pscarbor
Junior Member
- Joined
- Dec 11, 2023
- Posts
- 21
- Reaction score
- 37
- Location
- Many, LA
- Ram Year
- 2004, 2006, 2009
- Engine
- 5.9, 5.7 Hemi, 5.7 Hemi
Hi guys, hope one of you can help me with a mystery (or two). I have a 2006 Ram 1500 5.7, high mileage (280k) that my wife bought off of Facebook for $2000. I've been working on it for about a year and it runs amazingly well (after I put $7500 worth of parts in it). I still have two issues which I think are related.
The truck has always idled too fast. Initially hot idle was around 900 RPM, no big deal; but as I went through the engine replacing stuff it started to run better but also idle higher. I've replaced the throttle body, EGR, PCV valve, ECT sensor, all four O2 sensors, spark plugs. The TP is Dorman; O2 sensors are NTG, plugs NGK, ECT is Standard. So far everything I replaced generally either made no difference of made the truck run generally better AND increased the idle RPM.
Idle RPM cold is now about 1000; hot it's 1300 and occasionally throws P0507 (idle too high) codes. I've tried to find vacuum leaks using the propane method and even sprayed water all over the intake manifold and vacuum hoses, blocked off the brake booster hose. There is no vacuum leak that I can find. Both upstream and downstream O2 sensors seem to be operating correctly.
The other issue, which may be related to the fast idle, is the dreaded "Dodge red lightning bolt of death". This started a couple of months ago and seems to only happen at idle or low RPM. When this goes off the fuel system goes into to closed loop mode, engine runs rough. Turn ignition off then back on and it's fine for a while again. No other codes are thrown when this happens.
Any help or suggestion will be greatly appreciated!
The truck has always idled too fast. Initially hot idle was around 900 RPM, no big deal; but as I went through the engine replacing stuff it started to run better but also idle higher. I've replaced the throttle body, EGR, PCV valve, ECT sensor, all four O2 sensors, spark plugs. The TP is Dorman; O2 sensors are NTG, plugs NGK, ECT is Standard. So far everything I replaced generally either made no difference of made the truck run generally better AND increased the idle RPM.
Idle RPM cold is now about 1000; hot it's 1300 and occasionally throws P0507 (idle too high) codes. I've tried to find vacuum leaks using the propane method and even sprayed water all over the intake manifold and vacuum hoses, blocked off the brake booster hose. There is no vacuum leak that I can find. Both upstream and downstream O2 sensors seem to be operating correctly.
The other issue, which may be related to the fast idle, is the dreaded "Dodge red lightning bolt of death". This started a couple of months ago and seems to only happen at idle or low RPM. When this goes off the fuel system goes into to closed loop mode, engine runs rough. Turn ignition off then back on and it's fine for a while again. No other codes are thrown when this happens.
Any help or suggestion will be greatly appreciated!
