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#1
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Error codes
I'm having a problem with my 93 5.0.. it starts and runs fine, but
around 3/4 throttle or more it noses over and dies.. backfires until you get off the gas. I just pulled the codes today.. I'm getting codes 18, 41, 91. I also ran the cylinder balance test and everything was fine there. My o2 sensors have about 6k miles on them so I'm going to go ahead and assume they are operating ok. As for code 18, is that specifically the spout connector or the TFI?? What do I need to replace on that one? As for 41, and 91 both indicate lean mixture and 91 a fuel pressure problem. I disconnected the vacuum line from the FPR and took it for a drive and it didn't change at all, so can I go ahead and assume that the pressure regulator is the faulty component or could it still be fuel pump/injector related even though it passed the cylinder balance test? |
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#2
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Error codes
I think thet you're misunderstanding some of this stuff.... and then you're
goig to compound the error with assumptions. DTC 18 can be set when a poorly maintained ignition system starts arcing and sparking under the hood. Since this makes us real familiar with misfires, we can deduce that these misfires are leaving a lot of oxygen free to go down the pipe to be read by the sensors and PCM as a lean mixture (DTCs 41 and 91). In 1993, engine control systems weren't smart enough to know if they were misfiring or not. DTCs are a symptom and not a flat "replace component X" statement. For your case, I would recommend a good basic ignition tune up including cap, rotor and wires with close attention being paid to the condition of the ignition coil. "LVDonkey" > wrote in message oups.com... > I'm having a problem with my 93 5.0.. it starts and runs fine, but > around 3/4 throttle or more it noses over and dies.. backfires until > you get off the gas. I just pulled the codes today.. I'm getting codes > 18, 41, 91. I also ran the cylinder balance test and everything was > fine there. > My o2 sensors have about 6k miles on them so I'm going to go ahead > and assume they are operating ok. As for code 18, is that specifically > the spout connector or the TFI?? What do I need to replace on that > one? > As for 41, and 91 both indicate lean mixture and 91 a fuel pressure > problem. I disconnected the vacuum line from the FPR and took it for a > drive and it didn't change at all, so can I go ahead and assume that > the pressure regulator is the faulty component or could it still be > fuel pump/injector related even though it passed the cylinder balance > test? > |
#3
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Error codes
Could it be a dirty fuel filter?
"Jim Warman" > wrote in message news:y%sqf.995$AP5.568@edtnps84... > I think thet you're misunderstanding some of this stuff.... and then you're > goig to compound the error with assumptions. > > DTC 18 can be set when a poorly maintained ignition system starts arcing and > sparking under the hood. Since this makes us real familiar with misfires, we > can deduce that these misfires are leaving a lot of oxygen free to go down > the pipe to be read by the sensors and PCM as a lean mixture (DTCs 41 and > 91). In 1993, engine control systems weren't smart enough to know if they > were misfiring or not. > > DTCs are a symptom and not a flat "replace component X" statement. > > For your case, I would recommend a good basic ignition tune up including > cap, rotor and wires with close attention being paid to the condition of the > ignition coil. > > > "LVDonkey" > wrote in message > oups.com... > > I'm having a problem with my 93 5.0.. it starts and runs fine, but > > around 3/4 throttle or more it noses over and dies.. backfires until > > you get off the gas. I just pulled the codes today.. I'm getting codes > > 18, 41, 91. I also ran the cylinder balance test and everything was > > fine there. > > My o2 sensors have about 6k miles on them so I'm going to go ahead > > and assume they are operating ok. As for code 18, is that specifically > > the spout connector or the TFI?? What do I need to replace on that > > one? > > As for 41, and 91 both indicate lean mixture and 91 a fuel pressure > > problem. I disconnected the vacuum line from the FPR and took it for a > > drive and it didn't change at all, so can I go ahead and assume that > > the pressure regulator is the faulty component or could it still be > > fuel pump/injector related even though it passed the cylinder balance > > test? > > > > |
#4
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Error codes
I initially thought it was the coil too, which I replaced a week ago,
the plugs and wires and cap and rotor were all replaced about 2 weeks before that, the fuel filter has not however, I guess I will also try that this weekend when I have some free time. The car has been sitting for a while due to this problem and I just remembered now how this all started, I had 2 plug wire looms break and 2 plug wires ended up on the headers and burned through, which obviously caused misfiring however when I replaced the wires it didn't go away which is when I replaced basically the whole ignition system. Also this problem is much worse at cold startup.. basically any throttle makes it want to die, I have to wait till my A/F gauge starts bouncing around before pulling out of my parking spot. |
#5
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Error codes
How was it running before you replace the all those parts?
"LVDonkey" > wrote in message ups.com... > I initially thought it was the coil too, which I replaced a week ago, > the plugs and wires and cap and rotor were all replaced about 2 weeks > before that, the fuel filter has not however, I guess I will also try > that this weekend when I have some free time. The car has been sitting > for a while due to this problem and I just remembered now how this all > started, I had 2 plug wire looms break and 2 plug wires ended up on the > headers and burned through, which obviously caused misfiring however > when I replaced the wires it didn't go away which is when I replaced > basically the whole ignition system. Also this problem is much worse > at cold startup.. basically any throttle makes it want to die, I have > to wait till my A/F gauge starts bouncing around before pulling out of > my parking spot. > |
#6
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Error codes
It ran great before the plug wire incident, after that happened is when
I started replacing the ignition parts. Ironrod wrote: > How was it running before you replace the all those parts? > > > "LVDonkey" > wrote in message > ups.com... > > I initially thought it was the coil too, which I replaced a week ago, > > the plugs and wires and cap and rotor were all replaced about 2 weeks > > before that, the fuel filter has not however, I guess I will also try > > that this weekend when I have some free time. The car has been sitting > > for a while due to this problem and I just remembered now how this all > > started, I had 2 plug wire looms break and 2 plug wires ended up on the > > headers and burned through, which obviously caused misfiring however > > when I replaced the wires it didn't go away which is when I replaced > > basically the whole ignition system. Also this problem is much worse > > at cold startup.. basically any throttle makes it want to die, I have > > to wait till my A/F gauge starts bouncing around before pulling out of > > my parking spot. > > |
#7
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Error codes
You're going to have to go into more detail about the plug wire incident.
If the car was running decent before you started replacing stuff, try putting the old parts back on and see it the problems clear. "LVDonkey" > wrote in message oups.com... > It ran great before the plug wire incident, after that happened is when > I started replacing the ignition parts. > > > Ironrod wrote: > > How was it running before you replace the all those parts? > > > > > > "LVDonkey" > wrote in message > > ups.com... > > > I initially thought it was the coil too, which I replaced a week ago, > > > the plugs and wires and cap and rotor were all replaced about 2 weeks > > > before that, the fuel filter has not however, I guess I will also try > > > that this weekend when I have some free time. The car has been sitting > > > for a while due to this problem and I just remembered now how this all > > > started, I had 2 plug wire looms break and 2 plug wires ended up on the > > > headers and burned through, which obviously caused misfiring however > > > when I replaced the wires it didn't go away which is when I replaced > > > basically the whole ignition system. Also this problem is much worse > > > at cold startup.. basically any throttle makes it want to die, I have > > > to wait till my A/F gauge starts bouncing around before pulling out of > > > my parking spot. > > > > |
#8
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Error codes
Info in dribs and drabs is good..... The plug wire incident is when the
wires burned through on the headers? Are the wires assigned correctly for the fring order? |
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