03 EB bad injector?
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03 EB bad injector?
I have an 03 EB with a 4.6. My wife was driving home and called me because she said it was running really bad and it smelled like gas. It ended up dying on her so I went to investigate. When I got there I cranked it and it started but acted hesitant. I drove it home and heres what I have:
Runs really bad at idle but runs better at higher rpm
white smoke coming from exhaust due to unburnt fuel
pulled codes 206 (cylinder 6 injector circuit open), 306 (cylinder 6 misfire),
and one for oxy sensor rich
Heres what I've tried:
Ran ohms resistance test on #6 injector, 17 (normal range 13.5-19)
Tried noid light, with KOEO, the light stays on. Put noid light on other injectors and they dont light up when key is on.
Noid light remains on even when cranking on #6 unlike others that flash when cranking or running.
At first I thought the injector was bad but after trying the noid light, it seems for some reason something is making the #6 injector stay open. What would cause this?
Runs really bad at idle but runs better at higher rpm
white smoke coming from exhaust due to unburnt fuel
pulled codes 206 (cylinder 6 injector circuit open), 306 (cylinder 6 misfire),
and one for oxy sensor rich
Heres what I've tried:
Ran ohms resistance test on #6 injector, 17 (normal range 13.5-19)
Tried noid light, with KOEO, the light stays on. Put noid light on other injectors and they dont light up when key is on.
Noid light remains on even when cranking on #6 unlike others that flash when cranking or running.
At first I thought the injector was bad but after trying the noid light, it seems for some reason something is making the #6 injector stay open. What would cause this?
Logistics Pro
Joined: Jan 2001
Posts: 3,740
Likes: 37
From: Central NYS
Tried noid light, with KOEO, the light stays on. Put noid light on other injectors and they dont light up when key is on.
Noid light remains on even when cranking on #6 unlike others that flash when cranking or running.
At first I thought the injector was bad but after trying the noid light, it seems for some reason something is making the #6 injector stay open. What would cause this?
Noid light remains on even when cranking on #6 unlike others that flash when cranking or running.
At first I thought the injector was bad but after trying the noid light, it seems for some reason something is making the #6 injector stay open. What would cause this?
My SWAG is that the Green w/orange stripe wire of injector #6 has found its own way to ground. (In other words, when the PCM releases its ground for injector #6, the Green w/Orange stripe wire provides its own ground and keeps the injector (and NOID light) on.
Unplug the injector #6 from the vehicle wiring harness and unplug the 104-pin connector from the PCM. That should isolate the green w/orange stripe wire. Then put your ohm meter on the green w/orange stripe wire and the other meter lead to a good ground. If the meter shows continuity, that green w/orange stripe wire has found a path to ground.
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Doesn't seem to have a break anywhere. Found green w/Orange stripe wire on pcm side, not getting continuity through it and engine frame. Even checked pcm side with injector side, no resistantance. Any other ideas???
Fleet Owner
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1. It's possible you got ahold of the wrong wire. It should be the 6th one in on the bottom row of the PCM connector.
2. Do you have an aftermarket remote starter where the installer might've tied into the #6 injector circuit for a tach pulse?
A second access point for the injector wiring is under that metal plate below the starter relay on the passenger side of the firewall. There you will find two large, basically square, connectors. Also, it might be a light green wire with an orange tracer instead of a darker green with orange.
2. Do you have an aftermarket remote starter where the installer might've tied into the #6 injector circuit for a tach pulse?
A second access point for the injector wiring is under that metal plate below the starter relay on the passenger side of the firewall. There you will find two large, basically square, connectors. Also, it might be a light green wire with an orange tracer instead of a darker green with orange.
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Freshman User
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1. It's possible you got ahold of the wrong wire. It should be the 6th one in on the bottom row of the PCM connector.
2. Do you have an aftermarket remote starter where the installer might've tied into the #6 injector circuit for a tach pulse?
A second access point for the injector wiring is under that metal plate below the starter relay on the passenger side of the firewall. There you will find two large, basically square, connectors. Also, it might be a light green wire with an orange tracer instead of a darker green with orange.
2. Do you have an aftermarket remote starter where the installer might've tied into the #6 injector circuit for a tach pulse?
A second access point for the injector wiring is under that metal plate below the starter relay on the passenger side of the firewall. There you will find two large, basically square, connectors. Also, it might be a light green wire with an orange tracer instead of a darker green with orange.
No aftermarket remote start.
pdqford: I thought the noid light staying on eliminated the injector being bad?
Logistics Pro
Joined: Jan 2001
Posts: 3,740
Likes: 37
From: Central NYS
Ask alloro if the #6 injector driver in the PCM could be bad..........I don't know how to prove that out.
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Fleet Owner
Joined: Apr 2008
Posts: 24,324
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From: 0,0,1
Negative. The injector can be internally shorting the pulsed side to ground. Did you try testing for ohms from each of the two injector pins to ground, with the 2-wire connector disconnected.
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Wish I would read this earlier. Turned it over to the dealership. Seems to be over my head. I'm used to working on Ford OBD I. Will post when dealer calls tomorrow. Thanks guys.
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