gavin
Explorer Addict
- Joined
- September 27, 2002
- Messages
- 3,183
- Reaction score
- 23
- City, State
- Anchorage, Alaska
- Year, Model & Trim Level
- '97 Explorer XLT AWD 5.0L
Today started out like any other work-day.
Truck was running fine this morning.
Like every Wednesday, I head on over to a remote site. Truck runs fine on the way there, and the way back to the office.
Of course the way my luck is, when I go leave to head home for lunch, it starts idling horribly.
Now, I'm not sure if I heard any odd noises or not at initial start-up, but now I'm hearing what almost sounds like a hiss. Now, this hiss does change with a change in RPMs.
Idle is high. Around 1200 I would wager. Also, when shifting from D to N, it jumps up to 2000 RPM for about 5 seconds or so before it slowly drops back down to 1200.
When stopped in D, it's a rough idle.
Now, when I disconnect the MAF, idle is good. A bit high, but good.
While at home on lunch, I cleaned the MAF and unplugged the PCM for a bit. No change.
I have an aftermarket Granatelli MAF on, so I swapped in my OEM. No change.
Also, shifting feels.... strange. It seems to shift at odd times compared to the "usual"
I'm guessing IAC, TPS, or possibly vacuum leak? Although vacuum leak wouldn't be likely if the hiss noise does not change with a change in RPMs, correct?
This would be on my '97 5.0.
Truck was running fine this morning.
Like every Wednesday, I head on over to a remote site. Truck runs fine on the way there, and the way back to the office.
Of course the way my luck is, when I go leave to head home for lunch, it starts idling horribly.
Now, I'm not sure if I heard any odd noises or not at initial start-up, but now I'm hearing what almost sounds like a hiss. Now, this hiss does change with a change in RPMs.
Idle is high. Around 1200 I would wager. Also, when shifting from D to N, it jumps up to 2000 RPM for about 5 seconds or so before it slowly drops back down to 1200.
When stopped in D, it's a rough idle.
Now, when I disconnect the MAF, idle is good. A bit high, but good.
While at home on lunch, I cleaned the MAF and unplugged the PCM for a bit. No change.
I have an aftermarket Granatelli MAF on, so I swapped in my OEM. No change.
Also, shifting feels.... strange. It seems to shift at odd times compared to the "usual"
I'm guessing IAC, TPS, or possibly vacuum leak? Although vacuum leak wouldn't be likely if the hiss noise does not change with a change in RPMs, correct?
This would be on my '97 5.0.