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2.5 Rougle Idle/Stall, Dimming Lights Etc...


tajvelocity

Well-Known Member
Joined
Sep 3, 2010
Messages
116
City
CinciTucky
Vehicle Year
1999
Transmission
Manual
99 B2500 (twin spark) 110K.

I got my truck back on the road but decided to park it until I get this figured out. It has been running poorly for over a year now. Symptoms include rough idle when stopped and often stalling when I put the clutch in at a red light. All the lights dim in relation to engine speed, so because the idle pulses, the lights do too. I would think that the dimming could be a bad alternator, but it’s brand new. The battery isn’t that old, but it has been dead a couple of times, once for more than a month while it sat. Plugs and plug wires are only a couple years old. Fuel filter is new. New O2 sensor (the upstream one I guess). I cleaned the MAF. I took out and shook the IAC and it rattled which I’ve read, means it’s fine. I think I can’t remember if I checked the EGR valve last fall but I think I did.

Does this sound like a vacuum leak? I’ve read of different ways to check like spraying starting fluid or carb cleaner on the hoses to see if the idle goes up. I haven’t been able to find a diagram showing where all the hoses are. My Haynes manual sucks sometimes. Could it be a bad fuel pump? After it sat for two months it wouldn’t start and I had a helluva time figuring that out, but one day it did start making me think that the battery was just really dead and needed to be charged up over night. I need to change (or have somebody change) the timing belt, but I don’t know if that would cause these problems. It used to throw a code (can’t remember which one, but “lean condition bank 1” I think) but the CEL is off now. This sucks.

Thanks for the help.
 
...also, when I bought the truck it had a small amp installed. I'm not sure if that would have anything to do with it or not. I also realize the dimming and the idle/stalling could be unrelated...but I hope not.
 
UPDATE:
5403554500_2e2fef5eb7_z.jpg

that guy up there went to...
5402966297_5f94079be3_z.jpg

...that thing right there. I sprayed some carb cleaner on some hoses and found the cracked hose. Taped it up and it helped. Got a new hose and put it on and the idle is MUCH smoother. Problem is, I'm not sure what that thing is. Help a fella out?
 

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