fastpakr
Well-Known Member
- Joined
- February 18, 2005
- Messages
- 703
- Reaction score
- 171
- City, State
- Roanoke, VA
- Year, Model & Trim Level
- 99 4wd - 5.0/4R70W/BW4406
Now that the (2nd) rebuilt 5.0 is in the truck (my '99 Ranger) and everything is connected, I was excited to fire it up again last week. Unfortunately, it idles like hot garbage and I'm struggling to nail down what's going on. If anybody wants to help solve the puzzle, here's what I know:
It's a '99 Explorer with GT40P heads and headers running the entire stock wiring harness, emissions components, etc
Roller rockers (stock 1.6 ratio)
Cam (comp XE258HR-12) (info here) is pretty mild, with springs installed to match it.
Very rough idle, tends to shut off when putting in gear. Will not restart without applying accelerator halfway (but starts cold with no throttle input).
Idles at ~10" of vacuum. Power brake assist is negligible.
Tested with booster disconnected, no change in vacuum measurement.
Shuts off immediately if IAC is disconnected.
No codes are being set.
No apparent impact from spraying starter fluid around any accessible vacuum connection (front and rear trees on drivers side, power brake booster, upper to lower joint, etc).
Using a smoke machine to detect vacuum leaks didn't demonstrate any.
The fuel is about two years old. I'm looking for a 5 gallon can so I can transfer a few gallons at a time into another vehicle and run it in that, then refill with fresh fuel.
I'd love to hear suggestions on what I might be missing.
It's a '99 Explorer with GT40P heads and headers running the entire stock wiring harness, emissions components, etc
Roller rockers (stock 1.6 ratio)
Cam (comp XE258HR-12) (info here) is pretty mild, with springs installed to match it.
Very rough idle, tends to shut off when putting in gear. Will not restart without applying accelerator halfway (but starts cold with no throttle input).
Idles at ~10" of vacuum. Power brake assist is negligible.
Tested with booster disconnected, no change in vacuum measurement.
Shuts off immediately if IAC is disconnected.
No codes are being set.
No apparent impact from spraying starter fluid around any accessible vacuum connection (front and rear trees on drivers side, power brake booster, upper to lower joint, etc).
Using a smoke machine to detect vacuum leaks didn't demonstrate any.
The fuel is about two years old. I'm looking for a 5 gallon can so I can transfer a few gallons at a time into another vehicle and run it in that, then refill with fresh fuel.
I'd love to hear suggestions on what I might be missing.