- Joined
- Sep 7, 2021
- Messages
- 132
- Reaction score
- 55
- Points
- 28
- Location
- Boise ID/Camarillo CA
- Vehicle Year
- 1986
- Make / Model
- Ford Ranger
- Engine Type
- 2.9 V6
- Transmission
- Manual
- 2WD / 4WD
- 4WD
- Total Lift
- 3"
- Tire Size
- 31x10.50R15
I'm almost ready to torch this truck.
Quick background:
Bought the truck about a month ago, engine ran great, just needed valve cover gaskets, new fluids, thermostat, and hoses (already had all new cap, rotor, plugs, and wires).
We also spent a night with some degreaser and washed 30 years (and probably 15 pounds of gunk) away
Symptoms
-Right after we pressure washed the bottom and did the passenger side valve cover gasket, it does not want to idle cold and generally does not run very well. It is a chore to start. I really have to feather the throttle to keep it running when cold. Once it is warm, it idles fine but if you goose the throttle, it bogs (cold or hot). It's like a delayed throttle. KOEO yields no codes. KOER yields a 25 (if I tap on the block while KOER is running, 25 goes away) and a 41. Vacuum looks good.
Video with Vacuum gauge, showing the bog
What I've done:
I ordered a new O2 sensor because it was cheap but I do not think this is the problem. If it was the O2 sensor, wouldn't it run fine when cold/open loop?
I also rebuilt ALLLlllll my EFI related grounds. They all come together at a bus bar next to my battery, now. The grounds are great. At least I think this is all my EFI grounds.
If I unplug my fuel pressure regulator it runs WORSE. When it is idling, if I put vacuum on the EGR port, the engine stumbles and runs like crap (as it should). When I unplug my IAC valve, engine immediately stalls. I do not hear any exhaust leaks upstream of the O2 sensor. I have a spare new MAP sensor and swapping it does not change the symptoms at all.
Thoughts?
Quick background:
Bought the truck about a month ago, engine ran great, just needed valve cover gaskets, new fluids, thermostat, and hoses (already had all new cap, rotor, plugs, and wires).
We also spent a night with some degreaser and washed 30 years (and probably 15 pounds of gunk) away
Symptoms
-Right after we pressure washed the bottom and did the passenger side valve cover gasket, it does not want to idle cold and generally does not run very well. It is a chore to start. I really have to feather the throttle to keep it running when cold. Once it is warm, it idles fine but if you goose the throttle, it bogs (cold or hot). It's like a delayed throttle. KOEO yields no codes. KOER yields a 25 (if I tap on the block while KOER is running, 25 goes away) and a 41. Vacuum looks good.
Video with Vacuum gauge, showing the bog
What I've done:
I ordered a new O2 sensor because it was cheap but I do not think this is the problem. If it was the O2 sensor, wouldn't it run fine when cold/open loop?
I also rebuilt ALLLlllll my EFI related grounds. They all come together at a bus bar next to my battery, now. The grounds are great. At least I think this is all my EFI grounds.
If I unplug my fuel pressure regulator it runs WORSE. When it is idling, if I put vacuum on the EGR port, the engine stumbles and runs like crap (as it should). When I unplug my IAC valve, engine immediately stalls. I do not hear any exhaust leaks upstream of the O2 sensor. I have a spare new MAP sensor and swapping it does not change the symptoms at all.
Thoughts?