5.8L bogging under acceleration/load
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5.8L bogging under acceleration/load
Alright, guys here is the situation.
Recently, I've been noticing that my truck ('95 F250 2WD 5.8L) is bogging below 3000RPM. It doesn't seem to have the same problem when in neutral, but it's possible I just don't "feel" it because I'm not moving.
Early on, if I switched from the rear tank to the front tank, it would get better (leading me to think it was a rear fuel pump issue) but not it is about the same on both tanks.
I've changed the fuel filter and the alternator (it needed to be replaced anyway, it was shredding belts) to no avail. Currently, I am getting these codes: 172, 332, and 543C.
Any advice?
Thanks all, I love this forum, you guys are the best!
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Daniel Jackson
Recently, I've been noticing that my truck ('95 F250 2WD 5.8L) is bogging below 3000RPM. It doesn't seem to have the same problem when in neutral, but it's possible I just don't "feel" it because I'm not moving.
Early on, if I switched from the rear tank to the front tank, it would get better (leading me to think it was a rear fuel pump issue) but not it is about the same on both tanks.
I've changed the fuel filter and the alternator (it needed to be replaced anyway, it was shredding belts) to no avail. Currently, I am getting these codes: 172, 332, and 543C.
Any advice?
Thanks all, I love this forum, you guys are the best!
-
Daniel Jackson
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Joined: Jun 2006
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From: Ottawa, Ontario
Codes 172 and 332 together is telling, 172 is a lean code and 332 is an EGR fault, if the EGR is opening when it's not supposed to the engine will run lean and misfire. Try disconnecting the vacuum line to the EGR and test drive, also look to see if there is any vacuum on the EGR line at idle, there should not be. If there is the EGR control solenoid is leaking vacuum or has an electrical fault.
Code 543 is common on trucks with dual tanks, switching tanks seems to set this code so it can be ignored IMO.
Code 543 is common on trucks with dual tanks, switching tanks seems to set this code so it can be ignored IMO.
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Removing that vacuum line seemed to help, but not completely. Honestly, it's hard to tell if it helped or if it was just wishful thinking. I'll test it again on my way home from work today.
Any other advice in the mean time?
Any other advice in the mean time?
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Check fuel pressure just to be sure, and remove and inspect the plugs for color. They should be tan brown, if they are all white this suggests a global lean problem which could be related to a malfunctioning EGR or air injection systems. Anything that sounds like an exhaust leak around the engine?
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Update time!
So, I finally had a chance to look into this some more. But I'm still not making a ton of headway. I bought a harbor freight (first mistake I suppose) fuel pressure gauge and hooked it up. However, it's only reading 10psi and doesn't move at all when I blip the throttle.
I still need to check the spark plugs but I wanted to update where I was in the meantime.
Any help is appreciated!
So, I finally had a chance to look into this some more. But I'm still not making a ton of headway. I bought a harbor freight (first mistake I suppose) fuel pressure gauge and hooked it up. However, it's only reading 10psi and doesn't move at all when I blip the throttle.
I still need to check the spark plugs but I wanted to update where I was in the meantime.
Any help is appreciated!
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I'm not sure if the old fuel filter was clogged or not, I ended up having to take it to a shop in town because I couldn't get one of the stupid fitments loose. If the fuel gauge I have tests correct, I guess it's time to drop the tank and see what I can find there... Yay... :-P
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Another thing you could possibly check is your o2 sensor. My f150 did what sounds like the same thing, bog down until about 3k rpm then it would take off. I also had a lean code but no o2 sensor code. A quick way to test it would be to unplug the o2 sensor that way the engine runs in open loop(or is it closed loop I always mix them up). This causes the engine to run on a predefined fuel map(rich). If that doesnt help then it is probably a fuel issue.
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Alrighty then,
So, it was failing fuel pumps. I replaced one and she came back to life!
I'll leave the other one for now and maybe put 5gal in just as an emergency backup. Maybe I'll replace it next spring.
Thanks to everyone for the input and help, but the biggest shoutout to Conanski for his help, you win the MVP award for this thread. If you're ever near Indianapolis, IN I'll buy you a beer.
So, it was failing fuel pumps. I replaced one and she came back to life!
I'll leave the other one for now and maybe put 5gal in just as an emergency backup. Maybe I'll replace it next spring.
Thanks to everyone for the input and help, but the biggest shoutout to Conanski for his help, you win the MVP award for this thread. If you're ever near Indianapolis, IN I'll buy you a beer.
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- Haha, down here in Bloomington with a 93 5.8 F350 and the same problem!
I just checked fuel pressure and it came to 30 key on with one prime, 28 at idle and a extreme drop down to 25 with throttle. With the vacuum off the FPR I got a steady 37.
Same results on both tanks.
Odd really.
I have a low power issue and a surging acceleration.
2nd Gear
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Exhaust leak?
Just curious in this question here, but why would you ask of an exhaust leak? Having the same issue as dajack05, but I also have an exhaust leak somewhere up in the engine bay or right behind the engine. But I'm doubting its actually an exhaust leak because in park I will rev it up to 3000 and not a peep but while driving its super obnoxious. I replaced my back fuel pump, and it still bogs and runs like **** up on the high end and at idle in drive but runs fine in park or neutral. I can also rev with no issues in park or idle. I have also replaced both the fuel and air filter on the truck and changed the spark plugs. Starting to think I might need to replace the throttle body since I have heard that if they get dirty, they can cause the rough running but besides that I'm stuck at a dead end here. Any thoughts?
This truck is a 1993 F150 with the 5.8 fuel injection.
This truck is a 1993 F150 with the 5.8 fuel injection.