- This topic has 4 replies, 3 voices, and was last updated 11 years, 11 months ago by
.
-
Topic
-
yay.. i finally get to work on my own car banana:
2003 Ford Crown Vic CVPI 4.6L V8 (W engine) 85,000 miles
got a pretty hard check engine light this morning on the way to school… blinking CEL which eventually went solid. Just pulled the codes and this is what I got:
PCM
- P1000 [see attachment from alldata]
- P0457 replaced gas cap
- P0306 (i believe this is the culprit)
VAPS
- B1318 Low Batt voltage: I run a power inverter w/ lots of accessories, batt load test is good
- C1445 vehicle speed signal circuit failure – ABS module
[li]U1026 SCP data fault for engine RPM…?? (definition not found in alldata)
I believe the cause of the shuddering and subsequent CEL this morning is a result of #6 misfiring. As a quick test, I have already listened to the injectors and they all sound good, thus eliminating the need for any further fuel system diagnostics. I’m about to do a power balance (hopefully without shocking myself) and see if there is a noticible difference. Then I will pull and test the coil and remove the spark plug for inspection.
Pertinant History:
Just got back from a pretty serious road trip, probably put 1,500 miles on the vehicle over a 3 week period.
-
Replies
-
1500 miles in 3 weeks is normal for me lol.
I’ve heard that the coil-on-plugs commonly go bad on those engines. Might be a good place to start.
I’m not sure if this link will be accessible to ya’ll, but here is one serious TSB for these coils:
TSB 05-22-8
11/14/05
WDS COP KIT DIAGNOSTIC TIPS – COIL ON PLUG
(COP) IGNITION SYSTEMS – ENGINE MISFIRE OR
ROUGH RUNNINGWow… no resistance data for the coil. No problem, I will compare the resistance of the #6 coil to a neighboring known good working coil. 🙂
From AllData:
Ford does not provide standalone testing or resistance specifications for this component, the only test provided by Ford for the Ignition Coil is a pinpoint test procedure. For diagnosis and testing of the ignition coil, refer to “Powertrain Management : Computers and Control Systems : Testing and Inspection” See: Computers and Control SystemsTesting and Inspection
Known Good Resistance (#5 coil)
Suspect #6 coil
Car ran great after disconnecting #6 coil… gunned it to 3 or 4k rpm and the engine ran relatively smooth. Plugged #6 back up and it was chuggin’.
firewall
4 – 8
3 – 7
2 – 6
1 – 5
frontI’ll start by saying that resistance checks on ignition coils are a waste of time. I get this from people that actually design ignition coils for a living. The reason is that coils fail under load and a coil resistance can check out fine but it can actually be bad when under load. That said I’m also not a fan of ‘listening’ to injectors as this is also not conclusive. It CAN help find a dead injector but so can a power balance. That said I think you did a great job of finding the issue with the faulty coil. Thanks for using the ETCG forum and keeping us up to date.
- You must be logged in to reply to this topic.