Witchy_Libra_33
New Member
Hi guys! I'll try to keep this post short, but I want to make sure I cover everything that's happening with my Expy.
Ok so I have a 1999 Expy 5.4L triton v8 with around 260,*** miles on it. Had it almost a year now, and everything has been smooth sailing until about a month or so ago. The start to everything was when my husband was under the hood trying to check the spark plugs. While in the process of doing this, one of the connectors from the heater core hose assembly broke as he was simply trying to move them aside so he could get to the spark plugs on the left side of the engine (plugs 1-4), which wasn't a hard fix, just bought new hoses and replaced broken parts, but he never got to check the spark plugs. Now here's where the nightmare begins. After fixing the hoses, the Expy started idling a lot rougher than usual and while driving, it would start shaking/vibrating pretty badly between 40-50mph but would stop at lower or higher speed than that. Along with that, the SES light came on (and has yet to go off) and the oil pressure gauge started going haywire. The low oil pressure light would come on and the gauge would drop to the low side of gauge for about a minute or so and then return to normal for a few minutes and then drop down past the low side and back to normal over and over, and now the light stays illuminated and it's reading below the low side of gauge. A friend suggested to get an oil & filter change, which was done with no problem. Thought that might have been the issue seeing as the Expy started running noticeably smoother with very little shaking/vibrating noticed, but still present. Borrowed an OBD II scan tool from a family member, hooked it up to our car and it gave these codes:
P1400 DPFE Circuit Low Input
P0308 Cylinder #8 Misfire
So naturally the first thing checked were the spark plugs. This was done about 2 days after the oil change. Bought all 8 new plugs and had them changed (#8 was absolutely horrific looking, so it's safe to say that was overdue!). Took it for a test drive only to find the vibration from before had returned, but much worse, along with loss of power on acceleration and revving up past 3000rmps before shifting. At this point we are getting frustrated as to what's going on, so we again plug in the OBD II scan tool and this time it spit out the following codes:
P1400 DPFE Circuit Low Input
P0171 System Too Lean (Bank 1)
P0174 System Too Lean (Bank 2)
P0303 Cylinder #3 Misfire
P0307 Cylinder #7 Misfire
P0308 Cylinder #8 Misfire
P0113 Intake Air Temperature Sensor 1 Circuit Low
Double checked all spark plugs and discovered the boot from coil pack for #7 was shot and needed to be replaced. Ok, no problem, bought and replaced. After which, the SES light went off for first time since it lit up. Did a test drive to town and back, maybe a total of 10 miles round trip. Expy was running smooth with very minimal vibrations, but by the time we got home, the SES light was lit up again so we went ahead and plugged in the OBD II scan tool for a third time and it's still spitting out P1400, P0171, P0303 and P0307. For reference, the plugs and oil change were all done within the last week and a half, so it's a current ongoing issue that we can't for the life of us figure out what the exact problem is or what needs to be done to actually fix said problem. Is anyone has ANY advice or can point me in the right direction or knows what the deal is and can tell me how to fix it, that would be awesome and I'd really really appreciate it because it's becoming such a headache, I'm ready to roll this thing off a cliff!! Please help!! Thank you so much in advance!!
Ok so I have a 1999 Expy 5.4L triton v8 with around 260,*** miles on it. Had it almost a year now, and everything has been smooth sailing until about a month or so ago. The start to everything was when my husband was under the hood trying to check the spark plugs. While in the process of doing this, one of the connectors from the heater core hose assembly broke as he was simply trying to move them aside so he could get to the spark plugs on the left side of the engine (plugs 1-4), which wasn't a hard fix, just bought new hoses and replaced broken parts, but he never got to check the spark plugs. Now here's where the nightmare begins. After fixing the hoses, the Expy started idling a lot rougher than usual and while driving, it would start shaking/vibrating pretty badly between 40-50mph but would stop at lower or higher speed than that. Along with that, the SES light came on (and has yet to go off) and the oil pressure gauge started going haywire. The low oil pressure light would come on and the gauge would drop to the low side of gauge for about a minute or so and then return to normal for a few minutes and then drop down past the low side and back to normal over and over, and now the light stays illuminated and it's reading below the low side of gauge. A friend suggested to get an oil & filter change, which was done with no problem. Thought that might have been the issue seeing as the Expy started running noticeably smoother with very little shaking/vibrating noticed, but still present. Borrowed an OBD II scan tool from a family member, hooked it up to our car and it gave these codes:
P1400 DPFE Circuit Low Input
P0308 Cylinder #8 Misfire
So naturally the first thing checked were the spark plugs. This was done about 2 days after the oil change. Bought all 8 new plugs and had them changed (#8 was absolutely horrific looking, so it's safe to say that was overdue!). Took it for a test drive only to find the vibration from before had returned, but much worse, along with loss of power on acceleration and revving up past 3000rmps before shifting. At this point we are getting frustrated as to what's going on, so we again plug in the OBD II scan tool and this time it spit out the following codes:
P1400 DPFE Circuit Low Input
P0171 System Too Lean (Bank 1)
P0174 System Too Lean (Bank 2)
P0303 Cylinder #3 Misfire
P0307 Cylinder #7 Misfire
P0308 Cylinder #8 Misfire
P0113 Intake Air Temperature Sensor 1 Circuit Low
Double checked all spark plugs and discovered the boot from coil pack for #7 was shot and needed to be replaced. Ok, no problem, bought and replaced. After which, the SES light went off for first time since it lit up. Did a test drive to town and back, maybe a total of 10 miles round trip. Expy was running smooth with very minimal vibrations, but by the time we got home, the SES light was lit up again so we went ahead and plugged in the OBD II scan tool for a third time and it's still spitting out P1400, P0171, P0303 and P0307. For reference, the plugs and oil change were all done within the last week and a half, so it's a current ongoing issue that we can't for the life of us figure out what the exact problem is or what needs to be done to actually fix said problem. Is anyone has ANY advice or can point me in the right direction or knows what the deal is and can tell me how to fix it, that would be awesome and I'd really really appreciate it because it's becoming such a headache, I'm ready to roll this thing off a cliff!! Please help!! Thank you so much in advance!!