1985 Ford Crown Victoria misfire

BILLY_BOB2003

MEMBER
1985 FORD CROWN VICTORIA
V8
2WD
AUTOMATIC
88,900 MILES

All right, I have an 85 crown vic 5.0 with the TFI IV universal distributor. I have a misfire on cylinder 2 and 3. Ive replaced plugs, wires, cap, rotor, hall effect unit, module, coil, timing dead on 10 BTDC, all the fusible links have been checked, voltage regulator, throttle position sensor, and solenoid new. I know for a fact that its just not getting good spark out of the distributor on those two cylinders. Motors been rebuilt so its nothing mechanical

5 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Engine misfiring can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.

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Monday, March 30th, 2009 AT 2:19 PM

BILLY_BOB2003

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2 POSTS

I know all that, my question is why is it misfiring if all of those are good. On the scope those two paticular cylinders arnt getting primary switching to the coil. So why is that

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Saturday, April 11th, 2009 AT 8:27 AM

RASMATAZ

MECHANIC
75,992 POSTS

You have not done what I suggested therefore since you know all of that you should be able to figure it out. Sorry! I'm not a magicman

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Saturday, April 11th, 2009 AT 9:32 AM

BILLY_BOB2004

MEMBER
2 POSTS

I said what ive done and you either told me to check what I had already replaced or checked. You also clearly didnt read what I said about the scope reading low spark output from the specific two cylinders meaning theres a problem with the ignition sytem DAAA. For what ever reason the pcm is telling the ignition moduel threw the spout wire to not switch on those two cylinders. This means that theres is a short to ground somewheres between the spout wire and the pip wire, or the pcm is fried. It turned out to be the pcm. If yall really new what yall were doing like us real mechanics then you would be able to figure it out

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Friday, April 23rd, 2010 AT 6:53 PM

THIS IS MIKE

MECHANIC
686 POSTS

Our technicians are real mechanics that are in here trying to help people. We do our best to provide good advice to find the probable causes and recommend a sound repair plan. We are sorry we were not able to help you figure it out your problem. We are glad to hear you were able to fix your car.