farther. Still no issues. Drove it Sunday morning to work and back, and again today without a recurring issue, all the while not having the O2 plugged in. I still am hesitant to call it a success as I have a skepticism based on countless disappointments so far. I will be replacing the sensor as soon as I can get one ordered regardless.
Veteran
Joined: Dec 2012
Posts: 487
Likes: 1
From: Evans City, PA
Yep, upstream O2 sensor is the likely culprit here...I had a similar issue with my truck back in the early summer that was caused by the same sensor. They can be hell to get out of that pipe tho, especially if its the factory sensor and you live in the north
All Star
Joined: Jan 2009
Posts: 907
Likes: 2
From: Corrales, New Mecico
So the issue has returned. Not sure where to go from here. I think its an elusive vacuum leak. It acts like its starving for fuel and tries to die, then the motor tries to over compensate, then triedsto die again, repeatedly until i get back on the throttle. It doesnt have to be much, just ease into it and it pulls out of it with a rough lurch. I dont understand how it runs so smooth with even the slightest throttle. It makes me consider the TPS or IAC sensors being a possible issue.
My big fear is that I botched the seal at the front and rear of the intake where those thick rubber gaskets are "supposed' to go (i didnt use them) and I will basically need to pull the intake and start over. So what works well to fill in that gap?
My big fear is that I botched the seal at the front and rear of the intake where those thick rubber gaskets are "supposed' to go (i didnt use them) and I will basically need to pull the intake and start over. So what works well to fill in that gap?
Stick a shop vac on the air breather hole in the valve cover, make sure it's flat and not leaking (four hands needed) and spray some water along the front and rear of the intake, if it's leaking you'll see the water disappear, if it is...Pull what ever accessory (Alternator/AC etc) you need to get a clear shot at it and clean it with brake cleaner, really clean it...Spray it in and vacuum it through the seam over and over...Finally run a bead of RTV where you saw it leaking (sucking up the water) and stick the vacuum over the hole in valve cover, it will suck the RTV into the crack...Let it dry and do it a few times till you can't see the RTV being sucked it.
It's saved my day a couple of times.